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Electromagnetic compatibi ity (EMC) –

Part 4-30: T esting and measurement techniques – Power qual ty measurement

methods

Partie 4-30: Techniques d’essai et de mesure – Méthodes de mesure de la qual té

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Electromagnetic compatibi ity (EMC) –

Part 4-30: Testing and measurement techniques – Power qual ty measurement

methods

Partie 4-30: T echniques d’essai et de mesure – Méthodes de mesure de la qual té

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CONTENTS

FOREWORD 7

INTRODUCTION 9

1 Sco e 10 2 Normative referen es 10 3 Terms an definition 11 4 General 16 4.1 Clas es of me s rement 16 4.2 Organization of the me s rements 17 4.3 Electrical values to b me s red 17 4.4 Me s rement ag regation over time intervals 17 4.5 Me s rement ag regation algorithm 18 4.5.1 Req irements 18 4.5.2 15 /18 -c cle ag regation 18 4.5.3 10-min ag regation 18 4.5.4 2-hour ag regation 2

4.6 Time-clock u certainty 21

4.7 Flag in con e t 21

5 Power q al ty p rameters 21

5.1 Power freq en y 21

5.1.1 Me s rement method 21

5.1.2 Me s rement u certainty an me s rin ran e 2

5.1.3 Me s rement evaluation 2

5.1.4 Ag regation 2

5.2 Mag itu e of the s p ly voltage 2

5.2.4 Ag regation 2

5.3 Flck r 2

5.3.4 Ag regation 2

5.4 Sup ly voltage dips an swel s 2

5.4.2 Detection an evaluation of a voltage dip 2

5.4.3 Detection an evaluation of a voltage swel 2

5.4.4 Calc lation of a sl din referen e voltage 2

5.5 Voltage inter uption 2

5.5.2 Evaluation of a voltage inter uption 2

5.5.4 Ag regation 2

5.6 Tran ient voltages 2

5.7 Sup ly voltage u b lan e 2

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5.7.4 Ag regation 2

5.8 Voltage harmonic 2

5.8.4 Ag regation 3

5.9 Voltage interharmonic 3

5.9.3 Evaluation 3

5.9 4 Ag regation 3

5.10 Main sig al n voltage on the s p ly voltage 31

5.10.1 General 31

5.10.4 Ag regation 31

5.1 Ra id voltage c an e (RVC) 31

5.1 1 General 31

5.1 2 RVC event detection 3

5.1 3 RVC event evaluation 3

5.1 4 Me s rement u certainty 3

5.12 Un erdeviation an overdeviation 3

5.13 Cur ent 3

5.13.1 General 3

5.13.2 Mag itu e of c r ent 3

5.13.3 Cur ent recordin 3

5.13.4 Harmonic c r ents 3

5.13.5 Interharmonic c r ents 3

5.13.6 Cur ent u b lan e 3

6 Performan e verification 3

An ex A (informative) Power q al ty me s rements – Is ues an g idel nes 3

A.1 General 3

A.2 In tal ation precaution 3

A.2.1 General 3

A.2.2 Test le d 3

A.2.3 Guardin of lve p rts 4

A.2.4 Monitor placement 4

A 2.5 Earthin 41

A.2.6 Interferen e 41

A.3 Tran d cers 41

A.3.1 General 41

A.3.2 Sig al levels 4

A.3.3 Freq en y resp n e of tran d cers 4

A.3.4 Tran d cers for me s rin tran ients 4

A.4 Tran ient voltages an c r ents 4

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A.4.1 General 4

A.4.2 Terms an definition 4

A.4.3 Freq en y an ampl tu e c aracteristic of a.c main tran ients 4

A.4.4 Tran ient voltage detection 4

A.4.5 Tran ient voltage evaluation 4

A.4.6 Efect of s rge protective devices on tran ient me s rements 4

A.5 Voltage dip c aracteristic 4

A.5.1 General 4

A.5.2 Ra idly updated r.m.s values 4

A.5.3 Phase an le/p int on-wave 4

A.5.4 Voltage dip u b lan e 4

A.5.5 Phase s if d rin voltage dip 4

A.5.6 Mis in voltage 4

A 5.7 Distortion d rin voltage dip 4

A.5.8 Other c aracteristic an referen es 4

An ex B (informative) Power q al ty me s rement – Guidan e for a pl cation 4

B.1 Contractual a pl cation of p wer q al ty me s rements 4

B.1.1 General 4

B.1.2 General con ideration 4

B.1.3 Sp cific con ideration 5

B.2 Statistical s rvey a plcation 5

B.2.1 General 5

B.2.2 Con ideration 5

B.2.3 Power q al ty in ices 5

B.2.4 Monitorin o jectives 5

B.2.5 Economic asp cts of p wer q al ty s rvey 5

B.3 L cation an typ s of s rvey 5

B.3.1 Monitorin location 5

B.3.2 Pre-monitorin site s rvey 5

B.3.3 Cu tomer side site s rvey 5

B.3.4 Network side s rvey 5

B.4 Con ection an q antities to me s re 5

B.4.1 Eq ipment con ection o tion 5

B.4.2 Priorities: Quantities to me s re 5

B.4.3 Cur ent monitorin 5

B.5 Selectin the monitorin thres old an monitorin p riod 5

B.5.1 Monitorin thres old 5

B.5.2 Monitorin period 5

B.6 Statistical analy is of the me s red data 5

B.6.1 General 5

B.6.2 In ices 5

B.7 Trouble-s o tin a plcation 5

B.7.1 General 5

B.7.2 Power q al ty sig atures 5

An ex C (informative) Con u ted emis ion in the 2 kHz to 15 kHz ran e 61

C.1 General 61

C.2 Me s rement method – 2 kHz to 9 kHz 61

C.3 Me s rement method – 9 Hz to 15 kHz 6

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C.4 Me s rement ran e an me s rement u certainty 63

C.5 Ag regation 63

An ex D (informative) Un erdeviation an overdeviation 6

D.1 General 6

D.2 Me s rement method 6

D.3 Me s rement u certainty an me s rin ran e 64 D.4 Ag regation 64 An ex E (informative) Clas B Me s rement Method 6

E.1 Backgrou d for Clas B 6

E.2 Clas B – Me s rement ag regation over time intervals 6

E.3 Clas B – Me s rement ag regation algorithm 6

E.4 Clas B – Re l time clock (RTC) u certainty 6

E.4.1 General 6

E.4.2 Clas B – Freq en y – Me s rement method 6

E.4.3 Clas B – Freq en y – Me s rement u certainty 6

E.4.4 Clas B – Freq en y – Me s rement evaluation 6

E.4.5 Clas B – Mag itu e of the s p ly – Me s rement method 6

E.4.6 Clas B – Mag itu e of the s p ly – Me s rement u certainty an me s rin ran e 6

E.5 Clas B – Fl ck r 67 E.5.1 General 6

E.5.2 Clas B – Sup ly voltage dips an swel s – Me s rement method 6

E.6 Clas B – Voltage inter uption 6

E.6.1 General 6

E.6.2 Clas B – Sup ly voltage u b lan e – Me s rement method 6

E.6.3 Clas B – Sup ly voltage u b lan e –Un ertainty 6

E.6.4 Clas B – Voltage harmonic – Me s rement method 6

E.6.5 Clas B –Voltage harmonic – Me s rement u certainty an ran e 6

E.6.6 Clas B – Voltage interharmonic – Me s rement method 6

E.6.7 Clas B –Voltage interharmonic – Me s rement u certainty an ran e 6

E.6.8 Clas B – Main sig al n voltage – Me s rement method 6

E.6.9 Clas B –Main sig al n voltage – Me s rement u certainty an ran e 6

E.6.10 Clas B – Cur ent – Me s rement method 6

E.6.1 Clas B – Cur ent – Me s rement u certainty an ran e 6

Bibl ogra h 6

Fig re 1 – Me s rement c ain 17 Fig re 2 – Sy c ronization of ag regation intervals for Clas A 19 Fig re 3 – Sy c ronization of ag regation intervals for Clas S: p rameters for whic ga s are not p rmited 2

Fig re 4 – Sy c ronization of ag regation intervals for Clas S: p rameters for whic ga s are p rmit ed (se 4.5.2) 2

Fig re 5 – Example of s p ly voltage u b lan e u certainty 2

Fig re 6 – RVC event: example of a c an e in r.m.s voltage that res lts in an RVC event 3

Fig re 7 – Not an RVC event: example of a c an e in r.m.s voltage that do s not res lt in an RVC event b cau e the dip thres old is ex e ded 3

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Fig re A.1 – Freq en y sp ctrum of typical re resentative tran ient test waveforms 4

Ta le 1 – Summary of req irements (se s bclau es for actual req irements) 3

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INTERNATIONAL ELECTROTECHNICAL COMMISSION

1) Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org nizatio for sta d rdizatio c mprisin

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in th su je t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n

n-g v rnme tal org nizatio s laisin with th IEC also p rticip te in this pre aratio IEC c la orates closely

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2) Th formal d cisio s or a re me ts of IEC o te h ic l maters e pres , as n arly as p s ible, a

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from al intereste IEC Natio al Commite s

3) IEC Pu lc tio s h v th form of re omme d tio s for intern tio al use a d are a c pte b IEC Natio al

Commite s in th t se se Whie al re so a le eforts are ma e to e sure th t th te h ic l c nte t of IEC

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th later

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servic s c rie o t b in e e d nt c rtific tio b dies

6) Al users sh uld e sure th t th y h v th latest e itio of this p blc tio

7) No la i ty sh l ata h to IEC or its dire tors, emplo e s, serv nts or a e ts in lu in in ivid al e p rts a d

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e p nses arisin o t of th p blc tio , use of, or rela c u o , this IEC Pu lc tio or a y oth r IEC

Pu lc tio s

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p te t rig ts IEC sh l n t b h ld resp nsible for id ntifyin a y or al su h p te t rig ts

International Stan ard IEC 610 0-4-3 has b en pre ared by s bcommit e 7 A: EMC –

L w- freq en y phenomena, of IEC tec nical commite 7 : Electromag etic comp tibi ty

This stan ard forms p rt 4-3 of IEC 610 0 It has the statu of a b sic EMC publcation in

ac ordan e with IEC Guide 10

This third edition can els an re laces the secon edition publs ed in 2 0 This edition

con titutes a tec nical revision

This edition in lu es the fol owin sig ificant tec nical c an es with resp ct to the previou

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c) the me s rement method for con u ted emis ion in the 2 kHz to 15 kHz ran e has

b en ad ed in informative An ex C;

d) u derdeviation an overdeviation p rameters are moved to informative An ex D;

e) Clas A an Clas S me s rement method are defined an clarified, whie Clas B is

moved to informative An ex E an con idered for future removal;

f me s rement method contin e in this stan ard, but resp n ibi ty for influen e q antities,

p rforman e, an test proced res are tran fer ed to IEC 6 5 6-2

The text of this stan ard is b sed on the fol owin doc ments:

Ful information on the votin for the a proval of this stan ard can b fou d in the re ort on

votin in icated in the a ove ta le

This publ cation has b en draf ed in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 610 0 series, publ s ed u der the general title Electromagnetc

comp tb il y (EMC), can b fou d on the IEC we site

The commit e has decided that the contents of this publ cation wi remain u c an ed u ti

the sta i ty date in icated on the IEC we site u der "ht p:/we store.iec.c " in the data

related to the sp cific publcation At this date, the publcation wi b

• reconfirmed,

• with rawn,

• re laced by a revised edition, or

IMPORTANT – Th 'colour in ide' logo on the cov r pa e of this publ c tion in ic te

that it contains colours whic are con idere to be us ful for th cor e t

understa ding of its conte ts Us rs s ould th refore print this doc me t using a

colour printer

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Mitigation method an devices

Part 6: Ge eric sta dards

Part 9: Mis el a eous

Eac p rt is further s bdivided into several p rts, publ s ed either as International Stan ard

or as Tec nical Sp cification or Tec nical Re orts, some of whic have alre d b en

publ s ed as section Others wi b publ s ed with the p rt n mb r fol owed by a das an

completed by a secon n mb r identifyin the s bdivision (example: 610 0-6-1)

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ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-30: Testing and measurement techniques –

Power qual ty measurement methods

This p rt of IEC 610 0-4 defines the method for me s rement an interpretation of res lts

for p wer q al ty p rameters in a.c p wer s p ly s stems with a declared fu damental

freq en y of 5 Hz or 6 Hz

Me s rement method are des rib d for e c relevant p rameter in terms that give rel a le

an re e ta le res lts, regardles of the method’s implementation This stan ard ad res es

me s rement method for in-situ me s rements

Me s rement of p rameters covered by this stan ard is l mited to con u ted phenomena in

p wer s stems The p wer q al ty p rameters con idered in this stan ard are power

freq en y, mag itu e of the s p ly voltage, fl ck r, s p ly voltage dips an swel s, voltage

inter uption , tran ient voltages, s p ly voltage u b lan e, voltage harmonic an

interharmonic , main sig al n on the s p ly voltage, ra id voltage c an es, an c r ent

me s rements Emis ion in the 2 kHz to 15 kHz ran e are con idered in An ex C

(informative), an over- an u derdeviation are con idered in An ex D (informative)

De en in on the purp se of the me s rement, al or a s bset of the phenomena on this l st

may b me s red

NOT 1 Test meth ds for v rifyin c mpla c with this sta d rd c n b fo n in IEC 6 5 6-2

NOT 2 Th efe ts of tra sd c rs inserte b twe n th p wer system a d th instrume t are a k owle g d b t

n t a dres e in d tai in this sta d rd Guid n e a o t efe ts of tra sd c rs c n b fo n IEC TR 618 9-10

2 Normative reference

The fol owin doc ments, in whole or in p rt, are normatively referen ed in this doc ment

an are in isp n a le for its a pl cation For dated referen es, only the edition cited a pl es

For u dated referen es, the latest edition of the referen ed doc ment (in lu ing an

amen ments) a pl es

IEC 6 0 0 (al p rts), Intern to al Electrotech ical Vocab u lary (IEV) (avaia le at

www.electro edia.org)

IEC 610 0-2-4, Electromagnetc comp tb il y (EMC) – Part 2-4: En iro me t – Comp tb il y

le els in industrialp la ts forlow-fre u ency co du cted distu rb ances

IEC 610 0-3-8, Electromagnetc comp tb il y (EMC) – Part 3: Limis – Secto 8: Signal n

electromagnetc distu rb ance le els

IEC 610 0-4-7:2 0 , Electromagnetc comp tb il y (EMC) – Part 4-7: Testn a d me su

re-me t tech iqu es – G en ral gu ide o h rmo ic a d interh rmo ic me su reme ts a d

IEC 610 0-4-7:2 0 /AMD1:2 0

IEC 610 0-4-15:2 10, Electromagnetc comp tb il y (EMC) – Part 4-15: Testn a d

me su reme t tech iques – Flck rmeter – Fu ncto al a ddesign sp cificato s

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IEC 61 8 (al p rts), High-v lage test tech iqu es for low v lage e u ipme t

IEC 6 5 6-1, Power qu al y me sureme t in p wer su pp ly systems – Part 1: Power qual y

instrume ts (PQI

IEC 6 5 6-2, Powerqu al y me su reme t in p wersu pp ly systems – Part 2: Functo al tests

a d u ncertainty re u ireme ts

3 Terms and definitions

For the purp ses of this doc ment, the terms an definition given in IEC 6 0 0-161, as wel

as the fol owin a ply

3.1

c a nel

in ivid al me s rement p th throu h an in trument

Note 1 to e try: “Ch n el” a d “p ase” are n t th same A v lta e c a n l is b d finitio th difere c in

p te tial b twe n 2 c n u tors Ph se refers to a sin le c n u tor On p ly h se systems, a c a n l ma b

b twe n 2 p ases, or b twe n a p ase a d n utral or b twe n a p ase a d e rth, or b twe n n utral a de rth

Note 1 to e try: If b a re me t b twe n th su pler a d th c stomer a v lta e difere t from th n min l

v lta e is a ple to th termin ls, th n this v lta e is th d clare su ply v lta e U

for an me s rement time interval in whic inter uption , dips or swel s oc ur, the mark d

me s rement res lts of al other p rameters made d rin this time interval

Note 1 to e try: For some a plc tio s, this ‘mark d’ or ‘fla g d’ d ta ma b e clu e from furth r a alysis, for

e ample Se 4.7for furth r e pla atio

3.6

fl c er

impres ion of u ste dines of vis al sen ation in u ed by a l g t stimulu whose luminan e

or sp ctral distribution flu tuates with time

Trang 14

fun ame tal compone t

comp nent whose freq en y is the fu damental freq en y

3.8

fun ame tal fre ue c

freq en y in the sp ctrum o tained from a Fourier tran form of a time fu ction, to whic al

the freq en ies of the sp ctrum are refer ed

Note 1 to e try: In c se of a y remainin risk of ambig ity, th fu d me tal fre u n y ma b d riv d from th

n mb r of p les a d sp e of rotatio of th sy c ro o s g n rator(s)fe din th system

3.9

harmonic compone t

an of the components havin a harmonic freq en y

Note 1 to e try: Its v lu is n rmaly e pres e as a r.m.s v lu For bre ity, su h c mp n nt ma b refere

to simply as a h rmo ic

[SOURCE: IEC 610 0-2-2:2 0 , 3.2.4,

3.10

harmonic fre u nc

freq en y whic is an integer multiple of the fu damental freq en y

Note 1 to e try: Th ratio of th h rmo ic fre u n y to th fu d me tal fre u n y is th h rmo ic ord r

(re omme d d n tatio : n) (IEC 610 0-2-2:2 0 , 3.2.3)

3.1

hy tere is

dif eren e in mag itu e b twe n the start an en thres old

Note 1 to e try: This d finitio of h steresis is rele a t to PQ me sureme t p rameters a d is difere t from th

IEC 6 0 0d finitio whic is rele a t to iro c re saturatio

Note 2 to e try: Th p rp se of h steresis in th c nte t of PQ me sureme ts is to a oid c u tin multiple

e e ts wh n th ma nitu e of th p rameter osci ates a o t th thresh ld le el

3.12

influe c q a tity

q antity whic is not the s bject of the me s rement an whose c an e afects the

relation hip b twe n the in ication an the res lt of the me s rement

[SOURCE: IEC 6 0 0-31 :2 01, 31 -0 -01]

3.13

interharmonic compone t

sp ctral comp nent with a freq en y b twe n two con ec tive harmonic freq en ies

Note 1 to e try: Th d finitio is d riv d fromIEC 610 0-4-7

Note 2 to e try: Its v lu is n rmaly e pres e as a r.m.s v lu For bre ity, su h a c mp n nt ma b refere

to simply as a interh rmo ic

Trang 15

3.14

interharmonic fre ue c

an freq en y whic is not an integer multiple of the fu damental freq en y

Note 1 to e try: By e te sio from th h rmo ic ord r, th interh rmo ic ord r is th ratio of a interh rmo ic

fre u n y to th fu d me tal fre u n y This ratio isn t a inte er (re omme d d n tatio m)

Note 2 to e try: In th c se wh re m < 1 th term su h rmo ic fre u n y ma b use

inter uption thre hold

voltage mag itu e sp cified for the purp se of detectin the start an the en of a voltage

inter uption

3.17

me s reme t un ertainty

p rameter, as ociated with the res lt of a me s rement, that c aracterizes the disp rsion of

the values that could re sona ly b at ributed to the me s ran

dif eren e b twe n the me s red value an the nominal value of a p rameter, only when the

me s red value of the p rameter is gre ter than the nominal value

3.2

power qual ty

c aracteristic of the electricity at a given p int on an electrical s stem, evaluated again t a

set of referen e tec nical p rameters

Note 1 to e try: Th se p rameters mig t, in some c ses, relate to th c mp tibi ty b twe n ele tricity su ple

Trang 16

times o difere t c a n ls for p ly h se systems.

Note 2 to e try: This v lu is use o ly for v lta e dip, v lta e swel inter u tio , a d R C d te tio a d

value of the r.m.s c r ent me s red over 1 c cle, commen in at a fu damental zero

cros in on an as ociated voltage c an el, an refres ed e c half c cle

Note 1 to e try: For g id n e, th as o iate v lta e c a n l mig t b th c resp n in p ase- o-n utral

c a n l o sin le-p ase or star n tworks If th re is n c resp n in v lta e c a n l for e ample o d lta

n twork c re ts, or e rth c re t or n utral c re t me sureme ts, th n th refere c c a n l (se 5.1.3) use

for fre u n y me sureme ts mig t b use

3.2

r.m.s volta e refre he e c c cle

U

rms(1)

value of the r.m.s voltage me s red over 1 c cle an refres ed e c c cle

Note 1 to e try: In c ntrast to U

rms(½), this te h iq e d es n t d fin wh n a c cle c mme c s

Note 2 to e try: This v lu is use o ly in Clas S, a d is use for v lta e dip, v lta e swel a d interu tio

a q ick tran ition in r.m.s voltage oc ur in b twe n two ste d -state con ition , an d rin

whic the r.m.s voltage do s not ex e d the dip/swel thres old

Note 1 to e try: This n te a ples to th Fre c la g a e o ly

Note 1 to e try: Th resid al v lta e is e pres e as a v lu in v lts, or as a p rc nta e or p r u it v lu of th

Trang 17

Note 2 to e try: Th sldin refere c v lta e ma b use to d termin th v lta e c a g d rin a dip or a

swel ty ic ly for me ium-v lta e or hig -v lta e systems

combination of several seq ential values of a given parameter (e c determined over

identical time intervals) to provide a value for a lon er time interval

Note 1 to e try: Ag re atio in this d c me t alwa s refers to timea gre atio

3.3

underde iation

a solute value of the dif eren e b twe n the me s red value an the nominal value of a

p rameter, only when the value of the p rameter is lower than the nominal value

3.3

UTC

coordinate univ rs l time

time s ale whic forms the b sis of a co rdinated radio dis emination of stan ard

freq en ies an time sig als whic cor esp n s exactly in rate with international atomic time,

but difers from it by an integral n mb r of secon s

Note 1 to e try: Co rdin te u iv rsal time is esta lsh d b th Intern tio al Bure u of Weig ts a d Me sures

(BIPM) a d th Intern tio al Earth Rotatio Servic (IERS)

Note 2 to e try: Th UTC sc le is a juste b th insertio or d letio of se o ds, so c le p sitiv or n g tiv

le p se o ds, to e sure a pro imate a re me t with UT1

Note 3 to e try: This n te a ples to th Fre c la g a e o ly

[SOURCE: Recommen ation ITU-R RF.6 6.3]

3.3

volta e dip

temp rary red ction of the voltage mag itu e at a p int in the electrical s stem b low a

thres old

Note 1 to e try: Interu tio s are a sp cial c se of a v lta e dip Postpro es in ma b use to distin uish

b twe n v lta e dips a d interu tio s

Note 2 to e try: A v lta e dip is also refere to as sa Th two terms are c nsid re interc a g a le; h we er,

this sta d rd wi o ly use th term v lta e dip

con ition in a p lyphase s stem in whic the r.m.s values of the l ne voltages ( u damental

comp nent , an /or the phase an les b twe n con ec tive l ne voltages, are not al eq al

Note 1 to e try: Th d gre of th in q alty is usu ly e pres e as th ratios of th n g tiv - a d z

ero-se u n e c mp n nts to th p sitiv -se u n e c mp n nt

Note 2 to e try: In this sta d rd, v lta e u b la c is c nsid re in relatio to 3-p ase systems

Trang 18

[SOURCE: IEC 6 0 0-161:2 0 , 161-0 -0 , modified – notes to entry have b en ad ed]

4.1 Cla s s of me s reme t

For e c p rameter me s red, two clas es, A an S, are defined in this stan ard For e c

clas , me s rement method an a pro riate p rforman e req irements are in lu ed

– Cla s A

This clas is u ed where precise me s rements are neces ary, for example, for

contractual a pl cation that may req ire resolvin disputes, verifyin compl an e with

stan ard , etc An me s rements of a p rameter car ied out with two diferent

in truments complyin with the req irements of Clas A, when me s rin the same

sig als, wi prod ce matc in res lts within the sp cified u certainty for that p rameter

NOT 1 Clas A me sureme ts pro u e matc in results o ly if th user-sele te p rameters ( hresh lds,

h steresis, etc.) matc

– Cla s S

This clas is u ed for statistical a pl cation s c as s rvey or p wer q al ty as es ment,

p s ibly with a l mited s bset of p rameters Althou h it u es eq ivalent intervals of

me s rement as Clas A, the Clas S proces in req irements are mu h lower Some

s rvey may as es p wer q al ty p rameters of several me s rement sites on a network;

other s rvey as es p wer q al ty p rameters at a sin le site over a p riod of time, or at

location within a bui din or even within a sin le large piece of eq ipment

– Cla s B

For Clas B information, se An ex E (informative) of this stan ard Clas B method

s al not b employed for new in truments Clas B is moved to An ex E on the b sis that

al new in trument desig s wi comply with either Clas A or Clas S Clas B may b

relevant for legac in truments that are sti in u e Clas B may b removed in the next

edition of this stan ard

NOT 2 Clas B me sureme t meth ds wi pro id useful b t n t n c s ariy c mp ra le informatio Clas

B was intro u e in IEC 610 0-4-3 :2 0 (e itio 1) sp cific ly to a oid ma in old r instrume t d sig s

o solete IEC 610 0-4-3 :2 0 (e itio 2) warn d th t Clas B ma b remo e in a future e itio of this

sta d rd IEC 610 0-4-3 :– (his e itio 3) warns a ain th t Clas B ma b remo e in a future e itio , a d

mo es Clas B to Informativ An e E

NOT 3 Inthis sta d rd, “A” sta ds for “Ad a c d”, a d “S” sta ds for “Surv ys”

Users s al select the clas that they req ire, b sed on their a pl cation(s) For

troubles o tin a pl cation , de en in on the typ of pro lem either Clas A or Clas S

method may b selected by the u er

The in trument man facturer s ould declare influen e q antities whic are not expres ly

given an whic may degrade p rforman e of the in trument

An in trument may me s re some or al of the p rameters identified in this stan ard, an

prefera ly u es the same clas for al p rameters For g idan e, se IEC 6 5 6-1 an

IEC 6 5 6-2

The in trument man facturer s al declare whic p rameters are me s red, whic clas is

u ed for e c p rameter, the ran e of U

dinfor whic e c clas is fulfi ed, an al the

neces ary req irements an ac es ories (s n hronization, pro es, cal bration p riod,

temp rature ran es, etc.) to me t e c clas

Trang 19

4.2 Orga ization of the me s reme ts

The electrical q antity to b me s red may b either directly ac es ible, as is general y the

case in low-voltage s stems, or ac es ible via me s rement tran d cers

The whole me s rement c ain is s own in Fig re 1

Figure 1 – Me s reme t c ain

An "in trument" may in lu e the whole me s rement c ain (se Fig re 1) In this stan ard,

the normative p rt do s not con ider an p s ible me s rement tran d cers external to the

in trument an their as ociated u certainty, but Clau e A.2 gives g idan e

4.3 Ele tric l v lue to be me s re

Me s rements can b p rformed on sin le-phase or p lyphase s p ly s stems De en in

on the context, it may b neces ary to me s re voltages b twe n phase con u tors an

neutral (lne- o-neutral) or b twe n phase con u tors (l ne- o-l ne) or b twe n phase

con u tors or neutral an e rth (phase- o-e rth, neutral- o-e rth) It is not the purp se of this

stan ard to imp se the c oice of the electrical values to b me s red More ver, ex ept for

the me s rement of voltage u b lan e, whic is intrin ical y p lyphase, the me s rement

method sp cified in this doc ment are s c that in e en ent res lts can b prod ced on

e c me s rement c an el

NOT Ph se- o-p ase insta ta e us v lu s c n b me sure dire tly, or c n b d riv d from insta ta e us

p ase- o-n utral me sure v lu s or from p ase- o-e rth me sure v lu s

Cur ent me s rements may be p rformed on e c cond ctor of s p ly s stems, in lu in the

neutral con u tor an the protective e rth con u tor (se 5.13)

4.4 Me s reme t a gre ation ov r time interv ls

– Cla s A

The b sic me s rement time interval for p rameter mag itu es (s p ly voltage,

harmonic , interharmonic an u b lan e) s al b a 10-c cle time interval for a 5 Hz

p wer s stem or a 12-c cle time interval for a 6 Hz p wer s stem

The 10/12-c cle me s rement s al b re-s n hronized at every UTC (co rdinated

u iversal time) 10-min tick Se Fig re 2

NOT 1 Th u c rtainty of this me sureme t is in lu e in th u c rtainty me sureme t proto ol of e c

p rameter

The 10/12-c cle values are then ag regated over 3 ad itional intervals:

• 15 /18 -c cle interval (15 c cles for 5 Hz nominal or 18 c cles for 6 Hz nominal),

• 10-min interval,

• 2-hour interval for P

lt

fl ck r

NOT 2 A 2-h ur a gre atio interv l is o tio al for al p rameters, with th e c ptio of flc er

me sureme ts whic re uire a 2-h ur a gre atio interv l for P

ltThis 2-h ur a gre atio interv l ma

Trang 20

15 /18 -c cle time interval also contin es u ti it is completed This may cre te an

overla b twe n these two 15 /18 -c cle intervals (overla 2 in Fig re 2)

– Cla s S

The data for the 15 /18 -c cle time interval s al b ag regated from 10/12-c cle time

intervals Res n hronization with the UTC 10-min tick is p rmited but not man atory

(Se Fig re 3.)

Ga s are p rmit ed but not man atory for harmonic , interharmonic , main sig al n

voltage an u b lan e A minimum of thre 10/12-c cle values s al b u ed e c

15 /18 -c cle time interval, i.e at le st one 10/12-c cle value s al b u ed e c

5 /6 c cles (se Fig re 4) For al other p rameters, the data for the 15 /18 -c cle time

interval s al b ag regated without ga from fif e n 10/12-c cle time intervals

4.5.3 10-min a gre ation

– Cla s A

The 10-min ag regated value s al b tag ed with the UTC time ( or example,

01H10.0 ,0 0) at the con lu ion of the 10-min ag regation interval, rou ded to the

ne rest secon

NOT In some circ msta c s, it c n b useful to use lo al time, whic c n difer from UTC b a fix d ofset,

or a ofset th t c n v ry b se o time of y ar This ty e of time stamp ofe in lu es b th a time a d a d te

This ty e of time stamp c n b refere to as “a solute time”

The data for the 10-min time interval s al b ag regated from 10/12-c cle time intervals

Eac 10-min te interval s al begin on a UTC 10-min tick The 10-min tick is also u ed to

re-s n hronize the 10/12-c cle intervals an the 15 /18 -c cle intervals Se Fig re 2

The final 10/12-c cle interval(s) in a 10-min ag regation p riod wi typical y overla in

time with the UTC 10-min clock tick An overla pin 10/12-c cle interval (overla 1 in

Fig re 2) is in lu ed in the ag regation of the previou 10-min interval

Trang 21

Figure 2 – Sy c ronization of a gre ation interv ls for Cla s A

– Cla s S

The 10-min ag regation method u ed for Clas S s al b either the Clas A method, or

the fol owin simpl fied method:

The data for the 10-min time interval s al b ag regated from 10/12-c cle time intervals

There is no res n hronization on the UTC 10-min tick The 10-min intervals are fre

ru nin

The 10-min ag regated value s al b tag ed with the time at the con lu ion of the 1

0-min ag regation interval (e.g 01h10.0 ,04 )

There wi b no overla , as i u trated in Fig re 3 an Fig re 4

Trang 22

Figure 3 – Sy c ronization of a gre ation interv ls for Cla s S:

parameters for whic gaps are not permit e

Figure 4 – Sy c ronization of a gre ation interv ls for Cla s S:

parameters for whic gaps are permit e (s e 4.5.2)

15 /18 -c cle time inter val (n )

10-min inter val (x)

15 /18 -c cle time inter val (n 1)

Trang 23

4.6 Time-cloc u c rtainty

Time-clock u certainty is defined relative to co rdinated u iversal time (UTC), whic is

contin ou ly in rementin an avai a le world-wide

NOT 1 Th time clo k ma mo e forward or b c ward u d r c rtain circ msta c s, su h as d ylg t sa in s

time, e tern l sy c ro izatio u d tes, etc Wh n th clo k mo es forward in time, th re ma b g ps in th d ta

Wh n th clo k mo es b c wards in time, d ta ma o erla in time

– Cla s A

The time-clock u certainty s al not ex e d ± 0 ms for 5 Hz or ±16,7 ms for 6 Hz,

regardles of the total time interval

NOT 2 This p rforma c c n b a hie e , for e ample, thro g a sy c ro izatio pro e ure a ple

p rio ic ly d rin a me sureme t c mp ig , thro g a GP re eiv r, or thro g re e tio of tra smite

ra iotimin sig als or b usin n twork timin sig als

When s n hronization by an external sig al b comes u avai a le, the time tag in

toleran e s al b b ter than ±1 s p r 2 -h p riod; however, this ex e tion do s not

el minate the req irement for compl an e with the first p rt of this p ragra h

NOT 3 This p rforma c is n c s ary to e sure th t two instrume ts usin Clas A meth ds pro u e th

same 10-min a gre atio results wh n c n e te to th same sig al

– Cla s S

The time-clock u certainty s al not ex e d ± s p r 2 -h p riod

4.7 Fla ging conc pt

Durin a dip, swel , or inter uption, the me s rement algorithm for other p rameters ( or

example, freq en y me s rement mig t prod ce an u rel a le value The flag in con e t

avoid cou tin a sin le event more than on e in dif erent p rameters ( or example, cou tin

a sin le dip as b th a dip an a freq en y variation), an in icates that an ag regated value

mig t b u rel a le

Flag in is only trig ered by dips, swel s, an inter uption The detection of dips an swel s

is de en ent on the thres old selected by the u er, an this selection wi influen e whic

data are "flag ed"

The flag in con e t is a plca le for Clas A an Clas S d rin me s rement of p wer

freq en y, voltage mag itu e, fl ck r, s p ly voltage u b lan e, voltage harmonic , voltage

interharmonic , main sig al n an me s rement of u derdeviation an overdeviation

p rameters

If d rin a given time interval an value is flag ed, the ag regated value whic in lu es that

value s al also b flagged The flag ed value s al b stored an also in lu ed in the

ag regation proces For example, if d rin a given time interval an value is flag ed, then

the ag regated value that in lu es this value s al also b flag ed an stored

NOT 1 Informatio a o t oth r ty es of fla gin , or d ta markin , c n b fo n in IEC 6 5 6-1

NOT 2 Th user c n d cid h wto e alu te fla g d d ta

5 Power qual ty parameters

5.1.1 Me s reme t method

– Cla s A

The freq en y re din s al b o tained every 10 s As p wer freq en y may not b

exactly 5 Hz or 6 Hz within the 10-s time clock interval, the n mb r of c cles may not

Trang 24

b an integer n mb r The fu damental freq en y output is the ratio of the n mb r of

integral c cles cou ted d rin the 10-s time clock interval, divided by the c mulative

d ration of the integer c cles

When a zero cros in method is u ed for freq en y calc lation, then, b fore the

as es ment, harmonic an interharmonic s al b at en ated to minimize the efects of

multiple zero cros in s

The me s rement time intervals s al b non-overla pin In ivid al c cles that overla

the 10-s time clock are dis arded Eac 10-s interval s al b gin on an a solute 10-s time

clock, with u certainty as defined in 4.6

Other tec niq es that provide eq ivalent res lts, s c as con olution, are ac e ta le

NOT For some a plc tio s, th use of time interv ls sh rter th n 10 s ma p s ibly b useful su h as

10/12 c cles (win turbin s), 1 s (n tio al sta d rds), etc

The freq en y me s rement s al b made on the referen e c an el

The man facturer s al sp cify the b haviour of freq en y me s rement whenever the

referen e c an el loses voltage

The me s rement s al b the r.m.s value of the voltage mag itu e over a 10-c cle time

interval for a 5 Hz p wer s stem or a 12-c cle time interval for a 6 Hz p wer s stem

Every 10/12-c cle interval s al b contig ou , an not overla pin with adjacent 10/1

2-c cle intervals ex e t as s own in overla 1 in Fig re 2

NOT 1 This sp cific me sureme t meth d is use for q asi-statio ary sig als a d is n t use for th

d te tio a d me sureme t of disturb n es: dips, swels, v lta e inter u tio s a d tra sie ts

NOT 2 Th r.m.s v lu in lu es, b d finitio , h rmo ics, interh rmo ics, mains sig al n , etc

– Cla s S

Same as Clas A

5.2.2 Me s reme t un ertainty a d me s rin ra ge

– Cla s A

Trang 25

Un er the con ition des rib d in Clau e 6, the me s rement u certainty s al not

ex e d ± ,1 % of U

din, over the ran e of 10 % to 15 % of U

tag ed with the time at the con lu ion of the interval (se 4.5.3)

Voltage dips, swels, an inter uption s al cau e P

Trang 26

5.4 Supply volta e dips a d swel s

determined by the last non- lag ed p wer freq en y me s rement (se 4.7 an 5.1), or

by an other method that yield the u certainty req irements of Clau e 6

rms(½)

v lu in lu es,b d finitio , h rmo ics, interh rmo ics, mains sig al n v lta e, etc

NOT 2 It is imp rta t to a oid los of d ta wh n dips a d swels o c r in a ra id se u n e ( or e ample,

thre e e ts in o e se o d, with u to o e min te b twe n se u n es, c uld p s ibly o c r wh n a re loser

o erates into a sustain d fa lt If, d rin a ra id b rst, th dip/swel e e t c ara teristics c n ot b re ord d,

v lu in lu es, b d finitio , h rmo ics, interh rmo ics, mains sig al n v lta e, etc

5.4.2 Dete tion a d e aluation of a volta e dip

5.4.4) The u er s al declare the referen e voltage in u e

NOT Th sldin v lta e refere c U

sr

is g n raly n t use in LV systems Se IEC TR 610 0-2-8 for furth r

informatio a d a vic

– On sin le-phase s stems a voltage dip b gin when the U

rms voltage fal s b low the dip

thres old, an en s when the U

rmsvoltage is eq al to or a ove the dip thres old plu the

h steresis voltage

– On p lyphase s stems a dip b gin when the U

rmsvoltage of one or more c an els is

b low the dip thres old an en s when the U

rmsvoltage on al me s red c an els is

eq al to or a ove the dip thres old plu the h steresis voltage

The dip thres old an the h steresis voltage are b th set by the u er ac ordin to the

a pl cation

5.4.2.2 Volta e dip e aluation

A voltage dip is c aracterized by a p ir of data, either resid al voltage (U

res) or de th, an

resid al voltage It is generaly expres ed in p rcentage of the referen e voltage

NOT 1 Durin th dip it ma b useful to also re ord th lowest U

rms(½)

o e c c a n l in a ditio to th

resid al v lta e of th dip Th d ratio sp nt b low th dip thresh ld o e c c a n l ma also b useful

NOT 2 If v lta e wa eforms are re ord d b fore, d rin , a d afer a dip, useful informatio a o t p ase

Trang 27

NOT 4 Volta e dip e v lo es are n t n c s ariy re ta g lar As a c nse u n e, for a giv n v lta e dip, th

me sure d ratio is d p n e t o th sele te dip thresh ld v lu Th sh p of th e v lo e c n b as es e

usin se eral dip thresh lds set within th ra g of v lta e dip a d v lta e interu tio thresh lds

NOT 5 Ty ic ly, th h steresis is e u l to2 % of U

din

NOT 6 Dip thresh lds are ty ic ly in th ra g 8 % to 9 % of th fix d v lta e refere c for tro blesh otin

or statistic l a plc tio s

NOT 7 Resid al v lta e is ofe useful to e d-users, a d c n b prefer e b c use it is refere c d to zero v lts

In c ntrast, d pth is ofe useful to ele tric su plers, esp cialy o H systems or in c ses wh n a sldin

refere c v lta e is use

NOT 8 Ph se shif c n o c r d rin v lta e dips Se A.5.5

NOT 9 Wh n a thresh ld is cros e , a time stamp c n b re ord d

5.4.3 Dete tion a d e aluation of a volta e swel

5.4.4) The u er s al declare the referen e voltage in u e

NOT Sldin refere c v lta e U

s

is g n raly n t use in LV systems Se IEC TR 610 0-2-8 for furth r

informatio a d a vic

– On sin le-phase s stems a swel b gin when the U

rmsvoltage rises a ove the swel

thres old, an en s when the U

rmsvoltage is eq al to or b low the swel thres old min s

the h steresis voltage

– On p lyphase s stems a swel b gin when the U

rms

voltage of one or more c an els is

a ove the swel thres old an en s when the U

rmsvoltage on al me s red c an els is

eq al to or b low the swel thres old min s the h steresis voltage

The swel thres old an the h steresis voltage are b th set by the u er ac ordin to the

a pl cation

5.4.3.2 Volta e swel e aluation

A voltage swel is c aracterized by a p ir of data: maximum swel voltage mag itu e an

NOT 2 Volta e swel e v lo e ma p s ibly n t b re ta g lar As a c nse u n e, for a giv n swel th

me sure d ratio is d p n e t o th swel thresh ld v lu

Trang 28

NOT 4 Ty ic ly, th swel thresh ld isgre ter th n1 0 %of U

din

NOT 5 Ph se shif c n also o c r d rin v lta e swels

NOT 6 Wh n a thresh ld is cros e , a time stamp c n b re ord d

5.4.4 Calc lation of a sl ding refere c volta e

The sl din referen e voltage implementation is o tional, not man atory If a sldin referen e

is c osen for voltage dip or swel detection, this s al b calc lated u in a first order fi ter

with a 1-min time con tant This fi ter is given by

U

sr(n)

= 0,9 6 × U

sr(n–1)+ 0,0 3 × U

When the me s rement is started, the initial value of the sl din referen e voltage is set to

the declared input voltage The sl din referen e voltage is updated every 10/12 c cles If a

10/12-c cle value is flag ed, the sl din referen e voltage is not updated an the previou

– Cla s S

The me s rement u certainty s al not ex e d ±1,0 % of U

din

5.4.5.2 Duration me s reme t unc rtainty

– Cla s A

The u certainty of a dip or swel d ration is eq al to the dip or swel commen ement

u certainty (half a c cle) plu the dip or swel con lu ion u certainty (half a c cle)

– Cla s S

If U

rms(½)

is u ed, then the u certainty of a dip or swel d ration is eq al to the dip or

swel commen ement u certainty (half a c cle) plu the dip or swel con lu ion

u certainty (half a c cle) If U

rms(1)

is u ed, then the u certainty of a dip or swel d ration

is eq al to the dip or swel commen ement u certainty (one c cle) plu the dip or swel

con lu ion u certainty (one c cle)

5.4.5.3 Ag re ation

Ag regation is not a plca le for trig ered events

5.5 Volta e inter uption

The b sic me s rement of the voltage s al b as defined in 5.4.1 for e c clas

Trang 29

5.5.2 Ev luation of a volta e inter uption

The voltage inter uption thres old is a p rcentage of U

din

On sin le-phase s stems, a voltage inter uption b gin when the U

rmsvoltage fal s b low the

voltage inter uption thres old an en s when the U

rmsvalue is eq al to, or gre ter than, the

voltage inter uption thres old plu the h steresis

On p lyphase s stems, a voltage inter uption b gin when the U

rmsvoltages of al c annels

fal b low the voltage inter uption thres old, an en s when the U

rmsvoltage on an one

c annel is eq al to, or gre ter than, the voltage inter uption thres old plu the h steresis

The voltage inter uption thres old an the h steresis voltage are b th set by the u er

ac ordin to the a pl cation The voltage inter uption thres old s al not b set b low the

u certainty of the residual voltage me s rement plu the value of the h steresis Typical y,

the h steresis is eq al to 2 % of U

din

The start time of a voltage inter uption s al b the time stamp d with the time of the start of

defined by the thres old plu the h steresis

The d ration of a voltage inter uption is the time diferen e b twe n the b gin in an the

en of the voltage inter uption

NOT 1 Th v lta e interu tio thresh ld c n, for e ample, b set to 5 % or to 10 % of U

din

NOT 2 IEC 6 0 0-161:19 0, 161-0 -2 , c nsid rs a interu tio to h v o c re wh n th v lta e ma nitu e

is les th n 1 % of th n min l v lta e Howe er, it is dific lt to c re tly me sure v lta es b low 1 % of th

n min l v lta e Th refore, th user c uld c nsid r setin a a pro riate v lta e interu tio thresh ld

NOT 3 Th inter u tio of o e or more p ases o a p ly h se system c n b se n as a interu tio of th

su ply to sin le-p ase c stomers c n e te to th t system, e e th u h this wo ld n t b clas ifie as a

interu tio in a p ly h se me sureme t

Clau e A.3 provides some informative information on the sig ificant p rameters neces ary to

c aracterize tran ient voltages Me s rement of tran ient voltages can b u eful but is not

also exists at le st one of the fol owin comp nents: negative seq en e comp nent U

2

an /or zero seq en e comp nent U

0

Trang 30

The fu damental comp nent of the voltage input sig al is me s red over a 10-c cle time

interval for 5 Hz p wer s stems or a 12-c cle time interval for 6 Hz p wer s stems

NOT 1 Th efe t of h rmo ics is minimize b th use of a fiter or b usin a DF (Discrete Fo rier

Tra sform) alg rithm

NOT 2 Alg rithms th t use o ly th r.m.s v lu s to c lc late u b la c fai to ta e into a c u t th

c ntrib tio s of a g lar displa eme t to u b la c , a d c use u pre icta le results wh n h rmo ic v lta es

are prese t Th n g tiv se u n e u b la c a d zero se u n e u b la c pro id more pre ise a d more

dire tly useful v lu s

The negative seq en e u b lan e ratio u

2expres ed as a percentage is evaluated by:

The zero-seq en e u b lan e ratio u

0expres ed as a p rcentage is evaluated by:

NOT 3 Th zero se u n e u b la c b d finitio is zero wh n p ase-o-p ase v lta es are me sure

Howe er, th p ase-o-n utral or p ase- o-e rth v lta es c n sti c ntain th zero se u n e c mp n nt in

presented with a 1,0 % negative sequen e s al provide a re din x s c that 0,8 % ≤ x

Trang 31

The b sic me s rement of voltage harmonic , for Clas A, is defined in IEC 610 0-4-7

Clas I IEC 610 0-4-7 s al b u ed to determine a 10/12-c cle ga les harmonic

s bgroup meas rement, denoted U

sg,h

in IEC 610 0-4-7

NOT 1 Oth r meth ds, in lu in a alo u a d fre u n y d main meth ds, c n b prefere in sp cial

c ses (se , for e ample, IEC 610 0-3-8)

Me s rements s al b made at le st up to the 5

th

order

If the total harmonic distortion is calc lated, then it s al b calc lated as the s bgroup

total harmonic distortion (THDS ), defined in IEC 610 0-4-7

NOT 2 This me sureme t meth d g n rates a larg amo nt of d ta, whic , d p n in o th a plc tio ,

ma n e to b store , tra smite , a alyse , a d/or arc iv d De e din o th a plc tio , th amo nt of

d ta ma b re u e To re u e th amo nt of d ta, c nsid r a plyin statistic l meth ds at th me surin

lo atio , or storin o ly e treme a d a era e v lu s, or storin d taie d ta o ly wh n trig er thresh lds are

e c e e , or oth r meth ds

NOT 3 IEC 610 0-4-7 refers to re la in th symb l ‘Y’ b th symb l ‘I’ for c re ts, a d b th symb l

‘U’ for v lta es THDS

U

ma b th prefere termin lo y for v lta e THD Howe er, wh n se rc in th

610 0-4-7 d c me t for informatio a o t th se p rameters, se rc for th symb l ‘Y’

– Cla s S

The b sic me s rement of voltage harmonic , for Clas S, is defined in IEC 610 0-4-7

Clas I Ga s are p rmited (se 4.5) The manufacturer s al select either a 10/12-c cle

harmonic group desig ated U

is selected, b th defined in IEC 610 0-4-7

NOT 5 IEC 610 0-4-7 refers to re la in th symb l ‘Y’ b th symb l ‘I’ for c re ts, b th symb l ‘U’ for

v lta es, so U

g,h

or U

s ,h

ma b th prefere termin lo y Howe er, wh n se rc in th 610 0-4-7

d c me t for informatio a o t th se p rameters, se rc for th symb l ‘Y’

The maximum u certainty s al b twice the levels sp cified in IEC 610 0-4-7 Clas I

The anti-al asin low-p s fi ter sp cified in IEC 610 0-4-7 s al b o tional The ± ,0 %

maximum p rmis ible er or for time b twe n le din ed es req irement as sp cified in

IEC 610 0-4-7 s al b o tional, but the maximum u certainty req irement s al sti be

met over the ran e of influen e q antities sp cified in Clau e 6 of this stan ard

Trang 32

The me s rin ran e s al b 10 % to 10 % of Clas 3 electromag etic en ironment in

IEC 610 0-2-4

5.8.3 Me s reme t e aluation

No req irements

5.8.4 Ag re ation

Ag regation s al b p rformed ac ordin to 4.4 an 4.5

NOT To minimize stora e re uireme ts, afer a gre atio h s b e c mplete it ma b pra tic l to disc rd th

so rc d ta (su h as 10/12-c cle or 15 /18 -c cle d ta) if it is n lo g r re uire

5.9 Volta e interharmonic

ma b th prefere termin lo y Howe er, wh n se rc in th 610 0-4-7

d c me t for informatio a o t th se p rameters, se rc for th symb l ‘Y’

The man facturer s al sp cify the me s rement u certainty

The me s rin ran e s al b 10 % to 10 % of Clas 3 electromag etic en ironment in

IEC 610 0-2-4

5.9.3 Ev luation

No req irements

5.9.4 Aggre ation

Ag regation s al b p rformed ac ordin to Clau e 4.4 an Clau e 4.5

NOT To minimize stora e re uireme ts, afer a gre atio h s b e c mplete it ma b pra tic l to disc rd th

so rc d ta (su h as 10/12-c cle or 15 /18 -c cle d ta) if it is n lo g r re uire

Trang 33

5.10 Mains signal ng volta e on the s pply volta e

5.10.1 Ge eral

Main sig al n voltage, cal ed “rip le control sig al” in certain a pl cation , is a burst of

sig als, of en a pled at a non-harmonic freq en y, that remotely control in u trial eq ipment,

reven e meters, an other devices

– Cla s A

The method des rib d here s al b u ed for main sig al n freq en ies b low 3 kHz

For main sig al n freq en ies a ove 3 kHz, se IEC 610 0-3-8

This method me s res the level of the sig al voltage for a u er-sp cified car ier

freq en y

NOT Th p rp se of this meth d is to me sure th ma imum le el of th sig al v lta e, a d n t to

dia n se mains sig al n dific lties

Main sig al n voltage me s rement s al b based on:

– either the cor esp n in 10/12-c cle r.m.s value interharmonic bin; or

– the ro t of the s m of the s uares of the 4 ne rest 10/12-c cle r.m.s value

interharmonic bin ( or example, a 316,6 Hz rip le control sig al in a 5 Hz p wer

s stem s al b a proximated by a ro t of the s m of the s uares of 310 Hz, 315 Hz,

3 0 Hz an 3 5 Hz bin , avai a le from the DFT p rformed on a 10/12-c cle time

interval)

The first method is prefer ed if the u er-sp cified freq en y is in the centre of a DFT bin

The secon method is prefer ed if the freq en y is not in the centre of a bin

The u er s al select a detection thres old a ove 0,3 % U

din

as wel as the len th of the

recordin p riod up to 12 s The b gin in of a sig al n emis ion s al b detected

when the me s red value of the con erned interharmonic ex e d the detection thres old

The me s red values are recorded d rin a p riod of time sp cified by the u er, in order

to give the maximum level of the sig al voltage

For main sig al n voltage b twe n 3 % an 15 % of U

din, the u certainty s al not

ex e d ± % of the me s red value For main sig al n voltage b twe n 1 % an 3 %

of U

din

, the u certainty s al not ex e d ± ,15 % of U

din For mains sig al n voltage les

than 1 % of U

din, no u certainty req irement is given

An RVC event is defined in 3.2 an is general y an a rupt tran ition b twe n two r.m.s

voltages By definition, the two r.m.s voltages mu t b “ste d state”, a con ition that is

defined in the method b low

Trang 34

Dips an swel s ofen b gin or en with a rupt tran ition b twe n two r.m.s voltages.

However, by definition these are not RVC events b cau e they ex e d the dip or swel

thres old Further g idan e is fou d in the method b low

NOT 1 Thresh lds in th ra g of 1 % to 6 % mig t b c nsid re In IEC TR 610 0-3-7, for e ample, RV

thresh lds of 2,5 % to 6 % of U

dinfor me ium v lta e are c nsid re In IEC 610 0-3-3, R C thresh lds of

3,3 % to 6 % for low v lta e are c nsid re In b th sta d rds, th thresh lds are ln e to th n mb r of

R C e e ts p r h ur or p r d y In IEC 610 0-4-15, a thresh ld of 0,2 % is c nsid re for a simiar, b t n t

id ntic l p rameter

The RVC h steresis is set by the u er ac ordin to the a pl cation, an s al b les than

the RVC thres old

NOT 2 Hysteresis in th ra g of 5 % of th RV thresh ld mig t b c nsid re

To initiate the RVC detection method:

To detect an RVC event (se Fig res 6 an 7):

• A ‘voltage-is-ste d -state’ logic sig al s al b cre ted for e c voltage c an el This

logic sig al is true when the voltage on that c an el is in ste d state, an false

otherwise This logic sig al is determined from the U

rms(1/2)

values of e c voltage

c an el, as fol ows It is updated for e c new U

values, in lu in the new value, is

within the RVC thres old (in lu in the h steresis, if a pl ed) of the arithmetic me n,

then the ‘voltage-is-ste d -state’ logic sig al for that c an el is set to true; otherwise,

it is set to false

• On a p lyphase s stem, the combined ‘voltage-is-ste d -state’ logic sig al is the

logical-AND of the ‘voltage-is-ste d -state’ logic sig al of e c voltage c an el

• An RVC event b gin when the ‘voltage-is-ste d -state’ logic sig al c an es from

true to false

• When an RVC event b gin , the RVC h steresis is a pl ed to the RVC thres old, an

c an es to the voltage-is-ste d -state logic sig al are disa led for 100/12 half

c cles

• An RVC event en s when the ‘voltage-is-ste d -state’ logic sig al c an es from false

to true When an RVC event en s, the RVC h steresis is removed from the RVC

thres old The time stamp of the en of the RVC event is 10 /12 half c cles prior to

the logic sig al c an in from false to true

If a voltage dip or voltage swel is detected d rin an RVC event, in lu in the disa led

10 /120 half c cles, then the RVC event is dis arded b cau e the event is not an RVC

event It is a voltage dip or voltage swel

Trang 35

Clas S RVC, then “10 /12 ”, whic refers to half c cles, s al b re laced throu hout

the method with “5 /6 ”, whic refers to the eq ivalent n mb r of ful c cles

– Cla s A

• The start time of an RVC event s al b time stamp d with the time that the ‘voltag

e-is-ste d -state’ logic sig al b came false an initiated the RVC event

• The RVC event d ration is 10 /12 half c cles s orter than the len th of time d rin

whic the ‘voltage-is-ste d -state’ logic sig al is false

o a fix d interv l or a h ur b se o a sldin interv l c mprisin th most re e t 6 min tes sldin o c p r

min te o th min te Th p rio c n also b a “d y” a d b se o c le d r time or b se o a sldin interv l

c mprisin th most re e t 2 h urs, sldin o c p r h ur o th h ur

NOT 2 Oth r c ara teristics to e alu te a R C e e t are u d r c nsid ratio For e ample, th ∆U

max

c uld

b e alu te b se o 10/12 c cle a gre ate v lu s

NOT 3 In some c ses, this R C me sureme t meth d ma n t fuly c ara terize intric te v riatio s b twe n

two ste d states Re ordin th se u n e of U

selected for Clas S RVC, then 10 /12 half c cles s al b re laced throu hout the

event evaluation with 5 /6 ful c cles

Figure 6 – RVC e e t: e ample of a c a ge in r.m.s volta e that re ults in a RVC e e t

IEC

“vltae is-ste dy-state”lo ic sig al

Chnes in “vltae-is-ste dy-state”loic sig al are disaled

Trang 36

In a p wer q al ty context, c r ent me s rements are u eful as a s p lement to voltage

me s rements, esp cial y when tryin to determine the cau es of events s c as voltage

mag itu e c an e, dip, inter uption, or u b lan e

The c r ent waveform can further help as ociate the recorded event with a p rtic lar device

an an action, s c as a motor b in started, a tran former b in energized or a ca acitor

b in switc ed

Link d with voltage harmonic an interharmonic , the c r ent harmonic an interharmonic

can b u eful to c aracterize the lo d con ected to the network

This stan ard do s not define an trig er or thres old method for c r ent If c r ent c an es,

but the c an e is not s f icient to trig er one of the voltage thres old method , then that

c an e in c r ent is not a p wer q al ty event

NOT Cur e t tra sie ts are n t c nsid re in this sta d rd Some useful c mme ts are pro id d in An e A

IEC Dip thresh ld

Trang 37

5.13.2 Ma nitude of c r e t

5.13.2.1 Me s reme t

The man facturer s al sp cify a ful -s ale r.m.s c r ent, ta in into ac ou t a minimum ratio

b twe n p a in tantane u value an r.m.s value of 3,0

NOT This ratiois sometimes c le “crest fa tor

– Cla s A

The b sic me s rement s al b the r.m.s value of the c r ent mag itu e over a 10-c cle

time interval for a 50 Hz p wer s stem or a 12-c cle time interval for a 6 Hz power

s stem The b u daries of an c r ent me s rement interval s al b determined by, an

identical to, the b u daries of the interval for the cor esp n in voltage c an el

– Cla s S

The man facturer s al sp cify the r.m.s me s rement method an time interval u ed

NOT More d taie re uireme ts for Clas S are u d r c nsid ratio

NOT For sin le-p ase systems, th re is a sin le r.m.s c re t v lu For 3-p ase 3-wire systems, th re are

ty ic ly thre r.m.s c re t v lu s; for 3-p ase 4-wire systems, th re are ty ic ly fo r c r e t v lu s Th e rth

c re t ma b me sure as wel eith r b me surin c re t in a e rth c n u tor or b d terminin resid al

c re t

– Cla s A

Ag regation intervals as des rib d in 4.4 an 4.5 s al b u ed

For e c c r ent c an el, the c r ent ag regation intervals s al b determined by, an

identical to, the ag regation intervals of the cor esp n in voltage c an el

– Cla s S

The man facturer or the u er s al sp cify the me s rement intervals

5.13.3 Cur e t re ording

– Cla s A

If c r ent me s rement method are implemented, then whenever a voltage c an el is

recorded, the cor esp n in c r ent c an el s al also b recorded with timin

determined by, an identical to, the cor esp n in voltage c an el ( or example, if

U

rms(1/2)

is recorded, I

rms(1/2)

s al also b recorded, with al timin asp cts of the c r ent

me s rement determined by the timin of the cor esp n in voltage c an el)

– Cla s S

The man facturer or the u er s al sp cify when the c r ent wi b recorded

Trang 38

5.13.4 Harmonic c r e ts

– Cla s A

The b sic me s rement method an ac urac of c r ent harmonic , for the purp se of

this stan ard, are defined in IEC 610 0-4-7 Use that stan ard to determine a 10/12-c cle

ga les harmonic s b-group me s rement, denoted Y

sg,h

NOT 1 IEC 610 0-4-7 refers to re la in th symb l ‘Y’ b th symb l I for c re ts, b th symb l ‘U’ for

v lta es, so I

s ,h

ma b th prefere termin lo y Howe er, wh n se rc in th 610 0-4-7 d c me t for

informatio a o t th se p rameters, se rc for th symb l ‘Y’ Ag re atio interv ls as d scrib d in 4.4 a d

4.5 are use

A 10/12-c cle c r ent harmonic me s rement is mark d "flag ed" if either a voltage dip or

voltage swel (se 5.4) or a voltage inter uption (se 5.5) oc urs d rin this time interval

The b sic me s rement method an ac urac of c r ent interharmonic , for the purp se

of this stan ard, are defined in 610 0-4-7 Use that stan ard to determine a 10/12-c cle

ga les centred interharmonic s b-group me s rements, denoted Y

isg,n

Ag regation intervals as des rib d in 4.4 an 4.5 s al b u ed

A 10/12-c cle interharmonic c r ent me s rement is mark d "flag ed" if either a voltage

dip or a voltage swel (se 5.4), or a voltage inter uption (se 5.5) oc urs d rin this time

interval

e c e e , or oth r meth ds

NOT 2 IEC 610 0-4-7 refers to re la in th symb l ‘Y’ b th symb l I for c re ts, b th symb l ‘U’ for

v lta es, so I

s ,h

ma b th prefere termin lo y Howe er, wh n se rc in th 610 0-4-7 d c me t for

informatio a o t th se p rameters, se rc for th symb l ‘Y’

– Cla s S

The man facturer s al sp cify me s rement an ag regation method

5.13.6 Cur e t u bala c

– Cla s A

The b sic me s rement method for c r ent u b lan e s al b identical to the

me s rement method for s p ly voltage u b lan e in 5.7

Ag regation intervals as des rib d in 4.4 an 4.5 s al b u ed A 10/12-c cle c r ent

u b lan e me s rement is mark d "flag ed" if either a voltage dip or a voltage swel (se

5.4), or a voltage inter uption (se 5.5) oc urs d rin this time interval

– Cla s S

The man facturer s al sp cify me s rement an ag regation method

6 Performa ce verification

Performan e verification for Clas A an Clas S me s rement method may b fou d in

IEC 6 5 6-2, whic in lu es influen e q antities an p rforman e verification tests

Trang 39

Ta le 1 provides an informative s mmary of the req irements for Clas A an Clas S In

case of an confl ct b twe n Ta le 1 an the normative clau es of this doc ment, the

normative clau es prevai

Note that compl an e with the req irements in Ta le 1 is not s ficient for certification to this

stan ard The me s rement an ag regation method in this stan ard s al also b met

Table 1 – Summary of re uireme ts (s e s bcla s s for a tual re uireme ts)

c mp n nts:

U

2, a d

Trang 40

Th instrume t sh l tolerate sig als in th influ n e q a tity ra g with ut shifin th me sureme t of oth r

p rameters o t of th ir u c rtainty re uireme t, a d with ut instrume t d ma e Th instrume t ma in ic te

o era g for sig als gre ter th n th me surin ra g , u to th influ n e q a tity ra g (n t in lu in

tra sie ts a d fast tra sie ts)

c

For tra sie t v lta es a d fast tra sie ts, th re sh l b n efe t o a y me sureme t afer th tra sie t

Th tra sie ts are a ple to th me surin termin ls, n t to th instrume t p wer termin ls

Tiêu đề	IEC 61000-4-30:2015-02 Power Quality Measurement Methods
Trường học	International Electrotechnical Commission (IEC)
Chuyên ngành	Electrotechnical Standards
Thể loại	Standards Document
Năm xuất bản	2015
Thành phố	Geneva

Định dạng
Số trang	150
Dung lượng	2,73 MB