Iec ts 61936 2 2015

In ex e tional circ mstan es, a tec nical commit e may pro ose the publ cation of a tec nical sp cification when • the req ired s p ort can ot b o tained for the publ cation of an Intern

THIS PUBLICATION IS COPYRIGHT PROTECTED

Copyr ight © 2 15 IEC, Ge e a, Switzer la d

Al rig ts r es r ve Unle s oth rwis s e ifi d, n p rt of this p blc tio ma b r epr od c d or uti z d in a y form

or b a y me n , ele tr onic or me h nic l in lu in p oto o yin a d microfim, with ut p rmis io in wr itin from

eith r IEC or IEC's memb r Natio al Commite in th c u tr y of th re u ste If y u h v a y q e tio s a o t IEC

c p r i ht or h v a e q ir y a o t o tainin a ditio al ri hts to this p blc tio , ple s c nta t th a dr es b low or

y ur lo al IEC memb r Natio al Commite for ur th r informatio

Th Intern tio al Ele trote h ic l Commis io (IEC) is th le din glo al org niz tio th t pr ep res a d p bls e

Internatio al Sta d r ds for al ele tri al ele tr onic a d relate te h olo ie

Abo t IEC p blc tio s

Th te h ic l c nte t of IEC p blc tio s is k pt u d r c n ta t r eview b th IEC Ple s ma e s re th t y u h v th

late t e itio ,a c rr ig n a or a ame dme t mig t h v b e p bls e

IEC Cat alo ue - webst ore.e ch/ cat alo ue

Th st an -alo e a plc t io for c n ultin th e tire

biblo ra hic l informat io o IEC Intern tio al Sta d rd ,

Te h ic l Sp cific tio s, Te h ic l R ep rts a d oth r

d c me ts A v aia le for P , Ma OS, A ndroid Ta let s a d

iPa

IEC p blc t i ns s arch - www ie ch/ se rch u

Th a v an e s arc e a le t o fin IEC p blc t io s b a

variety of crit eria (efere c n mb r, t ext, t ec nic l

c mmitt e,…) It als gives informatio o projec t s, re la e

a d wit hdrawn p blc tio s

IEC Just P blshed - webst ore.e ch/ just pu lshed

St ay u to d te o al n w IEC p blc tio s Ju t Pu ls e

d t ais al n w p blc t io s rele s d A v aia le o ln a d

als o c a mo t h b emai

Ele t ro edia - www ele t ro edia.org

Th world's le din o ln dic t io ary of elec t ro ic a d

ele t ric l t erms c ntainin more t ha 3 0 0 terms a d

d finitio s in En ls a d Fre c , wit h e uiv ale t t erms in 15

a ditio al la g a e Als k nown a t he Int ern t io al

Elec t rot ec nic l Vo a ulary (IEV ) o ln

IEC Glos ar y - st d.e ch/ glos ary

More t ha 6 0 0 ele t rot ec nic l termin lo y e t rie in

En ls a d Fre c e tra t ed fom t he Terms a d Definitio s

c la s of IEC p blc t io s is u d sin e 2 0 Some e t rie

h v e b e c le t ed fom e rler p blc tio s of IEC TC 3 ,

7 ,8 a d CISPR

IEC Cust omer Servic Cent re - webst ore.ec ch/ csc

If y ou wis to giv e u your fe d a k o t his p blc tio or

n e furt her a sista c , ple s c nta t t he Cu tomer Serv ic

Ce t re:c c@ie c

INT ERNAT IONAL

ELECT ROT ECHNICAL

FOREWORD 5

INTRODUCTION 8

1 Sco e 9

2 Normative ref eren es 9

3 Terms an def i ition 10 4 Fu damental req irements 12 4.1 General 12 4.1.1 General req irements 12 4.1.2 Agre ments b twe n s p l er (manufacturer) an u er 12 4.2 Electrical req irements 12 4.2.1 Method of d.c neutral p int e rthin 1

2 4.2.2 Voltage clas if i ation 13 4.2.3 Cur ent in normal o eration 13 4.2.4 Short-circ it c r ent 13 4.2.5 Rated f eq en y 13 4.2.6 Corona 13 4.2.7 Electric an mag etic field 14 4.2.8 Overvoltages 14 4.2.9 Harmonic 14 4.2.10 Galvanic se aration b twe n a.c an d.c s stems 14 4.3 Mec anical req irements 14 4.4 Cl matic an en ironmental con ition 14 4.4.1 General 1

4

4.4.2 Normal con ition 15

4.4.3 Sp cial con ition 15

4.5 Sp cial req irements 15

5 In ulation 15

5.1 General 15

5.2 Selection of in ulation level 15

5.2.1 Con ideration of method of neutral e rthin 15

5.2.2 Con ideration of ated with tan voltages 15

5.3 Verification of with tan values 16

5.4 Minimum cle ran es of l ve p rts 16

5.5 Minimum cle ran es b twe n p rts u der sp cial con ition 18

5.6 Tested con ection zones 18

6 Eq ipment 18

6.1 General req irements 18

6.2 Sp cif i req irements 18

6.2.1 Switc in devices 18

6.2.2 Re ctors 18

6.2.3 Prefa ricated typ -tested switc ge r 19

6.2.4 Surge ar esters 19

6.2.5 Ca acitors 19

6.2.6 Line tra s 19

6.2.7 In ulators 19

6.2.9 Con u tors an ac es ories 2

6.2.10 Rotatin electrical mac ines 2

6.2.11 Static converters 2

6.2.12 Fu es 2

6.2.13 Electrical an mec anical Interloc in 2

6.2.14 Electronic valve devices 2

6.2.15 Valve co l n s stem 2

7 In talation 21

7.1 General req irements 21

7.1.1 Circ it ar an ement 21

7.1.2 Doc mentation 21

7.1.3 Tran p rt routes 21

7.1.4 Aisles an ac es are s 21

7.1.5 Lig tin 21

7.1.6 Op rational safety 21

7.1.7 L bel n 21

7.2 Outdo r in tal ation of o en desig 21

7.2.1 Protective b r ier cle ran es 2

7.2.2 Protective o stacle cle ran es 2

7.2.3 Bou dary cle ran es 2

7.2.4 Minimum heig t over ac es are 2

7.2.5 Cle ran es to buidin s 2

7.2.6 External f en es or wal s an ac es do rs 2

7.3 In o r in tal ation of o en desig 2

7.4 In tal ation of pref abricated typ -tested switc ge r 2

7.5 Req irements f or bui ding 2

7.5.1 General 2

7.5.2 Stru tural provision 2

7.5.3 Ro ms for switc ge r 2

7.5.4 Maintenan e an o eratin are s 2

7.5.5 Do rs 2

7.5.6 Drainin of in ulatin lq id 2

7.5.7 Air con itionin an venti ation 2

7.5.8 Bui din s whic req ire sp cial con ideration 2

7.6 Hig voltage/low voltage prefa ricated s bstation 2

7.7 Electrical in tal ation on mast, p le an tower 2

8 Safety me s res 2

8.1 General 2

8.2 Protection again t direct contact 2

8.2.1 Me s res f or protection again t direct contact 2

8.2.2 Protection req irements 2

8.3 Me n to protect p rson in case of in irect contact 2

8.4 Me n to protect p rson workin on electrical in tal ation 2

8.5 Protection f rom dan er res ltin f rom arc fault 2

8.6 Protection again t direct l g tnin strokes 2

8.7 Protection again t fire 2

8.8 Protection again t le kage of in ulatin l q id 2

8.9 Identification an markin 2

10 Earthin s stems 2

10.1 General 2

10.2 Fu damental req irements 2

10.2.1 Saf ety criteria 2

10.2.2 Fu ctional req irements 3

10.2.3 Hig an low voltage e rthin s stems 3

10.3 Desig of e rthin s stems 3

10.3.1 General 3

10.3.2 Power s stem f aults 31

10.3.3 Lig tnin an tran ients 31

10.4 Con tru tion of e rthin s stems 31

10.5 Me s rements 31

10.6 Maintaina i ty 31

10.6.1 In p ction 31

10.6.2 Me s rements 3

1 In p ction an testin 3

1 1 General 3

1 2 Verification of sp cif ied p rf orman es 3

1 3 Tests d rin in tal ation an commis ionin 3

1 4 Trial ru nin 3

12 Op ration an maintenan e man al 3

An ex A (informative) Values of rated in ulation levels an minimum cle ran es in air b sed on nominal voltage of some HVDC projects worldwide 3

An ex B (normative) Method of calc latin the voltage lmit 3

Biblogra h 3

Fig re 1 – Ap ro c es with bui din s (within closed electrical o eratin are s) 2

Fig re 2 – Tou h voltage l mit d.c 3

INTERNATIONAL ELECTROTECHNICAL COMMISSION

_

POWER INSTA LLA TIONS EXCEEDING 1 kV a.c and 1,5 kV d.c –

Part 2: d.c

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

al n tio al ele trote h ic l c mmite s (IEC Natio al Commite s) Th o je t of IEC is to promote

intern tio al c -o eratio o al q e tio s c n ernin sta d rdiz tio in th ele tric l a d ele tro ic f i ld To

this e d a d in a ditio to oth r a tivitie , IEC p bls e Intern tio al Sta d rd , Te h ic l Sp cific tio s,

Te h ic l Re orts, Pu lcly Av ia le Sp cific tio s (P S) a d Guid s (h re f ter refer e to a “IEC

Pu lc tio (s)”) Th ir pre aratio is e tru te to te h ic l c mmite s; a y IEC Natio al Commite intere te

in th s bje 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 niz tio s laisin with th IEC als p rticip te in this pre aratio IEC c la orate clo ely

with th Intern tio al Org niz tio f or Sta d rdiz tio (ISO) in a c rd n e with c n itio s d termin d b

a re me t b twe n th two org niz tio s

2) Th f ormal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al

c n e s s of o inio o th rele a t s bje ts sin e e c te h ic l c mmite h s re re e tatio fom al

intere te IEC Natio al Commite s

3) IEC Pu lc tio s h v th f orm of re omme d tio s f or intern tio al u e a d are a c pte b IEC Natio al

Commite s in th t s n e Whie al re s n ble ef forts are ma e to e s re th t th te h ic l c nte t of IEC

Pu lc tio s is a c rate, IEC c n ot b h ld re p n ible for th wa in whic th y are u e or f or a y

misinterpretatio b a y e d u er

4) In ord r to promote intern tio al u iformity, IEC Natio al Commite s u d rta e to a ply IEC Pu lc tio s

tra s are tly to th ma imum e te t p s ible in th ir n tio al a d re io al p blc tio s An div rg n e

b twe n a y IEC Pu lc tio a d th c re p n in n tio al or re io al p blc tio s al b cle rly in ic te in

th later

5) IEC its lf d e n t pro id a y ate tatio of c nf ormity In e e d nt c rtif i atio b die pro id c nformity

a s s me t s rvic s a d, in s me are s, a c s to IEC mark of c nformity IEC is n t re p n ible f or a y

s rvic s c rie o t b in e e d nt c rtif i atio b die

6) Al u ers s o lde s re th t th y h v th late t e itio of this p blc tio

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

memb rs of its te h ic l c mmite s a d IEC Natio al Commite s f or a y p rs n l injury, pro erty d ma e or

oth r d ma e of a y n ture wh ts e er, wh th r dire t or in ire t, or for c sts (in lu in le al f ee ) a d

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

Pu lc tio s

8) Ate tio is drawn to th Normativ refere c s cite in this p blc tio Us of th refere c d p blc tio s is

in is e s ble f or th c r e t a plc tio of this p blc tio

9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of

p te t rig ts IEC s al n t b h ld re p n ible for id ntif yin a y or al s c p te t rig ts

The main tas of IEC tec nical commite s is to pre are International Stan ard In

ex e tional circ mstan es, a tec nical commit e may pro ose the publ cation of a tec nical

sp cification when

• the req ired s p ort can ot b o tained for the publ cation of an International Stan ard,

despite re e ted ef forts, or

• the s bject is sti u der tec nical develo ment or where, for an other re son, there is the

f uture but no immediate p s ibi ty of an agre ment on an International Stan ard

Tec nical sp cif i ation are s bject to review within thre ye rs of publ cation to decide

whether they can b tran f ormed into International Stan ard

IEC 619 6-2, whic is a tec nical sp cification, has b en pre ared by tec nical commite 9 :

Sy tem en ine rin an erection of electrical p wer in tal ation in s stems with nominal

voltages a ove 1 kV a.c an 1,5 kV d.c p rtic larly con ernin saf ety asp cts

Future stan ard in this series wi car y the new general title as cited a ove Titles of existin

stan ard in this series wi b updated at the time of the next edition

The text of this tec nical sp cification is b sed on the fol owin doc ments:

En uiry draft Re ort o v tin

Ful information on the votin for the a proval of this tec nical sp cification 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 ted in ac ordan e with the ISO/IEC Directives, Part 2

A l st of al p rts in the IEC 619 6 series, publ s ed u der the general title P ower inst allations

exce d in 1 k V a.c a d 1,5 k V d c can b f ou d on the IEC we site

The fol owin diff eren es exist in the cou tries in icated b low:

7.2.4: For lv p rts with ut prote tiv fa i tie , a minimum h ig t H = N + 2 4 0 mm s al b maintain d

(Au trala)

7.2.6: Guid n e refere c c n tru tio c n b f ou d at EN Do 015 (Au trala)

7.5.4: Sp c for e a u tio s al alwa s b at le st 6 0 mm, e e wh n remo a le p rts or o e d ors, whic are

blo k d in th dire tio of e c p , intru e into th e c p ro te (Au trala)

8.7.1: Fire ratin of b riers mu t b a minimum fire ratin of 2 min te (Au trala)

8.7.2: Th dime sio s G

1

a d G

2are to b me s re fom th in id e g wal of a y b n wal rath r th n th

me s re p int s own in Fig re 7 ) a d 7 ) of IEC 619 6- :2 10/AMD1:2 14 fom th tra sformer wh re th b n

wal is wid r th n th tra sf ormer (Au trala)

8.8: Spi c ntainme t s o ld e te d b 5 % of th h ig t of th tra sf ormer (Au trala)

10:For re uireme ts o e rthin , refer toAS 2 6 , Su statio s a d Hig Volta e In talatio s (Au trala)

10.2.1: HV e rthin s stems s o ld b d sig e a c rdin to tolera le v lta e b s d o b d imp d n e n t

e c e e b 5 % of th p p latio , a giv n in Ta le 10 of IEC T 6 4 9- :2 0 (Unite Kin d m)

10.2.1: Permis ible to c a d ste v lta e in p wer in talatio s s al b in a c rd n e with Fe eral law

c n ernin ele tric l in talatio s (Hig a d low v lta e) (SR 7 4.0) a d Re ulatio s f or ele tric l p wer

in talatio s (SR 7 3.2 StV).(Switz rla d)

10.2.1 a d An e B: Earthin re uireme ts are b s d o pro a i stic c lc latio s a d s mu h of th cla s is n t

a pro riate for Au trala (Au trala)

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 indicated on the IEC we site u der "htp:/we store.iec.c " in the data

related to the sp cif i publ cation At this date, the publ cation wi b

• tran formed into an International stan ard,

• reconfirmed,

• with rawn,

• re laced by a revised edition, or

A bi n ual version of this publcation may b is ued at a later date

IMPORTANT – The 'colour inside' logo on the cov r pa e of this publ c tion indic te

th t it contains colours whic are considere to be us f ul f or the cor e t

und rsta ding of its conte ts Us rs s ould theref ore print this doc me t using a

colour printer

There are f ew national laws, stan ard an internal rules de l n with the mat er comin

within the s o e of this tec nical sp cif i ation, an these practices have b en taken as a

b sis for this work

This p rt of IEC 619 6 contain the minimum req irements val d for IEC cou tries an some

ad itional information whic en ures an ac e ta le rel a i ty of an in tal ation an its safe

o eration

This p rt of IEC 619 6 is publ s ed as a Tec nical Sp cif i ation in order to welcome

contribution an in olvement fom a wider au ien e This may provide the b sis for a f uture

international stan ard

The publcation of this tec nical sp cification is b l eved to b a decisive ste toward the

grad al al g ment al over the world of the practices con ernin the desig an erection of

hig voltage p wer in tal ation

Partic lar req irements f or tran mis ion an distribution in tal ation as wel as p rtic lar

req irements for p wer generation an in u trial in tal ation are in lu ed in this tec nical

sp cification

The relevant laws or reg lation of an authority havin juris iction takes preceden e

POWER INSTA LLA TIONS EXCEEDING 1 kV a.c and 1,5 kV d.c –

Part 2: d.c

This p rt of IEC 619 6 provides, in a con enient form, common rules f or the desig an the

erection of electrical p wer in tal ation in s stems with nominal voltages a ove 1,5 kV d.c

so as to provide safety an pro er f un tionin for the u e inten ed

This tec nical sp cification do s not a ply to the desig an erection of an of the folowin :

– overhe d an u dergrou d l nes b twe n se arate in talation ;

– electric rai way ;

– minin eq ipment an in tal ation ;

– in tal ation on s ips an of f-s ore in talation ;

– electrostatic eq ipment (e.g electrostatic precipitators, spray-p intin u its);

– test sites;

– medical eq ipment, e.g medical X- ay eq ipment;

– valve hal

This tec nical sp cification do s not a ply to the desig of f actory-bui t, typ -tested

switc ge r f or whic se arate IEC stan ard exist

This tec nical sp cification do s not a ply to the req irements for car yin out l ve workin on

electrical in talation

This tec nical sp cification do s not a ply to the desig of f actory-buit, typ -tested thyristor

valves, VSC valves an switc ge r for whic se arate IEC stan ard exist

The f ol owin doc ments, in whole or in p rt, are normatively ref eren ed in this doc ment an

are in isp n a le f or its a pl cation For dated ref eren es, only the edition cited a ples For

u dated ref eren es, the latest edition of the ref eren ed doc ment (in lu in an

amen ments) a pl es

IEC 6 0 0-1, High-v lt ag test te h iq es – P art 1: Ge eral definitio s a d test re uireme ts

IEC 6 0 1-1, Insulation c -ord in tio – Part 1: Definitio s, prin i ples a d rules

IEC 6 0 1-2:19 6, Insulation c -ord in t io – P art 2: Ap li at ion g id e

IEC 6 0 1-5, I nsulat io c -ord inat io – P art 5: Pro ed ures for high v ltag d ire t c re t

(HVDC) c n erter statio s

IEC 6 0 9-10-1, Ex losiv atmosp eres – P art 10-1: Clas ific t io of are s – Ex losiv g s

at mosp eres

IEC 6 0 9-10-2, Ex losive atmosp eres − P art 10-2: Clas ific t io of are s − Comb stible

dust atmosp eres

IEC TS 6 4 9-1:2 0 , Efe ts of c re t o h ma b ings a d livestoc – P art 1: Ge eral

asp cts

IEC 6 5 9, De re s ofprot ection pro id ed b e closures (IP Cod e)

IEC TR 610 0-5-2, Elect roma n tic c mp t ibiity (EMC) – P art 5: I nst allat ion a d mitigat io

g id eli es – Se t ion 2: Earthin a d c bling

IEC 619 6-1:2 10, P ower installat ions ex ce d ing 1 k V a.c – P art 1: Commo rules

complete o erative controla le or non-control a le valve device as embly, normal y

con u tin in only one direction ( he f orward direction), whic can f un tion as a con erter arm

in a con erter brid e

Note 1 to e try: An e ample of a n n-c ntrola le v lv d vic a s mbly is a s mic n u tor dio e v lv An

e ample of a c ntrola le v lv d vic a s mbly is a th ristor v lv

[SOURCE: IEC 6 63 :19 8, 6.3]

3.2

ele tronic v lv de ic

in ivisible electronic device for electronic p wer con ersion or electronic p wer switc in ,

comprisin a sin le non-control a le or bista ly control ed u idirectional y con u tin c r ent

p th

Note 1 to e try: Ty ic l ele tro ic v lv d vic s are th ristors, p wer re tifier dio e , p wer switc in bip lar

a d f i ld ef fe t tra sistors a d in ulate -g te bip lar tra sistors (IGB )

Note 2 to e try: Two or more ele tro ic v lv d vic s ma b inte rate o a c mmo s mic n u tor c ip

(e ample : a th ristor a d a re tifier dio e in a re ers c n u tin th ristor, a p wer switc in f i ld ef fe t

tra sistor with its in ers dio e) or p c a e in a c mmo c s (s mic n u tor p wer mo ule) Th s

c mbin tio s are to b c n id re a s p rate ele tro ic v lv d vic s

[SOURCE: IEC 6 05 -5 1:19 8, 5 1-14-0 ]

3.3

nominal volta e, < f a s stem>

s ita le a proximate value of voltage u ed to desig ate or identify a s stem

[SOURCE: IEC 6 0 0-6 1:19 5, 6 1-01-21]

3.4

highe t volta e, < f a d.c s stem>

U

dm

hig est me n or average p le d.c voltage to e rth, ex lu in harmonic an commutation

overs o ts, f or whic the in tal ation is desig ed in resp ct of its in ulation

con erter station

p rt of a p wer s stem whic intercon ects an a.c s stem to a d.c s stem or two d.c

s stems with dif ferent voltages ena l n p wer tran fer f rom one s stem to the other an /or

vice versa

3.10

d.c e rth ele trod

d.c grou d electrode

ar ay of con u tive elements placed in the e rth, or the se , whic provides a low resistan e

p th b twe n a p int in the d.c circ it an the e rth an is ca a le of car yin contin ou

c r ent f or some exten ed p riod

Note 1 to e try: An e rth ele tro e ma b lo ate at a p int s me dista c fom th H D s b tatio

Note 2 to e try: Wh re th ele tro e is pla e in th s a it ma b terme a s a ele tro e

[SOURCE: IEC 6 6 3:19 8, 8.14, modified – The in ication "d.c." has b en ad ed to the term

an a s nonym, d.c grou d electrode, has b en ad ed

3.1

pole

p rt of an HVDC s stem con istin of al the eq ipment in the HVDC s bstation an

intercon ectin tran mis ion lnes, if an , whic d rin normal o eration, ex ibit a common

direct voltage p larity with resp ct to e rth

3.13

switc ing impuls prote tiv le el < f a protective device

U

ps

maximum p rmis ible p ak voltage value, on the terminals of a protective device s bjected to

switc in impulses u der sp cif i con ition

The method of d.c neutral p int e rthin of a s stem is imp rtant with regard to the f ol owin :

– selection of in ulation level;

– c aracteristic of overvoltage-l mitin devices s c as sp rk ga s or s rge ar esters;

– selection of protective relay

The f ol owin are examples of d.c neutral p int e rthin method :

– isolated neutral;

– hig imp dan e e rthin ;

– hig resistive e rthin ;

– sold (low imp dan e) e rthin

The c oice of the typ of d.c neutral p int e rthin is normal y b sed on the f olowin criteria:

– local reg lation (if an );

– contin ity of service req ired for the network;

– l mitation of damage to eq ipment cau ed by e rth faults;

– selective el mination of aulty section of the network;

– detection of fault location;

– tou h an ste voltages;

– in u tive interf eren e;

– o eration an maintenan e asp cts

One galvanical y con ected d.c s stem has only one method of d.c neutral p int e rthin

Dif ferent galvanical y in e en ent d.c s stems may have diff erent method of d.c neutral

p int e rthin , so the e rthin p int could b located in one or b th con erter station

The a.c an d.c s stems may b either galvanical y se arated or not The d.c neutral p int

e rthin method of an a.c s stem not galvanical y se arated fom the d.c one has an ef fect

on the d.c neutral p int e rthin an vice versa Desig of eq ipment an protective s stem

s al take into ac ou t this fe ture

If diff erent d.c neutral p int e rthin config ration can oc ur d rin normal or a normal

o eratin con ition , eq ipment an protective s stem s al b desig ed to o erate u der

these con ition

4.2.2 Volta e cla sific tion

The nominal voltage an the maximum o eratin voltage of the s stem s al b agre d

b twe n u er an man facturer

Based on the maximum o eratin voltage the hig est voltage of a d.c s stem (U

dm) s al b

selected

4.2.3 Cur e t in normal operation

Every p rt of an in talation s al b desig ed an con tru ted to with tan c r ents u der

defined o eratin con ition

4.2.4 Short circ it c r e t

In tal ation s al b desig ed, con tru ted an erected to safely with tan the mec anical

an thermal ef fects res ltin fom s ort-circ it c r ents

For the purp ses of this stan ard, al a pl ca le types of s ort-circ its, whic may ha p n,

s al b con idered, e.g

– p le-to-e rth;

– p le-to-p le;

– double p le-to-e rth;

– con erter arm

In tal ation s al b protected with automatic devices or fu ction to dis on ect or switc of f

the d.c s stem in case of p le-p le or p le-p le-e rth s ort circ it

In case of p le-e rth or metal c return or d.c electrode l ne to e rth, in tal ation s al b

protected with automatic devices or fu ction to dis on ect or switc of the d.c s stem or

with a device to in icate the e rth fault con ition

The selection of the device or fu ction is de en ent up n the method of d.c neutral p int

e rthin

Selection of mag itu e an d ration of s ort circ it c r ent s al b agre d b twe n

man facturer an u er

Method for the calc lation of the eff ects of s ort-circ it c r ent are given, f or p wer ca les,

in IEC 6 9 9

The provision of IEC 619 6-1:2 10, 4.2.5 is not a pl ca le

4.2.6 Corona

The desig of in tal ation s al b s c that radio intereren e d e to electromag etic field ,

e.g cau ed by corona eff ects, wi not ex e d a sp cif ied level

When the ac e ta le value is ex e ded, the corona level may b control ed, for example, by

the in tal ation of corona rin s or the reces in of f asteners on bu fit in s for hig -voltage

s sp n ion in ulator as embl es, bu s p ort as embl es, bu con ection an eq ipment

terminals

Maximum p rmis ible levels of radio interf eren e are given by national or local authorities in

some cou tries

Guidan e on ac e ta le levels of radio interf eren e voltage for a.c switc ge r an

controlge r can b fou d in IEC 6 2 1-1 in whic the emis ion tests are recommen ed fom

a.c voltages of 12 kV an a ove In a sen e of other criteria, it is pro osed that emis ion

tests as p r IEC 6 271-1:2 0 , 6.9.1 is p rf ormed on eq ipment s bjected to a direct voltage

NOT Re omme d tio s f or minimizin th ra io interere c of hig -v lta e in talatio s are re orte in

CISPR 18- , CISPR 18-2 a d CISPR 18-3 [ ,2,3]

1

4.2.7 Ele tric a d ma n tic fields

The desig of an in tal ation s al b s c as to l mit the electric an mag etic field

generated by energized eq ipment to an ac e ta le level f or exp sed p o le

National an /or international reg lation may sp cify ac e ta le levels

Se 4.2.8 of IEC 619 6-1:2 10

4.2.9 Harmonic

Se 4.2.9 of IEC 619 6-1:2 10

4.2.10 Galv nic s paration betwe n a.c a d d.c s stems

The a.c an d.c s stems may b either galvanical y se arated or not Galvanic se aration

b twe n a.c an d.c s stems is general y o tained by me n of con erter tran formers

NOT Re ardle s of g lv nic s p ratio b twe n a.c a d d.c s stems th re is alwa s a p rtio of a.c s stem

c mpris d within th c n erter tra sf ormer a d th ele tro ic v lv d vic s whic is n t g lv nic ly in ulate

In talation , in lu in al devices an au i ary eq ipment whic f orm an integral p rt of them,

s al b desig ed for o eration u der the cl matic an en ironmental con ition l sted b low

The presen e of con en ation, precipitation, p rticles, d st, cor osive elements an

hazardou atmospheres s al b sp cified in s c a man er that a pro riate electrical

eq ipment can b selected Zone clas ification for hazardou are s s al b p rormed in

ac ordan e with IEC 6 0 9-10-1 an IEC 6 0 9-10-2

_ _ _ _ _ _ _

Du t ac umulates con tantly on in ulators an con u tive s r aces immersed in a d.c electric

f ield In in tal ation with hig levels of d.c electric field sp cial care s al b p id either to

cre p ge len th or air tre tment (in o r in tal ation )

In cases with he v p l ution levels, the in o r air could b tre ted an overpres urized

4.4.2 Normal con itions

As con entional (air in ulated) d.c in tal ation are normal y not impulse tested, the d.c

in tal ation req ires minimum cle ran es b twe n l ve p rts an e rth an b twe n l ve p rts

of p les in order to avoid flas over b low the impulse with tan level selected f or the

in tal ation

In ulation co rdination s al b in ac ordan e with IEC 6 0 1-5 an IEC 6 0 1-1 as far as

prin ip l definition an rules are con erned

5.2 Sele tion of in ulation le el

The in ulation level s al b c osen ac ordin to the esta l s ed hig est d.c voltage for

eq ipment U

dm

an /or impulse with tan voltage

5.2.1 Consid ration of method of ne tral e rthin

The c oice s ould b made primari y to en ure rel a i ty in service, takin into ac ou t the

method of d.c neutral p int e rthin in the s stem an the c aracteristic an the location of

overvoltage l miting devices to b in tal ed

In in tal ation in whic a hig level of safety is req ired, or in whic the config ration of the

s stem, the ado ted method of d.c neutral p int e rthin or the protection by s rge ar esters

make it ina pro riate to lower the level of in ulation, one of the hig er alternative values of

An ex A may b c osen

In in tal ation in whic the con g ration of the s stem, the ado ted method of d.c neutral

p int e rthin or the protection by s rge ar esters make it a pro riate to lower the level of

in ulation, the lower alternative values of An ex A may b s ff i ient

5.2.2 Consid ration of rate with ta d volta e

5 0 kV d.c.), the c oice is general y b sed on the rated switc in impulse with tan voltages

an the rated l g tnin impulse with tan voltages given in An ex A

5.3 Verif ic tion of withsta d v lue

5.3.1 If the minimum cle ran es calc lated ac ordin to 5.4 are maintained, it is not

neces ary to a ply dielectric tests

5.3.2 If the minimum cle ran es ref er ed to in 5.4 are not maintained, the a i ty to

with tan the test voltages of the c osen in ulation level s al b esta l s ed by a plyin the

a pro riate dielectric tests in ac ordan e with IEC 6 0 0-1 for the sp cified with tan voltage

values or by exact calc lation of p s ible overvoltages in the HVDC s stem an derivin

cle ran es b sed on IEC 6 0 1-1 an 6 0 1-2

5.3.3 If the minimum cle ran es ref eren ed to in 5.4 are not maintained in p rts or are s

of an in tal ation, dielectric tests restricted to these p rts or are s wi b s ff i ient

In ac ordan e with IEC 6 0 1-2:19 6, An ex B, minimum cle ran es may b lower if this has

b en proven by tests or by o eratin exp rien e of lower overvoltages

Switc in impulse p le-to-e rth with tan cle ran es in air, in meters, are given by the

fol owin Formula (1), b sed on negative switc in impulse with tan , whic res lts fom

Formula G.3 of IEC 6 0 1-2:19 6 an a pl es for altitudes up to 1 00 m a ove se level For

hig er altitu es, se 4.4.3.2 of IEC 619 6-1:2 10

[ ]

4,01

21

10 0

u

p,Sa

e

Kd

s

(1)

The minimum p le-to-p le cle ran e in meters is given by the fol owin Formula (2), b sed on

negative switc in impulse with tan , whic res lts f om Formula G.3 of IEC 6 0 1-2:19 6

an a pl es f or altitu es up to 1 0 0 m a ove se level F r hig er altitu es, se 4.4.3.2 of

IEC 619 6-1:2 10

[ ]

4,01

S21

10 0

u

p,Sa

dm2

Normal y, for d.c s stems with sol d e rth referen e, [u ]

p.u

= 2 p.u can b con ervatively

as umed f or switc in impulse with tan voltage In case of protection with s rge ar esters,

the [u ]

p.uvalue can b redu ed ac ordin to the switc in impulse protective level U

u

p,S

15,1

UU

The l g tnin impulse with tan (b th the p le-to-grou d an the p le-to-p le) cle ran e in

meters can b calc lated with the fol owin Formula (4):

1

211

Lt

=

sK

U

σd

is an atmospheric cor ection f actor ac ordin to IEC 6 0 0-1;

σ is a safety margin f or takin into ac ou t d st de osit an h midity that can b

p.uvalue can b red ced ac ordin to the

l g tnin impulse protective level U

pl

of the s rge ar esters with a pro er safety margin as

s own in the fol owin Formula (5):

plL

2,

(5)

The safety margin could b f urther red ced for sp cial in tal ation with control ed electric

f ield config ration an atmosphere as in con erter valve hal

In in tal ation in whic a hig level of saf ety is req ired, or in whic the config ration of the

s stem, the ado ted method of d.c neutral p int e rthin or the protection by s rge ar esters

make it ina pro riate to lower the level of in ulation, the safety margin can b in re sed

In in tal ation in whic the con g ration of the s stem, the ado ted method of d.c neutral

p int e rthing or the protection by s rge ar esters make it a pro riate to lower the level of

in ulation, the safety margin can b decre sed

In voltage ran e (U

dm

> 4 0 kV d.c.), the p le-to-e rth cle ran es in air are determined by the

rated switc in impulse with tan voltage (SIWV) They s bstantial y de en on the electrode

config ration In cases of dif fic lty in clas ifyin the electrode config ration, it is

recommen ed to make a c oice b sed on the phase-to-e rth cle ran es of the most

u favoura le con g ration s c as, for example, the arm of an isolator again t the tower

con tru tion (rod-stru ture)

5.4.2 If p rts of an in tal ation can b se arated fom e c other by a dis on ector, they

s al b tested at the rated impulse with tan voltage f or the isolatin distan e If b twe n

s c p rts of an in tal ation the minimum cle ran es calc lated with the f ormula of 5.4 are

in re sed by 2 % or more, it is not neces ary to a ply dielectric tests

5.5 Minimum cle ra c s betwe n parts under spe ial condition

5.5.1 Minimum cle ran es b twe n p rts of an in tal ation, whic are as ig ed to diff erent

in ulation levels, s al b at le st 12 % of the cle ran es of the hig er in ulation level

5.5.2 If con u tors swin u der the influen e of s ort-circ it f orces, 5 % of the minimum

cle ran es calc lated with the f ormula of 5.4 s al b maintained as a minimum

5.5.3 If con u tors swin u der the influen e of win , 7 % of the minimum cle ran es

calc lated with the formula of 5.4 s al b maintained as a minimum

5.5.4 In case of rupture of one s b-c ain in a multiple in ulator c ain, 7 % of the

minimum cle ran es calc lated with the formula of 5.4 s al b maintained as a minimum

5.6 Te te conne tion zone

Information on mou tin an service con ition of typ tested eq ipment s p l ed by the

man f acturer s al b o served on site

NOT In te te c n e tio z n s, th minimum cle ra c s a c rdin to 5.4 a d An e A n e n t to b

maintain d b c u e th a i ty to with ta d th te t v lta e is e ta ls e b a diele tric ty e te t

The re ctors are clas ified takin into ac ou t the dielectric in contact with the win in an

the typ of internal or external co l n medium, as des rib d in Clau e 3 of IEC 6 0 6-2:2 1

When desig in the re ctor in tal ation, the p s ibi ty of f ire pro agation (se 8.7) s al b

con idered Simiarly, me n s al b implemented to l mit, if neces ary, the acou tic noise

level (se 4.5.2 of IEC 619 6-1:2 10)

For re ctors in taled in o rs, s ita le venti ation s al b provided (se 7.5.7)

Water (grou d water, s rf ace water an waste water) s al not b p l uted by re ctors

in tal ation This s al b ac ieved by the c oice of the desig of re ctors typ an /or site

provision For me s res, se 8.8

If it is neces ary to take samples (oi sampl n ) or to re d monitorin devices (s c as fluid

level, temp rature, or pres ure), whic are imp rtant f or the o eration of the re ctor whi st the

re ctor is energized, it s al b p s ible to p rf orm this saf ely an without damage to the

eq ipment

Air core re ctors s al b in tal ed in s c a way that the minimum desig mag etic cle ran e

to other re ctors an metal c p rts is fulfi ed to minimize in u ed los es

In general metal c p rts s ould b located where the ef fect of the mag etic field do s not

cau e harmful eff ects

Air core re ctors s al b in tal ed in s c a way that the mag etic field of the s ort-circ it

c r ent wi not b ca a le of drawin o jects into the coi Adjacent eq ipment s al b

desig ed to with tan the res ltin electromag etic forces

Air core re ctors s al b desig ed to prevent hazardou fer omag etic o jects at raction d e

to their mag etic flu den ity Rotational forces may b notice ble a ove 6 mT an cau e

diff i ulty arou d 6 mT Tran lational f orces may b notice ble a ove 10

-4

T2

/m an eq al to

gravity a ove 10

-3

T2

In ulator profi es an /or req irements f or p rorman e of outdo r in ulators in p l uted or

he v wet in con ition may b sp cif ied by the u er