Iec 60143 3 2015

IEC 601 43 3 Edition 2 0 201 5 06 INTERNATIONAL STANDARD NORME INTERNATIONALE Series capacitors for power systems – Part 3 Internal fuses Condensateurs série destinés à être installés sur des réseaux[.]

Series capacit ors for power sy stems –

Part 3: Int ernal fuses

Condensat eurs série dest inés à êt re inst al és sur des réseaux –

Partie 3: Fusibles int ernes

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Series capacit ors for pow er sy st ems –

Part 3: Int ernal fuses

Condensateurs série dest inés à êt re inst al és sur des réseaux –

Partie 3: Fusibles int ernes

W arnin ! Mak e s re th t you o tain d this publc tion from a a thorize distribut or

A tt ention! Veui ez vou a s rer qu vou avez o te u c t te publc tion v ia u distribute r a ré

CONTENTS

FOREWORD 3

1 Sco e 5

2 Normative ref eren es 5

3 Terms an def i ition 5

4 Perf orman e req irements 5

4.1 General 5

4.2 Dis on ectin req irements 6

4.3 With tan req irements 6

5 Tests 7

5.1 Routine tests 7

5.1.1 General 7

5.1.2 Dis harge test 7

5.2 Typ tests 7

5.2.1 General 7

5.2.2 Dis harge test on fuses 7

5.2.3 Dis on ectin test on fuses 8

5.2.4 Voltage test af ter o enin the container 8

An ex A (normative) Test proced res for the dis on ectin test on internal fuses 9

A.1 General 9

A.2 Test proced re – Mec anical pu cture of the element 9

An ex B (informative) Guide for co rdination of fuse protection 10 B.1 General 10 B.2 Protection seq en e 10 Bibl ogra h 1

INTERNATIONAL ELECTROTECHNICAL COMMISSION

Part 3: Internal f uses

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International Stan ard IEC 6 14 -3 has b en pre ared by IEC tec nical commite 3 : Power

ca acitors an their a pl cation

This secon edition can els an re laces the f irst edition publ s ed in 19 8 This edition

con titutes a tec nical revision

This edition in lu es the f ol owin sig if i ant tec nical c an es with resp ct to the previou

edition:

The test proced re has b en largely simpl f ied

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 f ou d in the re ort on

votin in icated in the a ove ta le

This publcation 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 6 14 series, publ s ed u der the general title Series c p citors

for p wer s stems, can b f ou d on the IEC we site

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

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

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

• with rawn,

• re laced by a revised edition, or

SERIES CAPACITORS FOR POWER SYSTEMS –

Part 3: Internal f uses

This p rt of IEC 6 143 a ples to internal fuses desig ed to isolate f aulty ca acitor elements,

to alow o eration of the remainin p rts of that ca acitor u it an the b n in whic the

ca acitor u it is con ected Su h fuses are not a s bstitute f or a switc in device s c as a

circ it-bre ker, or for external protection of the ca acitor b n , or an p rt there f

The o ject of this p rt of IEC 6 14 is:

– to f ormulate req irements regardin p rforman e an testin ;

– to provide a g ide f or co rdination of f use an b n protection

NOT Extern l fu e for s rie c p citors are tre te in IEC 6 14 - :2 0 , An e A: "Te t re uireme ts a d

a plc tio g id for e tern l fu e a d u its to b e tern ly fu e "

The f olowin doc ments, in whole or in p rt, are normatively referen 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 pl es For

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

IEC 6 14 -1:2 0 , Series c p citors for p wer s stems – P art 1: Ge eral

IEC 6 14 -2:2 12, Serie c p citors for p wer s stems – P art 2: P rote tiv e uipme t for

s ries c p citor b n s

For the purp ses of this doc ment, the terms an def i ition contained in IEC 6 14 -1 an

IEC 6 14 -2, as wel as the fol owin , a ply

3.1

rate volta e of a c pa itor eleme t U

Ne

r.m.s value of the alternatin voltage f or whic the ca acitor element has b en desig ed

The fuse is con ected in series with the element s) whic the f use is inten ed to isolate if the

element s) b comes f aulty The ran e of c r ents an voltages f or the fuse is theref ore

de en ent on the ca acitor desig , an in some cases also on the desig of the b n in

whic the fuse is con ected

The o eration of an internal fuse is in general determined by one or b th of the two f olowin

f actors:

– the dis harge energ f rom elements or u its con ected in p ral el with the f aulty element

or u it;

– the p wer freq en y fault c r ent

4.2 Dis onn ctin re uireme ts

The fuse s al ena le the f aulty element to b dis on ected when electrical bre k own of

elements oc urs in a voltage ran e, in whic u

1

is the lowest, an u

2

is the hig est

(in tantane u ) value of the voltage b twe n the terminals of the u it at the in tant of f ault

The recommen ed values for u

1

2are the f ol owin :

The u

2value is of a tran ient nature

The u

1

2values a ove are b sed on the voltage that may normal y oc ur acros the

ca acitor u it terminals at the in tant of electrical bre k own of the element

The purc aser s al sp cif y if the u

1value dif f ers from the stated one If so, the value stated

in 3.2.3.1 s al b c an ed ac ordin ly

The u

2value can ot b ex e ded d e to the overvoltage protector A voltage lower than the

4.3.1 Af ter o eration, the ga in the blown f use s al with tan f ul element voltage, plu

an u b lan e voltage d e to f use action, an an s ort-time tran ient overvoltages normal y

exp rien ed d rin the l f e of the ca acitor

4.3.2 Throu hout the l f e of the ca acitor, the fuse s al b ca a le of car yin

contin ou ly a c r ent eq al to or gre ter than the rated ca acitor u it c r ent (in lu in

harmonic if a pl ca le), divided by the n mb r of p ral el fused p th In ad ition, the fuse

s al with tan the workin c r ents given in 7.1 an 10.3 of IEC 6 14 -1:2 0

4.3.3 The fuses s al b ca a le of with tan in the hig -ampl tu e, hig -f req en y

dis harge c r ents d e to o eration of the overvoltage protector an /or the byp s switc ,

exp cted d rin the l fe of the ca acitor

4.3.4 The fuse con ected to the u damaged element s) s al b a le to car y the

dis harge c r ents d e to the bre k own of element s)

4.3.5 The fuse s al b a le to car y the c r ents d e to s ort-circ it faults on the b n

external to the u it s) oc ur in within the voltage range in ac ordan e with 2.2

4.3.6 The f use s al b ca a le of with tan in the hig -ampl tu e, hig -f req en y

dis harge c r ent that wi arise as a con eq en e of a f las over to platf orm fault or a varistor

f ai ure

N), throu h a ga situated as closely as p s ible to the

ca acitor, without an ad itional imp dan e in the circ it

The ca acitan e s al b me s red b f ore an af ter the dis harge test The dif f eren e

b twe n the two me s rements s al b les than an amou t cor esp n in to one internal

f use o eration

The dis harge test may b made b fore or af ter the voltage test b twe n terminals (se 5.5 of

IEC 6 14 -1:2 0 ) However, if it is made af ter the voltage test b twe n terminals, a

ca acitan e me s rement at rated voltage s al b made af terward to detect fuse o eration

It is p rmited that a d.c c argin voltage b generated by initial y energizin with an a.c

voltage of 1,7 U

N

p ak value an dis on ectin at a c r ent zero The ca acitor is then

immediately dis harged f rom this p ak value Alternatively, if the ca acitor is dis on ected at

a sl g tly hig er voltage than 1,7 U

N, the dis harge may b delayed u ti the dis harge

resistor red ces the voltage to 1,7 U

N

5.2 Type te ts

The f uses s al b a le to with tan al typ tests of the ca acitor u it s) in ac ordan e with

IEC 6 14 -1

The u it s) s al have p s ed al routine tests stated in IEC 6 14 -1

The dis on ectin test on fuses (se 3.2.3) s al b p rf ormed either on one complete

ca acitor u it or, at the c oice of the man f acturer, on two u its, one u it b in tested at the

lower voltage l mit, an one u it at the up er voltage l mit, in ac ordan e with 3.2.3.1

NOT Du to te tin , me s rin a d s fety circ msta c s, it ma b n c s ary to ma e s me mo if i atio s to

th u it(s) u d r te t; for e ample th s in ic te in An e A Se als th difere t te t meth d giv n in

Typ tests are con idered val d if they are p rf ormed on ca acitor(s) of a desig identical with

that of the ca acitor of f ered, or on a ca acitor(s) of a desig that do s not dif fer from it in an

way that mig t af fect the pro erties to be c ec ed by the typ tests

5.2.2 Dis harge te t on f us s

The fuses s al b s bjected to the dis harge test stated in 5.13 of IEC 6 14 -1:2 0

To prove that the fuses have not o erated, a ca acitan e me s rement s al b made b f ore

an af ter the test A me s rin method s al b u ed that is s f f iciently sen itive to detect the

ca acitan e c an e cau ed by one blown fuse

5.2.3 Dis onn ctin te t on f us s

The dis on ectin test on fuses s al b p rformed at the lower a.c test voltage of 0,5 × U

N,

an at the up er a.c test voltage of 1,1 × U

lm, where 1,1 is a test factor The tests may b

p rformed on two dif ferent u its, one f or e c level

NOT 1 For th u p r a.c te t v lta e, th dis h rg e erg of p ralel eleme ts wi n rmaly blow th fu e,

wh re s at th lower a.c te t v lta e, a p wer re u n y c r e t is n rmaly re uire to blow th fu e

Certain test method are in icated in An ex A

If the test is car ied out with d.c the test voltage s al b 2 times the cor esp n in a.c

test voltage

NOT 2 Normaly th diele tric wo ld o ly with ta d a v lta e of 2.5 U

N

for a v ry lmite p rio of time

Th refore a te t with d.c is in mo t c s s to b prefere

NOT 3 If th te t is c rie o t with a.c th trig erin of th eleme t faiure with a v lta e p a wi n t b

n c s ary for th te t at th lower v lta e lmit

NOT 4 Th v lta e u state in 2.2 is th ma imum v lta e th t th u it c n b e p s d to d rin s rvic

Howe er th dis o n ctin te t is p rorme at 1,1 time th t v lta e

Af ter the test, the ca acitan e s al b me s red to prove that the fuse(s) has (have) blown

A me s rin method s al b u ed that is s f f iciently sen itive to detect the ca acitan e

c an e cau ed by one blown f use

5.2.3.3 Inspe tion of th unit

No sig if i ant def ormation of the container s al b a p rent

Af ter o enin the container, a c ec s al b made to en ure that at lower an up er voltage

l mit:

a) no severe def ormation of sou d f uses is a p rent;

b) no more than one ad itional f use (or one-tenth of f used elements directly in p ralel) has

b en damaged (se Note 1 of Clau e A.1)

NOT 1 A smal amo nt of bla k nin of th impre n nt wi n t af fe t th q alty of th c p citor

NOT 2 Da g ro s tra p d c arg s ma b pre e t o eleme ts dis o n cte eith r b o erate fu e or b

d ma e to th ir c n e tio s Al eleme ts wi b dis h rg d with gre t c re

5.2.4 Volta e te t af ter ope ing the container

A d.c test voltage eq al to 1,7 × U

lm

s al b a pled for 10 s acros the broken-down

element an the ga in its blown fuse Durin the test, the ga s al b in the impreg ant

No bre k own over the f use ga or b twe n an p rt of the fuse an an other p rt of the u it

is al owed

The test can b re laced by an a.c test b fore o enin of the u it The test voltage b twe n

the terminals is calc lated u in the ca acitan e ratio s c that the voltage acros the

bre k own element an the ga in its blown fuse is the value given in 3.2.4, divided by

2

Annex A

(normative)

Test procedures f or the disconnecting test on internal f uses

The test proced re des rib d in A.2 or an alternative method agre d up n b tween the

man facturer an the purc aser, s al b u ed

If no agre ment has b en re c ed, the c oice is lef t to the man f acturer: se also the note

in 3.2.1

The ca acitor voltage an c r ent s al b recorded d rin the test to verif y that the f use has

dis on ected cor ectly

To verif y the c r ent-lmitin b haviour of the f uses when tested at the up er voltage lmit, the

voltage dro , ex lu in tran ient, acros the blown f use s al not ex e d 3 %

If the f use do s not f ulf il this req irement, precaution s al b taken to make certain that the

p ral el stored energ an the p wer f req en y f ault c r ent avai a le from the s stem are

re resentative of service con ition A test s al then b made to demon trate the satisf actory

o eration of the fuse

At the up er voltage l mit, one ad itional fuse (or one-tenth of the f used elements directly in

p ral el) con ected to a sou d element s) is al owed to b damaged

The test voltage s ould b maintained some secon s af ter a bre k own, to en ure that the

f use has dis on ected cor ectly, u aided by dis on ection of the p wer s p ly

Precaution s ould b taken when p rformin this test again t the p s ible explosion of a

ca acitor u it an the explosive projection of the nai

Co rdination of the element faiure with an a.c voltage p ak is not neces ary for the test at

the lower voltage lmit

A.2 Test procedure – Mecha ical puncture of the element

Mec anical pu cture of the element is made by a nai , whic is forced into the element

throu h an o enin in the container The test voltage may b d.c or a.c the c oice b in lef t

to the man facturer

If an a.c voltage is u ed (at the hig dis on ection voltage u2), ca acitor c r ent s al b

recorded d rin the test an the timin of the pu cture s al b made, to as ertain that the

bre k own is trig ered to take place at the in tant of the p ak of the a.c test voltage, or very

close to it

NOT 1 Pu cture of o ly o e eleme t c n ot b g ara te d

NOT 2 In ord r to lmit th p s ibi ty of a fla h v r to th c ntain r alo g th n i or thro g th h le c u e

b th n i th p n ture wi b p rorme in th eleme ts c n e te , p rma e tly or d rin th te t, to th

c ntain r

NOT 3 DC v lta e is e p cialy s ita le for c p citors h vin al eleme ts in p ralel

Annex B

(inf ormativ )

Guide f or coordination of f use protection

The f use is con ected in series with the element that the fuse is desig ed to isolate if the

element b comes f aulty Af ter the bre k own of an element, the fuse con ected to it wi blow,

an isolate it f rom the remainin p rt of the ca acitor, whic al ows the u it to contin e in

service

The stres es on the f use wi de en on the ratin of the ca acitor u it, the n mb r of p ral el

con ected u its, con ection (if an ) b twe n p ral el u its, etc

The blowin of one or more f uses wi cau e c an es of the voltage distribution an the

c r ent distribution within the b n

The voltage acros sou d u it s) s ould not ex e d the value given in IEC 6 14 -1

De en in on the internal con ection of the u its, the blowin of one or more fuses may also

cau e a c an e of voltage within the u it

The remainin elements in a series group wi have an in re sed workin voltage, an the

man facturer s ould, on req est, give detai s of the voltage rise cau ed by blown fuses

B.2 Protection sequence

The protection of a ca acitor b n s al o erate selectively

The f irst ste is the fusin of the element s)

The secon ste is the relay protection of the b n (e.g overc r ent or u b lan e protection)

The third ste is network or plant protection

In large b n s, an alarm stage may also b u ed

NOT 1 De e din o th o tp t of th b n , th d sig of th rela prote tio etc al th thre ste s are n t

n c s ariy u e in al c p citor b n s

NOT 2 Unle s th f us alwa s blows a a re ult of dis h rg e erg within th v lta e ra g giv n in

cla s 2.2, th ma ufa turer wi pro id th c re t imec ara teristic a d tolera c of th fu e

Bibl ography

IEC 6 0 0-4 6:19 0, I ntern tio al Electrotec nical Vo a ulary – Ch pter 4 6: P ower

c p citors

IEC 6 5 9:2 13, H ig -v lta e fu e for the ex tern l protectio ofs u t c p citors

IEC 6 8 1-4:2 14, Sh nt c p citors for AC p wer s stems h vin a rated v ltag a o e

1 0 0 V – P art 4: I ntern l fu e

IEC 6 9 1-3:19 6, Sh nt c p citors of the n n-s lf-h aln ty e for AC p wer s stems

h ving a rated v lta e u to a d including 10 0 V – P art 3: I ntern l fu e

_ _ _ _ _ _

AVANT-PROPOS 13

1 Domaine d’a pl cation 15

2 Réf éren es normatives 15

3 Termes et déf i ition 15

4 Exigen es relatives au p rforman es 15

4.1 Général tés 15

4.2 Exigen es relatives au section ement 16

4.3 Exigen es con ernant la ten e 16

5 Es ais 17

5.1 Es ais in ivid els de série 17

5.1.1 Général tés 17

5.1.2 Es ai de déc arge 17

5.2 Es ais de typ 17

5.2.1 Général tés 17

5.2.2 Es ai de déc arge s r les f usibles 18

5.2.3 Es ai de décon exion des f usibles 18

5.2.4 Es ai de ten ion a rès ou erture de len elo p 19

An exe A (normative) Procéd res d'es ai p ur l es ai de décon exion des f usibles

internes 2

A.1 Général tés 2

A.2 Méthode d’es ai – Perçage mécaniq e de l élément 20 An exe B (inf ormative) Guide p ur la co rdination de la protection p r f usible 2

B.1 Général tés 2

B.2 Co rdination de la protection 2

Bibl ogra hie 2