maintenance procedure for ehv equipments.doc

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MAINTENANCE TECHNIQUES FOR SWITCHYARD EQUIPMENTS

(CBs, INSTRUMENT TRANSFORMERS, SURGE ARRESTORS

AND ISOLATORS)

1.0 INTRODUCTION

This seci!" #$ie%&' c!e$s he *i"e"*"ce +$*cices

ech"i-.es #ei"/ *0!+e0 #' he +!1e$ .i&iies %!$ s1ich

/e*$ e-.i+e"s i"s*&&e0 i" EH2H2 s*i!"s3 H!1ee$, i"

he +$ese" sce"*$i! c!+eiie *$4e .i&iies *$e ."0e$

$ee"0!.s +$ess.$e ! #$i"/ 0!1" he *i"e"*"ce c!ss3This h*s &e0 ! he *0!+i!" !% c!"0ii!" #*se0 !"i!$i"/

$*he$ h*" c!"e"i!"*& #*se0 sche0.&e0 *i"e"*"ce3 The

%$e-.e"c' !% he c!"0ii!"5#*se0 *i"e"*"ce is %i6e0 #*se0

!" he '+e !% e-.i+e" *"0 is +$ei!.s his!$'3 Tes !$

e*s.$ee"s *$e c*$$ie0 ! 0ee$i"e he c!"0ii!" !% he

e-.i+e"3 I is /e"e$*& e6+e$ie"ce !% +$*cic*&&' *&& he

.i&iies h* !s !% he e-.i+e" 0!" sh!1 *"'

*#"!$*&i' 0.$i"/ sche0.&e0 *i"e"*"ce *"0 he$e is "!

/.*$*"ee h* he e-.i+e" sh*&& "! %*i& #e%!$e he "e6

sche0.&e *i"e"*"ce3 Th.s, he sche0.&e0 *i"e"*"ce

e%%!$s *$e i" *i" *s 1e&& *s c!s&' i" ie1 !% sh.50!1" ie

*"0 *"+!1e$ c!ss3 He"ce !0e$" c!"0ii!" #*se0

ech"i-.es *$e #ei"/ *0!+e0 1hich *$e 0esi/"e0 !

c!"i".!.s&' !"i!$ he %."ci!" +*$*ee$s *"0 *&s!

*ssess he c!+!"e"s 0ee$i!$*i!" #e%!$e * *&5!+e$*i!"

!cc.$s3

1


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2.0 MAINTENANCE TECHNIQUES

The *i"e"*"ce ech"i-.es ! #e *0!+e0 sh!.&0 ee he

%!&&!1i"/ c$ie$i*7

Fie&0 s*%% sh!.&0 #e *#&e ! c*$$' !. s.ch ess *"0

i"e$+$e he es $es.&s

Tesi"/ +$!ce0.$e ! #e e!&e0 *%e$ 0e*i&e0

0isc.ssi!"s 1ih he s.++&ie$ !% he e-.i+e" *"0

esi"/ e-.i+e"

Re.$" 0!1" +$!ce0.$e ! #e *0e **i&*#&e ! he

!+e$*i"/ s*%%3.0 GENERAL CHECKS / MAINTENANCE INSPECTION

The e-.i+e" sh!.&0 #e i"s+ece0 * he $e/.&*$ i"e$*& *s

+e$ he /.i0e&i"es /ie" i" Seci!" 83 I" *00ii!" he

*".%*c.$e$ /.i0e&i"es sh!.&0 *&s! #e %!&&!1e03 The

/e"e$*& chec4s "!$*&&' $e-.i$e0 ! #e 0!"e *$e7

Ge"e$*& c&e*"i"/ 9 c&e*"i"/ !% *&& i"s.&*!$s !%

CBCTC2TIs!&*!$s %!$ s*&0i$ 0e+!sii!", i% *"'3

D.s +$!eci!" 9 ee" h!./h he !+e$*i"/

ech*"is *$e *0e !% see& *"0 s.$%*ce $e*e0, si&&

s!e $.si"/ *' *4e +&*ce3 I% *"' $.s s*i"s *$e

!#se$e0 he s*e *' #e c&e*"e0 1ih ee$' +*+e$

*"0 +*i" he s*e */*i"s he $.s +$!eci!"3 F!$

+$!eci!" */*i"s $.s, /$e*se G !$ ec'& :;< is

s.//ese03

Ti/h"ess chec4 9 A he ie !% %.ss i"s+eci!", *&&

#!&e0 =!i"s !" he #$e*4e$ *"0 !+e$*i"/ ech*"is

2


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sh*&& #e i/he"e0 .+3 A&& he 1i$i"/ =!i"s i" he

e$i"*& #!6 !% he !+e$*i"/ ech*"is sh*&& #e $e5

i/he"e0 * he $e/.&*$ i"e$*&s3 Re5i/he"i"/ h*s !

#e $e+e*e0 !"&' *%e$ #i//e$ !e$h*.&s3 A"' SF


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5 A&.i". c!"*c s.$%*ces sh!.&0 #e c&e*"e0 1ih

see& #$.sh *"0 ee$' c&!h3 A%e$1*$0s, c&e*" i 1ih

0$' c&!h *"0 *++&' * hi" &*'e$ !% *se&i"e3

M!i"/ c!"*c s.$%*ces

5 Si&e$e07 C&e*"e0 i% "ecess*$', 1ih s!% c&!h *"0

s!&e" ($i5ch&!$! eh*"e)3N! see& #$.shi"/3

5 N!" si&e$e07 C&e*"e0 *s si&e$e0 s.$%*ces, c*" #e

see& #$.she03 A%e$ see& #$.shi"/ he' sh*&& #e

h!$!./h&' c&e*"e0 %$! &!!se +*$ic&es *"0 0.s3

5 L.#$ic*i!"7 L.#$ic*" 5 G$e*se > is *++&ie0 i" * e$'hi" &*'e$ !" he s.$%*ces !% he *&e c!"*c *"0 he

+.%%e$ c'&i"0e$3 The s.+e$%&.!.s /$e*se is c*$e%.&&'

$e!e03

E+'i"/ *"0 $e%i&&i"/ !% SF


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5 G*s s!$*/e i" &i-.i0 !$ /*se!.s +h*se

5 S.ci!"i"/ .+! :; B*$

5 T$*"s+!$*#&e *"0 e*s' ! h*"0&e

O+e$*i!"*& c!"*i"*i!" sh!.&0 #e *#s!$#e0 1ih *

s.i*#&e %i&e$ ."i +$!i0e0 i" he /*s h*"0&i"/ +&*"3 Fi&e$

."i sh!.&0 ee he %!&&!1i"/ c$ie$i*7

5 D.s +*$ic&es *#&e ! #e %i&e$e0 s*%e&'

5 M!&ec.&*$ siees %i&e$s $e!e h.i0i' *"0 SF

maintenance procedure for ehv equipments.doc

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