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Typical Limiting Values of Sub Station Electrical Equipments (2)
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Transcript of Typical Limiting Values of Sub Station Electrical Equipments (2)
7/23/2019 Typical Limiting Values of Sub Station Electrical Equipments (2)
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Typical Limiting Values of Sub Station Electrical Equipments.
1. Transformer / Reactor:
Sr. No. Equipment / test data ermissible limits Reference
A)
Transformer oil
a) BDV
-At the time of first charging 60 kV (Gap – 2. mm) – !inim"m #$ – %&66
-D"ring '! 0 kV (Gap – 2. mm) – !inim"m #$ – %&6
*) !oist"re content #$ – %&6&
-At the time of first charging % ++! (!a,.) #$ – %&6
-D"ring '! 2 ++! (!a,.) #$ – %&0
c) esisti/it at 0 1egree 0.%-%0%2 'hm-! (!in.) #$ – %&%
1) Aci1it 0.2 mg 3'45gm (!a,.) #$ – %&2
e) #T at 2 1egree 0.0%& 75! (!in.) #$ – %&8
f) Tan 1elta at 0 1egree 0.20 (!a,.) #$ – %&9
g) lash point %26 Deg. (!in.) #$ – %&
B)Vi*ration le/el for reactors 200 !icrons (+eak to +eak) #$ – %&6
60 !icrons (A/erage) #$ – %&
) Tan 1elta for *"shing at 20 Deg. 0.00: #; – %8
D) apacitance for *"shing < = /ariation #; – %8&
;) # /al"e for >in1ing%000 !-'hm B .05%0.0 kV
!egger
#; – %8
)Tan 1elta for >in1ings at 20 Deg.
0.00: #;;;5.%2.0.%&0
G)ontact resistance of *"shing
terminal connectors
%0 !. 'hm 5 onnector
7G.?3 ecommen1atio
4) T"rret 7e"tral T ratio errors 8 #$ – 20
!. "ircuit #rea$ers
Sr. No. Equipment / test data ermissible limits Reference
A) De> point of $6 gasDe> point /al"es as per Anne,"re
– ##
B) De> point of operating air -9 Deg. at AT!. +ress"re
) B 'perating timings 900 kV 2203V
a) losing time (!a,.) %0 !$ 200!$
*) Trip time (!a,.) 2 !$ 8!$
c) lose5trip time@ +ole
1iscrepanc
– +hase to +hase (!a,.) 8.88 !$ 8.88!$
-Break to *reak (!a,.) of same 2. !$ 2.!$
7/23/2019 Typical Limiting Values of Sub Station Electrical Equipments (2)
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phase
D)
+# time
B4; make%2-%6 !$
!an"fact"rers
ecommen1ations
ABB make&-%2 !$
!an"fact"rers
ecommen1ations
7G; make&-%2 !$
!an"fact"rers
ecommen1ations
!G make&-%2 !$
!an"fact"rers
ecommen1ations
T;3 make&-%2 !$
!an"fact"rers
ecommen1ations
ABB make (4VD) &-%2 !$
!an"fact"rers
ecommen1ations
;)
+# opening time prior to opening
of main contacts (ABB@ G@
7G; make Bs) !$ (!in.) at rate1 press"re
!an"fact"rers
ecommen1ations
)
+ir an1 main contacts o/erlap time
B4;@ !G@ ABB (importe1)
make BsC 6 !$ (!in.) at rate1 press"re
!an"fact"rers
ecommen1ations
G) Tan 1elta of gra1ing capacitors 0.00 at 20 Deg.
4) apacitance of gra1ing capacitorsithin < %0= 5 -= of the rate1
/al"e #; 8
#) ontact resistance of B %0 !. 'hm
E)ontact resistance of B terminal
connector %0 !. 'hm per connector 7G@ ?3 recommen1atio
3)
# /al"eF
%. +hase – earth%000 ! 'hm (!in.) * .0 5 %0.0
kV !egger
2. Across open contacts%000 ! 'hm (!in.) * .05%0.0 kV
!egger
8. ontrol ca*les0 ! 'hm (!in.) * 0. kV
!egger
)
+ress"re s>itch settings
-$6 gas press"re s>itches ithin < 0.% Bar of set /al"e
-'perating air pr. $>itches ithin < 0.% Bar of set /al"e
-'perating oil pr. $>itches ithin < 0.% Bar of set /al"e
!)
BDV of oil "se1 for !'B
-At the time of filling 90 kV at 2. mm Gap (!in.) !fgs. ecommen1ation
-D"ring '! 20 kV at 2. mm Gap. (!in.) !fgs. ecommen1ation
%. "urrent Transformer
7/23/2019 Typical Limiting Values of Sub Station Electrical Equipments (2)
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Sr. No. Equipment / test data ermissible limits Reference
A)
# /al"e
%. +rimar – earth%000 ! – 'hm (!in.) * .05%0.0
kV !egger
2. $econ1ar – earth 0 ! – 'hm (!in.) * 0. kV!egger
8. ontrol ca*les0 !-'hm (!in.) * 0. kV
!egger
B) Tan 1elta /al"e 0.00: at 20 Deg.
) Terminal onnector %0 !-'hm per connector
7G@ ?3
ecommen1ations
D) T ratio errors < 8= -+rotection cores #$ – 20
D) T ratio errors < %= -!etering cores #$ – 206
&. "apaciti'e Voltage
Sr. No. Equipment / test data ermissible limits Reference
A) Tan Delta 0.00: at 20 Deg.
B) apacitanceithin <%0=5-= of the rate1
/al"e #; – 8&
ontact resistance of terminal
connector %0 !-'hm per connector
7G@ ?3
ecommen1ations
D)
# Val"e # Val"e
%. +rimar – earth %000 ! – 'hm (!in.) * .05%0.0kV !egger
2. $econ1ar – earth0 ! – 'hm (!in.) * 0. kV
!egger
8. ontrol ca*les0 !-'hm (!in.) * 0. kV
!egger
;)
;!? tank oil parameters ;!? tank oil parameters
a) BDV (!in.) 80 kV (Gap. –2. mm) #$ – %&66
*) !oist"re content (!a,.) 8 ppm -1o-
c) esisti/it at 0 Deg. 0.% – %0%2 'hm. – ! -1o-
1) Aci1it 0. mg k'4 5gm (!a,.) -1o-
e) #T at 2 Deg. 0.0%& 75! (!in.) -1o-
f) Tan 1elta at 0 Deg. %.0 !a,. -1o-
g) lash point %2 Deg. (!in.) -1o-
) VT /oltage ratio errors < = protection cores #;;;58.%.%0
) VT /oltage ratio errors < 0.= metering cores #; %&6
(. )solators
Sr. No. Equipment / test data ermissible limits Reference
7/23/2019 Typical Limiting Values of Sub Station Electrical Equipments (2)
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A) ontact resistance 800 !-'hm. (!a,.)
B)ontact resistance of terminal
connector %0 ! – 'hm per connector
7G@ ?3
ecommen1ations
)
# /al"e
%. +hase – earth %000 ! – 'hm (!in.) * .05%0.0kV !egger
7G@ ?3ecommen1ations
2. Across open contacts%000 ! – 'hm (!in.) * .05%0.0
kV !egger
7G@ ?3
ecommen1ations
8. ontrol ca*les0 !-'hm (!in.) * 0. kV
!egger
*. Surge +rrester
Sr. No. Equipment / test data ermissible limits Reference
A) eakage c"rrent 00 !-Amp. (esisti/e) 4itachi@ Eapan ecom.
B) # /al"e %000 !-'hm. (!in.) 4itachi@ Eapan ecom.
,. -iscellaneous
Sr. No. Equipment / test data ermissible limits Reference
A) $tation earth resistance %.0 'hm (!a,.)
B)
Thermo /ision scanning
Temp. "p to % Deg. (a*o/e
am*ient) 7ormalTemp. a*o/e %-0 Deg. (a*o/e
am*ient) Alert
Temp. a*o/e 0 Deg. (a*o/e
am*ient) To *e imme1iatel atten1e1
)Terminal connectors – ontact
resistance %0 !-'hm per connector
4G@ ?3
ecommen1ations
D)
# /al"es
%. All electrical motors0 !-'hm (!in.) * 0. kV
!egger
2. ontrol ca*les0 !-'hm (!in) * 0. kV!egger
8. t. Transformers %00 !.-'hm (!in.) * !egger
9. t. $>itchgears%00 ! – 'hm (!in.) * 0. kV
!egger
. #atteries
Sr. No. Equipment / test data ermissible limits Reference
A) Terminal connector resistance %0 ! – 'hm < 20= A7$#5#;;; – 90 %&B) $pecific gra/it %200 < G!5 at 2 Deg.
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Temperature "orrection actor for Tan 0elta -easurement
Sr. No. il temperature 0eg. " "orrection factor234
% %0 0.&
2 % 0.
8 20 %.0
9 2 %.%2
80 %.2
6 8 %.90
90 %.
& 9 %.
0 %.
%0 2.%&
%% 60 2.92
%2 6 2.0
%8 0 8.00
#f Tan Delta of *"shing5>in1ing5VT5T is meas"re1 at oil temperat"re T Deg. . Then Tan
Delta at 20 Deg. shall *e as gi/en *elo>F
Tan 0elta at !5 0eg. " 6 Tan 0elta at Temp T 0eg. " / actor 3.
0e7 oint Limits for S* 8as in E9V "ircuit #rea$ers
Sr.
No
Make of C.B 0e7 point at rated
r. 0eg. "
"orresponding de7 point
at +tmosperic .r. Remar$s
1 BHEL -% -86 At the time of commissioning
- -2 D"ring '!
- -2 ritical
2 M&G – -8 At the time of commissioning
-82 D"ring '!
3 CGL -% -8 At the time of commissioning
-%0 -8% D"ring '!
4 ABB -% -8 At the time of commissioning
- -26 D"ring '!
5 NGEF -% -86 At the time of commissioning
- -2 D"ring '!
Note: Dew point of SF6 ga !a"ie wit# p"e$"e at w#i%# ea$"eent i%a""ie' o$t( So it i to )e en$"e' t#at if ea$"eent i 'one at p"e$"e
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ot#e" t#an atop#e"i% p"e$"e* it nee' to )e %on!e"te' to t#eatop#e"i% p"e$"e(