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Question
11kv/0.433kv, 2 mva , transformer , for protection and 
metering how many CT/PT are required?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
1 CT WITH 3 CORE
1st CORE FOR O/C & E/F PROTECTION
2nd CORE FOR METERING WITH INSULATION CLASS 0.5
3rd CORE FOR DIFFERENTIAL PROTECTION
1 PT WITH 2 CORE
1st CORE FORE O/C & E/F PROTECTION
2nd CORE FORE METERING
 
Is This Answer Correct ?    10 Yes 3 No
Shailesh Taware
 
Answer
# 2
3 ct for metering ,3 ct for protection,3 pt 
Is This Answer Correct ?    11 Yes 5 No
Rakesh
 
 
 
Answer
# 3
one set of tertiary winding CT/PT is sufficient for both
metering and protection.
 
Is This Answer Correct ?    11 Yes 7 No
Manjunath Kunigal
 
Answer
# 4
3 nos of CT/PT required 
Is This Answer Correct ?    6 Yes 3 No
Priyadharisini
 
Answer
# 5
3 CT/1 PT 
Is This Answer Correct ?    5 Yes 4 No
Sandeep
 
Answer
# 6
06CT and 03PT'S 
Is This Answer Correct ?    3 Yes 2 No
Senthil Kumar
 
Answer
# 7
hi,
one three phase set of PTs for both protection & metering
and one three phase set of CTs with two secondary cores one
for metering and protection are required.
 
Is This Answer Correct ?    1 Yes 0 No
K N Naidu
 
Answer
# 8
You need:

1)Inst., o/c, Metering & EF - 3 CT's

2) REF - 1 CT

3)SBEF - 1 CT
 
Is This Answer Correct ?    1 Yes 0 No
Mubanga Mulenga
 
Answer
# 9
3 no CT (Double core) for 11 kv side for protection and
metering
3 no CT (Double core) for 0.433 kv side for protection and
metering
11/.110 KV 3 phase PT for 11 KV side
secondry side(.433KV side) phase directly connected for
Metering & select relays for .433 KV secondry voltage.
if you select differencial rotection
3 nos CT for Primary and 3 No CT for Secondry side and
interposing CT for Match and neutralise the current in
relay.
 
Is This Answer Correct ?    1 Yes 0 No
Vikas Chauhan
 
Answer
# 10
11KV side(delta)
Line side 3core CT :1No. for metering, O/C&E/F protection,
Differential protection with ICT.

0.433KV(Star)
Nuetral CTs :1core for Standby E/F 5p20
Line CTs :3core CT:1No for metering, O/C&E/F
protection,Differential protection with ICT.

1No. 1-core CT in LV nuetral of Transformer of class 5P20
for earth fault protection.

panel side in the panel itself remaining CTs can be
provided for metering, O/C&E/F, and differential cores with
ICT. In both HV panel & LV panel.
 
Is This Answer Correct ?    2 Yes 1 No
D Ramesh
 

 
 
 
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