Answer / shailesh taware

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

Answer / rakesh

3 ct for metering ,3 ct for protection,3 pt

Answer / priyadharisini

3 nos of CT/PT required

Answer / manjunath kunigal

one set of tertiary winding CT/PT is sufficient for both
metering and protection.

Answer / sandeep

3 CT/1 PT

Answer / senthil kumar

06CT and 03PT'S

Answer / k n naidu

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.

Answer / mubanga mulenga

You need:

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

2) REF - 1 CT

3)SBEF - 1 CT

Answer / vikas chauhan

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.

Answer / d ramesh

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.

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