Substation Charging

Dear sir,

we have 110kv substation having three power transformer. the vector group is

Ynd1( 110kv/11kv) other two is Yy0. All three transformer having neutral at 110kv side

and grounded.

we give 11kv at Tr-1( 110kv/11kv) secondary side that time no tripping. we charge second one through same 11okv that time Tr-1 was tripped trough REF & Tr-2 was tripped through the EF. Then we isolate the Tr-2 HV neutral with earth then no tripping was present.

give me advice about this problem, with out N isolation is it not passible.

thanyou,

With Regards,

B.JEYACHANDRAN

CR4 Admin - phone number removed

From the CR4 Rules: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers and email addresses posted in threads or comments. You can share this information via the CR4 internal messaging system.