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Power transformer protection with distance relays

Power transformer protection with distance relays

Power transformer protection with distance relays

(OP)
Distance relays have been proposed as backup relays for transformer protection, primary protection being Differential relays. Any thoughts on
1. what zones / logic should be used.
2. Some have recommended using POTT schemes. Anybody using this?
3. Ways to mitigate inrush

Thx  

RE: Power transformer protection with distance relays

There are some interesting discussions on inrush mitigation in thread238-235674: Transformer Inrush.
Why use distance relay as back up for transformer protection? Why not 50/51 and distance relays for your transmission lines?
 

RE: Power transformer protection with distance relays

(OP)
Basically for the following, probably only one of which may not be possible with a 50/51
a. High speed protection with POTT
b. Breaker Failure
c. Bus backup with either reverse zone or far looking forward

opmgr1,
By mitigating inrush, i meant logic/ways etc. in a relay to inhibit it from tripping on an inrush, but still keeping the protection on for any failures on energization etc.
 
Thanks

RE: Power transformer protection with distance relays

Hi.
Usually 21 function used as back-up protection for the generator-trafo units.
We hade here some thread on the topic.
But with "zero" time it protect only 75% of trafo, second zone not so fast, you need selectivity with other protection.
for the transmission or distribution trafos, 21 is unusuall protection, but maybe you have block: trafo-line?
Best Regards.
Slava

RE: Power transformer protection with distance relays

(OP)
Thanks for your replies. I am researching more on this. I shall let know when i find out more.

RE: Power transformer protection with distance relays

There is some information in the D30 Manual (GE Multilin) on this application.

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