Differential Protection

I restraint is internal computation in the relay.

For testing the relay, you need to do the following :

Inject current on primary side ( 3 currents)

Inject the same on secondary side.

You have to set up current as per the actual transformer arrangement ( ratio and phase displacement ) in order to :

=> verify stability of the relay (no trip is all 6 currents are within the limit)

=> test tripping ( when 6 current are not in line, so that you simulate fault in-zone)

Hope this help you.

BR.

Thx for the response,

I want to use the menu from the DRTS as it can provide the complete graph (m1, m2, etc). Does it mean that I can only test it with manual procedure as you described?

Regards.

What is the final aim of your test :

=> checking CT are properly wired ?

=> TRIP loop checking ?

=> Alarm annunciator testing ?

=> cheching the complete characteristic of the relay ?

As tou said commissioning, I assume you are testing the relay on site, prior to energisation.

In such case, testing the full caracteristic is not what should be done .

you should focus on :

- CT wiring ( i.e stability)

- tripping loop

BR.

Dear BR,

All but most important aim is check functionality of relay according to setting.

So after testing we should insure about relay operation if any thing happen wrong.

ya, I am agree with you but these all point all important only in installation time.