Transformer trips ,After recommissioning of Differential relay in YNd1 Transformer Protection panel. What are the probable reason ?

Question

Aneesh Shandilya · Answer

The probable reasons are:

1) Real Fault in transformer

2) Wrong connections of CTs

3) Wrong configuration of the relay

You need to carry out following:

1) Test the transformer for its healthiness

2) Carry out stability test for diffenrential protection circuit to investigate the discrepancy, which is leading to trip.

Shankar Kumar · Answer

INRUSH CURRENT AND DIFFERENTIAL PROTECTION CT SATURATION AT HV SIDE

Saad Qamar · Answer

3 Main causes

1. Inrush currents

2. Overexcitation conditions

3.current transformer saturation

alok ranjan · Answer

check for the derived earth fault setting & measured earth faoult with there time setting.

selva raj · Answer

wrong configuration of the Relay

Vonani Given Makamu · Answer

Real fault in transformer

Wrong connection of CTs.

Wrong configuration of the relay.