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

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Question added by Himadri Roy , MANAGER ELECTRICAL , STEAG ENERGY SERVICES
Date Posted: 2018/01/07
Aneesh Shandilya
by Aneesh Shandilya , Manager/ Lead Electrical , Orpic

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
by Shankar Kumar , Senior Testing and commissioning Engineer , ENGSOL

INRUSH CURRENT AND DIFFERENTIAL PROTECTION CT SATURATION AT HV SIDE

Saad Qamar
by Saad Qamar , Electrical Technician , SAKA

3 Main causes

1. Inrush currents

2. Overexcitation conditions

3.current transformer saturation

 

alok ranjan
by alok ranjan , Electrical & Instrumentation Engineer , SHYAM STEEL INDUSTRIES LTD

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

selva raj
by selva raj , M/s. EDAC Automation ltd

wrong configuration of the Relay

Vonani Given Makamu
by Vonani Given Makamu , Senior Electrical Technician , SASOL LTD

Real fault in transformer

Wrong connection of CTs.

Wrong configuration of the relay.

 

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