Stability test of transformer

Transformer Stability Test Procedure
OBJECTIVE:
The Purpose of Differential Stability test is to determine the Healthiness of the Differential CT circuits which is protecting the in Zone equipment from actual fault conditions and through fault conditions.
This scheme monitors the fault condition (i.e; In-zone or out-zone) and trips the power circuit accordingly. If the internal fault (In-zone fault) persists can cause much devastated outcome or equipment failure. Thus this scheme is fast acting and protecting the equipment from any internal faults. If the fault is at out-zone the same scheme will not trip.
Thus maintaining the stability of the protection scheme.
VERIFICATION OF DIFFERENTIAL SCHEME Stability:
To verify the Differential CT circuits the following test / methods are adopted,
1. First of all the current generated during the Differential stability test is calculated using the % z voltage and source to feed the current will have to be chosen.
2. Apply the 440 VAC supply from HV side of the Transformer in such way that Primary CT’s are included in the circuit.
3. Short the 3 phase of the Transformer secondary side with sufficient current carrying cable after the secondary CT’s. So by step 2 & 3 Differential CT’s will see the load / fault currents.
4. Differential Relay has to be set as per the required calculated setting values before starting the stability test. (ie: CT Ratio correction factor, Vector Correction factor)
5. Now the secondary currents of Primary & secondary CT’s, Bias currents, Relay currents, Restrain currents, Operate currents can be noted down from the Relay measuring menu. At the stability condition the Primary & secondary currents magnitude and vector should match. No current should pass through the operating coil of the relay (Refer Stability Test Report & Drawings).

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