The stability test of a power transformer is a crucial part of the transformer’s protection scheme. It is performed to ensure that the differential relay does not operate under normal conditions, even when load currents are high, and only operates when a fault occurs in its protection zone.
Transformer Differential Protection: This is one of the primary methods for electrically safeguarding transformers. It operates as a unit protection scheme, meaning it responds only if the fault occurs within its designated protection zone. If the fault lies outside this zone, the differential protection should not trigger.
The concept of in-zone faults and out-of-zone faults is employed to differentiate between fault types. Specifically, out-of-zone faults, also known as through faults, require the differential protection scheme to remain stable, meaning it should not operate during through fault conditions.
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