Application Note: How to test negative sequence over-current protection using the SVERKER900

Megger Application Note: SVERKER900 - Testing Negative Sequence Overcurrent Protection

Looking at how to test negative sequence over-current protection using the SVERKER900 relay and substation test system.

Unbalance phase currents in a power system that exceed the allowable normal operation limit can indicate abnormal condition or even existence of fault(s) in the system. The operating principal unbalance over current protection is normally based on measurement of negative sequence component of unbalance phase currents. Similar to phase over current protection, normally a pick up (start) threshold and a definite time delay for operation can be set.

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