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Run Secondary Injection Tests on Trip Units with the Square D S33595

SquareD_S33595The most typical protective devices installed are overload, over current, reverse power, earth fault, differential proportion etc. Injection tests are carried out to check the operation of these protective relays and the breakers. There are two types of injection tests that are normally conducted – primary injection test and secondary injection test. Primary injection test is conducted by injecting the current that is required for the operation of the protective device power through a circuit breaker. The secondary injection test, on the other hand, is conducted when the circuit breaker, though closed is not carrying any current through the main poles.

In secondary injection tests, the protective relay is first disconnected from its normal voltage or current terminal, and is connected to a secondary injection test unit that is capable of injecting as well as recording the operating signal. This signal is fed directly into the protective device or relay to cause the subsequent operation of the circuit breaker.

Secondary injection tests are generally preferred as there is no need for the circuit breaker to interrupt large current and only voltage signals that are sufficiently low are injected into the device.

A full function test kit, the Square D by Schneider S33595 Secondary Injection Test Set is designed to perform tests on Micrologic, NT and STR Trip units.

The Square D by Schneider S33595 consists of a signal-injection box which can be used alone or with a supporting personal computer (PC). The optional test kit software is compatible with Windows® 95, 98 and Windows NT® operating systems.

Square D S33595 Trip Unit Compatibility


Related electrical test equipment available for rent from Protec:

ABB TS3 Trip Unit Test Set

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Utility Relay Co. B-292 Secondary Injection Test Set

Eaton Cutler Hammer 70C1056G52 Functional Test Kit

This electrical test equipment is available for rent, lease, or purchase from Protec Equipment Resources. We are here to help you with your testing equipment needs.

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