Square D

Methods of testing circuit breakers:

Read More »Test Micrologic, NT and STR Trip Units with the Square D by Schneider S33595

Protective devices such as relays, overload coils and circuit breakers must be checked on installation and at regular intervals while in service to ensure that they are always ready to operate correctly if a fault should occur in the equipment that they are protecting. Routine testing will quickly detect faulty or incorrectly adjusted protection devices, and possibly prevent serious damage to equipment and injury to personnel. 

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Secondary injection testing normally involves disconnection of the protective device from its normal VT/CT and connection to a specialist test set that can inject and measure/record the required operating signal directly into the protective device relay to cause it to operate the circuit breaker. The advantage of secondary injection testing is that the circuit breaker does not have to interrupt large current and only low voltage signals are injected to operate the device.

Read More »Square D by Schneider S33595, a Full Function Secondary Injection Test Kit

There are several tests for circuit breakers. Primary injection is done by injecting the actual current required to energize the circuit breaker. This test makes the circuit breaker interrupt large currents thus shortening its life. A secondary injection test, on the other hand, is done by injecting a current with the contacts closed but with no current flowing on the poles. This is a better way of testing circuit breakers because it uses low voltage signals that are injected to the circuit breaker which prolongs the operating life.

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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.

Read More »Square D S33595 Secondary Injection Test Set Designed to Perform

Read More »Square D S33595 for Full Function Secondary Injection Testing

Secondary injection testing is normally different to primary injection testing because it is normally conducted when the circuit breaker is closed but is not carrying any current through its main poles.

Read More »Full Function Testing with the Square D S33595 Secondary Injection Test Set