Conduct Secondary Injection Testing with the Siemens PTS-5

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The 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.

Siemens_PTS-5The Siemens PTS-5 Secondary Injection Test Set is designed for performing secondary injection testing of the Static Trip III (STIII) overcurrent tripping system utilized on the RL breaker. The system is packaged in a self-contained case and requires 120VAC to operate.

The Siemens PTS-5 contains a microprocessor controlled constant current source which enables rapid verification of the performance of the STIII.

The desired test current may be directly entered with a numeric keypad for ease of test configuration. The self-contained, automatically controlled digital timer allows simple verification of the time-current tripping characteristics. The Siemens PTS-5 also provides a regulated DC voltage to allow functional testing of the tripping actuator.

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