Importance

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Abstract

A PCM module arrangement includes a three phase circuit breaker and PCM electronics unit. Each phase of the circuit breaker has a Rogowski coil at the line side and load side contacts in a vacuum bottle and another zero sequence current sensor encloses the load side conductors of the circuit breaker to provide a zero sequence current signal. A PCM electronics unit is provided with phase current measurement signals from the Rogowski coils. The PCM electronics unit provides a direct interface for various signals including a signal from a supervisory control and data acquisition system. The PCM electronics unit, combined with the multiple interface connections, permits a set of highly integrated PCM functions to be carried out, enabling the PCM module to selectively respond to both phase and sensitive ground faults when applied to various types of equipment and apparatus in generation and distribution systems which are characterized by distributed architectures and high resistance system grounding with a minimal number of sensors and logic devices. The PCM module also accommodates a wide range of electrical system voltage and frequencies.

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First Claim