Abstract
The paper describes a technique for detecting changes in power system currents or voltages. The technique is based upon the calculation of the rate of rise of these quantities at their own zero crossings and is referred to as “current (or voltage) derivative relaying”.The technique emerged from a study of the possible use of digital computers for back-up protection when it is used to detect the failure of a circuit breaker to interrupt the flow of fault current.The technique is found to be suitable also for realisation as a relatively simple electronic circuit.
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