Disturbance monitoring/fault test evaluation of a directional comparison protection on the UK 400 kV transmission system

The monitoring of disturbances on the UK 400 kV transmission system is described, and the salient features of the response of a previously described directional relay in a noisy substation environment are outlined. The use of the disturbance data in the evaluation and design of the prototype relay is examined. Information is given on the performance of the relay during high-level disturbances resulting from faults. The results obtained using two such relays in a directional comparison scheme during staged fault throwing tests on the UK 400 kV system are reported.<
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