Fault identification in electric power transmission systems

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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361 79, G01R 3102

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active

043908357

ABSTRACT:
A method of identifying faults in a polyphase alternating current electric power transmission system wherein determination of the type of fault occurring is effected by monitoring, using analogue techniques, the instantaneous values of quantities derived from superimposed currents and/or voltages arising in the system on occurrence of a fault. Apparatus for carrying out the method is also disclosed.

REFERENCES:
patent: 4063300 (1977-12-01), Paddison et al.
patent: 4261038 (1981-04-01), Johns et al.
patent: 4272816 (1981-06-01), Matsumoto et al.
patent: 4281386 (1981-07-01), Kondow et al.
Chamia et al., Ultra High Speed Relay for EHV/UHV Transmission Lines--Development, Design and Application, IEEE Transactions on Power Apparatus & Systems, vol. PAS--97, No. 6, Nov./Dec., 1978, pp. 2104-2112.

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