Abstract
The algorithm of a digital device for solving the problem of long-range backup of protection and breaker failures in 0.4-kV grids and simultaneous reduction of the setting for actuation of the protection of the transformers and generators feeding the grids is considered. Recommendations are given for choosing the actuation settings. The device has been tested under conditions close to field ones. The economic effect consists in prevention of fires due to fault-initiated protection failures and durable disabling of substations for repair works.
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REFERENCES
On Protections from Interphase Faults on 6_0.4 kV House Transformers for TPP and NPP. Instruction No. 2768-E [in Russian], Atomteploélektroproekt, Moscow (1985).
V. A. Zilberman, Relay Protection of House Grids of Nuclear Power Plants [in Russian], Énergoatomizdat, Moscow (1992).
A. V. Belyaev, Choice of Equipment, Protections, and Cables in 0.4-kV Grids [in Russian], Énergoatomizdat, Leningrad (1988).
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Belyaev, A.V., Edlin, M.A. Long-Range Backup of Protection and Breaker Failures in 0.4-kV Grids. Power Technology and Engineering 36, 373–377 (2002). https://doi.org/10.1023/A:1023295111540
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DOI: https://doi.org/10.1023/A:1023295111540