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Experience of Numerical Protective Relays Operating in an Environment With High-Frequency Switching Surge in Japan

2005; Institute of Electrical and Electronics Engineers; Volume: 21; Issue: 1 Linguagem: Inglês

10.1109/tpwrd.2005.852363

1937-4208

Takuya Matsumoto, Y. Kurosawa, Masaji Usui, Koji Yamashita, Tsuyoshi Tanaka,

Smart Grid Security and Resilience

This paper intends to provide general information about the experiences of numerical relay operation under many different kinds of surges from switchyards in Japan. The main focus of this paper is to investigate the immunity of numerical relays against a switching surge with relatively high frequency in a gas-insulated substation that is considered to be severe for the relay's correct operation. It is concluded that the reliability of today's numerical relays in Japan against the switching surge is almost sufficient due to the effectiveness of the immunity test standard adopted and countermeasures against the switching surge in Japan.