Title :
Experience of numerical protective relays operating in an environment with high-frequency switching surge in Japan
Author :
Matsumoto, Toshio ; Kurosawa, Yasuhiro ; Usui, Masaji ; Yamashita, Koji ; Tanaka, Taisei
Author_Institution :
Power Syst. Control Dept., Fuji Electr. Syst. Co. Ltd., Tokyo, Japan
Abstract :
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.
Keywords :
gas insulated substations; relay protection; reliability; substation protection; surge protection; Japan switchyards; gas insulated substation; high-frequency switching surge; numerical protective relays; switching surge; Control systems; Gas insulation; Immunity testing; Impulse testing; Power industry; Power system relaying; Protective relaying; Relays; Substation protection; Surge protection; Countermeasures against switching surge; Japanese electric utilities; immunity test standard; numerical relay; relay failure due to switching surge; surge immunity;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2005.852363