JPH0210738U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図及び第２図はこの考案の地絡検出装置の
それぞれ異なる実施例を示す接続図、第３図及び
第４図はそれぞれ従来の非接地系及び高抵抗接地
系の電気系統に適用された地絡検出装置を示す接
続図である。 図中、１は母線、３は零相変流器、４は負荷、
５及び８はそれぞれ第１及び第２の地絡検出継電
器、５ａは電流巻線、６は接地形計器用変圧器、
７は抵抗器、９は遮断器、１０は電気機器（発電
機）、１１は接地抵抗器、１２は接点、１３はコ
ンデンサ形計器用変圧器である。なお、図中同一
符号は同一または相当部分を示す。 Fig. 1 and Fig. 2 are connection diagrams showing different embodiments of the ground fault detection device of this invention, and Fig. 3 and Fig. 4 are connection diagrams showing the connection diagrams respectively showing the different embodiments of the ground fault detection device of this invention. FIG. 2 is a connection diagram showing a ground fault detection device. In the figure, 1 is the bus bar, 3 is the zero-phase current transformer, 4 is the load,
5 and 8 are first and second ground fault detection relays, 5a is a current winding, 6 is a ground voltage instrument transformer,
7 is a resistor, 9 is a circuit breaker, 10 is an electric device (generator), 11 is a grounding resistor, 12 is a contact, and 13 is a capacitor type voltage transformer. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 母線に遮断器を介して接続され中性点が接地さ
れた電気機器、もしくは、上記母線に接続され中
性点が接地された計器用変圧器を有した電気系統
において、上記母線に接続された負荷の地絡時に
地絡電流を導出する零相変流器と、この零相変流
器の２次側に接続され所定電流値で動作する第１
の地絡検出継電器と、上記零相変流器の２次側に
接続され、上記第１の地絡検出継電器の動作電流
値よりも大きい電流値で動作する第２の地絡検出
継電器と、この第２の地絡検出継電器の動作にと
もなつて閉成され、上記第１の地絡検出継電器の
入力回路を短絡する接点とを備えたことを特徴と
する地絡検出装置。 Electrical equipment connected to the bus bar through a circuit breaker and whose neutral point is grounded, or in an electrical system that has a voltage transformer connected to the bus bar and whose neutral point is grounded, is connected to the bus bar. A zero-phase current transformer that derives a ground fault current when a load has a ground fault, and a first transformer that is connected to the secondary side of this zero-phase current transformer and operates at a predetermined current value.
a second ground fault detection relay that is connected to the secondary side of the zero-phase current transformer and operates at a current value larger than the operating current value of the first ground fault detection relay; A ground fault detection device comprising: a contact that is closed upon operation of the second ground fault detection relay and short-circuits an input circuit of the first ground fault detection relay.