JPS5830878U

JPS5830878U - Internal failure detection device for electrical equipment

Info

Publication number: JPS5830878U
Application number: JP12580881U
Authority: JP
Inventors: 那須　広実
Original assignee: 三菱電機株式会社
Priority date: 1981-08-24
Filing date: 1981-08-24
Publication date: 1983-02-28

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来の電気機器の内部故障検出装置を示す単線
接続図、第２図は第１図の三線接続図、第３図はこの考
案の一実施例による電気機器の内部故障検出装置を示す
三線接続図である。１・・・開閉器、２・・・電気機器、３・・・比率差動
継電　　　′器、４ａ、　４ｂ、　５．７−・・第１、
第２、第３、第４の計器用変流器、６・・・固定子巻線
、８・・・補助計器用変流器、９・・・電流継電器。な
お、図中同一符号は同−又は相当部分を示す。Fig. 1 is a single-line connection diagram showing a conventional internal fault detection device for electrical equipment, Fig. 2 is a three-line connection diagram of Fig. 1, and Fig. 3 shows an internal fault detection device for electrical equipment according to an embodiment of this invention. FIG. 1...Switch, 2...Electrical equipment, 3...Ratio differential relay, 4a, 4b, 5.7-...1st,
2nd, 3rd, and 4th instrument current transformers, 6... stator winding, 8... auxiliary instrument current transformer, 9... current relay. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims

[Scope of utility model registration request]

In an internal fault detection device for an electrical device that detects an internal fault by installing a current transformer on the primary and secondary sides of an electrical device that has a three-phase internal structure, two of the three phases are detected. A first and second instrument current transformer arranged on the primary side, a third instrument current transformer arranged on the secondary side of the remaining one phase, and a first instrument current transformer arranged on the secondary side of the remaining one phase.
, a common current relay disposed between the primary side and the secondary side of the second and third instrument current transformers, and a common current relay disposed between the primary and secondary sides of the second and third instrument current transformers; a fourth instrument current transformer disposed on the next side; an auxiliary instrument current transformer disposed between the secondary side of the first instrument current transformer and the current relay; Internal failure detection of an electrical device characterized by having a fourth instrument current transformer and a common ratio differential relay disposed between the primary side and the secondary side of the auxiliary instrument current transformer. Device.