JPH0443346U

JPH0443346U -

Info

Publication number: JPH0443346U
Application number: JP8669790U
Authority: JP
Priority date: 1990-08-18
Filing date: 1990-08-18
Publication date: 1992-04-13

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例による配線系統監
視システムの概略的な結線図、第２図は第１図の
実施例における第二のプレアラームリレーの構成
を概略的に示すブロツク図、第３図は第１図の実
施例における警報リレーの構成を概略的に示すブ
ロツク図、第４図は従来の配電系統の概略的な結
線図である。図において、１は交流電源、２は主回路、３ａ
〜３ｅはそれぞれ分岐回路、４ａ〜４ｅはそれぞ
れ負荷、５は主回路しや断器、６ａ〜６ｅはそれ
ぞれ分岐回路しや断器、５０１は第一の変流器、
５０１Ｒ，５０１Ｓ，５０１Ｔは第一の変流器５
０１を構成する各相の変流器、９は第二の変流器
、９Ｒ，９Ｓ，９Ｔは第二の変流器、９を構成す
る各相の変流器、５０２は第一のプレアラームリ
レー、１０は第二のプレアラームリレー、８は警
報装置、１１は分岐回路開路順位判定回路、１２
ａ，１２ｂは分岐回路開閉装置である。なお、各
図中同一符号は同一または相当部を示す。 FIG. 1 is a schematic connection diagram of a wiring system monitoring system according to an embodiment of this invention, FIG. 2 is a block diagram schematically showing the configuration of a second pre-alarm relay in the embodiment of FIG. 1, and FIG. 3 is a block diagram schematically showing the configuration of the alarm relay in the embodiment of FIG. 1, and FIG. 4 is a schematic connection diagram of a conventional power distribution system. In the figure, 1 is an AC power supply, 2 is a main circuit, and 3a
3e are branch circuits, 4a to 4e are loads, 5 is a main circuit circuit breaker, 6a to 6e are branch circuits and circuit breakers, 501 is a first current transformer,
501R, 501S, 501T are the first current transformers 5
01 is a current transformer for each phase, 9 is a second current transformer, 9R, 9S, 9T are second current transformers, 9 is a current transformer for each phase, 502 is a first transformer. Alarm relay, 10 is a second pre-alarm relay, 8 is an alarm device, 11 is a branch circuit opening order determination circuit, 12
a, 12b are branch circuit switching devices. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims

[Scope of utility model registration request]

A main circuit connected to an AC power supply, a plurality of branch circuits branched from this main circuit, a main circuit switch and disconnector provided in the main circuit, and a branch circuit switch and interrupter provided in each branch circuit. in the power distribution system, first and second current transformers connected to the main circuit;
A first pre-alarm relay connected to the output of the first current transformer and a second pre-alarm relay connected to the output of the second current transformer are provided, and the first pre-alarm relay is connected to the main circuit. and operates in response to an output current of the first current transformer corresponding to a main circuit current equal to or greater than a first predetermined value smaller than the rated current of the disconnector;
a second pre-alarm relay receives an output current of said second current transformer corresponding to a main circuit current greater than said first predetermined value but less than said rated current and greater than a second predetermined value; An alarm device that is activated by the output of the first pre-alarm relay, a branch circuit opening order determination circuit connected to the output of the second pre-alarm relay, and a desired branch. A branch circuit switching device is provided in the circuit and connected in series with the branch circuit switch or disconnector and actuated by the branch circuit open order determining circuit, and the branch circuit open order determining circuit is connected to the branch circuit open order determining circuit from the second pre-alarm relay. A power distribution system monitoring system characterized in that the branch circuit switchgear is opened in a predetermined order while output is being output.