JPS5841020U

JPS5841020U - power plant protection device

Info

Publication number: JPS5841020U
Application number: JP13375181U
Authority: JP
Inventors: 赤木　一夫
Original assignee: 三菱電機株式会社
Priority date: 1981-09-08
Filing date: 1981-09-08
Publication date: 1983-03-18

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図は発電所の所内回路構成を示す図、第２図は従来
の低圧所内母線切替え保護インタロックを示す図、第３
図はこの考案の一実施例を示す図である。４は高圧所内母線、６Ａと６ＢはＡ系とＢ系の動力変圧
器、６Ｃは共通動力変圧器、７Ａと７ＢはＡ系とＢ系の
動力変圧器２次しゃ断器、７Ｃは共通動力変圧器２次し
ゃ断器、８Ａと８ＢはＡ系とＢ系の低圧所内母線、８Ｃ
は共通低圧母線、９Ａと９８はＡ系とＢ系の低圧連絡し
ゃ断器、Ｔはタイマー、ＮＯＴ　ｌ〜ＮＯＴ　３はノッ
ト回路、ＡＮＤ　ｌ〜ＡＮＤ　３はアンド回路、ＯＲ１
〜ＯＲ３はオア回路である。Figure 1 is a diagram showing the in-station circuit configuration of a power plant, Figure 2 is a diagram showing a conventional low-voltage station bus bar switching protection interlock, and Figure 3 is a diagram showing the internal circuit configuration of a power station.
The figure shows an embodiment of this invention. 4 is the high voltage station busbar, 6A and 6B are the power transformers of A system and B system, 6C is the common power transformer, 7A and 7B are the power transformer secondary breakers of A system and B system, 7C is the common power transformer Secondary circuit breaker, 8A and 8B are low voltage station busbars of A system and B system, 8C
is a common low voltage bus, 9A and 98 are low voltage communication breakers for A system and B system, T is a timer, NOT l to NOT 3 are NOT circuits, AND l to AND 3 are AND circuits, OR1
~OR3 is an OR circuit.

Claims

[Scope of utility model registration request]

(1) A relay that is equipped with two low-voltage station circuits connected to the high-voltage station bus and one low-voltage common circuit, and that each low-voltage station circuit detects a failure in the power transformer inside the station; a power transformer secondary breaker that is tripped during operation; and a low voltage communication breaker that closes during operation of the power transformer secondary breaker to connect each of the low voltage station circuits to the low voltage common circuit; In a protection device for a power plant in which a timer is provided between both low voltage communication circuit breakers in order to operate one of the two systems with priority over the other, a circuit that bypasses the timer is used to detect an accident on the bus bar in the high voltage station. A power plant protection device characterized by being inserted between a relay and a low-voltage communication breaker of lower priority.

(2) The circuit that bypasses the timer consists of an AND circuit,
One input terminal is connected to the input side of the timer, the other input terminal is connected to the fault detection relay of the high-voltage station busbar via a knot circuit, and its output terminal is connected to the priority order relay via an OR circuit. A protection device for a power plant according to claim 1, which is connected to a lower low voltage communication breaker.

(3) The protection device for a power plant according to claim 1 or 2, wherein each low-voltage station circuit includes a low-voltage station bus, and the low-voltage common circuit includes a common low-voltage bus.