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Modularized signal switching loop

A signal switching and modularization technology, which is applied in the direction of instruments, safety arrangements, control/regulation systems, etc., can solve problems affecting the operation of the working system, and achieve good practicability and reliability, convenient design and construction, and high reliability.

Inactive Publication Date: 2014-11-05
STATE GRID XINYUAN +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is not easy to deal with the normally closed trip signal, because after the normally closed trip signal is switched to the working system, the backup system cannot receive the normally closed signal, causing the backup system to report an error or trip, which will affect the operation of the working system

Method used

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  • Modularized signal switching loop
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Embodiment Construction

[0011] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0012] The invention provides a modularized signal switching circuit,

[0013] Such as figure 1 As shown, KM+ is the positive terminal of the control power supply; KM- is the negative terminal of the control power supply; K1 is the air switch of the control power supply; 1ZJ1 is the switching relay. When the control power circuit breaker K1 is closed and the contacts of "selected working system" or "selected standby system" are closed, the coil of relay 1ZJ1 is excited, and the corresponding contact of relay 1ZJ1 will act.

[0014] Such as image 3 As shown, when the coil of relay 1ZJ is excited, its normally open contacts 1ZJ-4 / 1ZJ-5, 1ZJ-8 / 1ZJ-9, 1ZJ-14 / 1ZJ-15, 1ZJ-18 / 1ZJ-19 will be closed; Its normally closed contacts 1ZJ-2 / 1ZJ-3, 1ZJ-6 / 1ZJ-7, 1ZJ-12 / 1ZJ-13, 1ZJ-16 / 1ZJ-17 will be disconnected.

[0015] Such as figure 2 As shown in ...

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Abstract

The invention discloses a modularized signal switching loop. The modularized signal switching loop is characterized in that a magnetic latching relay is designed in a modularized mode, an operation system will not be influenced if a switching system has a power failure, a spurious signal contact is provided for a back-up system, and the phenomenon that the back-up system sends trouble signals mistakenly and influences the operation system is prevented. A normally open contact and a normally closed contact are uniformly designed in switching. According to the scheme, design and construction are convenient, the reliability is high, and the practicality is good.

Description

technical field [0001] The invention belongs to the field of electrical engineering, in particular to a modularized signal switching circuit. Background technique [0002] There are usually two methods for the working and standby control systems to share a set of input signals. One is re-extension, which is implemented by expanding a signal through relay contacts into two contacts for use by the two systems. However, after the reset signals are sent to the two systems, the intermediate control state of the operating system will often be regarded as an abnormal state by the backup system, which will cause the alarm or protection action of the backup system to interfere with the normal control of the operating system. The other is relay switching, which is implemented by forming a signal switching circuit through relays, and switching the signals to the two systems as needed. However, this method is not easy to deal with the normally closed trip signal, because after the norm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B9/03
Inventor 徐峰吴毅石祥建吴耀富刘为群易承勇沙保卫
Owner STATE GRID XINYUAN
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