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A contact resistance detection device for a voltage-type relay protection trip circuit

A technology of tripping circuit and contact resistance, which is applied in the direction of grounding resistance measurement, measuring device, circuit breaker test, etc., and can solve the problem of poor reliability of relay protection tripping circuit

Active Publication Date: 2021-01-26
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present application provides a voltage-type relay protection trip circuit contact resistance detection device, which is used to solve the technical problem of poor reliability of the existing relay protection trip circuit

Method used

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  • A contact resistance detection device for a voltage-type relay protection trip circuit

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Embodiment Construction

[0018] An embodiment of the present application provides a contact resistance detection device for a voltage-type relay protection trip circuit, which is used to solve the technical problem of poor reliability of the existing relay protection trip circuit.

[0019] In order to make the purpose, features and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the following The described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0020] see figure 1 , the first embodiment of the present application prov...

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Abstract

The application discloses a contact resistance detection device for a voltage-type relay protection tripping circuit. Among them, the relay protection tripping circuit contact resistance detection device provided by this application, by adding a detection circuit on the basis of the tripping circuit, and based on the voltage difference between the detection resistor connected to the tripping circuit and disconnected from the tripping circuit, through the pre- The set standard deviation value is compared to obtain the detection result of the contact resistance of the trip circuit, which solves the problem of poor reliability of the existing relay protection trip circuit caused by the inability to measure the contact resistance in time for the existing relay protection device and its secondary circuit technical issues.

Description

technical field [0001] The present application relates to the technical field of relay protection, in particular to a contact resistance detection device for a trip circuit of relay protection. Background technique [0002] In the currently used power system relay protection trip circuit, since the trip outlet pressure plate passes through the trip holding relay coil, and then passes through the circuit breaker position contact to the trip coil, the entire circuit from the protection chamber to the outdoor switch field involves long cables. In the intermediate link, it is difficult to avoid the problem that the contact resistance of the trip circuit increases due to reasons such as secondary cable disconnection, loose terminal block terminals, poor contact of the pressure plate, or equipment aging, which will eventually cause the trip circuit to fail, cause the switch to refuse to move, and may even cause a grid accident. and cause significant economic losses. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327G01R19/165G01R27/20
CPCG01R19/16576G01R27/205G01R31/327G01R31/3275
Inventor 刘玮屠卿瑞黄明辉李一泉王增超
Owner GUANGDONG POWER GRID CO LTD
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