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A current-type relay protection trip circuit contact resistance detection device

A technology of tripping circuit and contact resistance, applied in the direction of grounding resistance measurement, measuring device, measuring current/voltage, etc., can solve problems such as poor reliability

Active Publication Date: 2021-01-26
GUANGDONG POWER GRID CO LTD +1
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  • Description
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Problems solved by technology

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

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  • A current-type relay protection trip circuit contact resistance detection device

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Embodiment Construction

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

[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 emb...

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Abstract

The invention discloses a current type relay protection tripping circuit contact resistance detection device and provides a relay protection tripping circuit contact resistance detection device. A detection loop is added on the basis of a tripping loop; based on the current difference between the detection resistor and the tripping circuit and the current difference between the detection resistorand the tripping circuit, the detection result of the contact resistance of the tripping circuit is obtained through comparison with the preset standard deviation value, and the technical problem thatan existing relay protection tripping circuit is poor in reliability due to the fact that the contact resistance cannot be measured in time through an existing relay protection device and an existingsecondary circuit is solved.

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): G01R31/327G01R27/20G01R19/165
CPCG01R19/16571G01R27/205G01R31/327G01R31/3275
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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