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Direct-current interference testing device and system

A technology of DC interference and testing equipment, which is applied in the direction of measuring equipment, circuit breaker testing, measuring electricity, etc., can solve problems such as no simulation environment established, major power grid accidents, substation or power plant shutdown accidents, etc., to improve resistance to DC interference The capacity, economic benefits and social benefits are huge, and the effect of ensuring safe operation

Active Publication Date: 2013-07-10
NORTH CHINA GRID +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the interference on the DC secondary circuit is light, it will cause incorrect action due to the relay protection device getting wrong information; if the interference on the DC secondary circuit is heavy, it will cause multiple switches to trip without fault at the same time, resulting in substation failure. Or the power plant is completely shut down, which will cause a major accident in the power grid
[0003] In the existing technology, the research on the anti-interference of relay protection DC system is basically theoretical analysis and derivation, and no special experimental research has been carried out in the laboratory, and no simulation environment for the experiment has been established.

Method used

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  • Direct-current interference testing device and system

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Embodiment 1

[0019] This embodiment provides a DC interference testing device, which includes: a DC positive interface for connecting the positive pole of an external DC power supply; a DC negative pole interface for connecting the negative pole of an external DC power supply; a positive pole interface for the device under test for Connect the positive terminal of the external device under test; the negative terminal of the device under test is used to connect the negative terminal of the external device under test; the cable simulation resistor is connected in series between the DC positive terminal and the positive terminal of the device under test through a test line with a strobe jack , fast contact, equivalent capacitance access point and interference signal access point; the cable simulation resistance and equivalent capacitance access point are connected in series between the DC negative interface and the negative interface of the device under test through a test line with a strobe ja...

Embodiment 2

[0032] Such as image 3 As shown, the DC interference testing system of this embodiment includes: a battery pack 102, a charging device 101, a DC interference testing device 103, and a control device 104; wherein, the charging device 101 is used to charge the battery pack 102; the DC interference testing device 103 includes : DC positive interface, used to connect the positive pole of the battery pack 102; DC negative pole interface, used to connect the negative pole of the battery pack 102; the positive pole interface of the tested equipment, used to connect the positive pole of the external equipment under test 300; the negative pole interface of the tested equipment, Used to connect the negative pole of the external device under test 300; between the positive DC interface and the positive interface of the device under test, there are cable simulation resistors, quick contacts, equivalent capacitance access points and interference signals connected in series through a test li...

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Abstract

The embodiment of the invention provides a direct-current interference testing device and system. The device comprises an direct-current anode interface, a direct-current cathode interface, a tested equipment anode interface and a tested equipment cathode interface; a cable analog resistor, a fast contact, an equivalent capacitor access point and an interference signal access point are connected in series between the direct-current anode interface and the detected equipment anode interface through a testing line with strobe jacks; a cable analog resistor, an equivalent capacitor access point and an interference signal access point are connected in series between the direct-current cathode interface and the tested equipment cathode interface through a testing line with strobe jakes; an equivalent capacitor is connected in series between the equivalent capacitor access point and the ground through a testing line with strobe jacks; an grounded resistor and the fast contact are connected in series between the interference signal access point and an interference source through a testing line with strobe jacks; and the testing lines are connected through connecting sheets. The direct-current interference testing device and system can be used for performing relay protection direct-current interference test detection and improving capacity of tested secondary equipment against direct current grounding and series connection with alternating current.

Description

technical field [0001] The present invention relates to the DC interference testing technology of the electric power system, in particular to the relay protection DC interference test detection technology, specifically a DC interference testing device and system. Background technique [0002] The accidents caused by the relay protection profession in recent years show that the most likely cause of major accidents in the power grid is the problem of the secondary circuit of the relay protection, especially the problem of the DC system of the relay protection. If the interference on the DC secondary circuit is light, it will cause incorrect action due to the relay protection device getting wrong information; if the interference on the DC secondary circuit is heavy, it will cause multiple switches to trip without fault at the same time, resulting in substation failure. Or the power plant is completely shut down, and then causes a major accident in the power grid. [0003] In t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R31/327
Inventor 冯辰虎李钢孙集伟王宁王丰杨心平刘蔚
Owner NORTH CHINA GRID
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