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
CN102169144BActive Publication Date: 2013-07-10NORTH CHINA GRID +2
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
NORTH CHINA GRID
Publication Date
2013-07-10

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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.
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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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