Single phase earthed relay protection device

A relay protection device, single-phase grounding technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as insensitivity and failure

Inactive Publication Date: 2011-04-27
TSINGHUA UNIV
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Problems solved by technology

[0008] In view of this, the technical problem to be solved by the present invention is to provide a single-phase grounding relay protection device, whic

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[0032] In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, therefore, the present invention is not limited to the specific embodiments disclosed below limit.

[0034] figure 1 A block diagram of a single-phase grounding relay protection device according to an embodiment of the present invention is shown.

[0035] Such as figure 1 As shown, the single-phase grounding relay protection device 100 according to the embodiment of the present invention includes: a signal acquisition module 102, which is used to collect the current transient traveling wave and vol...

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Abstract

The invention provides a single phase earthed relay protection device, comprising a signal acquisition module, a signal processing module, a fault judging module, a releasing module and a power supply module, wherein the signal acquisition module is used for acquiring current transient state traveling waves and voltage transient state traveling waves of a line; the signal processing module is used for respectively acquiring a wave head polarity of a current transient state traveling wave modulus and a wave head polarity of a voltage transient state traveling wave modulus from the current transient state traveling waves and the voltage transient state traveling waves; the fault judging module is used for comparing the wave head polarity of the current transient state traveling wave modulus with the wave head polarity of the voltage transient state traveling wave modulus, which are acquired by the signal processing module, and determining that a single phase earthed fault is generated when the two wave head polarities are opposite; the releasing module is used for release the output of the fault judging module; and the power supply module is used for supplying power for the single phase earthed relay protection device. Through the technical scheme in the invention, the defects that the traditional protection method of the non-effectively earthed neutral system is insensitive or disabled due to unobvious single phase earthed fault phenomena is overcome, and the sensitivity and the reliability of single phase earthed relay protection are improved.

Description

technical field [0001] The invention relates to power system protection and control technology, in particular to a single-phase grounding relay protection device. Background technique [0002] The neutral point of the domestic power distribution system mostly adopts the neutral point ungrounded system and the neutral point grounded system through the arc suppression coil. When single-phase grounding occurs in this system, the voltage of the grounded phase decreases and the voltage of the non-grounded phase increases. At the same time, since the system can only form a loop through the ground capacitance, the capacitance reactance of the ground capacitance is relatively large, resulting in a very small fault current, which will not affect the normal power supply to users, and will not pose a direct threat to the safe operation of the system. China's "Power Equipment Overvoltage Protection Technical Regulations" stipulates that when the neutral point non-effectively grounded s...

Claims

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Application Information

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IPC IPC(8): H02H3/32G01R31/08
Inventor 施慎行董新洲王珺
Owner TSINGHUA UNIV
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