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A transformer zero-sequence overcurrent protection method and device

A zero-sequence overcurrent and protection device technology, applied in emergency protection circuit devices, protections that respond to overcurrent, electrical components, etc. 、The effect of avoiding the misoperation of transformer zero sequence overcurrent protection

Active Publication Date: 2021-10-22
河南许继继保电气自动化有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a transformer zero-sequence overcurrent protection method and device for solving the problem of transformer zero-sequence overcurrent protection maloperation

Method used

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  • A transformer zero-sequence overcurrent protection method and device
  • A transformer zero-sequence overcurrent protection method and device
  • A transformer zero-sequence overcurrent protection method and device

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Embodiment Construction

[0029] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] Embodiment of transformer zero-sequence overcurrent protection method:

[0031] The schematic diagram of the main wiring mode of 220kV transformer is as follows: figure 1 As shown, taking the high-voltage side zero-sequence overcurrent protection as an example, the transformer high-voltage zero-sequence overcurrent protection is composed of high-voltage side bus TV1 voltage, high-voltage side current TA1 and high-voltage side neutral point zero-sequence current TA5.

[0032] Based on (but not limited to) figure 1 In the main wiring mode of the 220kV transformer, this embodiment provides a transformer zero-sequence overcurrent protection method, which is mainly used in the transformer protection device of the smart grid, placed in t...

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PUM

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Abstract

The invention relates to a transformer zero-sequence overcurrent protection method and device, comprising: judging whether the zero-sequence overcurrent protection startup judgment is satisfied; if the zero-sequence overcurrent protection startup judgment is satisfied, then judging whether the CT is disconnected; if the CT is not disconnected And the second harmonic content in the neutral point zero-sequence current of the transformer side is greater than the set value of the second harmonic content and the transformer neutral point zero-sequence current waveform is saturated, then the zero-sequence overcurrent on this side is opened after the set time T Protect. The invention can effectively avoid the misoperation of the zero-sequence overcurrent protection of the transformer caused by the excitation inrush current when the transformer is air-dropped and the zero-sequence current when the CT is disconnected, thereby ensuring the safe and stable operation of the power grid.

Description

technical field [0001] The invention relates to a transformer zero-sequence overcurrent protection method and device, and belongs to the technical field of electric power system relay protection. Background technique [0002] Transformer zero-sequence overcurrent protection is used as backup protection for ground faults when the neutral point of the transformer is grounded. The inrush current and the zero-sequence current when the CT is disconnected may cause the zero-sequence overcurrent protection of the transformer to malfunction, affecting the safe and stable operation of the power grid. Contents of the invention [0003] The purpose of the present invention is to provide a transformer zero-sequence overcurrent protection method and device, which are used to solve the problem of transformer zero-sequence overcurrent protection maloperation. [0004] In order to solve the above-mentioned technical problems, the present invention provides a transformer zero-sequence ove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/04H02H3/08
CPCH02H3/08H02H7/04
Inventor 邓茂军倪传坤李宝伟许云龙马和科王智勇李旭李文正陈继瑞吕利娟
Owner 河南许继继保电气自动化有限公司