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Method and device for preventing maloperation of magnetizing inrush current of transformer

A technology of excitation inrush current and transformers, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as traction transformer protection misoperation, traction transformer protection or feeder protection misoperation, etc., and achieve short judgment time and fast prevention Effects of malfunction and prevention of malfunction

Pending Publication Date: 2022-01-28
NARI TECH CO LTD +1
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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 overcome the deficiencies in the prior art, to provide a transformer excitation inrush anti-maloperation method and device to solve the problem that the excitation inrush current generated after the traction transformer is closed with no load may cause traction transformer protection malfunctions, and The no-load closing of parallel traction transformers or the closing of the autotransformer in the power supply arm will cause through-flow and inrush current in the traction transformer and feeder, which may cause misoperation of traction transformer protection or feeder protection.

Method used

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  • Method and device for preventing maloperation of magnetizing inrush current of transformer
  • Method and device for preventing maloperation of magnetizing inrush current of transformer
  • Method and device for preventing maloperation of magnetizing inrush current of transformer

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Embodiment 1

[0053] Such as figure 1 As shown, an embodiment of the present invention provides a transformer excitation inrush prevention maloperation method, including the following steps:

[0054] Step 1. Obtain the closing command signal from the intelligent terminal IED through the traction substation domain protection device and monitor whether the closing command signal is activated;

[0055] (1) Acquisition of closing command signal:

[0056] Transformer circuit breaker intelligent terminals include traction transformer circuit breaker intelligent terminals, parallel traction transformer circuit breaker intelligent terminals in traction substations, and autotransformer circuit breaker intelligent terminals in autotransformer stations in power supply arms; transformer circuit breaker intelligent terminals acquire circuit breakers The closing command signal is configured into the intelligent terminal IED as a virtual remote signal.

[0057] (2) Monitor whether the closing command si...

Embodiment 2

[0095] An embodiment of the present invention provides a transformer excitation inrush anti-maloperation device, including a processor and a storage medium;

[0096] The storage medium is used to store instructions;

[0097] The processor is configured to operate in accordance with the instructions to perform the steps according to any one of the methods described above.

[0098] Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein....

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Abstract

The invention discloses a method and a device for preventing maloperation of excitation surge current of a transformer. The method comprises the following steps: acquiring a closing command signal from an intelligent terminal IED (Intelligent Electronic Device) and monitoring whether the closing command signal acts or not; when the closing command signal acts, acquiring a current sampling value and a voltage sampling value of the transformer; acquiring a first current sampling extreme value and a current phase based on the current sampling value; acquiring the voltage phase of the first current sampling extreme value based on the voltage sampling value, and predicting whether the working state of the transformer is a switching-on state or not by combining the current phase; and sending the prediction result to a protection device, wherein the protection device adjusts a constant value threshold and a delay constant value based on the prediction result to realize maloperation prevention of the excitation surge current. According to the method, the working state of the transformer can be predicted, and the traction transformer protection or feeder protection can realize faster excitation surge current maloperation prevention through the prediction result of the switching-on state of the transformer.

Description

technical field [0001] The invention relates to a method and a device for preventing malfunction of an excitation inrush current of a transformer, and belongs to the technical field of electric power system relay protection. Background technique [0002] After the traction transformer in the traction substation is closed without load, due to the influence of its closing angle, residual magnetism and other factors, a relatively large amplitude excitation inrush current may be generated. The voltage, current and circuit breaker position required by the protection device in the smart substation are collected through the merging unit and the smart terminal respectively. The identification of the transformer excitation inrush current by the protection device requires continuous observation of the current waveform for a period of time. During this period, the transformer The differential protection may be started, but the characteristics of the excitation inrush current waveform h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/04H02J13/00
CPCH02H7/04H02J13/0004Y02E60/00Y04S10/18Y04S10/20
Inventor 安林吴通华戴魏王小红滕贤亮沈桂鹏侯启林王应瑞龙锋刘小宝姚刚余洪洪丰王中浪
Owner NARI TECH CO LTD
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