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A method for identifying inrush current based on power fault component criterion

A technology for exciting inrush current and power failure, which is applied in the direction of measuring current/voltage, measuring devices, and measuring electrical variables, etc., can solve the problems of not using exciting inrush current, and achieve the effects of improving identification effect, fast tripping, high sensitivity and reliability

Active Publication Date: 2018-12-25
SHANDONG LUNENG SOFTWARE TECH
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Problems solved by technology

However, these methods are all based on current signals and waveforms, and do not take advantage of the fact that the inrush current is mainly composed of reactive power.

Method used

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  • A method for identifying inrush current based on power fault component criterion
  • A method for identifying inrush current based on power fault component criterion
  • A method for identifying inrush current based on power fault component criterion

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with embodiment.

[0021] A method for identifying inrush current of a power fault component criterion, characterized in that it comprises the following steps:

[0022] 1) Obtain all the voltage and current synchronous sampling data related to each circuit breaker on the boundary of the differential protection range;

[0023] 2) Convert all voltage and current sampling point data into per unit value data according to the power system per unit value conversion method:

[0024] u' 1(k) = u 1(k) / U 1e

[0025] u' 2(k) = u 2(k) / U 2e

[0026] i' 1(k) = i 1(k) / I 1e

[0027] i' 2(k) = i 1(k) / I 2e

[0028] u' 1(k) , u' 2(k) —Punit value data of voltage sampling point;

[0029] i' 1(k) , i' 2(k) —Punit value data of current sampling point;

[0030] u 1(k) , u 2(k) — Raw data of voltage sampling points;

[0031] i 1(k) i 2(k) - Raw data of current sampling point;

[0032] u 1e , u...

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Abstract

The invention discloses an excitation inrush current identification method based on a power fault component criterion. The method comprises the following steps: obtaining all voltage current synchronous sampling data correlated with each breaker on the boundary of a differential protection scope; converting all the voltage current sampling point data into per unit value data according to a power system per unit value conversion method, and according to the per unit value data, calculating power fault component sampling point data correlated with each breaker; solving integral values of obtained fault component sampling points of active power and reactive power; and setting a fault component threshold of differential protection active power, based on this, setting differential protection motion area determining, and if a motion area determining standard is satisfied, consuming that a fault does not occur in primary equipment yet excitation inrush currents exist and emitting excitation inrush current blocking signals to differential protection logic. According to the invention, when a transformer is closed due to a quite severe internal fault, the excitation inrush current criterion fails automatically and differential protection is not blocked, such that rapid tripping is realized.

Description

technical field [0001] The invention relates to an excitation inrush current identification method based on a power fault component criterion. Background technique [0002] The current identification methods of excitation inrush current mainly include: 1) the principle of second harmonic; 2) the principle of discontinuous angle; 3) the principle of waveform symmetry; 4) the principle of virtual third harmonic; 5) the principle of wavelet transform. These methods have a certain effect on the identification of excitation inrush current. However, these methods are based on current signals and waveforms for discrimination, and do not take advantage of the fact that the inrush current is mainly composed of reactive power. Contents of the invention [0003] In order to solve the above problems, the present invention proposes a method for identifying inrush current based on the power fault component criterion. This method utilizes the factor that the inrush current is mainly com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/045G01R19/00
CPCG01R19/00H02H7/045
Inventor 李伟硕巩方波傅孟潮焦之明王秉钧纪洪伟高彦斌
Owner SHANDONG LUNENG SOFTWARE TECH
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