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Data selection method for calculation of average value of DC flow in rotor grounding protection

A rotor grounding and data selection technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as grounding resistance and grounding position calculation errors, and achieve the effect of reducing the impact

Active Publication Date: 2020-09-29
NARI TECH CO LTD
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Problems solved by technology

[0005] The invention provides a method for selecting data for calculating the average value of DC flow for rotor grounding protection, which solves the problem that the traditionally selected data may be time period data with relatively severe fluctuations, which brings relatively large errors to the calculation of grounding resistance and grounding position.

Method used

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  • Data selection method for calculation of average value of DC flow in rotor grounding protection

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0025] Such as figure 1 As shown in , the method of data selection for calculating the average value of DC flow of rotor grounding protection includes the following steps:

[0026] Step 1: M DC flows are involved in the calculation of the rotor grounding protection, and the DC flows between the two switchovers are sampled. Each DC flow has the same number of sampling points between the two switchovers, all of which are N, and the average value of the DC flow The window length is LT%, the value of T is 50, L<N, L is an integer multiple of 4, record x(m,n) as the sampling of the nth sampling point between the two switches of the mth DC flow Data, m=1,2,3,...,M, n=1,2,3,...,N.

[0027] Step 2, c...

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Abstract

The invention discloses a rotor grounding protection DC amount mean value calculating data selection method. The rotor grounding protection DC amount mean value calculating data selection method selects a data window by using the principle that the standardized data variance is the smallest for each DC amount involved in the calculation, selects a data window with less fluctuation and less interference, and removes (1-T%) / 2 of the data of the maximum and the minimum for the selected data windows, and selects the intermediate T% data to calculate the average value of the DC amount, so as to further reduce the influence of fluctuations and interference on the calculation of the average value of the DC amount.

Description

technical field [0001] The invention relates to a method for selecting data for calculating the average value of DC flow for rotor grounding protection, which belongs to the field of relay protection of electric power systems. Background technique [0002] The one-point grounding fault of the rotor circuit of synchronous motors such as generators and condensers is one of the common faults of synchronous motors, and the two-point grounding of the rotor circuit also occurs from time to time. In order to reduce the impact of the rotor circuit grounding on the synchronous motor and its system, the synchronous motor generally needs to be equipped with a reliable rotor grounding protection. At present, there are two mainstream rotor ground protection schemes at home and abroad: ping-pong rotor ground protection and injection rotor ground protection. [0003] Although the implementation methods of ping-pong rotor ground protection and injection rotor ground protection are differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D1/02G01R31/52
CPCG01D1/02G01R31/50
Inventor 郑作伟郑玉平季学军郝后堂揭萍谭凌周忠新李志坚潘书燕沈莹王焕凤毛俊喜曾炳文
Owner NARI TECH CO LTD
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