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Capacitor voltage transformer error state evaluation method

A voltage transformer and state evaluation technology, applied to instruments, measuring electrical variables, measuring devices, etc., can solve problems such as online evaluation of capacitor voltage transformer error states, achieve strong applicability, and reduce power outage time.

Pending Publication Date: 2021-03-12
POWER SUPPLY SERVICE & MANAGEMENT CENT STATE GRID JIANGXI ELECTRIC POWER CO LTD +1
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for evaluating the error state of a capacitor voltage transformer, which aims to solve the problem of online evaluation of the error state of a capacitor voltage transformer without relying on standard voltage transformers

Method used

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  • Capacitor voltage transformer error state evaluation method
  • Capacitor voltage transformer error state evaluation method
  • Capacitor voltage transformer error state evaluation method

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The examples are illustrative, and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] A method for evaluating the error state of a capacitive voltage transformer, the process is as follows figure 1 shown, including the following steps:

[0030] Step 1: Collect the output amplitude of the capacitive voltage transformer, and use the output amplitude information to construct the original matrix;

[0031] Based on the sliding time window method, the implementation data of capacitive voltage transformers are collected and the original matrix is ​​constructed. In the intercepted error state evaluation time window, the amplitude data of the three-phase capacitive voltage transformer is collected T times, and the original matrix can be expressed as:

[0032]

[0033] Among them, u ...

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Abstract

The invention discloses a capacitor voltage transformer error state evaluation method, which aims to acquire output voltage of a three-phase capacitor voltage transformer in a healthy state without depending on a standard voltage transformer. A high-dimensional random matrix analysis method is used to establish a statistical characteristic parameter representing the error state of the capacitor voltage transformer and a threshold value of a statistical characteristic quantity of a normal operation state; the output voltage of the three-phase capacitor voltage transformer after operation is acquired, the statistical characteristic quantity representing the error state of the three-phase capacitor voltage transformer is calculated, and the statistical characteristic quantity is compared witha statistical threshold value to judge whether the error state of the capacitor voltage transformer is normal or not. According to the method, the error state of the capacitor voltage transformer isevaluated on the premise of not cutting off power and not depending on a standard device and a physical model.

Description

technical field [0001] The invention relates to the field of status evaluation and fault diagnosis of power transmission and distribution equipment, and more specifically, to a method for evaluating the error status of a capacitive voltage transformer. Background technique [0002] Capacitive voltage transformer provides accurate and reliable current and voltage signals for power system protection, control and measurement, and its error and reliability are closely related to the safe and reliable operation of the power system. However, compared with the electromagnetic voltage transformer, the capacitive voltage transformer has a significant problem of low error stability. [0003] For the state evaluation of the measurement error of capacitive voltage transformer, the method generally adopted is to compare and detect the error between the standard voltage transformer and the verified capacitive voltage transformer in a power failure state within a certain verification perio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 胡琛李敏杨爱超王毅吴宇王浩王浔李东江裴茂林
Owner POWER SUPPLY SERVICE & MANAGEMENT CENT STATE GRID JIANGXI ELECTRIC POWER CO LTD
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