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A measurement state evaluation method and system of an electronic voltage transformer

A voltage transformer and measurement state technology, which is applied in the field of electronic voltage transformer measurement state evaluation, can solve the problems of low comparison standard accuracy and complicated methods, and achieve the effects of high accuracy and simple construction method.

Active Publication Date: 2019-02-19
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Application Information

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Problems solved by technology

[0004] The invention provides a method and system for evaluating the measurement state of an electronic voltage transformer, which solves the problems that the comparison standard accuracy of the existing method is not high and the method is complicated

Method used

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  • A measurement state evaluation method and system of an electronic voltage transformer
  • A measurement state evaluation method and system of an electronic voltage transformer
  • A measurement state evaluation method and system of an electronic voltage transformer

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Embodiment Construction

[0062] 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.

[0063] Such as figure 1 As shown, the electronic voltage transformer measurement state evaluation method includes the following steps:

[0064] Step 1, obtaining the sampling signals of each section of the grid voltage signal by the electronic voltage transformer at equal time intervals.

[0065] Step 2, calculate the initial phase sequence of each segment according to the sampling signal and the grid voltage mathematical model of the corresponding segment.

[0066] The process of calculating the initial phase sequence is as follows:

[0067]21) Carry out Fourier transform to each segment grid voltage mathematical model;

[0068] The grid voltage mathematical model f(t) is:

[0069]

[0...

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Abstract

The invention discloses a measurement state evaluation method of an electronic voltage transformer, which comprises the steps of acquiring sampling signals of equal time intervals of each section of the voltage signal of a power network by the electronic voltage transformer; according to the sampled signal and the corresponding network voltage mathematical model, the initial phase sequence of eachsegment is calculated. Differential operation is carried out on the initial phase sequence to obtain the differential sequence. The stationarity of the difference series is tested by the stationaritytest method. Based on the results of the stationarity test, the measurement status of the electronic voltage transformer is evaluated. At that same time, the invention also disclose an electronic voltage transformer measure state evaluation system, which comprises a sampling signal acquisition module, an initial phase sequence calculation module, a differential sequence calculation module, a stability determination module and a measurement state evaluation module. The invention has the advantages of high comparison standard accuracy and simple construction method, and provides a low-cost andhigh-precision realization method for evaluating the measurement state of an electronic voltage transformer under the condition of no standard device.

Description

technical field [0001] The invention relates to a measurement state evaluation method and system of an electronic voltage transformer, belonging to the field of state evaluation and fault diagnosis of power transmission and distribution equipment. Background technique [0002] The electronic transformer is an important primary device for building a smart grid. It is used to measure voltage / current to sense the operating state of the power grid. Once the measurement state deteriorates but cannot be detected in time, it will have adverse consequences and endanger the safe and stable operation of the power grid. [0003] In order to ensure that the electronic transformer is in a good measurement state, scientific researchers have carried out a lot of research work. The main method now is to establish a real-time monitoring system for the measurement state of the electronic transformer that does not rely on the standard device. The comparison standard is based on experience or al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06G06F17/14
CPCG06F17/141G06Q10/0639G06Q50/06
Inventor 程含渺夏国芳田正其宋瑞鹏季欣荣高雨翔王忠东蔡奇新李志新陈刚陆子刚
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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