Method for improving transient error of capacitor voltage transformer

A technology of voltage transformers and transient errors, applied in instruments, measuring electrical variables, measuring devices, etc., can solve problems such as limited improvement effects and reduced reliability of power grids, achieve good general effects, improve accuracy, and improve transient The effect of the effect of state error

Inactive Publication Date: 2021-07-23
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a method for improving the transient error of the capacitive voltage transformer, so as to solve the problem that the transient error of the capacitive voltage transformer in the prior art can be improved only by optimizing the design, and adding an electronic protection circuit or adding a fast response circuit will cause problems. Causes problems that reduce the reliability of the grid

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  • Method for improving transient error of capacitor voltage transformer
  • Method for improving transient error of capacitor voltage transformer
  • Method for improving transient error of capacitor voltage transformer

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Embodiment Construction

[0056] The embodiments will be described in detail hereinafter, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following examples do not represent all implementations consistent with this application. These are merely examples of systems and methods consistent with aspects of the present application as recited in the claims.

[0057] see figure 1 , which is a flowchart of a method for improving the transient error of a capacitive voltage transformer in this application.

[0058] A method for improving the transient error of a capacitive voltage transformer provided in the present application includes the following steps:

[0059] according to image 3 The physical structure of the capacitive voltage transformer is shown, and the equivalent circuit o...

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Abstract

The invention discloses a method for improving the transient error of a capacitor voltage transformer, and the method comprises the following steps: deducing an equivalent circuit of the capacitor voltage transformer according to the physical structure of the capacitor voltage transformer; building a transient error model of the capacitor voltage transformer; outputting a real transient error curve; connecting a virtual capacitor voltage transformer transient error compensation device in series to the secondary side of the equivalent circuit of the capacitor voltage transformer to form a virtual capacitor voltage transformer transient error model; obtaining optimal parameters of the transient error model of the virtual capacitor voltage transformer through a parameter identification method, so that a virtual transient error curve output by the transient error model of the virtual capacitor voltage transformer is most fitted and approximate to the real transient error curve; and subtracting the virtual transient error curve from the real transient error curve to improve the transient error of the capacitor voltage transformer.

Description

technical field [0001] The present application relates to the technical field of capacitive voltage transformers, in particular to a method for improving transient errors of capacitive voltage transformers. Background technique [0002] There are mainly three types of voltage transformers used for voltage measurement in AC grids: electronic voltage transformers (electronic voltage transformers, EVTs), electromagnetic voltage transformers and capacitor voltage transformers (capacitor voltage transformers, CVTs). CVT is the most widely used voltage transformer for voltage measurement in high voltage class. When the primary system is in a steady state, the output voltage signal of the secondary side of the CVT can accurately reflect the voltage signal of the primary side; but when the primary system fails and causes a sudden change in voltage, since the CVT contains a large number of inductance and capacitance energy storage elements, its energy storage is released The process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 孟贤郭成李文云和鹏李胜男覃日升段锐敏
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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