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
CN113156360AInactive Publication Date: 2021-07-23YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
Publication Date
2021-07-23
Estimated Expiration
Not applicable ยท inactive patent

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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.
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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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