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Standard voltage ratio device for online error correction for voltage transformer and operation method

A voltage transformer and standard voltage technology, applied in the field of standard voltage proportional devices, can solve the problems of time-consuming and laborious, inability to obtain real data of three-phase live voltage, huge workload of offline error characteristic detection, etc.

Active Publication Date: 2015-02-04
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large number of voltage transformers in the power system, the workload of offline error characteristic detection is huge, time-consuming and labor-intensive, and the real data of the three-phase live state cannot be obtained

Method used

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  • Standard voltage ratio device for online error correction for voltage transformer and operation method
  • Standard voltage ratio device for online error correction for voltage transformer and operation method
  • Standard voltage ratio device for online error correction for voltage transformer and operation method

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Embodiment Construction

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0034] The present invention provides a standard voltage proportional device for on-line error calibration of voltage transformers based on inverted current transformers. After the grounding wire of the end screen of the inverted current transformer is untied, it is connected to a low-voltage standard capacitor circuit, and the high voltage formed by the equipment itself Capacitor combination voltage divider; a standard voltage transformer is used to calibrate the standard voltage proportional device provided by the present invent...

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Abstract

The invention provides a standard voltage ratio device for online error correction for a voltage transformer and an operation method. The device comprises an inverted current transformer, a low-voltage standard capacitance circuit and a low-voltage standard capacitor and an earthing switch which are connected in parallel. The low-voltage standard capacitance circuit is connected with a secondary-side output end of the inverted current transformer. When the earthing switch is closed, the low-voltage standard capacitor does not work, and the inverted current transformer works. When the earthing switch is disconnected, the low-voltage standard capacitor serves as the low-voltage arm, and a high-pressure capacitor at the high-pressure end of the inverted current transformer serves as the high-pressure arm to form the standard voltage ratio device, and the inverted current transformer works normally. According to the standard voltage ratio device, compared with the prior art, error correction can be performed on the voltage transformer in the electrification state by the aid of the inverted current transformer.

Description

technical field [0001] The invention relates to a standard voltage proportional device, in particular to a standard voltage proportional device for on-line error calibration of a voltage transformer and an operation method. Background technique [0002] In recent years, the voltage level of the power system has been continuously improved, and the power generation and power consumption have increased sharply. At the same time, with the reform of the power system, especially the separation of power generation and transmission, the accuracy and fairness of electric energy measurement have attracted great attention from the society. The voltage transformer is an important part of the electric energy metering device at the gateway. In order to ensure its reliable operation, according to the "Electrical Equipment Installation Engineering Electrical Equipment Handover Test Standard", the voltage transformer needs to be handed over after the field installation. Testing is a very imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/02
Inventor 王欢王晓琪汪本进项琼汪泉杜砚岳长喜朱凯王雪
Owner STATE GRID CORP OF CHINA
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