Standard voltage proportional device and operation method for on-line error calibration of voltage transformer

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...

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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

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