A Method for Detection of Error Characteristics of UHV Capacitive Voltage Transformer

Abstract

The invention provides an error characteristic detection method of an extra high voltage capacitive voltage transformer. The method comprises the steps that offline transformer on-site handover detection is carried out on an electromagnetic voltage transformer, and the electromagnetic voltage transformer is corrected according to a detection result; the corrected electromagnetic voltage transformer is used as a standard voltage transformer, and an error online detection device is used to carry out online error detection on the capacitive voltage transformer; the capacitive voltage transformer is respectively connected with a three-phase bus transformer outgoing wire and a high resistance outgoing wire; and the electromagnetic voltage transformer is connected with a bus between the transformer and the high resistance. Compared with the prior art, the error characteristic detection method of the extra high voltage capacitive voltage transformer, which is provided by the invention, has the advantages that online error detection can be carried out on the extra high voltage capacitive voltage transformer, which fits the actual situation of the capacitive voltage transformer; and error measurement is more accurate than offline error detection.

Description

technical field [0001] The invention relates to a method for detecting error characteristics of a voltage transformer, in particular to a method for detecting error characteristics of an ultra-high voltage capacitive voltage transformer. Background technique [0002] In order to ensure the reliable operation of UHV voltage transformers, it is necessary to carry out on-site handover tests on the installed UHV voltage transformers. In the UHV AC test demonstration project and expansion project, the UHV voltage transformer field handover test is mainly to carry out the error test on the UHV voltage transformer after the UHV voltage ratio standard device is transported to the site and the wires are disconnected. [0003] Due to the optimized structure design of the substation, if the center distance between the UHV high-resistance outgoing line capacitive voltage transformer and the high-resistance bushing is only 4m, this distance can meet the equipment operation requirements, ...

AI Technical Summary

Problems solved by technology

[0003] Due to the optimized structure design of the substation, if the center distance between the UHV high-resistance outgoing line capacitive voltage transformer and the high-resistance bushing is only 4m, this distance can meet the equipment operation requirements, but in the case of disconnection, the distance is less than the rated voltage UHV The safe distance between the capacitive voltage transformer and the high reactance cannot realize the error handover test under full voltage, so it is impossible to ensure the normal operation of the UHV capacitive voltage transformer in the entire substation

Therefore, in the UHV AC test demonstration project and its extension project, it is impossible to use the existing method to conduct error tests on the high-resistance side capacitive voltage transformers of power transmission projects that need to be tested.

[0004] In addition, due to the structural characteristics of the capacitive voltage transformer, its error characteristics are greatly affected by the distributed capacitance and the comprehensive electric field distribution.

Images