Electromagnetic voltage transformer alternating current withstanding voltage test method based on equivalent impedance control

Abstract

The invention discloses the technical field of voltage withstanding tests of transformer winding equipment, and discloses an electromagnetic voltage transformer alternating current withstanding voltage test method based on equivalent impedance control. The method comprises the following steps: 1, connecting a control system, a compensation power supply, a PT and an AC voltage withstanding test power supply according to requirements, setting a compensation coefficient alpha to be 0, and adding the test side voltage to a PT rated voltage value; 2, acquiring equivalent impedance of a test side port; 3, boosting a PT test port; and 4, recording the voltage and current values of the test side, and calculating the equivalent impedance of a port of the test side. According to the test method provided by the invention, the equivalent impedance at the test side port of the PT equipment under the condition of alternating current withstand voltage can be improved, so that the conditions that theoutput current of the test power supply is too large and the like caused by magnetic flux saturation are inhibited.

Description

technical field [0001] The invention relates to the technical field of withstand voltage test of transformer winding equipment, in particular to an electromagnetic voltage transformer AC withstand voltage test method based on equivalent impedance control. Background technique [0002] Electromagnetic voltage transformer (PT) is an important equipment in power system and smart grid, and plays an important role in the normal operation and fault warning of the power system. With the continuous improvement of the voltage level of the power system, the requirements for the withstand voltage level of the PT are also continuously improved. In order to ensure the normal operation of PT equipment, it is necessary to conduct withstand voltage tests on PT equipment regularly. [0003] Magnetic flux saturation is a problem that must be faced in the AC withstand voltage test of electromagnetic PT equipment: when the test voltage is applied to the PT port, the PT core will enter a state ...

AI Technical Summary

Problems solved by technology

[0003] Magnetic flux saturation is a problem that must be faced in the AC withstand voltage test of electromagnetic PT equipment: when the test voltage is applied to the PT port, the PT core will enter a state of magnetic saturation or even deep magnetic saturation, which will seriously affect the safety of test personnel and equipment. threatened

Ho

Images