Test method of electromagnetic compatibility of electronic instrument transformer

Abstract

The invention discloses a test method of electromagnetic compatibility of an electronic instrument transformer. The output test voltage amplitude of a high-voltage transformer is same with the rated working main-loop voltage of a tested electronic instrument transformer, and the capacity of a load capacitor is selected according to a steady-state current value being 0.5 A after a disconnecting switch is connected. A primary part unit, a secondary connecting unit and an electronic merging unit of the tested electronic instrument transformer are systematically assembled and connected according to an actual use condition. In the test process, the electronic instrument transformer is powered on and operates in a normal working mode. In the process of the disconnecting switch connecting or disconnecting the capacitor, a main loop can generate many times of arc breakdown and extinguishing transient processes, and the transient processes can generate many times of pulse currents, transient over-voltages and pulsed magnet fields. The numerical value of primary voltage current waveforms is measured to compare with the output characteristic and working condition of the electronic instrument transformer, and the electromagnetic anti-jamming performance of the electronic instrument transformer is judged. The reliability of the field operation of the electronic instrument transformer is increased, and the equipment failure rate is reduced.

Description

technical field [0001] The invention belongs to the field of electromagnetic compatibility test and measurement, and in particular relates to a test method for the electromagnetic compatibility of an electronic transformer for a capacitive current test of an isolating switch. Background technique [0002] At present, the electromagnetic compatibility of electronic transformer products is carried out in accordance with the national standard "GB / T 17626 Electromagnetic Compatibility". Electromagnetic protection performance failures occurred many times in the process. After experimental research and theoretical analysis, the electromagnetic compatibility of electronic transformers cannot meet the requirements of the electromagnetic environment of the power system. The main reasons are: [0003] 1) The national standard stipulates that a single test item is carried out at the same time, that is, only a single disturbance source is applied to each test, such as electrical fast t...

AI Technical Summary

Problems solved by technology

[0006] 4) Most of the test items stipulated in the national standard are component-level tests, that is, the main components of the electronic transformer are tested, and there is a lack of system-level electromagnetic compatibility test items. The system-level electromagnetic compatibility test items are more closely related to the actual operating conditions. close to

Images