Test method of electromagnetic compatibility of electronic instrument transformer

Abstract

A method for testing electromagnetic compatibility of an electronic mutual inductor. A test voltage amplitude output by a high-voltage transformer is the same as a rated operational voltage of a major loop of a tested electronic mutual inductor, and the capacity of a load capacitor is selected under a condition that a steady-state current value is 0.5 A with a disconnecting switch being switched for connection. A primary part, a secondary connection, and an electronic merging unit of the tested electronic mutual inductor are systematically assembled and connected according to actual working conditions, and during the test, the electronic mutual inductor is powered and operates in a normal working manner. In a process that the disconnecting switch is switched for disconnecting or connecting the capacitor, an arc breakdown and extinction transient process occurs multiple times in the major loop, and a pulse current, a transient overvoltage, and a pulse magnetic field are produced multiple times in the transient process. According to numerical values of voltage and current waveforms measured once, an output characteristic and a working state of the electronic mutual inductor are subject to comparison, so as to determine the electromagnetic interference resistance performance of the electronic mutual inductor, thereby improving the reliability of on-site operation of the electronic mutual inductor and reducing the failure rate of the device.

Description

Technical field [0001] The invention belongs to the field of electromagnetic compatibility test and measurement, and particularly relates to a test method for the electromagnetic compatibility of an electronic transformer by separating and combining capacitive current of an isolating switch. Background technique [0002] At present, the electromagnetic compatibility of electronic transformer products is tested in accordance with the national standard "GB / T 17626 Electromagnetic Compatibility". The product has completed various electromagnetic compatibility test items and qualified test results in the actual operation process of the power system. There have been many failures of electromagnetic protection performance. 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 t...

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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

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