Transient characteristic detection system and method of electronic voltage transformer

Abstract

The invention discloses a transient characteristic detection system and a transient characteristic detection method for electronic voltage transformers. The system comprises a transient test condition simulation unit, a high-frequency voltage divider, a merging unit and a transient characteristic detection unit. The transient test condition simulation unit outputs a primary high voltage U1, and the primary high voltage U1 is converted into a standard source signal U2 of the transient characteristic detection unit through the high-frequency voltage divider. A detected electronic voltage transformer is connected in parallel with the high-frequency voltage divider, and a sampling value of the detected electronic voltage transformer is sent to the transient characteristic detection unit through an optical fiber interface of the merging unit and used as a detected signal of the transient characteristic detection unit. The transient characteristic detection system and the transient characteristic detection method of the invention can be used for reliably and perfectly detecting the transient characteristic of the electronic voltage transformer to improve the transient performance of the electronic voltage transformer and provide technical support for safe and stable operation of the electronic voltage transformer.

Description

technical field [0001] The invention relates to the technical field of smart grid detection, in particular to a transient characteristic detection system and method of an electronic voltage transformer. Background technique [0002] With the rapid development of smart grids, electronic voltage transformers (EVTs) have been widely used in smart grids. Wave and other IED equipment, its performance directly affects the operation of IED equipment. [0003] When the power grid is running stably, the frequency of the primary voltage amplitude of the electronic voltage transformer is close to the rated parameter value, but when the power grid has overvoltage, or atmospheric discharge, or switch operation, or short-circuit fault, or line reclosing, etc. , the voltage of the power grid system will have a transient process. In this process, the electronic voltage transformer is required to accurately transmit and change the primary voltage within milliseconds without exceeding the er...

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Problems solved by technology

[0006] The technical problem solved by the present invention is to overcome the inability of the traditional test system in the prior art to access digital quantities, which causes a serious lag in the transient test of the electronic voltage transformer. At present, there is no transient characteristic for EVT at home and abroad. Carry out a special testing method and system. The transient characteristic detection system and method of the electronic voltage transformer provided by the present invention can reliably and perfectly detect the transient characteristics of the electronic voltage transformer, aiming at improving the electronic voltage mutual inductance. Transient performance of electronic voltage transformers, improve the testing technology of electronic voltage transformers, and provide technical guarantee for the safe and stable operation of electronic voltage transformers

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