Metering low-voltage current transformer operation quality test system based on real power environment and evaluation method

Abstract

The invention provides a real power environment-based metering current transformer operation quality test system and evaluation method. The method comprises the steps: firstly a metering current transformer is connected to a power grid, and a large number of onsite working condition waveforms is acquired through a high-speed wave recording technology; and then, a controller, a signal generator, aprogram-controlled voltage source and a program-controlled electronic load are utilized to establish a real power test platform for the operation error of the current transformer, so that the previously recorded waveform under the actual working condition is reproduced; then the reproduced waveform serves as the primary side input of the experimental current transformer and the current transformerbeing higher than two levels in accuracy, and the secondary side output of the experimental current transformer and the high-accuracy-level current transformer is recorded, and the operation error ofthe current transformers is measured; the used test waveform is decomposed and shaped to obtain a current transformer operation error test waveform library. The method has the advantages of being close to on-site actual working conditions, wide in practicability and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of signal acquisition and application of electrical measuring components, in particular to a measurement system and evaluation method for the running quality of a low-voltage current transformer for measurement based on a real power environment. Background technique [0002] In recent years, the structural changes of the power grid have been significant. With the continuous construction and derivation of new power grid links such as smart grids, distributed power sources, new energy sources, and micro-grids, the load structure of the power system has shown that traditional loads are dominant, and other high-tech A situation where the share of the load is increasing. With the continuous increase of semiconductor load applications, such as various switching power supplies, variable frequency power supplies, speed controllers, LED lighting, high-power inverters, etc., the load characteristics of the power grid ...

AI Technical Summary

Problems solved by technology

Due to technical limitations, it is difficult to completely reproduce the complex working conditions on site. Usually, a steady-state three-phase sinusoidal signal or a harmonic-added steady-state signal is used for simulation testing.

In this way, when testing the operating error of the current transformer in the laboratory, it is impossible to simulate the actual actual working conditions on site

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