AC active electronic current transformer and power supply method

Abstract

The embodiment of the invention provides an active electronic current transformer and a power supply method. The active electronic current transformer comprises a high-voltage side coil power-taking power supply and a low-voltage side laser power supply, a high-voltage side signal collector and a laser power supply control unit, wherein the high-voltage side coil power-taking power supply and thelow-voltage side laser power supply are used for supplying power to the high-voltage side signal collector; the high-voltage side signal collector is used for detecting current flowing through the current transformer and power supply voltage of the low-voltage side laser power supply and feeding back the detection result to the laser power supply control unit; and the laser power supply control unit is used for controlling the low-voltage side laser power supply to be in a continuous power supply state or a standby heartbeat state according to the fed back current flowing through the current transformer and adjusting the output power of a laser according to the power supply voltage, which is fed back by the high-voltage side collector, of the low-voltage side laser power supply. In the scheme of the embodiment of the invention, the laser power supply control unit is set to control the output power and working state of the low-voltage side laser power supply, thereby achieving dual power supplies, and improving the reliability of the power supply of the current transformer. In addition, the active electronic current transformer has the advantages of simple and clear principle and ability of prolonging the service life of the laser.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to an AC active electronic current transformer and a power supply method. Background technique [0002] Current transformers are important equipment required for metering and relay protection in power systems. According to whether the high-voltage side part needs power supply, the electronic current transformer (ECT) can be divided into active electronic current transformer and passive electronic current transformer. [0003] Since the signal collector of the active electronic transformer is installed on the high-voltage side and is composed of electronic circuits, there must be a corresponding power supply for the high-voltage side signal collector. For this reason, the high-voltage side power supply technology has become a key technology in the practical process of active electronic transformers. For this key technology, most of the AC systems adopt the high-...

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Problems solved by technology

[0005] The embodiment of the present application provides an AC active electronic current transformer and a power supply method to solve the problem of low reliability of the high-voltage side power supply existing in the prior art

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