Optical fiber temperature compensator of electronic current transformer

Abstract

The invention discloses an optical fiber temperature compensator of an electronic current transformer, the current transformer comprises a current measuring coil and an energy obtaining coil which are sleeved on a line to be measured; the current measuring coil is sequentially connected with an integral amplification module, an A/D (analogue/digital) conversion module and a first E/O (electric/optic) conversion module, the first E/O conversion module is connected with a first O/E conversion module through an optical fiber, and the first O/E conversion module is connected with a current operation module which is connected with a synchronous control module; the energy obtaining coil is connected with a suspension power supply, and the suspension power supply is connected with the integral amplification module, the A/D conversion module and the first E/O conversion module; a semiconductor laser is connected with a wavelength division multiplexer, the wavelength division multiplexer is connected with the optical fiber, and interfaces of two backward scattered light channels of the wavelength division multiplexer are respectively connected with a photoelectric converter and an amplification circuit and further connected with a high-speed data acquisition card; and the high-speed data acquisition card is connected with the current operation module. The optical fiber temperature compensator of the electronic current transformer can effectively measure the temperature and perform temperature compensation for the measured current values.

Description

technical field [0001] The invention relates to a current transformer, which is a measuring device for current parameters in a power system of 110KV or below. Transformer temperature compensation device. Background technique [0002] The current transformer is an extremely important device in the power system. It plays the role of measuring and transforming the primary system current and isolating the high voltage of the primary system. At present, most power systems use traditional electromagnetic current mutual inductance, and the technology is very mature. Among them, iron-core current transformers are mainly dry, oil-immersed and gas-insulated. However, with the continuous improvement of the voltage level in the power system and the continuous improvement of protection requirements, the intelligent upgrading of substations and the development of digital power systems, some problems of traditional electromagnetic current transformers are increasingly exposed. The main sh...

AI Technical Summary

Problems solved by technology

[0015] In order to overcome the shortcomings of existing electronic current transformers that cannot effectively measure and compensate temperature, the present invention provides an optical fiber temperature compensator for electronic current transformers that can effectively measure temperature and perform temperature compensation for measured values

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