All-optical-fiber current transformer system with temperature measurement function

Abstract

The invention provides an all-optical-fiber current transformer system with a temperature measurement function. The all-optical-fiber current transformer system comprises a current sensing optical path and a temperature sensing optical path, the current sensing optical path comprises a laser device, an optical fiber coupler, an optical fiber circulator, an optical fiber polarizer, a phase modulator, an optical fiber delay ring, a current transformer sensing ring and a first photoelectric detector in sequence connection, and the first photoelectric detector is connected with an end D3 of the optical fiber circulator. The temperature sensing optical path comprises a laser device, an optical fiber coupler, an optical fiber temperature sensor and an optical comb shaped filter in sequence connection, and the optical comb shaped filter is connected with an end C of the optical fiber coupler. The all-optical-fiber current transformer system has the advantages that the temperature sensing optical path is added, current and temperature measurement functions are integrated, temperature compensation can be performed for the current transformer sensing ring, a corrected current value serves as a judgment basis of relay protection, the optical fiber temperature sensor and the current transformer sensing ring can jointly participate in relay protection, and accordingly accuracy of relay protection judgment is improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an all-optical current transformer system with a temperature measuring function. Background technique [0002] With the advancement of the smart grid strategy, all-fiber current transformers have gradually developed. At present, the all-fiber current transformer is a big hot spot, but the optical path of the current all-fiber current transformer is sensitive to temperature, and it is easily affected by the external temperature, which leads to deviations in the measured current. It is said that there may be misoperation of relay protection. Adding a temperature sensor to the sensing ring of the all-fiber current transformer and detecting its temperature is a way to solve the problem. First, the sensing ring with better temperature cycle repeatability can perform temperature compensation in real time to improve the overall temperature. The measurement accuracy of th...

AI Technical Summary

Problems solved by technology

However, electrical signal temperature sensors and wireless temperature sensors are susceptible to electromagnetic interference and are not suitable for high-voltage electrical occasions.

The existing fiber grating temperature sensing system is expensive and complicated, which is not conducive to integration with all-fiber current transformers

Images