All-fiber current transformer sensing device capable of actively compensating temperature

By introducing gas phase tubes and temperature sensors into the all-fiber current transformer, active temperature control of the sensing fiber is solved, and the problem of complex temperature compensation methods and limited compensation capabilities in the prior art is solved, and the measurement accuracy and use range of the equipment are improved.

CN119716233APending Publication Date: 2025-03-28MARKETING SERVICE CENT OF STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD
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Patent Information

Application Number
CN202311436924.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-10-31
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing temperature compensation method of all-fiber current transformers has complex problems with limited compensation capabilities, especially in low temperature, high temperature or uneven temperature distribution, which limits its use range.

Method used

A fully fiber current transformer sensing device that can be actively compensated is designed. By installing a gas phase tube on the optical fiber in the sensor and using a temperature sensor to detect the change in the difference between the ambient temperature and the constant temperature, nitrogen is transported to keep the fiber temperature constant.

Benefits of technology

It realizes effective control of the temperature of the all-fiber current transformer sensing fiber, improves measurement accuracy and anti-temperature interference capabilities, and expands the use range of equipment.

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Abstract

The invention provides an all-fiber current transformer sensing device capable of active temperature compensation, and belongs to the technical field of current sensor measurement. Comprising an SLD light source, an optical fiber coupler, an optical fiber polarizer, a phase modulator, a polarization maintaining optical fiber delay line, a 1 / 4 wave plate, a sensing module, a switch module, a power supply module, a gas phase module, a signal processing unit and a photoelectric detector. The SLD light source is connected with the optical fiber coupler, the optical fiber coupler is respectively connected with the photoelectric detector and the optical fiber polarizer, the optical fiber polarizer is connected with the phase modulator, the phase modulator is respectively connected with the signal processing unit and the polarization maintaining optical fiber delay line, the polarization maintaining optical fiber delay line is connected with the 1 / 4 wave plate, the 1 / 4 wave plate is connected with the sensing module, and the sensing module is respectively connected with the switch module, the phase module and the signal processing unit. The switch module is respectively connected with the power supply module and the signal processing unit; the power supply module is connected with the gas phase module; the signal processing unit is connected with the detector. The problems that a passive temperature compensation method is complex and limited in compensation capacity are solved.
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