A dual-pulse health detection system and method based on an all-fiber-optic current transformer

Abstract

The invention discloses a double-pulse health detection system and method based on an all-fiber-optic current transformer. The system includes a double-pulse light source module, an optical path module, a modulation module, and a signal processing module; The pulse test light source returns to the signal processing module along the optical path module after passing through the optical path module and the modulation module; the detection method provided by the invention uses the light source to generate periodic wide and narrow double pulse signals on the basis of the structure of the optical fiber current transformer, and passes through the optical fiber The coupler is connected in series to the original optical path, and according to the different modulation depths of the phase modulators under different voltages and the principle of Rayleigh scattering, the modulation module and the optical path module of the optical fiber current transformer are detected respectively, so as to achieve rapid detection of the optical fiber current transformer Troubleshooting; while providing a double-pulse health detection system, the present invention can also have the function of current measurement.

Description

technical field [0001] The invention relates to the technical field of optical fiber current transformer detection, and mainly relates to a dual-pulse health detection system and method based on an all-fiber optic current transformer. Background technique [0002] In the past five years, in order to adapt to large-scale cross-regional power transmission and develop UHV and other high-capacity, high-efficiency, and long-distance advanced transmission technologies, my country has vigorously promoted the construction of UHV transmission networks. The improvement of the transmission voltage level has new requirements for the transmission and detection capabilities of the power grid. In the UHV power grid, the optical fiber current transformer is used as a primary device for measuring current. Safe and stable operation of the converter station. [0003] The optical fiber current transformer equipment used in the converter station is generally based on the Sagnac interference str...

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Problems solved by technology

[0003] The optical fiber current transformer equipment used in the converter station is generally based on the Sagnac interference structure. Although the measurement accuracy is very high, the connection requirements for each optical device are also high, and temperature changes, device aging, etc. will cause measurement errors

During the construction and operation and maintenance of the UHV power grid, the power inspection department found that the optical fiber current transformer will have a high error rate. When a fault occurs, it is often based on experience and lacks effective troubleshooting methods, which seriously affects the safety of the power grid. , which brings great challenges to the operation and maintenance of the power grid

[0004] On the other hand, most of the fiber optic current transformer equipment in domestic converter stations is purchased from foreign companies or agency companies, with patent protection and protection, and often cannot directly obtain data when a fault occurs.

There will always be various problems during the operation of fiber optic current transformers. At present, there is no health detection method for fiber optic current transformers in China. Therefore, a set of effective and convenient health detection methods for fiber optic current transformers is needed.

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