Basin-type insulator crack detector based on fiber gratings

Abstract

The invention discloses a basin-type insulator crack detector based on fiber gratings. The basin-type insulator crack detector is characterized by comprising a broadband laser, six fiber gratings connected in series to one optical fiber, a fiber grating demodulation module and an A / D (analog to digital) sampling and processor module, wherein the six fiber gratings connected in series to one optical fiber are circularly bonded to the periphery of a basin-type insulator, one end of the optical fiber is accessed to the broadband laser, the other end of the optical fiber is connected with the fiber grating demodulation module, an output signal of the fiber grating demodulation module is accessed to the A / D sampling and processor module, and the A / D sampling and processor module acquires sampled data by an A / D sampler and uses a processor to perform signal judgment on the sampled data; the cracks are detected by changing the central wavelengths of the six fiber gratings.

Description

technical field [0001] The invention relates to the technical field of crack detection of basin-type insulators, and more specifically relates to an online detection device for cracks of basin-type insulators. Background technique [0002] It is very difficult to detect cracks in pot insulators, especially for small cracks. At present, there are mainly ultrasonic and ultra-high frequency detection methods. [0003] Ultrasonic testing is to detect the existence of cracks through ultrasonic echo signals. This detection method has certain limitations. The diameter of the pot insulator is relatively large, and the ultrasonic wave decays quickly inside the insulator. It is difficult for the ultrasonic wave to penetrate the entire insulator. [0004] UHF indirectly detects the cracks of pot insulators through the detection of partial discharges. When there are cracks in the pot insulators, high voltage electricity will generate electric sparks at the cracks, that is, partial disch...

AI Technical Summary

Problems solved by technology

When the external sensor is placed outside the pot insulator equipment for testing, if there is no good shielding effect, the received signal will be affected by external electromagnetic interference, and it is not easy to carry out long-term fixed monitoring

Many discharges inside the pot insulator do not exist for a long time, and the discharge will cause the circuit breaker to discharge to the ground at the same time, and it is very difficult to capture the partial discharge signal

A large number of previous studies have shown that the current detection is still unable to determine the apparent discharge of the internal fault of the equipment, but for the partial discharge of the detection equipment, the size of the apparent discharge is almost an indispensable standard, and it is also necessary to determine the seriousness of the insulation of the equipment. standard of degree

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