Live-line working device for defect detection of composite insulator of power transmission line

Abstract

A live-line working device for defect detection of a composite insulator of a power transmission line comprises a photoelectric electric field sensor, an insulating rod, sliding tracks, an elevating mechanism, a polarized light source module and a ground collection and calculation module. The sliding tracks are separated from the external surface of a big umbrella skirt of the insulator for certain distance, the photoelectric electric field sensor is connected with the insulating rod, and the insulating rod is connected with the elevating mechanism. A laser source in the polarized light source module is connected with the photoelectric electric field sensor, and polarized light is modulated in the photoelectric electric field sensor, then transmitted a next stage of polarization maintaining fiber, and input to a photoelectric conversion module; and the photoelectric conversion module converts a polarized light signal modulated by the electric field into an electric signal, and the electric signal is connected to a collection card of an industrial control computer of the ground collection and calculation module. Thus, internal defects of the composite insulator during network operation of the power transmission line is detected, line maintenance staff is helped to discover the internal defect timely, and the operational stability of the power transmission line can be improved. The live-line working device is especially suitable for internal defect detection of vertical string or V-shaped composite insulators.

Description

technical field [0001] The invention relates to the field of power transmission lines, in particular to a live working device for defect detection of composite insulators of power transmission lines. Background technique [0002] Composite insulators for transmission lines are widely used in transmission lines due to their light weight, convenient installation, and good pollution resistance. However, it is easily affected by electric field, light, humidity and other factors during long-term operation, and internal defects in the form of mandrel and sheath interface and mandrel medium air gap may occur. Once the composite insulator has internal defects, moisture will overflow into the defective part of the air gap under the action of field strength during operation. After moisture penetrates into the defect, the breakdown field strength at the defect becomes lower, and discharge occurs when the breakdown field strength is reached. The active gas generated by the discharge, ...

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Problems solved by technology

[0003] Composite insulators in hanging grid operation are difficult to detect directly due to their high position and electrified characteristics. Most of the existing measurement methods are measured on the ground, which cannot accurately measure tiny internal defects of insulators.

Part of the electric field measurement method is not suitable for the detection of tension strings and V-shaped insulator strings

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