High frequency current sensor for partial discharge detection of cable

Abstract

The invention discloses a high frequency current sensor for partial discharge detection of a cable. The high frequency current sensor includes a circular metal box having a circular cavity therein, two semi-circular magnetic cores, an insulating washer and a connector, wherein the metal box includes a first semi-circular box and a second semi-circular box which are spliced together, one end of thefirst semi-circular box is rotatably connected with one end of the second semi-circular box, and a lock catch is disposed between the other end of the first semi-circular box and the other end of thesecond semi-circular box; the two semi-circular magnetic cores are arranged in the first semi-circular box and the second semi-circular box respectively, to be disposed in the circular cavity; a metal coil is wound around one of the two semi-circular magnetic cores; the insulating washer is arranged between the metal box and the magnetic cores; the connector is connected with the metal coil; andthe first semi-circular box and the second semi-circular box are sleeved with two sliding blocks arranged in pairs respectively. At least two elastic elements are correspondingly arranged between eachsliding block and the semi-circular box corresponding to the sliding block respectively.

Description

technical field [0001] The invention relates to a sensor, in particular to a sensor for partial discharge detection. Background technique [0002] With the continuous increase of the power load of the urban power grid, the failure probability of power cables has also greatly increased. It is of great significance to carry out partial discharge detection and protection of power cables for the safe and stable operation of the power system. [0003] The current partial discharge detection methods of power cables mainly include broadband electromagnetic coupling method, ultra-high frequency method and ultrasonic detection method. When ultrasonic testing method and UHF method are used to detect partial discharge of power cables, the effective range of detection is small due to fast signal attenuation. In addition, the operating environment of power cables is complex and has strong interference. Cell phone signals, automobile engine ignition, and mechanical vibration and noise wi...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a high-frequency current sensor for partial discharge detection of cables. The structure of the high-frequency current sensor is optimized, which fundamentally solves the problem of the partial discharge of cables with different voltage levels and different sizes. The different inner diameters make it difficult to use universally and the sensor is inconvenient to fix. This makes the high-frequency current sensor widely applicable to cables of various specifications, and because of its simple structure, the high-frequency current sensor also has the advantage of being easy to operate and fix.

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