Three-phase asymmetric system harmonic detection device

Abstract

The invention belongs to the technical field of power equipment and especially relates to a three-phase asymmetric system harmonic detection device. The device comprises a detector used for detection,a socket is arranged at a top of the detector, the socket is fixedly connected with the detector, a socket protection plate is arranged at a position, corresponding to the socket, of the top of the detector, the socket protection plate is fixedly connected with the detector, and a current clamp used for detection is connected to the detector; a cable limiting ring is arranged on an inner side ofthe current clamp; a pressing rod is used for pinching up a movable clamp arm; then a cable is placed on the inner side of a limiting arc plate; afterwards, the pressing rod is put down, the movable clamp arm is clamped under the action of a spring; and the limiting arc plate is used for clamping and fixing the cable, the cable can be fixed, the cable is prevented from sliding or moving left and right, a socket protection plate is arranged on the detector, a protection film is arranged on the inner side of the socket protection plate, a socket can be protected, and external dust or particles are prevented from entering the socket to affect signal transmission.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a harmonic detection device for a three-phase asymmetrical system. Background technique [0002] Three-phase circuit current detection has two main purposes, one is the control of harmonic pollution and compensation of reactive power, and the other is fault diagnosis and protection. The former needs to accurately detect the total harmonic current of the three-phase circuit or the three-phase base The active and reactive current components of the wave current, the latter needs to detect the characteristic sub-harmonic current corresponding to the fault, the harmonic refers to the electric quantity whose frequency is an integer multiple of the fundamental wave, generally refers to the The non-sinusoidal power of the non-sinusoidal power is decomposed by Fourier series, and the rest of the power generated by the current greater than the fundamental frequ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the harmonic detection for three-phase circuits is detected by a harmonic detector, and the cable is passed through the current clamp of the harmonic detector. However, the existing current clamp cannot limit the position of the cable, and the cable is easy to move. And the detector will be applicable in the outdoor environment. There is no protective measure at the socket of the existing detector, and it is easy to enter sand and dust, which will affect the information transmission at the socket connection.

Images