Device for partial discharge detection of electrical device

Abstract

The present invention discloses a device for partial discharge detection of an electrical device. The device comprises a light source, a fiber magnetic field sensor, a fiber electric field sensor, a signal processing unit and a wireless communication unit. The fiber magnetic field sensor and the fiber electric field sensor are arranged to obtain the polarities of the electric field and the magnetic field around a conductor to be detected, and the propagation direction of the partial discharging signals is determined according to the obtained electric field and the magnetic field, so that the detection sensitivity is high, the directivity is good, the antijamming capability is high, the influence of temperature changing is little, and the optical path loss is small; the fiber magnetic field sensor can realize the reciprocity optical path measurement of the magnetic field measurement, and the precision is high; and the signal processing unit and the wireless communication unit are arranged to process the obtained partial discharge signals, and the obtained partial discharge signals are sent to an external terminal device through the wireless communication unit, so that the detection safety and the convenience are improved. The device for partial discharge detection of the electrical device is simple in structure, convenient in operation, high in precision and high in reliability.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of sensors, and in particular relates to a device for detecting partial discharge of electrical equipment. [0003] Background technique: [0004] High-voltage electrical equipment often shows the gradual development and enhancement of partial discharge before the breakdown of the transmitting insulation medium. Insulation faults often originate from the insulation degradation caused by partial discharge. Partial discharge is an important symptom of insulation deterioration. The higher the degree of insulation deterioration, the stronger the partial discharge activity. At the same time, partial discharge is also an important cause of further insulation deterioration. There are many methods for detecting partial discharge of high voltage electrical equipment such as transformers, mainly including very high frequency pulse current detection method, ultra high frequency electromagnetic wave detection met...

AI Technical Summary

Problems solved by technology

Among them, the first two methods detect electrical signals, which are easily interfered by electromagnetic interference signals. The piezoelectric sensor ultrasonically detects ultrasonic signals. Although it is not easily affected by electromagnetic noise, the sensor is attached to the device shell to detect partial discharge inside the device. Generated ultrasonic signal, so the sensitivity is not high

[0005] The existing optical methods for measuring partial discharge of high-voltage electrical equipment mainly include the following types: The first is the direct detection of visible light method, which is suitable for high-voltage electrical equipment using transparent dielectrics as insulating materials, but not suitable for solid dielectrics, Partial discharge detection of high-voltage electrical equipment with liquid dielectric as insulating material; the second is the photo-ultrasonic method, which has the advantages of strong anti-interference ability and good insulation, but it requires high sensor precision, difficult processing, and is affected by temperature Changes have a greater impact, and the ultrasonic signal has more refraction and reflection and is easy to attenuate; the third is based on the Faraday magneto-optical effect principle, and the optical fiber current sensor used in this method is only suitable for partial discharge detection of high-voltage electrical equipment with a fixed shape

Images