Broadband magnetic field sensor device and method for measuring impulse current

Abstract

The invention discloses a broadband magnetic field sensor device and method for measuring impact current, which belong to the technical field of electrical measurement. The device comprises a magneticfield sensing probe which receives the magnetic induction intensity of a measured target magnetic field and generates a magnetic field differential signal according to the change relation of the magnetic induction intensity along with time, an active integration module which receives the magnetic field differential signal and converts the magnetic field differential signal into a measured impactcurrent signal, a data acquisition module which acquires a measured impact current signal, converts the measured impact current signal into a digital signal, and transmits the digital signal to a photoelectric conversion module, a photoelectric conversion module which receives the digital signal, converts the digital signal into an optical signal, and transmits the optical signal to a main controller, and the main controller which determines the impact current of the broadband magnetic field sensor according to the time parameter and the amplitude parameter of the impact current. The device provided by the invention is small in size, light in weight and wide in measurement frequency band, and can be applied to measurement of various transient magnetic fields.

Description

technical field [0001] The invention relates to the technical field of electrical measurement, and more specifically, to a wide-band magnetic field sensor device and method for measuring impulse current. Background technique [0002] When lightning strikes power transmission lines, buildings and other objects, extremely high voltage is generated, which causes insulation flashover or breakdown, and at the same time, it is accompanied by a strong inrush current, which will generate a very high ground potential rise, seriously endangering equipment and personal safety. [0003] In order to study the impact of lightning current on the equipment, and then provide technical support for the design of equipment withstand current capability, the impact current test equipment simulates the lightning current in the laboratory, and the electrical products of lightning protection equipment such as arresters, valve plates and high-power resistors need to be tested. Impulse current withsta...

AI Technical Summary

Problems solved by technology

[0005] The current magnetic field measurement sensor is generally used to measure the power frequency magnetic field (current). For the measurement of the impact current, it needs a wide frequency band and good response characteristics. The wide frequency magnetic field sensor is a small conductor ring. Due to the change of the measured magnetic field, the inside of the coil The magnetic flux of the coil will change, thereby generating an induced electromotive force, that is, the induced voltage is proportional to the rate of change of the magnetic flux passing through the coil. However, at this stage, there is no broadband magnetic field that is small in size, easy to use, large in sensitivity coefficient, and strong in anti-interference ability. sensor

Images