Device for measuring wide-frequency electric field

Abstract

The invention provides a device for measuring a wide-frequency electric field, wherein the device relates to the field of electric field measuring technology. The device can measure a low-frequency quasistatic electric field component and a high-frequency radiation electric field component of a wide-frequency lightning field. The device comprises a sensing electrode, a shielding housing, a secondary voltage shunting capacitor and a voltage sensor. The shielding housing is grounded. The shielding housing is connected with the sensing electrode through an insulating material. The secondary voltage shunting capacitor and the voltage sensor are arranged in the shielding housing. The sensing electrode is connected with the high-voltage end of the secondary voltage shunting capacitor. The secondary voltage shunting capacitor is parallelly connected with the voltage sensor.

Description

technical field [0001] The present application relates to the technical field of electric field measurement, in particular to a device for wideband electric field measurement. Background technique [0002] Lightning is one of the top ten natural disasters announced by the United Nations. Lightning discharge has a strong interference and damage effect on railway traffic, high-voltage transmission lines and other facilities. In order to better predict lightning, it is necessary to conduct corresponding research on the physical effects of lightning. Among them, measuring the electric field waveform generated by lightning discharge is one of the most basic means to study and understand the physical effects of lightning discharge. [0003] At present, fast and slow electric field changers are mainly used to measure the lightning discharge electric field. Among them, the working principle of the fast electric field change instrument is basically the same as that of the slow ele...

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Problems solved by technology

[0006] The bandwidth range of the lightning electric field can reach the order of MHz. However, due to the limitation of the bandwidth of the integrating circuit, a fast and slow lightning electric field variation instrument must be used to measure the broadband lightning field at the same time, so as to capture the quasi-static field components of the lightning electric field at the same time In addition, even if the above-mentioned fast and slow electric field change instruments are used at the same time, the bandwidth that can be measured by the fast and slow electric field change instruments while working at the same time is still less than 5MHz

[0007] Therefore, the above-mentioned traditional fast and slow lightning electric field variometers cannot fully meet the broadband measurement requirements of the lightning discharge electric field in the near area, resulting in the inability to provide effective lightning protection measures based on the measured data

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