Comprehensive test device for impact power frequency grounding impedance

Abstract

The invention relates to the technical field of lightning protection grounding, and provides a comprehensive test device for impact power frequency grounding impedance. The device comprises a centralprocessing unit, a power supply module, a first high voltage switch, a high voltage direct current boost module, a charging and discharging capacitor C0, a second high voltage switch, a third high voltage switch, a power frequency ground screen impedance measuring circuit, a residual voltage detection circuit, a low frequency depolarization circuit, a ground screen waveform acquisition circuit, animpact current acquisition circuit, and a data processing circuit. A terminal C, a terminal E, a terminal P1, and a terminal P2 are arranged on the test device. Control ends of the high voltage direct current boosting module, the low frequency depolarization circuit, the first high voltage switch, the second high voltage switch, and the third high voltage switch are connected with an output end of the central processing unit. The charging and discharging capacitor C0 is connected with normally closed contacts of the first high voltage switch and is connected with two ends of the output of thehigh voltage direct current boost module in series. According to the comprehensive test device for the impact power frequency grounding impedance, the grounding screen is impacted by simulating the lightning impulse pulse waveform, so as to realize the impact of the grounding device and detection of the power frequency grounding impedance.

Description

technical field [0001] The invention relates to the technical field of lightning protection and grounding, in particular to a comprehensive testing device for impact power frequency grounding impedance. Background technique [0002] With the development of science and technology, microelectronic devices continue to be popularized and used, and the hazards of lightning have increased significantly. The essence of lightning protection is to effectively introduce lightning shock pulses into the ground. The standard of measurement is the impact grounding impedance value of the grounding device, which can most truly and scientifically reflect the characteristics and grounding effect of the grounding device, and is of great significance to lightning protection. The impact grounding impedance refers to the impedance value presented by the grounding body and the grounding medium (soil, rock, and resistance reducing agent, etc.) when the impact current or lightning current flows fro...

AI Technical Summary

Problems solved by technology

The power frequency grounding impedance refers to the impedance of the grounding body under the power frequency current. When measuring the grounding device, due to various interferences such as unbalanced zero-sequence current and radio frequency, the test results have a large error.

In particular, the grounding impedance of large-scale grounding grids is generally small (generally below 0.5Ω), and the relative error caused by interference is larger

The existing impedance testing device can only measure one of the power frequency grounding impedances, and cannot accurately test the impact impedance of the grounding grid

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