Impact grounding impedance measuring system and measuring method thereof

Abstract

The invention provides an impact grounding impedance measuring system which comprises a high-voltage direct current source, a high-voltage pulse capacitor, a discharging loop, a high-voltage charging switch, a high-voltage discharging switch, a resistance current divider, a water resistance voltage divider, a high-voltage pulse source control table, a digital oscilloscope and an optical fiber signal transmitting system, wherein the resistance current divider is connected with the high-voltage pulse capacitor and the discharging loop in series; the water resistance voltage divider is connected with a reference grounding electrode of the discharging loop; the optical fiber signal transmitting system comprises an optical transmitter, an optical fiber and an optical receiver; the voltage divider and the current divider are respectively connected with the digital oscilloscope through the optical fiber signal transmitting system; and the high-voltage discharging switch is a motion ball gap switch. The invention has the advantages of compact structure, small volume, convenient carrying, simple operation, accurate and stable measuring value, reduction of electromagnetic interference and reduction of measuring error.

Description

technical field [0001] The invention relates to a grounding impedance measuring system and its measuring method, in particular to an impact grounding impedance measuring system and its measuring method. Background technique [0002] Impulse grounding resistance (Transient grounding resistance, TGR) reflects the impact characteristics of the grounding device under the action of lightning current. At the beginning of the last century, people widely used equipment such as voltage and ammeter to conduct voltammetry grounding resistance experiments, and the experimental errors were extremely large. Beginning in the 1950s, the E-type shaker of the former Soviet Union replaced the voltammetry, and the power source was a hand generator. The production of grounding resistance meters in my country began in the 1970s. ZC series (such as ZC-28, ZC-29, etc.) are better than E-type shakers in terms of structure, measurement range, accuracy and division value. However, due to the reason ...

AI Technical Summary

Problems solved by technology

[0004] In short, the existing impact grounding impedance measurement system can not reflect the impact characteristics and impedance characteristics of the grounding body under the action of lightning, and its shortcomings are mainly as follows: the test waveform is seriously disturbed and the measurement error is large

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