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System and method for applying impact current for measuring grounded screen electric resistance and inductor

A technology of inrush current and grounding grid, applied in the measurement of resistance/reactance/impedance, measurement of electrical variables, measurement of grounding resistance, etc., to achieve the effects of high measurement accuracy, simple measurement device, and easy operation

Active Publication Date: 2008-08-06
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST +1
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  • Application Information

AI Technical Summary

Problems solved by technology

The current grounding impedance tester generally can only measure the power frequency grounding impedance and DC resistance of the grounding device, so it is very necessary to develop a system for measuring grounding impedance with impulse current

Method used

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  • System and method for applying impact current for measuring grounded screen electric resistance and inductor
  • System and method for applying impact current for measuring grounded screen electric resistance and inductor
  • System and method for applying impact current for measuring grounded screen electric resistance and inductor

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Embodiment Construction

[0022] The hardware of the present invention is mainly an impulse current generator and a data acquisition device. The design idea of ​​the impulse current generator is: in the case of sufficient insulation of the box, it should be as small as possible and easy to carry. According to the requirements of the actual project, the impulse current generator is designed to have an adjustable output voltage, a maximum voltage of 5kV, and a steep impulse current waveform. The power supply of the impulse current generator adopts 220V AC power supply, and charges the capacitor I of 1~10KV, 10~200μF (the host capacitor is 10μF, and a larger external charging capacitor L can be connected in parallel) through the voltage doubler rectification circuit, and cut off after charging is completed. The power supply controls the conduction of the thyristor G, and the capacitor I discharges the discharge circuit. The surge current generator can obtain the required surge current waveform by adjusti...

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Abstract

The invention relates to a system and a method of measuring the resistance and inductance of an earthed network through dash current, which solve the problem of measuring the ground impedance, resistance and inductance of the earthed network when the lightning current passes through the earthed network. The input of a dash current generator (B) is connected with the output of an isolating transformer (A), the input of the isolating transformer (A) is connected with an AC power supply, the output of the dash current generator (B) charges a capacitor (I) through a silicon stack (C) and a protective resistance (D), a silicon controlled (G) controls the capacitor (I) to discharge to a test loop, a shunting resistance (F), an adjustable inductance (E) and an equivalent ground network (H) are connected in series in the discharge loop of the capacitor (I), and a first divider resistance and a second divider resistance (M1, M2) are connected in parallel with the equivalent ground network (H). The shunting resistance (F) and the second divider resistance (M2) are connected with the input of an A / D converter (J), and the output of the A / D converter is connected with a microprocessor (K).

Description

Technical field: [0001] The invention relates to a measurement system and method for power system simulation of grounding parameters when lightning current flows through the ground grid. Background technique: [0002] In the latest measurement guidelines in 2006, it is stipulated that the concept of grounding resistance should be replaced by grounding impedance. This makes the parameter concept of the grounding device more accurate, and also puts forward new requirements for the grounding measurement ground of the power system. We know that the so-called grounding resistance is not the pure resistance of the grounding device, but the grounding impedance including the reactance component, which is divided into power frequency grounding impedance and impact grounding impedance. When the power frequency current flows to the earth, the impedance presented by the grounding medium is the power frequency grounding impedance, and the impedance presented by the lightning current (im...

Claims

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Application Information

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IPC IPC(8): G01R27/20G01R27/08G01R27/26
Inventor 李建明
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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