A method for testing ground resistance and ground capacitance of ground grid
A technology of resistance to ground and capacitance to ground, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve problems such as no research data, and achieve great economic and social benefits, power grids and Strong effect of electrical equipment
Active Publication Date: 2015-10-28
STATE GRID CORP OF CHINA +1
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Problems solved by technology
There is no research data on whether there is capacitance to ground in the grounding body, and how the capacitance to ground affects electrical equipment or power systems
When studying the neutral point and grounding network of the direct grounding system of the power grid, it is found that the current grounding standard is to directly connect the neutral point of the three-phase line to the grounding network of the whole plant or station, and in theoretical analysis, the line A neutral point at both ends is equivalent to a point of zero resistance, which is physically incomprehensible and confusing because resistivity exists in any soil
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[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0024] At present, the characteristic parameters of the grounding grid generally only focus on the grounding resistance, step voltage, etc., and the specific measurements are specified in the standard GB / T17949.1-2000. The ground capacitance issue is not involved. There is no research data on whether there is grounding capacitance in the grounding body, and the impact of grounding capacitance on electrical equipment or power system. When studying the neutral point and grounding network of the direct grounding system of the power grid, it is found that the current grounding standard is to directly connect the neutral point of the three-phase line to the grounding network of the whole plant or station, and in theoretical analysis, the line A neutral point at both ends is equivalent to a point of zero resistance, which is physically incomprehensible and c...
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The invention discloses a testing method for the ground resistance and ground capacitance of a grounding network. The method comprises the following steps: setting a manual grounding electrode as a reference grounding point; designing a power supply and quick removal circuit; respectively connecting a positive terminal and a negative terminal of output ends of the power supply and quick removal circuit with a power network and the manual grounding electrode, and with two ends of a wave recorder, wherein the negative terminal of the wave recorder is connected with the manual grounding electrode; realizing charging and discharging of the standard capacitor and the grounding network through the power supply and quick removal circuit, and recording discharge time t1, based on which the grounding resistance R of the grounding network is calculated, in combination with an electric capacity Cstd of the standard capacitor; removing the standard capacitor, charging and discharging the grounding network, and recording the discharge time t2, based on which the grounding capacitance C of the grounding network is calculated, in combination with the grounding resistance R. The invention provides the testing method for the ground resistance and ground capacitance of the grounding network.
Description
technical field [0001] The invention relates to a method for testing ground resistance and ground capacitance of a ground grid. Background technique [0002] At present, the characteristic parameters of the grounding grid generally only focus on the grounding resistance, step voltage, etc., and the specific measurements are specified in the standard GB / T17949.1-2000. The ground capacitance issue is not involved. Resistance to ground is also a concept different from ground resistance. There is no research data on whether there is capacitance to ground in the grounding body, and how the capacitance to ground affects electrical equipment or power systems. When studying the neutral point and grounding network of the direct grounding system of the power grid, it is found that the current grounding standard is to directly connect the neutral point of the three-phase line to the grounding network of the whole plant or station, and in theoretical analysis, the line A neutral poin...
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IPC IPC(8): G01R27/02G01R27/26
Inventor 丁卫东苏文博张青青王颢
Owner STATE GRID CORP OF CHINA