Substation grounding grid grounding resistance acquisition method

A substation grounding network, grounding impedance technology, applied in the direction of grounding resistance measurement

Active Publication Date: 2015-09-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
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Problems solved by technology

Therefore, only measuring the power frequency grounding impedance cannot represent the safe operation of the substation grounding network under fault conditions.

Method used

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  • Substation grounding grid grounding resistance acquisition method
  • Substation grounding grid grounding resistance acquisition method
  • Substation grounding grid grounding resistance acquisition method

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Embodiment

[0027] The invention can simultaneously obtain the power frequency grounding impedance, impact grounding impedance, grounding resistance and reactance of the grounding network, that is, use the on-site impulse current generator to output the standard impulse current waveform, apply it to the grounding network of the substation to be evaluated, and measure the selected input The impact current and transient response voltage waveform signals of the grounding down conductor, using the measurement and control system software based on the impact grounding impedance algorithm, the 50Hz power frequency grounding impedance algorithm and the resistance-reactance separation algorithm, respectively get the power frequency grounding of the grounding network Impedance, Impulse Ground Impedance, Ground Resistance and Reactance.

[0028] Concrete result of the present invention can refer to accompanying drawing, figure 1 It is a block diagram of main modules of a method for simultaneously ob...

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Abstract

The invention relates to a substation grounding grid grounding resistance acquisition method. The method includes the following steps that: 1) a field impact current generation module generates impact current which acts on an input grounding downlead of a substation grounding grid; 2) a grounding downlead transient current and voltage recording module collects the impact current generated by the field impact current generation module and transient response voltage waveform signals of the input grounding downlead; and 3) a measurement and control calculation module processes the current and voltage waveform data provided by the grounding downlead transient current and voltage recording module, so that the impact grounding resistance, power frequency grounding impedance, grounding resistance and reactance value of the grounding grid can be obtained, and the results are stored in a test result storage and recording module. Compared with the prior art, the substation grounding grid grounding resistance acquisition method of the invention is simple and accurate and is not limited by field operating conditions.

Description

technical field [0001] The invention relates to a substation grounding grid monitoring technology, in particular to a substation grounding grid grounding impedance acquisition method. Background technique [0002] Substation grounding grid is an important facility to ensure electrical equipment and personal safety. At present, the grounding impedance value obtained by the commonly used power frequency grounding resistance test is 50Hz or close to the power frequency grounding impedance value at 50Hz, but in fact, a short-circuit grounding fault occurs in the substation, or under the action of lightning intrusion wave or operation wave, the grounding grid temporarily The state impact grounding impedance plays a decisive role. Therefore, only measuring the power frequency grounding impedance cannot represent that the substation grounding grid can operate safely under fault conditions. Contents of the invention [0003] The object of the present invention is to provide a me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/20
Inventor 司文荣傅晨钊苏磊陆冰冰祝达康
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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