Apparatus and method for judging the breakpoint position of grounding grid by electromagnetic induction
A technology of electromagnetic induction and grounding grid, which is applied in the direction of measuring device, fault location, measuring electricity, etc., can solve complex calculation and complex problems, achieve the effect of easy method, easy operation, and safe and stable operation
Active Publication Date: 2021-08-31
CHINA THREE GORGES UNIV
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Problems solved by technology
[0005] The technical problem of the present invention is that the existing methods for judging the breakpoint of the grounding grid either require sophisticated instruments or complex calculations, which are too complicated
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Embodiment Construction
[0025] In one embodiment, the ground network comprises three rows and three column conductors. like figure 1 Shown, an electromagnetic induction means determines the position of the breakpoint ground network, comprising the alternating voltage source 4, the voltage detection unit 5, 12 in series excitation coil 2 and detection coil 3 12, the ground conductor of each segment spaced a network excitation coil 2 and a detecting coil 3, exciting coil 2 and detection coil 3 are respectively provided at both ends of each segment of the conductor; excitation coil 2 in series with both ends of the AC voltage source; detecting coil 3 are connected to the voltage detection unit 5. When laying ground, while set the excitation coil 2 and detection coil 3.
[0026] The frequency of the alternating voltage source 4 is 100-1000kHz.
[0027] Excitation coil 2, the excitation coil 21 and the series excitation coil lead wire 22 are provided with corrosion sleeve.
[0028] Detecting coil and the dete...
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The device for judging the breakpoint position of the grounding grid by electromagnetic induction includes an AC voltage source, a voltage detection unit, a plurality of excitation coils connected in series and a plurality of detection coils, and an excitation coil and a detection coil are arranged at intervals on each conductor of the grounding grid. Both ends of the excitation coil connected in series are connected to an AC voltage source; the detection coils are respectively connected to a voltage detection unit. The invention also discloses a method for judging the breakpoint position of the grounding grid by electromagnetic induction, including numbering the excitation coil and the detection coil respectively, applying an AC voltage source to the excitation coils in series, and measuring the voltage of each section of conductor by using a voltage detection unit. The magnitude of the induced voltage in the coil is detected and the position of the breakpoint of the grounding grid is judged according to the magnitude of the induced voltage. The device and method of the present invention can accurately judge whether there is a breakpoint in each segment of the conductor of the grounding grid and further determine the position of the breakpoint without power failure or excavation of the grounding grid, so as to ensure the safe and stable operation of the power system.
Description
Technical field [0001] The present invention belongs to the field of substation grounding, particularly relates to apparatus and a method using electromagnetic induction ground network determines the location of the breakpoint. Background technique [0002] Grounding grid is to protect the safe and stable operation of the substation, it may be provided with reference to ground potential substation, connected by a ground lead and the ground substation equipment, as quick drain channel power system fault currents. When the grounding grid corrosion was broken in the ground, it will bring it down to ground performance can not guarantee the safe and stable operation of the substation. However, since the grounding grid buried in the ground, it is difficult to make accurate judgments of their conductor corrode or break. Existing methods or require sophisticated equipment or require complex calculations too complicated. [0003] Publication No. Chinese patent CN1110707C "Diagnosis of gro...
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IPC IPC(8): G01R31/08G01R31/54G01R31/58
CPCG01R31/086G01R31/58G01R31/50
Inventor 曹成邱立苏攀常鹏江进波熊奇陈龙
Owner CHINA THREE GORGES UNIV