Measuring device for diagnosing connecting state of grounding network
A technology of measuring device and connection state, applied in the direction of measuring device, grounding resistance measurement, measuring electricity, etc., can solve problems such as blindness and inaccuracy, and achieve the goal of improving applicability, reducing cost, and avoiding blindness and inaccuracy. Effect
Inactive Publication Date: 2012-11-07
四川宇峰科技发展有限公司
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Problems solved by technology
At present, the detection method of the grounding network of the power system is mainly realized by the local excavation method combined with the measurement of the grounding resistance. Connection operation status of the grounding grid
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Embodiment Construction
[0025] The present invention will be further described below in conjunction with the accompanying drawings.
[0026] See attached figure 1 , the measurement device in the figure includes grounding network, signal injection switch array 3, signal detection switch array 4, signal generation circuit 1, signal preprocessing circuit 2, signal conditioning circuit 5, analog-to-digital conversion circuit 6 and central processing control circuit 7 ; is characterized by:
[0027] a. The signal generation circuit 1 generates digital excitation signals of different frequencies under the control of the central processing control circuit 7, simulating various signals under natural conditions, and the digital excitation signal is subjected to digital-to-analog conversion and amplification and filtering processing through the signal preprocessing circuit 2 Afterwards, the grounding rod output of the signal injection switch array 3 is used as an excitation signal; the amplitude and phase inf...
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The invention relates to a measuring device for diagnosing the connecting state of a grounding network, which comprises a signal generating circuit, a signal preprocessing circuit, a signal injecting switch array, a signal detecting switch array, a signal conditioning circuit, an analog-digital converting circuit, a central processing control circuit and a PC (Personal Computer) machine. The device provided by the invention takes a grounding rod as a vector, signals are input into the grounding rod, response signals are output through the grounding rod, and the local connecting information ofthe grounding network is obtained through subsequent processing on the obtained signals. The device provided by the invention can simulate various signals under natural conditions, can position a malfunction point of the grounding network and realizes real-time monitoring diagnosis on the grounding network, thereby avoiding the blindness and inaccuracy caused by a local excavating method, greatlyshortening the repair time and simultaneously saving a great quantity of manpower and material resources.
Description
technical field [0001] The invention relates to a measuring device for diagnosing the connection state of a grounding grid. Background technique [0002] Grounding is to connect some parts of electrical equipment and a certain point of the power system to the earth, provide a leakage channel for fault current and lightning current, stabilize the potential, and provide a zero potential reference point to ensure the safe operation of the power system and electrical equipment. At the same time, ensure the personal safety of the power system operators. The ground grid plays an important role in the safe operation of the power substation. The parameter that characterizes the connection status of the grounding grid is the grounding resistance. The size of the grounding resistance reflects the ability of the grounding device to dissipate current and stabilize the potential, as well as the protection performance. The smaller the grounding resistance, the better the protection per...
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IPC IPC(8): G01R31/02G01R27/20G01R31/08
Inventor 何为徐征杨帆李冰鞠康冉鹏黄薏宸
Owner 四川宇峰科技发展有限公司