Power distribution network intermittent arc grounding fault simulation testing device and method
A ground fault and simulation test technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficult arc description and low reliability of test results, and achieve the effect of wide application range and high reliability
Inactive Publication Date: 2016-12-07
STATE GRID CORP OF CHINA +1
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Problems solved by technology
Therefore, it is difficult to construct an accurate simulation model to describe the arc, and the reliability of the test results is low when testing through the secondary signal injection method
[0005] To sum up, there is currently no reliable performance test method and test equipment for single-phase ground fault location devices dealing with intermittent arc ground faults
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[0024] Below will be further described in conjunction with accompanying drawing and the content of invention:
[0025] see figure 1 As shown, the present invention is a distribution network intermittent arc ground fault simulation test equipment, including: a fuse 1, a circuit breaker 2, a large-capacity resistor 3, an arc discharge model 4 and a voltage transformer 5.
[0026] One end of the fuse is connected to the line through an insulated wire and a lap fitting, the other end of the fuse is connected to one end of the circuit breaker, the other end of the circuit breaker is connected to a large-capacity resistor, and the other end of the large-capacity resistor is connected to the high voltage of the arc discharge model 4 The ground electrode 42 of the electrode 41 and the arc discharge model is grounded through an insulated wire; the output end of the voltage transformer for collecting the ground voltage on the line between the fuse 1 and the circuit breaker is connected ...
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The invention discloses a power distribution network intermittent arc grounding fault simulation testing device and method. The testing device comprises a fuse, a breaker, a high capacity resistor, an arc discharge model and a voltage transformer. One end of the fuse is connected with one phase of a line through an insulation lead and an overlap-joint fitting, the other end of the fuse is connected with one end of the breaker, the other end of the breaker is connected with the high capacity resistor, the other end of the high capacity resistor is connected with a high voltage electrode of the arc discharge model, and a grounding electrode of the arc discharge model is grounded through the insulation lead. A controller of the arc discharge model collects the voltage frequency and the phase of a tested line. The rotation speed and the position of a stepping motor of the arc discharge model are controlled through pulse signals. Therefore, the discharge frequency and the discharge phase of intermittent arc discharge are enabled to be controllable. The invention achieves simulation of the distribution line intermittence arc grounding phenomenon by the breaker, the high capacity resistor and the arc discharge model.
Description
【Technical field】 [0001] The invention belongs to the technical field of electric power test, and in particular relates to a simulation test device and method for an intermittent arc-flash grounding fault of a power distribution network. 【Background technique】 [0002] my country's 3-66kV distribution network generally adopts the working mode of not grounding the neutral point or grounding through the arc suppression coil. In this working mode, when a single-phase grounding fault occurs, the current flowing through the grounding point is very small, so it is often called a small current grounding system. The low-current grounding system has the highest probability of single-phase ground faults, which can account for 80% of the total faults. With the expansion of the scale of the distribution network and the further deepening of the transformation of urban and rural power grids, especially the extensive use of cable lines, the capacitive current of the system increases. When...
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 刘健张小庆权立申巍张志华
Owner STATE GRID CORP OF CHINA