Power distribution network fault line selection method based on unique through-flow characteristic of resistive current
A distribution network fault and resistive current technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficult identification of the fault wave head of the fault waveform, weak fault signal, and difficulty in online practicality of the traveling wave method. , to achieve correct and reliable line selection results
Inactive Publication Date: 2016-08-17
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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[0013] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0014] figure 1 It is a zero-sequence network diagram of a single-phase grounding fault in a distribution network before parallel resistance switching using the method of the present invention. This embodiment further illustrates the technical solution of the present invention by taking a single-phase ground fault occurring on the nth feeder line of the distribution network whose neutral point is grounded through an arc suppressing coil as an example. In this implementation, the zero-sequence voltage of the distribution network bus is measured first like Then measure the zero-sequence current flowing through the 1st, 2nd, ..., n-1, n distribution network feeders respectively Among them, n is the number of distribution network feeders; is the phase voltage of the busbar during normal operation of the distribution network.
[0015] After a...
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The invention discloses a power distribution network fault line selection method based on a unique through-flow characteristic of a resistive current. The method comprises the steps: firstly measuring a zero sequence voltage of a bus of a power distribution network and a zero sequence current of each feed line in the power distribution network; carrying out the switching of a parallel resistor after fixed time delay if the amplitude value of the zero sequence voltage of the bus of the power distribution network is greater than 15% of the amplitude value of a phase voltage of the power distribution network during normal operation; measuring the zero sequence voltage of the bus of the power distribution network and the zero sequence current of each feed line in the power distribution network again; respectively calculating the resistive current of each feed line in the power distribution network, and selecting the feed line, corresponding to the maximum amplitude value of the resistive current, in the power distribution network as the fault feed line. The method achieves the fault line selection of the power distribution network through the characteristic that there is only one resistive current passing through the fault feed line, and the result of line selection is not affected by a transition resistor, the position of a single-phase grounding fault point, line parameters and a line length. The method is simple in principle of line selection, is accurate and reliable in line selection result, and is high in practicality.
Description
technical field [0001] The invention relates to the technical field of line selection for faults in power system distribution networks, in particular to a fault line selection method for distribution networks based on the unique characteristic of resistive current flow. Background technique [0002] After a single-phase fault occurs on the outlet line of the distribution network whose neutral point is grounded by the arc suppression coil, the inductive current provided by the arc suppression coil compensates the capacitive current of the ground point of the fault line. The zero-sequence current of the line is still small, so that the distribution network fault line selection method based on the zero-sequence current method ("New Criteria for Small Current Grounding Line Selection Based on the Transient Maximum Value of Zero-Sequence Current" published by Zhang Fan, Pan Zhencun, and Zhang Huifen) ) The line selection results are not reliable enough. Due to the compensation e...
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Login to View More IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 曾惠敏
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD