A method of line selection for single-phase grounding faults in small current grounding systems
A single-phase grounding fault, small current grounding technology, applied in the fault location, detecting faults according to conductor types, measuring electricity and other directions, can solve the problem of insurmountable system fault line selection obstacles, sampling equipment difficult to capture fault signals, steady-state signals Small amplitude and other problems, to achieve the effect of low sampling accuracy requirements, wide application range, and good feature extraction ability
Active Publication Date: 2021-06-25
GUANGXI UNIV
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Problems solved by technology
[0006] The present invention mainly solves the problems in the prior art that the small current grounding line selection steady-state method has a small steady-state signal amplitude, less information, is easily submerged by noise, and cannot overcome the arc suppression coil grounding method. Line selection obstacles, and the technical problem that sampling equipment is difficult to capture fault signals in the transient method, provides a single-phase ground fault line selection method for small current grounding systems
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Embodiment
[0073] In this embodiment, a single-phase grounding fault line selection method for a small current grounding system, the steps are as follows:
[0074] S1. Collect the three-phase voltage V and three-phase current I of each outgoing line in the substation, and calculate the active power P, reactive power Q, and power factor of each outgoing line save the parameters;
[0075] In step S1, the three-phase voltage V and the three-phase current I are collected by the three-meter method, and the circuit structure of the collection is as follows image 3 shown, where V a , V b , V c is the three-phase voltage, I a , I b , I c is the three-phase current, Z a ,Z b ,Z c for a three-phase load.
[0076] At s points of weekly wave sampling, the present embodiment takes 32 sampling points as an example, and then each parameter is calculated as follows:
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[0082] In order to reduce network transmission pressure and redu...
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The invention relates to a line selection method for a single-phase grounding fault in a small current grounding system. The method includes: collecting the three-phase voltage V and the three-phase current I of each outgoing line in the substation, calculating the active power P, reactive power Q, and power factor of each outgoing line and saving each parameter; obtaining the characteristic matrix X according to the saved parameters * ; Construct a deep belief network DBN; the feature matrix X * Input to DBN for training, obtain DBN suitable for fault line selection; carry out fault line selection. The invention adopts the effective value of the three phases of the outgoing line instead of the instantaneous value, has low requirements on the sampling accuracy of the data acquisition device, and has higher economical efficiency. There is no need to detect the change of the zero-sequence current of each outgoing line, and there is no need to consider the grounding method of the neutral point of the system, and the application range is wider.
Description
technical field [0001] The invention relates to the field of single-phase grounding faults in small current grounding systems and deep learning, in particular to a line selection method for single-phase grounding faults in small current grounding systems. Background technique [0002] The distribution network of 60kV and below in my country widely adopts the low-current grounding method. When a single-phase ground fault occurs in the line, the fault phase voltage tends to zero, and the non-fault phase voltage rises to the phase voltage times, the fault current is much smaller than the load current. At this time, the line voltage of the power grid remains symmetrical and does not affect the load power supply. Therefore, the regulations stipulate that it is allowed to continue to run for 1-2 hours, so that the maintenance personnel have enough time to find the grounding point. However, in the actual operation process, failure to cut off the faulty line in time may escalate t...
Claims
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IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/086G01R31/088G01R31/50
Inventor 韦化韦洪波张弛祝云古雄李占龙杨东旭吕中梁陈骥冯显力
Owner GUANGXI UNIV