An intelligent judgment and processing method for multiple ground faults in distribution network
A technology of ground fault and processing method, which is applied in the direction of fault location, fault detection according to conductor type, electrical components, etc., can solve problems affecting power supply reliability, accident expansion, multiple ground faults in distribution network, etc., and improve fault handling capabilities , strong operability, and the effect of improving accuracy
Active Publication Date: 2022-05-24
李景禄
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Problems solved by technology
[0002] In southern thunderstorm weather, when a single-phase ground fault occurs in the distribution network, the ground fault processing device is used to deal with the single-phase ground fault. , due to various reasons, the fault line cannot be removed in time, and multiple ground faults occur in the distribution network during the fault duration, which will affect the judgment and treatment of the nature of the ground fault by the ground fault processing device
If multiple grounding faults cannot be correctly judged and handled, it will not only affect the reliability of power supply, but also expand the accident and endanger personal safety and grid safety in severe cases.
[0003] At present, the existing ground fault processing device can only deal with a single ground fault, because the characteristic parameters of the fault do not change significantly when the ground fault persists, and the ground fault processing device cannot identify the fault that occurs again during the continuous period of the ground fault from the characteristic parameters of the ground fault. Variations caused by multiple ground faults, such that current ground fault handling devices are unable to identify and deal with multiple ground faults occurring again during the duration of the ground fault
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[0013] When the ground fault processing device determines that a permanent high-resistance ground fault occurs in the distribution network, when the ground fault line is selected, the fault line is not removed, and the device is not reset. A stable increment ΔU occurs N ≥δ, and at the same time there is a stable increment Δi in the zero-sequence current in the feeder 0 ≥ξ, then it is determined that a single-phase ground fault occurred in the distribution network during this period, and the fault point-to-ground impedance of the subsequent fault is smaller than the ground-to-ground impedance of the previous fault point, the subsequent fault is a phase fault with the same name, and the subsequent fault line is zero Lines with stable increments of sequence current; if the neutral point displacement voltage of the distribution network has a stable increment ΔU N 0 ≥ξ, it is determined that the same-name phase high-resistance grounding fault occurs again in the distribution netwo...
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An intelligent judgment and processing method for multiple ground faults in a distribution network. The ground fault processing device judges that a permanent ground fault has occurred in the distribution network. When the ground fault line is selected, the fault line is not cut off, the device is not reset, and the ground fault lasts, Detect the change of the fault characteristic parameters of the distribution network again, and judge whether multiple ground faults have occurred according to the change of the fault characteristic parameters, and select the subsequent grounding line.
Description
technical field [0001] The invention relates to the field of single-phase grounding fault processing of power distribution network, and is the intelligent judgment and processing of multiple single-phase grounding faults of power distribution network. Background technique [0002] In the thunderstorm weather in the south, when the single-phase grounding fault occurs in the distribution network, the grounding fault processing device is used to deal with the single-phase grounding fault and the single-phase grounding fault is not removed. When the fault continues, multiple single-phase grounding may occur in the distribution network. , due to various reasons, the fault line cannot be removed in time, and multiple ground faults occur in the distribution network during the continuous fault period, which will affect the judgment and processing of the ground fault nature by the ground fault processing device. If multiple ground faults cannot be correctly judged and handled, it wil...
Claims
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IPC IPC(8): H02H7/26G01R31/08G01R31/52
CPCH02H7/26G01R31/086H02H1/0007Y04S10/52
Inventor 李景禄
Owner 李景禄