A Method of Fault Identification and Initial Time Calibration for Dynamic Grounding Processing Device
A technique for fault identification, inception time, applied in the direction of fault location, fault detection by conductor type, short-circuit test, etc.
Active Publication Date: 2022-03-04
李景禄
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Problems solved by technology
[0004] Aiming at the key problems to be solved by the current distribution network neutral point intelligent dynamic grounding complete set device, the present invention invents a method for fault identification and start time calibration of a dynamic grounding processing device
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[0017] It consists of grounding transformer (1), arc suppression circuit switch (2), resistance circuit switch (3), adjustable arc suppression coil (4), arc suppression coil damping resistor (5), damping resistance short circuit switch (6), The resistor (7), the neutral point voltage transformer (8) and the computer measurement and control system (9) form a dynamic grounding complete set. The complete set of equipment is suitable for substations where zero-sequence current transformers are installed on each feeder. The secondary measurement signal of zero-sequence current transformers is sent to the computer controller, and the computer controller must also be able to control the feeder switches of the substation.
[0018] When the complete set of equipment is connected to the power grid, the arc suppression circuit switch is closed, the resistance circuit switch is open, and the damping resistance short circuit switch is open, the distribution network first runs at the state w...
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The invention discloses a fault identification and initial time calibration method of a dynamic grounding processing device. The invention eliminates the power grid by comparing the increment of the neutral point displacement voltage and the subsequent dynamic change and the correlation comparison with the zero-sequence current in the feeder line. The change of operation mode, the adjustment of arc suppression coil measurement and the unstable grounding of the power grid will all cause disturbances; by comparing the increment of the neutral point displacement voltage and the subsequent dynamic changes and the correlation with the zero-sequence current in the feeder to identify the stable unit of the distribution network Phase-to-ground fault and the start time of the fault; by comparing the increment and subsequent dynamic changes of the neutral point displacement voltage and the correlation comparison with the zero-sequence current in the feeder, the judgment of the nature of the single-phase to ground fault is solved, especially for the asymmetrical power grid Judgment of the fault nature of high resistance grounding.
Description
technical field [0001] The present invention mainly relates to the field of neutral point grounding of distribution network, and particularly refers to a fault identification and start time calibration method of a dynamic grounding processing device, which is used for fault identification and starting time of a dynamic grounding processing device of a distribution network neutral point calibration. Background technique [0002] The distribution network neutral point intelligent dynamic grounding complete set is a combination of the advantages of the arc suppressing coil grounding method and the small resistance grounding method, and can avoid the shortcomings of these two grounding methods. Instantaneous single-phase ground faults occur in the distribution network When the nature of the fault can be intelligently judged and targeted treatment can be adopted, the instantaneous ground fault can be eliminated, the insulation of the fault point can be quickly restored, and the r...
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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/52
Inventor 李景禄
Owner 李景禄