Parameter online test method for neutral point ungrounded system, storage medium and device

Abstract

The invention provides a capacitive current online test method for a neutral point ungrounded system, a storage medium and a device. The method comprises the steps: obtaining the ground capacitance ofa non-fault line; according to the ground capacitance of the non-fault line, obtaining the ground capacitance current of the non-fault line; calculating the ground capacitance of a faulty line according to the ground capacitance of the non-faulty line, the length of the non-faulty line and the length of the faulty line; calculating ground capacitance current of the fault line according to the ground capacitance of the fault line; and calculating bus capacitance current according to the ground capacitance current of the non-fault line and the ground capacitance current of the fault line. The invention further provides a low-current grounding line selection storage medium and an online test device. According to the method, the capacitance current of each bus and the capacitance current of each section of the bus are calculated on line, the calculation result can provide an effective basis for compensating the single-phase grounding current of the power distribution network, inhibiting intermittent arc light overvoltage, selecting the capacity and the installation position of the arc suppression coil and selecting PT equipment in time, and extra hardware devices do not need to be designed.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a parameter online testing method, a storage medium and a device of a neutral point ungrounded system. Background technique [0002] At present, the neutral point of my country's power distribution system generally adopts the non-direct grounding method. When the line is single-phase grounded, the current flowing through the fault point is actually the sum of the capacitive currents of the non-fault lines to the ground. my country's distribution network technical guidelines stipulate that a single-phase ground fault can operate with a fault for two hours. When the ground current is less than 10A, the arc at the fault point can usually be extinguished by itself. At this time, continuing to operate with a fault ensures the reliability of power supply to the greatest extent. However, according to statistics, a large part of the faults in the distribution network ar...

AI Technical Summary

Problems solved by technology

[0003] Traditional distribution network capacitive current testing methods adopt manual testing methods, and some methods require direct contact with primary equipment, which is dangerous, complicated to ope

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