A high resistance control method for fault line selection

Abstract

The invention provides a high-resistance control method for fault line selection. The method comprises: when occurrence of a permanent ground fault in a distribution network system is determined, a controller carries out high resistance switching, inputs a specific-resistance current signal into the system, and determines a fault line; and the specific-resistance current signal flows on a fault line between a system power supply and a ground point. According to the invention, a problem of inaccurate line selection in line selection and arcing ground over-voltage according to a way of grounding of a neutral point by an arc suppression coil in a distribution network can be solved effectively.

Description

technical field The invention relates to the technical field of power grid systems, in particular to a high-resistance control method for fault line selection. Background technique In recent years, with the continuous development of the power system, the scale of the distribution network is also increasing. In the distribution network, cables are widely used to replace traditional overhead lines. The capacitance of the system line to ground increases significantly. When a single-phase ground fault occurs in the system When , the capacitance current to ground increases, which will affect the safe and reliable operation of the power system. At present, in the distribution network system, the operation mode in which the neutral point is grounded through the arc-suppression coil is mostly used. When the system has an instantaneous single-phase ground fault, it can be eliminated by the action of the arc-suppression coil to ensure that the system is continuously powered; when it ...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that in the grounding system of the neutral point through the adjustable arc suppression coil, when a single-phase ground fault occurs in the system, if the arc suppression coil is not reliably connected, the charge on the ground capacitance cannot pass through the neutral point. It can only be released from the voltage transformer, so a high-amplitude surge current will be formed in the voltage transformer, causing the voltage transformer to burn out

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