A process control method for 10kv power grid grounding fault

Abstract

The invention discloses a process control method for a ground fault in a 10kV power grid, comprising: when a ground fault occurs in a 10kV power grid, a controller controls the grounding transformer to connect to an arc-suppression coil to compensate the 10kV power grid; the controller judges whether the ground fault is within a limited time If so, it is determined that the ground fault is an instantaneous ground fault, and the controller controls the arc suppression coil to exit the compensation at the end of the grounding; if not, it is determined that the ground fault is a permanent fault, and the controller controls the high-voltage contactor It is in the closed state to control the grounding transformer to connect to the small resistance; one end of the small resistance is grounded, and the other end is connected to the high-voltage contactor; the controller controls the arc suppression coil to exit the compensation when the permanent fault grounding ends, and controls the high-voltage contactor to break open state to exit the small resistor. The process control method for the 10kV power grid grounding fault provided by the invention has the advantages of automatic switching, high safety and reliability.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a process control method for a 10kV power grid ground fault. Background technique [0002] With the development of the power grid, the capacity of the power grid is getting bigger and bigger, the reliability of the power grid is getting higher and higher, and higher requirements are put forward for intelligence. As a link in power system generation, transmission, distribution and power consumption, the distribution network plays a link between the past and the future, and its importance has been paid more and more attention. However, the handling of distribution network ground faults has always been a problem for the majority of power grid operators. major problem. The traditional grounding method has exposed more and more disadvantages, and it is urgent to find a new and more perfect grounding method on the existing basis to meet the development needs of distribution netw...

AI Technical Summary

Problems solved by technology

[0006] ① Non-instantaneous single-phase ground faults cannot be automatically removed, and the entire power distribution system must withstand power frequency overvoltage (line voltage) for a long time, so the insulation level of the equipment is high;

[0007] ② It cannot automatically distinguish between non-instantaneous ground faults and instantaneous ground faults, and treat them differently;

[0008] ③The long-term existence of ground fault is not conducive to equipment and personal safety, and there are potential safety hazards;

[0009] ④Unable to coordinate with the distribution network automation system

The reason is that there are few faults on the cable itself, and most of the faults occur at the cable joints, which increases the number of permanent faults and phase-to-phase short-circuit faults, but the grounding of the cable network does not necessarily mean permanent faults or phase-to-phase short-circuits.

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