Intelligent arc extinguishing and overvoltage protection system

Abstract

The invention discloses an intelligent arc suppression and overvoltage protection system, which includes a power grid, an isolation switch module, a voltage mutual induction module, a control module, a vacuum circuit breaker module, a vacuum contact module, a voltage detection drive module, a control switch module, and a rectification and voltage stabilization module , infrared detection module and alarm module. Beneficial effects: the present invention can be used to detect the voltage of the power grid by setting the voltage detection drive module 7, and protect the power system from being burned by high voltage through the setting of the MOS tube. When a single-phase intermittent arc ground fault occurs, the control The device 4 sends an action command to the vacuum circuit breaker module 5 capable of single-phase operation, transforms the unstable arc grounding into a stable metal grounding, limits the overvoltage caused by the arcing grounding to the online voltage level, and greatly reduces the single-phase grounding arc. Time and the resulting insulation breakdown short circuit accident and arrester explosion accident.

Description

technical field [0001] The invention relates to the field of electric power protection, in particular to an intelligent arc suppression and overvoltage protection system. Background technique [0002] In the non-directly grounded system of the neutral point, the basis for forming the arc ground overvoltage is the intermittent arc. When a single-phase intermittent arcing grounding (hereinafter referred to as "arcing grounding") fault occurs in the neutral point indirect grounding system, the charge on the system's capacitance to ground will accumulate and Redistribution, causing high-frequency oscillatory overvoltages on the inductance-capacitance loop of the non-faulted phase. For overhead lines, the overvoltage amplitude can generally reach 3.1 to 3.5 times the phase voltage. The possibility of insulation breakdown of the power supply network dominated by cable lines or arc extinguishment at the zero-crossing point of arc high-frequency current is greatly increased. When ...

AI Technical Summary

Problems solved by technology

To solve the problem of arc grounding, the method of changing the grounding mode of the neutral point of the system was adopted in the early days, using small resistance grounding, and sacrificing the reliability of power supply to solve the problem of arc grounding; later, it was developed to adopt the principle of arc suppression coil, and use the different voltage and current characteristics of inductors and capacitors , the inductance current is used to compensate the capacitive current. Since the arc grounding is high-frequency, the arc suppression coil designed according to the power frequency cannot compensate the high-frequency current. On the contrary, the connection of the coil will also produce many side effects. With the development of urban and rural power grids And production and life have higher and higher requirements on the reliability of power supply. The damage caused by each accident and the spread are bound to increase. Various overvoltages pose a greater threat to the safe operation of equipment and power grids.

Images