Arc and resonance elimination comprehensive device for power grid

Abstract

The invention discloses an arc and resonance elimination comprehensive device for a power grid, which solves the problems that the conventional arc elimination cabinet cannot determine a circuit in which arc light is generated and an arc suppression coil cannot limit intermittent arc overvoltage and cannot eliminate high-frequency intermittent arc grounding. The device comprises a high energy voltage limiter, a vacuum contactor, a current limiting fuse, a controller and a voltage transformer; and an operation module of the controller performs operation processing on information sent by a main measurement module, a main control module and a line selection module, and the controller sends an instruction to control the vacuum contactor to correctly act so as to eliminate the arc and the resonance and select a line. The arc and resonance elimination comprehensive device can completely eliminate arc grounding and the resonance of a power grid system, and reliably realizes segment protection for the power grid system and equipment; and a defect that the conventional arc and resonance elimination cabinets use and all act in the same potential is overcome.

Description

technical field [0001] The invention relates to an electrical device, in particular to a comprehensive device for arc suppression, harmonic elimination, and line selection, which is used in a power grid system with a 6-66kV neutral point ungrounded operation mode. Background technique [0002] The neutral point is not grounded system, when the single-phase is grounded, it can run with faults for a short time, and the power supply reliability is high. With the expansion of the scale and the increase of cable outlets, the capacitance current of the system to the ground also increases accordingly. After the single-phase grounding, the current flowing through the fault point is relatively large, and the arc is not easy to extinguish. The resulting arc overvoltage and resonance overvoltage can reach More than 3.5 times the normal value, it is very harmful to the power grid system. Statistics show that arc light grounding faults account for more than 60% of all faults in the powe...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the arc suppression cabinet cannot determine the line where the arc occurs and the arc suppression coil cannot limit the intermittent arc overvoltage, and cannot eliminate the high-frequency intermittent arc grounding, the purpose of the present invention is to propose a comprehensive device for arc suppression, harmonic elimination and line selection. Integrating three functions into one, it is widely used in the neutral point ungrounded grid system

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