Arc suppression coil grounding compensation device

Abstract

The invention discloses a grounding compensation device for an arc suppression coil, which belongs to the technical field of grounding arc suppression compensation devices for power distribution systems. It includes a neutral point grounding switch connected in parallel with the arc suppression coil. The arc suppression coil is connected with an intelligent switch to control whether the arc suppression coil is grounded. No grounding; when it is necessary to measure the capacitance and reactance of the system to the ground, the neutral point grounding switch is closed for a short time, and when the system occurs single-phase grounding or resonance causes the neutral point voltage rise to exceed the limit, the intelligent switch is automatically closed to ground the arc suppression coil, When the neutral point voltage is lower than the limit value, the intelligent switch is automatically disconnected, and the arc suppression coil returns to ungrounded. The invention realizes the advantages of instant and fast output compensation current and low neutral point displacement voltage, cancels the damping resistance, reduces the volume of the device, saves the cost, and avoids heat generation and loss.

Description

technical field [0001] The invention relates to a grounding compensation device for an arc suppression coil, belonging to the technical field of grounding arc suppression compensation devices for power distribution systems. Background technique [0002] In the power grid system with small ground current, the function of the arc suppression coil is that when a single-phase ground fault occurs in the power grid, the phase difference between the inductive current provided by the arc suppression coil and the ground capacitance current of the system flowing through the fault point is 180 degrees, and mutual compensation. Make the fault point current drop below the arc self-extinguishing current, achieve the purpose of arc extinguishing, prevent further expansion of the accident, and maintain the safe operation of the system. [0003] Most of the conventional pre-adjusted automatic tuning arc suppression coils use the neutral point displacement voltage caused by adjusting the arc ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a grounding compensation device for the arc suppression coil, which can output the compensation current immediately and quickly, and overcome the rise of the neutral point voltage during the operation of the pre-adjusted arc suppression coil and the current adjustment of the arc suppression coil. The problem of slow output and poor compensation effect, at the same time, the damping resistor is canceled, which reduces the size of the device, saves the cost, and avoids the heat and loss caused by the damping resistor, especially suitable for occasions where the unbalanced voltage of the power distribution system is high

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