Inductance regulation type self-tuning arc-extinguishing pressure-limiting device

Abstract

This invention relates to an induction-adjustment type automatic tuning, arc-suppression voltage-limiting device, being of a transformer direct connecting neutral point of electric power system. It has earthing type primary coil and two or more than two groups of high impedance secondary coil (with fine turing and coarse tuning); computer signal sources are in the current mutual inductor and voltage mutual inductor of said primary coil; the computer controls the switching of the fine tuning and coarse tuning. In this invention, single-phase transformer is used to realize precompensation and follow-up compensation during the production of capacitive current at primary earthing condition; the embodiment is that: PC-104 computer calculates the capacitive current of the system, and then controls the fine tuning and coarse tuning, proceeds compensation of the capacitive current.

Description

technical field [0001] The invention relates to a sensing-adjusting type automatic tuning arc suppression voltage limiting device, which belongs to the capacitive current compensation device of the neutral point ungrounded system of the electric power system. Background technique [0002] In the distribution network of 66KV and below in the power system, the neutral point is not grounded or the arc suppressing coil is grounded. In the past, the manual turn-adjusting arc suppressing coil was used. However, due to structural defects of the arc suppression coil, its function is limited, it cannot effectively extinguish the arc, and it is inconvenient to use, thus causing accidents to the power grid and causing economic losses. Therefore, at present, alternative products have been developed in this technical field, such as arc suppression coils with adjustable iron core gaps, on-load switch turn-adjustable arc suppression coils, capacity-adjustable arc suppression coils, magneti...

AI Technical Summary

Problems solved by technology

Although the alternative products have made progress, there are still shortcomings in actual use: for example, the turn-adjusting arc-suppression coil of the on-load switch has the shortcomings of the mechanical transmission part. It takes more than ten seconds to adjust a gear in normal times. The number is limited, so it cannot meet the needs of wide adjustment range and fine adjustment

Another example is the high-impedance arc-suppression coil, which adopts the adjustment method. The adjustment time for the fault is about 60ms, and the conduction angle is adjusted by the thyristor to generate the 3rd and 5th harmonics. It must be equipped with a filter device and the control circuit There are many electronic components and are relatively complicated. Since they are far away from the resonance point during normal operation, the suppression effect on ferromagnetic resonance overvoltage is poor.

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