System for removing damp resistance discharging secondary arc-eliminating coil and its resonance

Abstract

A resonance eliminating method for the secondary side of an arc extinction wire includes the steps as: 1)add a secondary winding on the arc extinction wire; 2)link buffer resistance to the secondary winding and adjustable silicon trigger circuit; 3)under normal running, the adjustable silicon is conducting and the arc extinction wire runs around resonance point, and the resistance restrains neutral point voltage increase. When the system links to earth, the neutral point voltage excesses the limitation and monitored by voltage transformer which makes the adjustable silicon triggers the control circuit and shut off resistance circuit.

Description

technical field [0001] The invention relates to a method in the field of electrical technology, in particular to a method for eliminating system resonance on the secondary side of a damping resistance arc suppression coil. Background technique [0002] The arc suppression coil is widely used as a compensation element when a single-phase ground fault occurs in the system. At present, the widely used turn-adjusting arc suppressing coil usually runs near the resonance point, and a damping resistor must be installed to prevent the arc suppressing coil from resonating with the ground capacitance in the power grid system, and to limit the neutral point voltage of the system within the safe operating range. . [0003] After searching the literature of the existing technology, it was found that the literature of the fifth issue of "High Voltage Technology" in 2005: "Analysis of the Operation of the Arc Suppression Coil After Adding a Damping Resistor" mentioned: The arc coil, whos...

AI Technical Summary

Problems solved by technology

The installation of damping resistors on the primary side of the arc suppression coil has played a significant role in the safe operation of the power grid, but this method also brings unsafe factors to the system: 1. Since the damping resistor is a primary device of the system, operating experience has proved that the damping resistor is Switching control should not be achieved through secondary control. The best control method is to use the voltage on the resistor to automatically control. If the resistor is not selected properly, or the system itself has a large degree of imbalance, improper grounding taps, phase loss, and disconnection , when the grounding disappears, it is easy to cause the three-phase unbalance problem in the system

2. When a ground fault occurs, if the damping resistor cannot be removed in time, the inductance current compensated by the arc suppression coil will flow, which may burn the damping resistor, and eventually cause the arc suppression coil to quit operation, causing great harm to the system

3. The damping resistor runs in the primary system, the equipment and its protection performance requirements are improved, and the cost of the product is increased

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