Three-position on-load reactive capacity regulation switch

Abstract

The invention relates to a three-position on-load reactive capacity regulation switch for reactive power compensation regulation of a power system. The switch consists of an operation bus, a transition bus, an insulation shaft, a drive mechanism, a gear signal auxiliary joint, a drive motor, a cage body, a central shaft, a connecting rod, a capacitance disconnecting link switch, a disconnecting link operation locking disc, a transition disconnecting link locking wheel disc and a transition disconnecting link switch, and is characterized in that: multi-group switching of capacitors is finished by a group of variable series reactors, a group of switches and multiple capacitors; and the reactance can be changed when the system runs under an on-load condition. The three-position on-load reactive capacity regulation switch provided by the invention has the advantages that: switching of multiple groups of capacitors can be realized through a three-position disconnecting link switch by use of a zero-crossing load switch; and in combination with the variable-reactance series reactors, the group number of the capacitors is not limited. Through the invention, multi-group switching can be realized as necessary so that the switching-level capacity is reduced, the regulation is smooth and impact on the power system in the switching process is reduced.

Description

technical field [0001] The invention relates to a reactive power compensation adjustment device used in an electric power system, in particular to a three-position on-load and reactive power adjustment switch. Background technique [0002] Under normal circumstances, the reactive power of the power system changes at any time and needs to be tracked and adjusted. At present, there are basically two switching methods of power compensation and adjustment devices: one is capacitor series reactor, which is composed of switches in series to form groups of different capacities. Generally, the total adjustment amount is divided into three groups, arranged and combined into 7 gears; The unloaded switch is used, the capacitor is divided into two groups, and the series reactor is divided into three taps and three gears. Because the switch is unloaded, the reactor cannot change the tap when it is charged, and each operation must be switched. It is carried out in the case of a power out...

AI Technical Summary

Problems solved by technology

The main problems of the above two switching methods are: first, there are too many groups, because of the exponential growth of the number of groups due to equipment investment or land occupation; The number of operations is the largest; the switching capacity is large during the gear switching process, so the reactive power impact on the system is relatively large; the third is that the grouping is limited, the reactive power adjustment gradient is large, and the adjustment is not smooth, and the reactive power impact is likely to be caused during the switching process. Cause voltage fluctuations, which may cause overvoltage or large inrush current, affecting system safety

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