Electric network grounding compensation device based on arc suppression transformer

Abstract

The invention relates to an electric network grounding compensation device based on an arc suppression transformer. The electric network grounding compensation device comprises the arc suppression transformer connected with an electric network bus, wherein the arc suppression transformer is a three-phase five-pole type arc suppression transformer of which the primary side winding is in star-shaped connection with a neutral point directly grounded, and the secondary side winding is of an opening delta connection type, a secondary side opening end of the three-phase five-pole type arc suppression transformer is connected with an active inverter regulating device used for outputting compensating voltage to the arc suppression transformer, and the controlled end of the active inverter regulating device is connected with a controller used for controlling the active inverter regulating device to output compensating voltage. According to the electric network grounding compensation device, the number of equipment mounted in a primary system is smaller; and when the system generates a grounding failure, the compensating state of the arc suppression transformer can be directly regulated through the active inverter regulating device, so the fast compensation of great-capacitance current when the system generates the grounding failure is realized, and the electric network grounding compensation device has the advantages of high compensating speed, low cost, small occupied area and the like.

Description

technical field [0001] The invention relates to the technical field of power distribution network grounding, in particular to a device for performing arc suppression compensation for the power grid when the power grid is grounded. Background technique [0002] In my country's 6-66kV power system distribution network, when the system-to-ground capacitance current reaches more than 10A, the arc generated by a single-phase grounding fault cannot be automatically extinguished, and it is easy to cause two-phase short-circuit or more serious faults, reducing the power of the system. The reliability of the power supply endangers the safe operation of the equipment, so it is necessary to install a compensation device to compensate the capacitive current in the system to reduce the fault current at the grounding point. [0003] At present, the commonly used compensation device is the neutral point grounding compensation device, which generally includes a grounding transformer, an arc ...

AI Technical Summary

Problems solved by technology

Although this patented technology removes the arc suppression coil, it adds an adjustable reactor on the low-voltage side, so it is basically similar in terms of floor area and construction cost, and there is no fundamental improvement in performance.

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