Power Transformer System Automatically Suppressing Negative Sequence Voltage

Abstract

The invention provides a power transformer system for automatically suppressing a negative sequence voltage. The system comprises a three-phase transformer, a joystick, a transmission mechanism, a servo motor and a negative sequence voltage detection control system, wherein the three-phase transformer comprises a first iron core column, a second iron core column, a third iron core column, two ironyokes, three primary windings, three secondary main windings and three adjustable secondary negative sequence voltage suppression windings; the first iron core column, second iron core column and third iron core column are respectively wound with the primary windings, secondary main windings and adjustable secondary negative sequence voltage suppression windings; the negative sequence voltage detection control system is respectively connected to the output end of the secondary winding of the three-phase transformer and the servo motor, the servo motor is connected to the joystick through thetransmission mechanism, and the joystick is connected to the adjustable secondary negative sequence voltage suppression windings. A power transformer system for automatically suppressing a negative sequence voltage provided by the invention can reduce the negative sequence voltage components caused by power generation, transmission and distribution, reduce the loss of transmission lines, improve the quality of the transmission and distribution, and ensure the safety of the power grid.

Description

technical field [0001] The invention relates to the field of power transformers, in particular to a power transformer system for automatically suppressing negative sequence voltage. Background technique [0002] Due to the three-phase impedance mismatch of three-phase generators, transformers, and power transmission systems, as well as the unbalanced three-phase loads caused by single-phase motors, single-phase heating furnaces, lighting, and household appliances, etc., there are positive sequence and negative sequences in the three-phase power system. Sequence and zero-sequence voltage components, of which the positive-sequence component is required by the power system, while the negative-sequence and zero-sequence components increase the loss of the grid line, aggravate the vibration of the transformer and the motor, and reduce the efficiency, and it is easy to cause the action of the relay protection device and affect the power grid. safe operation. Therefore, minimizing...

AI Technical Summary

Problems solved by technology

[0004] Three-phase AC motors, three-phase transformers, and power transmission systems adopt three-phase symmetrical designs, but they cannot be strictly guaranteed in processing, manufacturing, construction and use, such as partial short-circuits in iron cores in three-phase AC motors and three-phase transformers, inter-turn short-circuits in windings, The stator core is eccentric, and the impedance of the three phases in the grid is not equal

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