Y-type wiring-based anti-resonance voltage transformer with grounding compensation function

Abstract

The invention discloses a Y-type wiring-based anti-resonance voltage transformer with a grounding compensation function. The anti-resonance voltage transformer comprises a PT primary winding, a PT secondary winding and an iron core. A neutral point of the PT primary winding is connected with a damping resistor in series and is grounded, a compensation reactor is connected between the neutral point of the PT primary winding and the damping resistor in series, and the two sides of the damping resistor are provided with a control switch assembly in parallel, wherein the control switch assembly can quickly short-circuit the damping resistor when the system has a single-phase earth fault so as to enable the compensation reactor to realize a grounding compensation function. The PT primary winding adopts Y-shaped wiring and is grounded through the compensation reactor and the damping resistor, and the damping resistor is automatically switched in or switched out under the control of a self-triggering bidirectional silicon controlled rectifier switch; when the system is normal, the damping resistor is switched in, and PT series resonance voltage rise can be inhibited; when the system has the single-phase earth fault, the self-triggering bidirectional silicon controlled rectifier switch is quickly in short circuit with the damping resistor, and the compensation reactor outputs an inductive current to compensate the earth capacitance current of the power grid, so that the earth compensation function is realized.

Description

technical field [0001] The invention relates to the technical field of power system power distribution, and more specifically relates to an anti-resonance voltage transformer with a grounding compensation function based on a Y-shaped connection. Background technique [0002] A voltage transformer, similar to a transformer, is an electrical device used to transform voltage. However, the purpose of transforming the voltage of the transformer is to facilitate the transmission of electric energy, so the capacity is very large, and it is generally calculated in kilovolt-ampere or megavolt-ampere; The power supply of the protection device is used to measure the voltage, power and electric energy of the line, or to protect the valuable equipment, motor and transformer in the line when the line fails. Therefore, the capacity of the voltage transformer is very small, generally only a few volts, Dozens of VA, the maximum is no more than 1000 VA. [0003] In the 6-66kV power grid neu...

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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to provide an anti-resonance voltage transformer with grounding compensation function based on Y-type wiring, so as to solve the problem that the current method of preventing and suppressing ferromagnetic resonance affects the measurement accuracy of PT secondary voltage, complicated wiring, and reliability Not high, narrow scope of application, PT easy to burn problems, to suppress PT series resonance voltage rise, and when the system single-phase ground fault, can compensate the reactance output inductive current to compensate the ground capacitance current of the power grid, and realize the ground compensation function

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