A Harmonic Free Voltage Transformer

Abstract

The invention discloses a harmonic-free voltage transformer, which includes a working module, a main control unit and an operating device; the working module includes a voltage transformer and a resonance eliminator, and a conductive groove is provided at the central axis of the voltage transformer , a resonance eliminator is plugged inside the conduction tank, and one end of the resonance eliminator and the conduction tank are connected in series through current, so that the resonance eliminator and the voltage transformer are integrated; the main control unit includes a microprocessor device, memory, information collection module and timing module; the information collection module is respectively connected to the voltage transformer and the microprocessor, and the microprocessor is connected to the memory, the timing module and the operating device. The harmonic eliminator is detachably installed inside the conductive tank, which is convenient for replacement and maintenance, and effectively saves a lot of space; and effectively improves the intelligence of the system, facilitates the monitoring and maintenance of equipment, not only improves work efficiency, but also Enhanced security.

Description

technical field [0001] The invention relates to the technical field of a circuit protection device, in particular to a harmonic-free voltage transformer. Background technique [0002] Potential transformer is a kind of power equipment widely used in power system. It belongs to a transformer with iron core. It is composed of primary and secondary coils, iron core and insulating layer. However, the charge and discharge path of the relative ground capacitance of the power grid must pass through the primary winding of the voltage transformer. Once a ground fault occurs in the system, the impedance of the system network to ground tends to be inductive. At this time, if the ground inductance of the system network matches the ground capacitance, it will The formation of a three-phase or single-phase resonant circuit can excite various ferromagnetic resonance overvoltages and generate a large inrush current, which will increase the temperature of the voltage transformer or even burn...

AI Technical Summary

Problems solved by technology

However, the charge and discharge path of the relative ground capacitance of the power grid must pass through the primary winding of the voltage transformer. Once a ground fault occurs in the system, the impedance of the system network to ground tends to be inductive. At this time, if the ground inductance of the system network matches the ground capacitance, it will Forming a three-phase or single-phase resonance circuit can excite various ferromagnetic resonance overvoltages and generate a large inrush current, which will increase the temperature of the voltage transformer or even burn it out, so it is necessary to install a resonance eliminator

However, nowadays the voltage transformer box is too small to install an independent resonance eliminator. Therefore, the voltage transformer needs to be replaced at the same time when installing the resonance eliminator, which is cumbersome to operate and easily causes a lot of waste of resources.

Moreover, the harmonic eliminators currently on the market are not intelligent, and are not convenient enough to control and use, and cannot play a good protective role

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