Novel power transformer with functions of direct current magnetic bias and reactive compensation

Abstract

The invention relates to a novel power transformer with functions of direct current magnetic bias and reactive compensation. The novel power transformer comprises electric reactors and a transformer body, wherein the electric reactors wind transformer side masts, the transformer body comprises an iron core and windings, and the iron core comprises a first side mast, a second side mast, a main core mast and a two-phase magnetic material. By virtue of the special arrangement of the windings, the magnet integration of the electric reactors and the transformer body is realized, and the inductance can be invoked to perform reactive compensation; a current sensor is established to detect bias magnet flux, and the intelligent conversion of a magnetic conduction function and a direct current excitation function of the two-phase magnetic material can be realized through a control device so as to detect, control and eliminate the direct current magnetic bias of the transformer.

Description

technical field [0001] The invention relates to the field of electrical engineering, and specifically refers to a power transformer with intelligent features that integrates a controllable reactor and can realize DC bias compensation and reactive power compensation functions. Background technique [0002] Since the 1970s and 1980s, with the development of ultra-high voltage long-distance transmission systems and the aggravation of the impact of power system load changes, the reactive power consumption in the power grid is increasing day by day. The lack of reactive power is the cause of my country's low power quality and an important factor of waste. Controllable reactors and capacitor banks operate in coordination with each other to adjust reactive power. Therefore, in UHV or EHV, large-capacity power grids, a certain reactive power compensation device is installed to control the reactive power flow and stabilize the operating voltage of the power grid. A large number of t...

AI Technical Summary

Problems solved by technology

[0009] However, there are certain problems in each method

The small resistance current limiting method cannot completely eliminate the neutral point DC current, and sometimes a resistor with a larger resistance value has to be used, which may affect the insulation strength of the neutral point of the main transformer; although the capacitor DC blocking method can better eliminate the neutral point DC current. DC current, but it affects the effective grounding of the transformer. It has high requirements on the insulation strength of the neutral point of the main transformer, and its ability to deal with short-circuit faults in the power grid is poor; very difficult to choose

And in the long-distance power transmission system, the efficiency of the compensation current will be reduced, the power of the DC generator will be doubled, and the large current entering the ground will also increase the burden on the ground grid, accelerate the corrosion of the ground grid, and the application cost is extremely high; the potential compensation method consumes a lot of power , the device is more expensive, and the selection of the compensation ground pole is also more difficult

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