Step voltage calculation method under symmetrical double-core phase shift transformer load condition

Abstract

The invention relates to a step voltage calculation method under a symmetrical double-core phase shift transformer load condition. The calculation method comprises a step of determining rated current IN and series transformer power supply side voltage Us according to the rated pass capacitance S and the rated voltage UN of a phase-shifting transformer, a step of determining series connection transformer load side voltage UL according to the rated current IN,overall leakage impedance Z and power factor angle phi, and combined with the phase shift angle in an empty load, determining series connection transformer power supply side current Is and load side current IL, a step of determining excitation transformer primary side current IE1 and second side current IE2 according to the series connection transformer power supply side current Is and the load side current IL, a step of determining excitation transformer primary side voltage UE1 according to the series transformer power supply side voltage Us, the load side voltage UL excitation transformer primary side current IE1, and secondary side current IE2, and thus determining excitation transformer secondary side voltage UE2, and a step of determining a load tap-changer level voltage Ustep according to the excitation transformer secondary side voltage UE2. The invention provides a method for calculating overall leakage impedance Zn and a phase shift angle an in an empty load in a selected n gear of the phase shift transformer.

Description

technical field [0001] The invention relates to the technical field of transformer manufacturing, and more specifically, relates to a method for calculating the voltage of an on-load tap changer stage of a symmetrical double-core phase-shifting transformer under load conditions. Background technique [0002] As a method of eliminating overload and controlling the active power flow of the system, the phase-shifting transformer has been widely concerned by experts at home and abroad because of its advantages of convenient operation and little additional impact on the power system. The on-load tap-changer is a key component for adjusting the voltage phase-shifting angle of the phase-shifting transformer. The determination of its key technical parameters and reasonable selection will directly affect the design and reliable operation of the phase-shifting transformer. At this stage, the determination of the stage voltage of the on-load tap changer in the phase-shifting transforme...

AI Technical Summary

Problems solved by technology

At this stage, the determination of the stage voltage of the on-load tap changer in the phase-shifting transformer is firstly calculated under no-load conditions, and then the maximum stage voltage is determined according to a certain experience margin. Compared with ordinary transformers, the phase-shifting The structure of the transformer is complex, the design parameters are various, and there are two ways of leading regulation and lagging regulation, the magnitude of the load current and the phase difference with the load voltage vary greatly

Therefore, there is a lack of necessary theoretical research on the size of the step voltage and its influencing factors under load conditions, and the selection of on-load tap-changers cannot be realized economically and reliably according to the existing methods.

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