A method and system for switching on and off with phase selection

Abstract

The invention discloses a phase-selection closing switching method and system. The method and the system are applied to a phase-selection closing device which is used for controlling a circuit breakerof a high-impedance transformer. The method comprises the steps of acquiring a site variable of a control site; and inputting the site variable to a self-adaptive closing model which is trained in advance to obtain a time compensation parameter, and performing phase-selection closing control on the circuit breaker by the compensated control parameter, wherein the time compensation parameter is used for enabling the phase-selection closing device to compensate a control parameter. The self-adaptive closing model which is trained in advance is used for calculating the site variable, the time compensation parameter output from the model is used for correcting the control parameter of the phase-selection closing device, so that the phase-selection closing device used for controlling the circuit breaker can be used for fully considering influence of external factors such as a running environment, circuit breaker accumulated action frequency, oil pressure and SF6 air pressure, and the excitation surge of the high-impedance transformer during switching is reduced.

Description

technical field [0001] The present application relates to the field of circuit breakers, and more specifically, to a method and system for switching on and off with phase selection. Background technique [0002] In the 1980s, ABB and Alstom launched F236 and RPH2 phase selection closing devices respectively. The technical principle is: use the AC voltage of each phase to close the switch when it crosses zero (0 degrees and 180 degrees). Effectively solve the problem of charging inrush current of AC filter bank. But there are also the following limitations: the operation of the circuit breaker is required to be very stable, and the discreteness of the continuous operation of the circuit breaker is generally required not to exceed 1ms. Therefore basically all must carry out the cooperative use with the switch that self produces, can't carry out effective cooperation with the switch of other manufacturers. So for a long time, this technology and products have been monopolize...

AI Technical Summary

Problems solved by technology

But there are also the following limitations: the operation of the circuit breaker is required to be very stable, and the discreteness of the continuous operation of the circuit breaker is generally required not to exceed 1ms

[0004] In recent years, there have been many new situations in the power grid when high-impedance transformers are put into operation, with large inrush current amplitudes and slow attenuation, which has a negative impact on the backup protection of transformers and adjacent equipment.

At present, most of the relevant literatures analyze the influence of ordinary transformer excitation inrush current and inrush current amplitude characteristics on transformer differential protection. There is a lack of research on the attenuation law of sequence components and its impact on transformer zero-sequence overcurrent protection and line zero-sequence protection; there is even a lack of research on inrush current suppression technology for high-impedance transformers

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