SU1536477A1 - Method of checking permissible time of synchronizer lead - Google Patents

Abstract

This invention relates to electrical engineering and is intended to automatically control the allowable advance time of a synchronizer. The purpose of the invention is to simplify the method. At the time of the synchronizer triggering, two rectangular pulses of different duration are formed, the duration of the first of them corresponds to the minimum allowable amount of advance time of the synchronizer, and the duration of the second - the maximum allowable amount of advance time of the synchronizer

at the time of the occurrence of a zero phase shift between voltages applied to the synchronizer inputs, a single pulse is formed, and if its leading edge coincides with the moment of time characterized by the presence of the first and second square impulses, the timing advance time is short, if with a moment of time characterized by having only a second rectangular pulse, then the timing of the synchronizer is normal, if with a moment of time characterized by the absence of rectangular pulses, then the leading time of the syn ronizatora large. 1 il.

Description

The invention relates to electrical engineering and is intended to automatically control the timing of the advance of the synchronizer.

The purpose of the invention is to simplify the method.

The drawing shows timing diagrams for an explanation of the method.

At the time of triggering of the synchronizer (point te in the drawing), a first rectangular pulse is formed with a duration equal to the minimum allowable amount of advance time of the synchronizer (diagram a), as well as a second rectangular pulse with

duration equal to the maximum allowable amount of advance time of the synchronizer (diagram b). The moment of zero phase shift between the synchronizer voltages is determined and a single impulse is formed (diagram c). If this impulse varies in the time interval tQ, tf, then the forward time of the synchronizer is less than the norm; if in the interval t, ta, then it is normal, and if later than at the moment of tit, then the timing of the synchronizer is more than the norm.

The timing diagram shows that the interval t0, t, is characterized by

ate

Ltd

4 1 1

the difference between the first and second rectangular impulses, the interval t4, the presence of only the second rectangular impulse, and if more time than the interval sn, t2 took place since the synchronizer was operated, then in this case at the time of coincidence of the phases of the mains voltage and the synchronized generator there will be no rectangular impulse.

Claims (1)

Invention Formula The method of controlling the allowable timing of the synchronizer ahead by determining the timing of the synchronizer and the time of the occurrence of a zero phase shift between voltages applied to the inputs of the synchronizer Pa, characterized in that, for the sake of simplicity, at the time of triggering of the synchronizer, two rectangular pulses of different duration are formed, the duration of the first of them corresponds to the minimum allowable amount of advance time of the synchronizer, and the duration of the second is the maximum allowable amount of advance time of the synchronizer, at the time a zero phase shift between the voltages applied to the synchronizer inputs form a single impulse, and in case a single impulse is formed during only the existence of the second rectangular pulse is fixed allowable time advance.