Journal of Electrical Engineering ›› 2019, Vol. 14 ›› Issue (4): 98-105.doi: 10.11985/2019.04.015

Previous Articles     Next Articles

Suggestions on Mark Shift of Clock Ordinal Number Label in Connection Group of International and National Standards

Yannian YANG   

  1. CRRC Zhuzhou Locomotive Co., Ltd., Zhuzhou 412001 China
  • Received:2019-09-12 Online:2019-12-25 Published:2020-03-18

Abstract:

Item 6 of IEC60076-1 and item 7 of GB1094.1-2013/XG1-2018 stipulate that the phase shift of clock ordinal number is used in the connection group, and the analysis is carried out by changing the combination mode of phasor diagram arrangement and rotating the line and phase voltage phasor of Δabc . This method cannot simplify the analysis process, reduce the analysis difficulty and improve the analysis effect. According to the law of phasor analysis of connection group,the following views are presented. The connection group is marked by clock ordinal mark shift, and the phasor diagram arrangement and combination mode remains unchanged, instead of rotating Δabc, but by moving lead-out wire mark minute hand UA ( or hour hand Ua ) of A( or a ) phase for analysis. Compared with the current connection group phasor analysis method at home and abroad, this analysis method greatly simplifies the analysis process, reduces the analysis difficulty and improves the analysis effect. According to the law of the phasor analysis of the coupling group, the international standard stipulates that the phase shift of the coupling group is marked by the clock ordinal number. It can be seen in the clock ordinal number label phase shift method that the line phase voltage phasor Δabc and a phase lead line mark Ua rotate at the same time is phase shift, if Δabc does not rotate, but move a phase lead line mark Ua, it becomes the same sign shift answer.

Key words: Transformer, connection group, phasor analysis, phase shift, mark shift

CLC Number: