Electronic Voltage Transformer Based on TA
Liu Yue-qun · Yibiao jishu yu chuanganqi · 2010
As for a variety of voltage transformer technical problems emerging in recent years,a new electronic voltage transformer method was presented by detecting micro-current in coupling capacitor.The new type EVT used the current transformer to detect the coupling capacitor's current,and then secondary low current of the current transformer was led into processing equipment in a control room by transmission lines.The secondary voltage signal,which followed proportionally the primary high voltage,was converted from the secondary low current by the processing equipment.The new type high-voltage EVT's principle and structure were analyzed in detail.Based on this,general voltage transformers were compared with it.Then high voltage tests on the high-voltage EVT were conducted.Theoretical research and experiment results show that the EVT is light and small with simple structure,without oil-tank,good at electric insulation,with high measurement accuracy,stable and reliable working ability,and strong anti-electromagnetic interference ability,which has great prospects for the popularization and application.