The Studies On The Novel Method Of PT Secondary Circuit Voltage Drop Compensation

The error of energy measurement caused by PT secondary circuit voltage drop is a special part of the energy measurement composite error. The maximum value could be reach 6% that the energy measurement error caused by the PT secondary circuit voltage drop. It is very surprise that the lost electricity charge caused by it according to some relative statistic. To select this problem to study and present some relative solutions, thus make it converting to some practicality productions and enhance the energy measurement accuracy, these must have important meanings for both the electricity generator and electricity user. Firstly the reasons of the voltage drop in existence and the PT secondary circuit's features are analyzed. The affect of the voltage drop to energy measurement, the several methods for reduce the voltage drop and each characteristic is summarized. By adequately collecting the relative literature and information, the researched fruit in theory and the experience of practicality application is summarized and establish the main task of the dissertation. In this paper the all kinds of method for the on site measurement and test of the PT secondary circuit voltage drop. Some new ameliorated schemes are presented to the secondary circuit voltage drop compensation device in being. Not only improving the compensation feature of the device, but also lesser in size, more suitable for the energy meter box because of the good-looking shape. For the compensation device existing must need the voltage signal line, a kind of distributed compensation system are presented. The voltage signal line was canceled in the new scheme and the voltage signal was sent by communication. The security and reliability of the new made compensation device are studied technically, a new scheme of current and voltage protection for the electronic circuit of the compensation device are set to forth. The new made PT secondary circuit voltage drop compensation device is tested and preliminary operation at the laboratory and the substation. The performance is proved well. The data is analyzed.