750kV互感器準(zhǔn)確度現(xiàn)場校驗方法與裝備研究
[Abstract]:The research background of this paper is based on the sustainable development and construction of Ningxia UHV power network, and the number of 750kV substations and booster stations is increasing, which increases the workload of quality acceptance and late weekly inspection of transformer projects in 750kV substations of Ningxia Power Grid. It is necessary to measure the field error of 750kV transformer to ensure the accuracy, safety and reliability of 750kV gate transformer in 750kV substation. In order to ensure the accuracy and fairness of electricity price settlement and the accuracy of line loss calculation between power grid and power plant and provincial power network the influence of non-qualified error on energy metering is effectively removed. Due to the high voltage grade of 750kV UHV power network, there is still a lack of corresponding equipment and methods for calibrating transformer in our country. If the accuracy of 750kV transformer can not be satisfied, it will seriously affect the accuracy, fairness and accuracy of line loss calculation between power grid, power plant and provincial power network, and bring serious economic losses to the relevant parties. Therefore, this paper compares the methods and equipment of conventional transformer and 750kV high voltage transformer calibration. The existing equipment is used to carry out theoretical research and field test, and the capacitive compensation up-current method is used to check the 750kV CT, which reduces the capacity requirements of the test power supply and voltage regulator, and realizes the field calibration of the current transformer in the 800kV tank circuit breaker first in our country. Using the existing high voltage dielectric loss bridge and inductive voltage divider, a complete set of standard equipment of field type 750kV voltage transformer is first established in our country, which is calibrated by high voltage standard capacitance and high voltage dielectric loss bridge. The error is checked by indirect comparison method. At the same time, all kinds of factors affecting the error of transformer are analyzed, and the methods of calibrating capacitive voltage transformer and the stability of main standard high voltage capacitance are studied and analyzed. According to the current application situation, the research conclusions in this paper are applicable to all 750kV or below its voltage level in the field calibration experiments, but also can be upgraded to 1000 kV UHV transformer and GIS in the field test of transformer calibration. It is hoped that through this research and application, the accuracy and reliability of the field 750kV transformer measurement will be enhanced, so as to eliminate the influence on the electric energy measurement caused by the unqualified error, and to ensure the power grid and power plant. The accuracy and fairness of interprovincial electricity settlement and the accuracy of line loss calculation.
【學(xué)位授予單位】:華北電力大學(xué)(北京)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TM45
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