The Study On Accuracy Of Field Calibration Method And Equipment Of 750kV Transformer

Background of this paper is based on continuous development and construction of Ningxia supergrid, the number of 750kV substation and booster station growing, increasing the grid 750kV transfonner substation Ningxia acceptance of quality work and post weekly inspection workload, the 750kV transformers need to work on-site measurement error, thus ensuring accurate measurement 750kV substation 750kV transformers, safe and reliable. Effectively remove the influence due to errors caused by unqualified and for energy metering to ensure the accuracy of the power grid and power plants, among provincial electricity grid accuracy and fairness of the settlement and line loss calculation. Due to the high level of 750kV EHV grid voltage, the country is still a lack of appropriate transformer calibration equipment and methods. If 750kV transformer metering accuracy can not be met, it will seriously affect power grids and power plants, the accuracy of the inter-provincial electricity grid settlement of accuracy, fairness and line loss calculation, to the parties concerned to bring serious economic losses.Therefore, this article by conventional transformers and 750kV high-voltage transformer site calibration method and apparatus for comparison. Theoretical study of the use of existing equipment and field trials, the use of capacitive compensation upflow 750kV CT method for verification, reducing test power supply and regulator capacity requirements, the first in China to achieve a 800kV circuit breaker current transformer tank spot check; the use of existing high voltage dielectric loss of the bridge and inductive voltage divider, the first created by high-pressure and high-pressure standard capacitor dielectric loss of the bridge scene unfold experimental validation type 750kV voltage transformer sets in our standard equipment, by Indirect comparison of its error checking. Meanwhile, the paper on various factors transformer error is analyzed, and all kinds of methods and check the stability of the capacitor voltage transformer primary standard voltage capacitors were studied and analyzed. According to the current application, the conclusions of this paper is applicable to all 750kV voltage level or lower than its transformer-site verification experiments can also be upgraded to 1000 kV UHV transformer and GIS in the transformer on-site verification experiments. I hope that through this research applications, to enhance the site is accurate and reliable measurement of 750kV transformer, thus eliminating the effects due to errors caused by unqualified and for energy metering, ensuring grid and power plants, among inter-provincial power grid, and the accuracy and fairness of the settlement of tariff lines The accuracy of the calculated loss.