On-Line Evaluation of Voltage Transformer Accuracy

Abstract:

The accuracy of voltage and current transformer (VT and CT) is a key factor in electric power metering. Ratio error and phase displacement calibration of VT and CT is traditionally carried out off-line. As a result of the expansion of the power grid and the increasing metering quality requirements from customer side, the off-line metering of VT and CT becomes more and more difficult. In this paper, a VT accuracy on-line evaluation system is developed, which can evaluate the accuracy of VT under on-line operating status. The principle and adopted key techniques in the development of the VT accuracy on-line evaluation system is introduced. Some on-site test results are also presented and analyzed as application demonstration.

• Periodical: Advanced Materials Research (Volumes 433-440)
• Pages: 6071-6076
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.433-440.6071
• Online since: January 2012
• Authors: Xiao Hui Yang, Dong Yan, Kai Xie, Yong Wang
• Keywords: Accuracy Evaluation, Live Line Work, Standard Capacitor, Voltage Transformer

References

[1] China mechanical industry standard, JJG1021, Instrument Transformers in Power System, (2007).

[2] E. Anderson, J. Karolak, J. Wroblewski, A. Hyrczak, A. Ratajczak, R. Zajac, Metrological Properties of High Voltage Instrument Transformers after Many Years' Service, CIGRE session 2004, Paper A3-1 13.

[3] China mechanical industry standard, JJG169, Instrument Transformet Test Set, (1993).

[4] China mechanical industry standard, JB/T 1811, Standard Capacitor filled with Compressed Gas, (1992).