Nonintrusive Voltage Measurement Method for Power Overhead Lines

Abstract

The development of smart and efficient power grid is an inevitable trend in the future <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</sup> . Smart grid needs a flexible, stable and secure energy network, but also needs real-time measurement and dynamic adjustment of power grid state quantities, so as to realize smart sense of information and intelligent self-healing of faults in power grid <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[2]</sup> . Voltage is one of the most important state quantities in power grid. At present, potential transformers commonly used in power grid have many disadvantages, such as large volume, heavy weight, high cost and single function, which make it difficult to meet the requirements of digitalization, miniaturization, and low cost for sensors in smart grid <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[3]</sup> . In recent years, new voltage measurement technologies and electric field sense materials have developed rapidly. There are plenty of researches on electric field sense chip based on piezoelectric material, which is suitable for voltage measurement in smart grid <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[4]</sup> . A voltage measurement method for overhead line based on electric field sense chip is proposed in this paper. The voltage value can be calculated without any contact with the overhead line by applying this method, which requires no high voltage insulation, and no magnetic core and coil neither. This method lays a theoretical foundation for the development of micro smart voltage sensor. Simulation models of two different scenes were established and analyzed to verify the accuracy and efficiency of the proposed method.