Design, Experiments and Simulation of Voltage Transformers on the Basis of a Differential Input D-dot Sensor

Abstract

Currently available traditional electromagnetic voltage sensors fail to meet the measurement requirements of the smart grid, because of low accuracy in the static and dynamic ranges and the occurrence of ferromagnetic resonance attributed to overvoltage and output short circuit. This work develops a new non-contact high-bandwidth voltage measurement system for power equipment. This system aims at the miniaturization and non-contact measurement of the smart grid. After traditional D-dot voltage probe analysis, an improved method is proposed. For the sensor to work in a self-integrating pattern, the differential input pattern is adopted for circuit design, and grounding is removed. To prove the structure design, circuit component parameters, and insulation characteristics, Ansoft Maxwell software is used for the simulation. Moreover, the new probe was tested on a 10 kV high-voltage test platform for steady-state error and transient behavior. Experimental results ascertain that the root mean square values of measured voltage are precise and that the phase error is small. The D-dot voltage sensor not only meets the requirement of high accuracy but also exhibits satisfactory transient response. This sensor can meet the intelligence, miniaturization, and convenience requirements of the smart grid.

Research on Transmission Line Voltage Measurement Method of D-Dot Sensor Based on Gaussian Integral

“…Moreover, the metal structure is difficult to damage. Therefore, D-dot sensors can satisfy the development needs of the voltage transformers required by intelligent distribution networks in the future and can be widely used in the mature stage of technologies [ 1 , 2 ]. In traditional transmission line voltage measurement using D-dot sensors, the space electric field is measured firstly by the principle of electric field coupling.…”

Design and research of a three‐phase voltage sensor based on D‐dot principle

“…The D-dot sensor, which measures the electric displacement change to achieve the indirect voltage measurement, has some unique advantages over PT and CVT, such as good linearity and a large dynamic range [8][9][10][11][12]. With these good properties that fit the development needs of future power stations and substations, the D-dot sensor has become a popular object of study in academic circles both in China and abroad.…”

Design and Simulation Test of an Open D-Dot Voltage Sensor

“…Therefore, based on the traditional D-dot sensor, a differential input is adopted, the ground terminal is removed, and a multi-electrodes parallel structure is employed to increase the mutual capacitance. In this way, the D-dot sensor could maintain the self-integral pattern under small frequency [ 5 , 6 , 7 , 8 ].…”

“…The self-integral D-dot voltage sensor has a simpler structure, a smaller size and a higher measuring bandwidth [ 5 , 6 , 7 , 8 ]. However, it is inconvenient in practical installation due to the symmetric structure.…”

“…The traditional D-dot voltage sensor will adopt different operating modes under different frequencies [ 9 , 10 , 11 , 12 , 13 ]. To maintain the self-integral mode, a differential D-dot sensor is designed [ 5 , 6 , 7 , 8 ]. Its equivalent circuits are shown in Figure 1 .…”