Decomposition of Composite Electric Field in a Three-Phase D-Dot Voltage Transducer Measuring System

Abstract

In line with the wider application of non-contact voltage transducers in the engineering field, transducers are required to have better performance for different measuring environments. In the present study, the D-dot voltage transducer is further improved based on previous research in order to meet the requirements for long-distance measurement of electric transmission lines. When measuring three-phase electric transmission lines, problems such as synchronous data collection and composite electric field need to be resolved. A decomposition method is proposed with respect to the superimposed electric field generated between neighboring phases. The charge simulation method is utilized to deduce the decomposition equation of the composite electric field and the validity of the proposed method is verified by simulation calculation software. With the deduced equation as the algorithm foundation, this paper improves hardware circuits, establishes a measuring system and constructs an experimental platform for examination. Under experimental conditions, a 10 kV electric transmission line was tested for steady-state errors, and the measuring results of the transducer and the high-voltage detection head were compared. Ansoft Maxwell Stimulation Software was adopted to obtain the electric field intensity in different positions under transmission lines; its values and the measuring values of the transducer were also compared. Experimental results show that the three-phase transducer is characterized by a relatively good synchronization for data measurement, measuring results with high precision, and an error ratio within a prescribed limit. Therefore, the proposed three-phase transducer can be broadly applied and popularized in the engineering field.

Simulation, Design, and Test of a Dual-Differential D-Dot Overvoltage Sensor Based on the Field-Circuit Coupling Method

“…I is a metal electrode of any shape with an external surface of A. II is a metal insulator with metal electrode mounted on it. The metal electrode is connected with the grounded equivalent measuring resistance R m through coaxial cable [19,20]. The relationship between the single electrode output U o ( t ) and the measured wire potential U i ( t ) can be deduced from the Gauss theorem [21].…”

Simulation and Test of a Contactless Voltage Measurement Method for Overhead Lines Based on Reconstruction of Integral Node Parameters

“…Some scholars focus on the design method and the structure optimization of D-dot E-field sensors. Hu Xueqi et al [17] designed a vertically placed D-dot sensor and proposed a decoupling method for the superimposed E-field. Fan, YY [18] presented an efficient D-dot sensor design method based on a field-circuit coupling design method.…”

Contactless voltage sensor for overhead transmission lines

“…Wu et al in [17] proposed three methods to calibrate the coupling matrix: (i) introducing an assistance of switching transient events, (ii) designing a symmetrical structure between the overhead line and sensors, and (iii) adopting the reference voltages. In [18,19], the coupling matrix is calibrated based on the system voltages and sensor signals. These methods [17][18][19] are usually implemented in substations, and their measurement accuracy is high.…”

“…In [18,19], the coupling matrix is calibrated based on the system voltages and sensor signals. These methods [17][18][19] are usually implemented in substations, and their measurement accuracy is high. However, these methods technologies are not suitable for overhead lines.…”

“…Table 1 summarises a comparison between the existing methods and the proposed method. Even though these studies in [14,15,[17][18][19][20] show high sensing accuracy, It will be even harder to implement them into the field measurement because of the calibration procedure. Compared with the method in [23], our method using only three sensors, which is more suitable for the actual field measurement.…”