Influence on voltage distribution of composite insulator by inserting metal electrodes in weather sheds

Abstract

The uneven distribution of voltage along the composite insulator strings harmed their electrical and mechanical properties heavily, which threatened the safety of power system. Inserting metal electrodes in the silicone rubber sheds of composite insulator helps increase their self-capacitance, thereby ameliorating the voltage distribution along the string. In this paper, a new structure of weather sheds with metal electrodes inserted has been designed. Tests on composite insulators with different metal electrodes setup were conducted to examine their voltage distribution performance. Corona inception voltage of the mentioned composite insulators was obtained by a remote monitoring system as a criterion of the voltage distribution performance. Simulation model of the insulators were set up and calculation of their voltage and electric field distribution were carried out by finite element method (FEM). The calculation result was in good compliance with the experiment result. The applied voltage at the live end of composite insulator decreased by 4% when inserting electrodes in the weather sheds, which was verified by both experiment and simulation results.

Non-contact voltage measurement of residential cables based on internal parameter conversion and centering probe assistance

“…The preliminary probe model and parameters are shown in figure 4. The simulated wire is a typical three core cable 60227IEC53 [28], and the voltage of live wire is set at 220 V. Since the spring in the telescopic pins are made of metal material, the distorted electric field generated by it will change the spatial electric field distribution and affect the induced voltage [29]. The insertion of wires of different wire diameters will lead to different telescopic lengths of the spring, resulting in different degrees of electric field distortion, as shown in figure 5.…”

Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method

“…As stated above, due to the effect of stray capacitance, the VDR of the test CVD exceeded the requirement of class 0.2 even adjusting the position of the medium-voltage tap. Some studies indicate that the metal shield and grading ring can compensate for the effect of stray capacitance, improve the distribution of electric field, and boost the voltage endurance and insulation strength of the high-voltage apparatus accordingly [14,15,39]. In this section, we analyze the effect of the shield on the VDR of the test CVD and optimize the structure parameters of the shield to reduce VDR further.…”

“…e electric stress on the insulator close to the power line is obviously higher than that close to the tower. A grading ring [14] and metal electrodes [15] can homogenize the voltage distribution effectively. e stray capacitance can also affect the voltage distribution of breaks for the multibreak vacuum circuit breaker [16,17].…”

Influence of Electric Field Distribution on 33kv Non-Ceramic Insulator with Different Shed Configurations using 3D Finite Element Method

“…The potential distribution along the end fittings are a large amount high stress when compared to the center portion of an insulators. This is mainly due to the lower value of self-capacitance: calculation of the voltage distribution along a 34.5 kV composite insulator stated that 70% of the input supply was intense on 22% of the insulation distance gap [7,8]. Survey result indicates that electric field distribution along the whole insulator sheds appears to be a "U" style distribution [9,10].Many researchers proposed various stress controlled techniques to make the forms of E-field and potential distributions as uniform.…”