聚合物绝缘充气高压电器内部屏蔽系统的优化

L. Zhorniak, A. Afanasiev, Vitaliy Schus
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摘要

本文提出了一种计算轴对称充气高压装置固体绝缘结构电场强度分布的电负荷参数估计方法。本设计是一个以SF6气体作为内部绝缘介质填充的支架和绝缘盖。这种技术使得根据设备的设计特点和用于平衡电场的屏蔽系统来估计电负载的参数(电压和场强)成为可能。提出的方法使得在设计和改进单个设计方案时,能够评估充气高压设备(仪表变压器、避雷器、浪涌抑制器等)屏蔽系统设计参数影响的有效性。在考虑了实际运行情况和外界因素影响的情况下,计算结果与实验研究数据和绝缘结构运行监测所得的统计信息吻合较好。该技术的实施使得考虑外部因素的影响和仪表变压器和避雷器固有的工作特性成为可能。在所提出的方法中,以一个支撑绝缘罩为例,它在最不利的条件下运行,如外部污染、湿气及其组合、各种来源的过电压等。以TOG-245系列充气电流互感器的量产设计为例进行了计算,验证了理论结论。通过对特定的绝缘结构进行一系列的计算和实验测试,可以更准确地确定所提出的方法在预测屏蔽系统作用下场强分布参数方面的有效性。由此得出结论,所得结果可用于评价充气仪表变压器和类似高压开关设备及变电站的外绝缘性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Optimization of the internal shielding system in gas filled high voltage electric appliances with polymer insulation
In the article, the authors propose a technique for estimating the parameters of the electrical load for calculating the distribution of the electric field strength of a solid insulating structure of gas-filled high-voltage apparatus that have axial symmetry. This design is a support and insulating cover filled with SF6 gas as an internal insulating medium. This technique makes it possible to estimate the parameters of the electrical load (voltage and field strength) depending on the design features of the device and the shielding system that is used to equalize the electric field. The proposed method makes it possible to evaluate the effectiveness of the influence of the design parameters of the shielding system for gas-filled high-voltage equipment (instrument transformers, arresters, surge suppressors, etc.) when designing and improving individual design solutions. The calculation results are in good agreement with the data of experimental studies and statistical information obtained as a result of monitoring the operation of insulating structures, taking into account real operating conditions and the impact of external factors. The implementation of this technique makes it possible to take into account the influence of external factors and operational characteristics inherent in instrument transformers and surge arresters. In the proposed method, as an example, a supporting insulating cover is considered, which is during operation in the most unfavorable conditions, such as external pollution, moisture and their combination, overvoltage of various origins, etc. Theoretical conclusions are confirmed by the results of calculations on the example of the most mass-produced design of a gas-filled current transformer TOG-245 series. A more accurate determination of the effectiveness of the proposed method for predicting the parameters of the distribution of the field strength under the action of the shielding system can be achieved by carrying out an additional series of calculations and experimental tests of specific insulating structures. Thus, it was concluded that the obtained results can be used to assess the external insulation performance of both gas-filled instrument transformers and similar high-voltage switchgear equipment and transformer substations.
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