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One numerical method to determine improved cable terminations

机译：一种确定改进的电缆端接的数值方法

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摘要

In HV and MV systems, cable terminations (CT) are one of the weakest links. The majority of cable failures on distribution system are caused by defects in cable terminations and cable joints. There is a number of CT developed in last few years, but cable failures still happen, causing great economic losses, mainly because of a CT breakdown. For that reason any improvement in the cable termination construction is of interest. Two different approaches have been proposed to evaluate a field distribution. Geometrical control of the electric field, applying multilayer dielectric deflectors with different permittivities, as well as application of the grounded embedded electrodes for strong electric field reduction at the cable ends, is presented in this paper.One numerical method, the equivalent electrodes method (EEM), has been applied for electric field calculation at the modelled cable terminations. The accuracy of results of the EEM depends on the number of used equivalent electrodes (EE). The method is very simple and exact and in limit process with the number of EE gives exact results. Improvement proposed in this paper enables accurate calculation using small number of EE. Some results obtained by the application of the EEM have been compared with values obtained using the finite elements method and a very good matches have been identified.
机译：在高压和中压系统中，电缆终端（CT）是最薄弱的环节之一。配电系统上的大多数电缆故障是由电缆端子和电缆接头的缺陷引起的。最近几年开发了许多CT，但是电缆故障仍然会发生，造成巨大的经济损失，这主要是因为CT击穿。因此，电缆终端结构的任何改进都值得关注。已经提出了两种不同的方法来评估场分布。本文介绍了电场的几何控制，应用具有不同介电常数的多层介质偏转器以及在接地端施加接地电极以减小电缆末端的强电场的方法。一种数值方法，等效电极法（EEM） ）已用于建模电缆终端处的电场计算。 EEM结果的准确性取决于所用等效电极（EE）的数量。该方法非常简单和精确，并且在有限的过程中，随着EE数量的增加，结果是精确的。本文提出的改进措施可以使用少量EE进行精确计算。通过应用EEM获得的一些结果已经与使用有限元方法获得的值进行了比较，并且已经找到了很好的匹配项。

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