Abstract
This paper reports on a method combining the use of finite element simulations and external measurements to provide preliminary condition diagnosis of oil-filled cable sealing ends (CSEs) without requiring downtime. Good agreement has been obtained between the predictions from the electric field and thermal simulations and the measurements on a 132 kV oil-filled CSE. The electrostatic computation combined with electric field measurements can provide information regarding the electric field distribution inside the CSE and help in identifying potential issues with the CSE design, the materials or the cable termination process. The thermal computation combined with thermal imaging can reveal potential problems, such as high resistance connection to the busbar, and provide information regarding the cooling efficiency of the liquid dielectric. The method presented can provide the starting point for prioritizing maintenance operations on CSEs.
Highlights
C ABLE systems have a wide range of potential degradation modes
This paper presents a simulation methodology which can be used to examine the electric field distribution and the thermal performance oil-filled cable sealing ends (CSEs), using a 132 kV oil-filled CSE as an example
A high fidelity, three-dimensional (3D) model of the 132 kV CSE was reconstructed in a Computer Aided Design (CAD) software package using the original mechanical drawings which date back to 1985
Summary
C ABLE systems have a wide range of potential degradation modes. Failures can occur due to poor quality or ageing of the insulation or accessories [1], [2]. Cable accessories, such as cable terminations and joints, have a significant impact to the reliability of transmission systems mainly to the longer repair time of cable connections when compared to overhead lines [7], [8]. The modes leading to failure of the CSEs are still under investigation Cable accessories, such as CSEs, are potential hot spots in cable circuits temperature related effects are likely to be involved [13], [14]. To formulate a holistic view, examination of the components and materials inside the CSE housing is required This can be problematic since appropriate instrumentation including internal sensors is usually not preinstalled, and the CSEs are usually designed as ‘seal-for-life’ units. The aim was to investigate whether external instrumentation combined with the simulation results can be used to diagnose the condition of a CSE without downtime
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