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首页> 外文会议>International Middle East Power Systems Conference >Dynamic derating of three-phase underground power cable under current harmonic distortion
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Dynamic derating of three-phase underground power cable under current harmonic distortion

机译：电流谐波畸变下的三相地下电力电缆的动态降额

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摘要

Underground power cables have significant importance of transmitting and distributing power in the electrical power systems. The thermal analysis of such cables has a major interest due to the continuous stresses of their constructive materials as a result of current application. It is well recognized that the current carrying capacity (ampacity) of the cable is a robust function of the thermal distribution inside the different constructive parts of the cable due to conductor current injection. Current harmonics will give rise to increase the temperature of the conductors inside the cable which may exceed its maximum permissible value. Consequently a derating process should be initiated in order to meet the maximum allowable conductor temperature and hence conserve the insulation lifetime. This paper proposes a dynamic derating process of the cable as a result of current harmonic distortion through a transient thermal network modeling of three-phase underground cable. Prony analysis-Hilbert transform approach is used to extract the magnitudes, frequencies and phase angles of the distorted current signal. Therefore, this coupling between transient modeling and harmonic extraction approach can be used as online condition monitoring and derating of cable ampacity due to any harmonic distortion of the current signal.
机译：地下电力电缆在电力系统中传输和分配电力非常重要。这种电缆的热分析引起了人们的极大兴趣，这是由于当前应用导致其结构材料不断受到应力的影响。众所周知，由于导体电流的注入，电缆的载流量（安培）是电缆不同结构部分内部热分布的强函数。电流谐波将导致电缆内部导体的温度升高，该温度可能超过其最大允许值。因此，应启动降额过程以满足最大允许导体温度，从而延长绝缘寿命。本文通过三相地下电缆的瞬态热网络建模，提出了一种由于电流谐波失真而导致的电缆动态降额过程。 Prony分析-希尔伯特变换方法用于提取失真电流信号的幅度，频率和相角。因此，由于电流信号的任何谐波失真，瞬态建模和谐波提取方法之间的这种耦合可以用作在线状态监测和电缆载流量的降额。

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