Abstract
Cable termination fault is one of the most important problems for high voltage underground cable lines (HVUCL). Harmonic current (HC) and the sheath current (SC) are causes of cable termination faults of HVUCL. The sheath voltage (SV) of cable increases due to SC and HC also. So, the electroshock risk for human occurs. In this study, cable termination faults are examined for long HVUCL that is connected to electric network with high harmonic distortion rate. In literature, solid bonding (SB) and sectional solid bonding (SSB) methods are used to reduce harmonic distortion rate and SC effect in HVUCL. However, when SB and SSB methods are used for bonding of long HVUCL, harmonic distortion limit and touch voltage limit are exceeded. Therefore, the modified SSB (MSSB) method is developed for bonding of long HVUCL. SV of HVUCL should be known to use MSSB for bonding of long HVUCL. Then SV of HVUCL is forecasted by using artificial neural network and hybrid artificial neural networks (HANN) before the long HVUCL is installed. MSSB parameters should be optimized, so that optimization methods are used for optimization of MSSB and HANN. When MSSB method is used for bonding of long HVUCL, harmonic distortion limit and touch voltage limit are not exceeded under high harmonic distortion conditions.
Highlights
High voltage underground cables (HVUC) are used in city centre or crowded areas because safety of the HVUC is better than of overhead lines
The simulation results of these High voltage underground cable line (HVUCL) are used for training and forecasting studies of artificial neural network (ANN) and hybrid artificial neural networks (HANN)
The modified SSB (MSSB) method is improved for bonding of long HVUCL to avoid cable faults, which is connected to the electric network with high harmonic distortion rate
Summary
High voltage underground cables (HVUC) are used in city centre or crowded areas because safety of the HVUC is better than of overhead lines. High voltage underground cable line (HVUCL) is used in submarine link [1]. Connection between HVUC and high voltage equipment is is made by using cable terminations. Electrical stress, increased voltage and thermal effects are the aging causes of insulation of HVUC [3], [4]. Cable termination voltage increases due to capacitive load current, proximity effect, high frequency, voltage transient, and parallel resonance [5]. Cable temperature increases due to overloading, harmonic current (HC), sheath current (SC), and environmental conditions [6]
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