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Sheath current for a proper cross bonded cable is not zero, even in the balanced condition, how to achieve zero sheath current for a cable?

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In a proper cross bonded cable, in every minor section the seath current should ideally be zero as (Va+Vb+Vc=0). In simulink using the cable model the sheath current is not coming zero, Please explain the reason or how to acieve zero seath current.

Answers (1)

Anshuman on 14 Mar 2024
Hi Arittra,
The cross-bonding arrangement connects the cable sheaths in a manner that ideally cancels out the induced voltages in each section of the cable sheath, leading to a theoretical zero sheath current in each minor section when the system is perfectly balanced ((V_a + V_b + V_c = 0)).
However, achieving zero sheath current in simulations (like in Simulink) or in real-world applications can be challenging due to several factors such as cable system imbalances, ground potential difference along the cable, model accuracy and parameter selection.
To minimize sheath current in a cross-bonded cable system, both in simulations and in practice, consider the following approaches:
  • Ensure that the cable model accurately reflects the physical characteristics of the cable system. Use detailed and accurate parameters for the cables, including their mutual inductances and capacitances.
  • Aim to balance the load as much as possible across the three phases. While perfect balance might not be achievable, minimizing the imbalance will help.
  • Ensure that the model includes all relevant inductances and capacitances, including those between the cables and the ground.
Hope this helps!

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