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Protection of cross-bonded cable systems using non-linear inductive device

Protection of cross-bonded cable systems using non-linear inductive device
Protection of cross-bonded cable systems using non-linear inductive device

The adoption of cross-bonding in single-cored cable systems virtually eliminates sheath power losses (with their heating effects). Nonetheless, cross-bonding is associated with high over-voltages across sheath interrupts. These over-voltages are due to the reflection of travelling wave from the cross-bonded points. Protection of sheath interrupts is accomplished in practice by using ZnO non-linear resistors. The present work proposes non-linear inductive device as an alternative to the ZnO resistor. The performance of this device, when connected to the sheath circuit of a single-phase cable system, is tested experimentally under steady-state and impulse current transient conditions. Computational results are shown to conform to the experimental ones. This indicates that the mathematical models used, for both the cable and the protective device, provide a reasonable presentation of the system. A mathematical model of a single major section of cross-bonded cable system is developed, and an outline of the Z-transform method for determining transient over-voltages in the system is presented. Cross-bonded cables are analyzed in terms of the parameters of constituent homogeneous sections. These parameters are compounded by using a rotation matrix at each cross-bonding point. Sheath voltages to ground and voltages across sheath interrupts are calculated at various points along typical system comprising one major section. Finally, the effect of the non-linear device on the prospective sheath over-voltages, under different switching conditions, is investigated.

University of Southampton
Abdul Ghani, Mohamad Mahmoud
Abdul Ghani, Mohamad Mahmoud

Abdul Ghani, Mohamad Mahmoud (1991) Protection of cross-bonded cable systems using non-linear inductive device. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

The adoption of cross-bonding in single-cored cable systems virtually eliminates sheath power losses (with their heating effects). Nonetheless, cross-bonding is associated with high over-voltages across sheath interrupts. These over-voltages are due to the reflection of travelling wave from the cross-bonded points. Protection of sheath interrupts is accomplished in practice by using ZnO non-linear resistors. The present work proposes non-linear inductive device as an alternative to the ZnO resistor. The performance of this device, when connected to the sheath circuit of a single-phase cable system, is tested experimentally under steady-state and impulse current transient conditions. Computational results are shown to conform to the experimental ones. This indicates that the mathematical models used, for both the cable and the protective device, provide a reasonable presentation of the system. A mathematical model of a single major section of cross-bonded cable system is developed, and an outline of the Z-transform method for determining transient over-voltages in the system is presented. Cross-bonded cables are analyzed in terms of the parameters of constituent homogeneous sections. These parameters are compounded by using a rotation matrix at each cross-bonding point. Sheath voltages to ground and voltages across sheath interrupts are calculated at various points along typical system comprising one major section. Finally, the effect of the non-linear device on the prospective sheath over-voltages, under different switching conditions, is investigated.

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Published date: 1991

Identifiers

Local EPrints ID: 459338
URI: http://eprints.soton.ac.uk/id/eprint/459338
PURE UUID: a254f2be-19fa-4901-b999-5140906afd48

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Date deposited: 04 Jul 2022 17:08
Last modified: 04 Jul 2022 17:08

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Contributors

Author: Mohamad Mahmoud Abdul Ghani

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