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Capacitively Coupled Cables for Transmission and Distribution of Electrical Power

Ongoing

Project description

Summary

This project is aiming at the design of a new type of power cable with decreased power loss and reduced line voltage drop by balancing the line reactance.

Project description

The impact of energy dissipation on environment in the twenty first century is both a challenge and an opportunity for a variety of technologies and operating scenarios in power Transmission and Distribution (T&D) networks. In 2014, the global electricity T&D network losses were about 8.6% of the total electricity production (23,844TWh). The need to provide low line losses and reliability will create a very favourable climate for the entry of low loss power cables and innovative operating practices.

This project is aiming at the design of a new type of power cable that is called Capacitive Transmission System (CTS) cable with decreased power loss and reduced line voltage drop by balancing the line reactance.

The CTS cable prototypes are designed and modified under the assistance of COMSOL that provides the multi-physics simulations including electric, magnetic and thermal finite element analysis (FEA).

The designed CTS cables will be manufactured by different cable manufacturers with necessary test to determine the practical performance and to improve the design of CTS cables.

Meanwhile, the practical testing results and the FEA simulation results will be considered for circuit modelling for systematic simulation in Dig-SILENT and MATLAB to simulate the systematic performance of CTS cables.

All theory analysis, FEA simulation, laboratory tests and systematic simulation will be summarised for the application of CTS Intellectual property (IP) and journal paper publication.

Project Duration

1st October 2017 to 31st March 2019

Impact statement

  1. Contribute no reactive power - Capacitive Transmission System (CTS) cable works as a combination of a capacitor and a transmission line in normal operating conditions, which provides the feasibility to offset the inductive reactance of wires by capacitive energy transfer between wires. Consequently, unlike any existing cables, CTS can be designed to contribute low or no reactive power to electric networks.

  2. Reduce skin effect - CTS cable works as input and output wires to transmit power. The dielectric between input and output wires limits the paths for eddy current (e.g., the reason of skin effect, that makes the current density redistribution in conductors under AC excitation). Therefore, the effective conductive area of CTS cable is increased with smaller AC resistance in wires.

  3. Reduce voltage drop - Voltage drop in conventional cables is mainly the result of the impedance in core conductors. CTS cable provides the feasibility to offset the inductive reactance of wires and to reduce the skin effect to decrease the wire resistance. Consequently, the voltage drop of CTS cable is less than that of conventional cables when delivering the same load current.

  4. Improve system performance - From systematic view, CTS improves the load current and power quality, delivering more power to a local delivery point, so other lines connected to this point will benefit with a lesser power transfer requirement, resulting in less energy loss overall.