Articles: High Voltage Cable Design

Emergency and Cyclic Ratings of HV Cables

The definition of emergency rating is the permissible short-term rating of a cable already loaded and at a steady-state, considering the thermal capacitances and the thermal resistances of an installed cable system. The definition of cyclic rating is the maximum current of a cable when the load is varied in a sequence of steps that are repeated cyclically. The cyclic rating differs for different sequences and different cycle periods. Both emergency and cyclic ratings deal with time-varying loads

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Magnetic Fields from High Voltage Power Cables

This paper analyses the magnetic fields, in the context of a health and safety-related issue, produced by electrical power cables installed in various configurations under varying conditions. A specialist calculation module in-built to ELEK Cable High Voltage software has been used for calculating the results based on the Biot-Savart law.

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Factors Affecting Bare Conductor Current Ratings

The current rating of bare conductors is affected by the conductor temperature, weather parameters, heat losses due to convection and radiation, the solar heat gain and conductor resistance, the calculation of which is governed by a steady-state and a non-steady-state heat balance equation.

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High Voltage Power Cable Current Ratings

Power cables are used for both ac and dc high voltage power transmission throughout the world. Technological advances, particularly those relating to jointing, has meant that cables can reliably be utilised at ever-increasing voltages and for a broader range of applications and installation conditions than ever before.

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Submarine Power Cable Ratings

The calculation of current ratings for modern submarine cables is similar to that of land cables, with only a few nuances. Some important differences which affect the current rating lie in the areas the cables construction and installation conditions.

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