Medium Voltage Cable Shield Grounding

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Medium voltage cable shield grounding.

Why do high voltage cables have shields. General cable is recognized as a world class leader in the development and design of medium voltage industrial cables. Medium voltage cable shielding and grounding abstract. Verification of shield performance under ground fault conditions will prevent systemwide cable damage as we all know the metallic shielding in a medium voltage mv cable provides the necessary uniform electric field within the cable s insulation.

That of carrying a portion of return ground fault current. Shield losses shield grounding and shield terminations are also discussed. What is not as well known is its other equally important function. Tape shielded drain wire shielded general cable unishield concentric neutral cn jacketed concentric neutral jcn beyond cable shield types two common configurations are used.

The authors describe the purposes of the shields conductor shield insulation shield and metal shield in medium voltage cables. Single conductor. Shielding of electric power cable results in symmetric electric field distribution within the cable insulation and prevents stress damage. If an unshielded insulated cable is in contact with earth or a grounded object the electrostatic field around the conductor will be concentrated at the contact point resulting in corona discharge.

Medium high voltage cable types of the nearly limitless variety of cables in use today five of the most common are. From an engineering standpoint there are several factors one needs to consider before installing the cable. Medium and high voltage power cables in circuits over 2000 volts usually have a shield layer of copper or aluminum tape or conducting polymer. Grounding methods and requirements for systems operating at more than 1 000 volts v such as 5 and 15 kilovolt kv systems differ slightly from those for systems of 1 000v or less.

It is noted that in essence the conductor shield is an electrical extension of. Systems in these voltage ranges are commonly referred to as medium voltage systems. The nec provides several rules related to the grounding of these systems and associated equipment.