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‣  What can be the causes of damage to PVC cables and paper insulated cables?‣  What precaution should be taken while taken a cable through trenches in the following locations (a) Road crossing, (b) Railway crossing & (c) Crossing of water mains ?‣  What is called “Barrier joint” of cable ?‣  What is called “Heat shrinkable joint” of cable?‣  What are the procedures to be adopted for determining the types of cable faults ?‣  What is proximity effect ?‣  What is soil thermal resistivity ?‣  What are the methods of cable laying ?‣  what special cares are to be taken for storage of cable drum ?‣  What are the load conditions of an underground cable ?‣  What do you mean by thermal resistance of a single core cable ?‣  What do you mean by the term “Dielectric losses” ?‣  What is the procedure of reducing the sheath losses in sheaths of the three single core cables in a 3-phase system ?‣  What do you mean by the term “Sheath losses” ?‣  What do you mean by MIND cable and where is it used ?‣  What do you mean by XLPE cable and what are its advantages over conventional cables ?‣  What are varnished cambric insulated cables ?‣  Interview Question of Underground Cable

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What do you mean by MIND cable and where is it used ?

MIND cable means Mass Impregnated Non-Draining type cable. In paper insulated cable the impregnating oil compound has a tendency to drain or migrate when laid on step slopes. Such migration of impregnating compound makes the paper insulation dry at the upper portion which creates voids and initiates ionization. Moreover accumulated compound at the lower portion creates pressure on the metal sheath and may cause its damage. To overcome this difficulty, the paper insulated cables are impregnated with a non-draining resin base compound containing petroleum jelly or microcrystalline waxes. These MIND cables are available for all voltages up to and including 33 kV. These cables are suitable for vertical run particularly on hills or in mines.

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