UNDERGROUND SYSTEM REA.pptx - UNDERGROUND SYSTEM UNDERGROUND CABLES Cables are installed either on overhead or underground lines The handling of cables

UNDERGROUND SYSTEM REA.pptx - UNDERGROUND SYSTEM...

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UNDERGROUND SYSTEM
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UNDERGROUND CABLES.Cables are installed either on overhead or underground lines .The handling of cables require a lot of care to ensure the cores are not damaged .When the cable is hit and not noted ,that point becomes a weak point due to damage to insulation. The heating effect at the weak point may with time break and cause interruption of supply.Digging along the cable route is a major cause of cable break-downs.Overloads on cables causes over heating resulting to damage on insulation thereby causing short circuit on phases.
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UNDERGROUND SYSTEM.OD / VL UNITS.OD is a switch immersed in oil and is commonly used on the underground system.The handle is designed with mechanical locking that ensure the grip to open or close.The switch has a tag that show when it is on or off position.The oil is changed after a number of operations to ensure dielectric strength is retained.
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  • Spring '18
  • Professor Obura Oluoch
  • Causality, switch, Short circuit, Circuit breaker, Cables

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