What are the losses occur in an underground cable?
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What are the losses occur in an underground cable?
When two or more conductors of the same cable come in contact with each other, then this is called a short circuit fault. It is impossible to detect visually without taking the cable apart. A short-circuit fault occurs when the individual insulation of the cables is damaged. It can also be detected using a megger.
What causes power loss in cables?
The cause for power loss in a cable is resistance (R). Voltage(E) times current(I) is equal to power (P) (E x I=P). Also in a circuit voltage is equal to current times resistance( E=I x R). Thus, current squared, times resistance is equal to power.
How do you find a fault in an underground cable?
To find the location of cable fault using the thumping method, a thumper is set to thump repeatedly and then walking along the cable route to hear the thumping sound. The higher the dc voltage applied, the louder will be the resulting thump. This method is useful for relatively shorter cables.
What is the drawback of rubber insulation used in underground cable?
Although pure rubber has reasonably high insulating properties, it suffers form some major drawbacks viz., readily absorbs moisture, maximum safe temperature is low (about 38ºC), soft and liable to damage due to rough handling and ages when exposed to light.
How do you reduce cable loss?
How to minimise voltage drop
- Use larger cables.
- Spread the load.
- Divide the load.
- Reduce load where it doesn’t affect performance.
- Improve control.
- Demand Side Management.
What causes cable damage?
When it comes to installing wire or cabling, if not handled with care they can become damaged due to excessive tugging, pulling or even being bent in ways they should not. Not only can it cause cables to become damaged but it also means the service life of the cable is reduced as well as how well it works.
How do you lose power with underground lines?
“Buried power lines are protected from the wind ice, and tree damage that are common causes of outages, and so suffer fewer weather or vegetation-related outages,” their report concluded. “But buried lines are more vulnerable to flooding and can still fail due to equipment issues or lightning.”
What is the major reason for underground cables to be more expensive?
Undergrounding is more expensive, since the cost of burying cables at transmission voltages is several times greater than overhead power lines, and the life-cycle cost of an underground power cable is two to four times the cost of an overhead power line.
Which is the common fault likely to occur in underground cables?
The following are the faults most likely to occur in underground cables: Open-circuit fault: When there is a break in the conductor of a cable, it is called open circuit fault. The open-circuit fault can be checked by a megger.