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No. Conductor resistance is. Cable insulation resistance to ground is inversely proportional to its length. The longer the cable, the more leakage path to ground; therefore, the lower the insulation resistance to ground.
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∙ 15y ago
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∙ 11y ago1000 KVA Megger is generally used power Power Cabelling.
AnswerUsing a high-voltage direct-current test set (such as a 'HiPot' tester) which can subject the cable insulation to voltages higher than their rated values for a set period of time. The actual test voltages and times are as recommended by the cable manufacturers and endorsed by the electricity network companies responsible for installing the cables.
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∙ 12y agothe temperature that can be withstood by a cable is called its thermal resistance ...
the more the thermal resistance of cable the safer it is ....
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Define 2XFY in electric cable?
Copper xlpe armoured cable
What is insolation resistance?
I think you mean 'insulation resistance'. This is exactly what it says it is, it is the resistance between opposite sides of an insulator or dielectric. It is in the order of megohms and, in the case of a cable, is inversely proportional to its length -i.e. the longer the cable, the lower its insulation resistance.
What happens if a lengthy cable is connected to a load?
resistance will increase because we know that resistance is directly proportional to length.AnswerThe increase in resistance will cause an increase in the voltage drop along the cable; if this is excessive, then a cable with a greater cross-sectional area must be used to compensate. Howto choose an appropriate cable for a given length can be determined from the relevant wiring regulations for your country.
What happens to insulation resistance when increasing cable length?
The insulation resistance remains the same throughout the entire length of the conductor.
Define thermal stress and thermal strain?
Thermal stress ( and strain) arrises at situations, when there are some area with diffrent temperature in the same body. Or at situatiom - one konstruction part restricts thermal expansion ( dilatation ) another part. Or - two parts (f.e. austenit - ferrit steels ) are in welded connection.
What is the Dimensional formula of thermal resistance?
no
Which has the greater resistance thick wire or a thin of the same length?
The thermal resistance of a wire is proportional to ln(r2/r1), meaning that a thicker wire has a greater thermal resistance.
Define Thermal Energy.?
Thermal Energy: Substance that has energy from the movement of its particles.
Which cable has less losses?
Thicker cable loses less thermal energy.
Define 2XFY in electric cable?
Copper xlpe armoured cable
properties of plastic?
Strength. Weather Resistance. Fire Resistance. Durability. Dimensional Stability. Chemical Resistance. Thermal Resistance. Working Conditions.
What is thermal risistance?
It is the rate of resistance of a material to heat.
What are some examples of items with low conductivity?
Thermal resistance: diamond Electrical resistance: copper Optical resistance: quartz
Define thermal conductivity?
ability of the material to resist the temperature
What increases the?
The thermal vibration of the atoms in the material increases the resistance of that substance. The resistance is greatly depends on temperature.
What are the sources of resistance to change?
A: There is only one source thermal
Define Internal Resistance?
The internal resistance of a device is the resistance in ohms of that device. It is the resistance electrons need to overcome before electricity is said to flow.
