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What happens to insulation resistance when cable csa is halved?
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What happens to insulation resistance when increasing cable length?
The insulation resistance remains the same throughout the entire length of the conductor.
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.
Define the thermal resistance of a cable?
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.
Why does the insulation resistance fail in a PVC insulated electrical cable?
It is becase of not meeting each other
Low resistance on MICC cable how can it be corrected?
by design MICC has a very insulation high resistance. This is measured in Mega Ohms between conductors and between conductors to cable sheath. This high insulation resistance is provided by a highly compressed mineral keeping bare copper conductors apart all within a copper tube called the sheath. Each end of the cable is terminated on site by the engineer to the appropriate length. The termination provides a pot attached the the end of the cable to prevent the ingress of moisture and also a way or providing insulation to the bare conductors. The mineral insulating material in the MICC is quite absorbent so if any moisture is able to get into the cable it will reduce the insulation value of the mineral. Any breach in the integrity of the sheath will allow the cable to breath in moisture and will result in a drop in the insulation value of the cable. The breach can be caused by damage to the sheath by a sharp impact or by age where corrosion to the copper sheath results in a hole. Poorly fitted or damaged terminations can also cause a similar breach and consequent drop in insulation value. As a temporary measure if the damaged section of cable is identified. Isolating the cable from the power supply and providing gentle heat to the outside of the cable with a hand held hair dryer can often improve the insulation resistance value by gently driving out the moisture. It will of course be necessary to replace the damaged section of cable or re assemble the terminations as soon as possible.
What happens to insulation resistance when increasing cable length?
The insulation resistance remains the same throughout the entire length of the conductor.
What happens to insulation resistance when decreasing cable length?
eat dick
What happens to the value of insulation resistance of a cable when the cable gets older?
Insulation resistance should be approximately one megohm for each 1,000 volts of operating voltage, with a minimum value of one megohm. For example, a motor rated at 2,400 volts should have a minimum insulation resistance of 2.4 megohms.
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 is LV cable insulation resistance acceptance value?
The minimum acceptable insulation resistance value is calculated using the following formula: Rinsulation= (Vrated + 1 ) x (304.8 / L ) Where: Rinsulation is the minimum acceptable insulation resistance value, in mega-ohms; Vrated is the rated voltage of the cable (typically printed on the cable), in kilovolts; and L is the length of the cable, in meters (if the cable length is in feet, replace the number 304.8 with 1000).
What is the relationship between insulation resistance and length of conductor in transformers?
when length is increased insulation resistance of cable is decresed i.e.,R is inversely proportional to L where R is resistance L is length
Define the thermal resistance of a cable?
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.
How can you know that power cable need to be replaced?
you check the insulation and it is degraded,hole in it or it does not have a very high ohms of resistance,which means the insulation is bad.
Can insulation resistance of cable be checked with a volt meter?
No. A volt-ohmmeter will not check insulation. To check cable insulation you need a special device (called a megger) made for the purpose that imposes a high voltage and measures current leaks.
Why does the insulation resistance fail in a PVC insulated electrical cable?
It is becase of not meeting each other
What should be minimum insulation resistance value for 11 kV HT cable?
65 meg ohm if it is 11 kv
What is the minimum acceptable value of insulation resistance of instrument cable?
more than 1 G ohms is acceptable. cheers
