Correct Answer - Option 1 : less insulation resistance and more leakage current
Concept:
Insulation resistance:
- Insulation resistance is defined as the ratio of applied direct voltage across insulation to the corresponding current flowing through it
- The current flow through insulation is called leakage current
- Leakage resistance or insulation is the opposition that a substance offers to the flow of leakage current
Insulation resistance of the cable is given by
\(R = \frac{\rho }{{2\pi l}}\ln \left( {\frac{{{r_2}}}{{{r_1}}}} \right)\)
Where ρ = resistivity of the material
l = length of cable
r2 = radius of the outer layer of cable
r1 = radius of conductor
The resistance of insulation is inversely proportional to its length.
Application:
As the insulation resistance is inversely proportional to the cable length, with the increase in cable length, the insulation resistance decreases.
As the insulation resistance decreases, leakage current will increase.
