Question:
One of the main causes of deterioration of cable dielectric is _______.
One of the main causes of deterioration of cable dielectric is _______.
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Voids → Partial discharges → Dielectric breakdown. Always bad for cable health!
Updated On: Jun 24, 2025
- formation of voids
- cable capacitance
- formation of voids and cable capacitance
- cable power factor
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The Correct Option is A
Solution and Explanation
Step 1: Dielectric Breakdown in Cables
Insulating materials in cables can deteriorate over time due to electrical, thermal, and mechanical stresses.
Step 2: Voids — The Silent Killers
Voids are small air pockets formed due to improper manufacturing or aging. Air has a much lower dielectric strength than solid insulation. Under high voltage, partial discharges occur within these voids, leading to thermal stress and chemical decomposition of insulation.
Step 3: Why Not Capacitance or Power Factor?
- Cable capacitance is an inherent property, not a deteriorating factor.
- Power factor affects losses but doesn't directly degrade insulation.
Conclusion:
Formation of voids is the main root cause of insulation breakdown.
Insulating materials in cables can deteriorate over time due to electrical, thermal, and mechanical stresses.
Step 2: Voids — The Silent Killers
Voids are small air pockets formed due to improper manufacturing or aging. Air has a much lower dielectric strength than solid insulation. Under high voltage, partial discharges occur within these voids, leading to thermal stress and chemical decomposition of insulation.
Step 3: Why Not Capacitance or Power Factor?
- Cable capacitance is an inherent property, not a deteriorating factor.
- Power factor affects losses but doesn't directly degrade insulation.
Conclusion:
Formation of voids is the main root cause of insulation breakdown.
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