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Insulation Resistance of Cable Video Lecture | Power Systems - Electrical Engineering (EE)

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FAQs on Insulation Resistance of Cable Video Lecture - Power Systems - Electrical Engineering (EE)

1. What is insulation resistance in electrical cables?
Ans. Insulation resistance in electrical cables refers to the measure of the insulation's ability to resist the flow of current through it. It is an important parameter used to determine the overall health and safety of the cable. A higher insulation resistance indicates better quality insulation and lesser chances of leakage current.
2. Why is insulation resistance important in electrical cables?
Ans. Insulation resistance is crucial in electrical cables as it helps to ensure the safe and reliable operation of the electrical system. It prevents leakage current, which can lead to faults, short circuits, and electrical shocks. By measuring insulation resistance, potential risks and weaknesses in the cable's insulation can be identified, allowing for timely maintenance and repairs.
3. How is insulation resistance measured in electrical cables?
Ans. Insulation resistance in electrical cables is measured by using a specialized instrument called an insulation resistance tester or a megohmmeter. The tester applies a high DC voltage to the cable and measures the resulting current flow. The insulation resistance is then calculated by dividing the applied voltage by the measured current.
4. What are acceptable insulation resistance values for electrical cables?
Ans. The acceptable insulation resistance values for electrical cables can vary depending on several factors, such as the type of cable, its voltage rating, and the specific application. Generally, for low-voltage cables, an insulation resistance value of at least 1 megaohm (1 MΩ) per kilovolt (kV) of cable voltage is considered acceptable. However, it is important to consult relevant standards and guidelines for specific industry requirements.
5. What factors can affect the insulation resistance of electrical cables?
Ans. Several factors can influence the insulation resistance of electrical cables. These include temperature, moisture or humidity levels, the presence of contaminants, age and condition of the insulation material, mechanical stress, and the type of insulation used. It is essential to regularly monitor and maintain cables to ensure their insulation resistance remains within acceptable limits.
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