In the overhead LT distribution line, the supply voltage variation at the consumer’s terminal should NOT exceed ________.

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  1. 10%
  2. 25%
  3. 5%
  4. 20%

Answer (Detailed Solution Below)

Option 3 : 5%
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Detailed Solution

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Explanation:

Voltage Variation in Overhead LT Distribution Line

Context: In an overhead low-tension (LT) distribution line, it is crucial to maintain the supply voltage within a specific range at the consumer's terminal to ensure the proper functioning of electrical appliances and to avoid any potential damage. Voltage variations can lead to inefficient performance, malfunction, or even damage to electrical equipment. Therefore, regulatory standards are set to control these variations within acceptable limits.

Correct Option Analysis:

The correct option is:

Option 3: 0.05

This means that the supply voltage variation at the consumer’s terminal should not exceed ±5% of the nominal voltage. This standard ensures that the voltage remains within safe and efficient operating limits for most electrical devices.

Additional Information

To further understand the analysis, let’s evaluate the other options:

Option 1: 0.1

A voltage variation of ±10% would be too high for most electrical devices. Such a wide range could lead to significant performance issues and potential damage to sensitive electronics. Therefore, this option is not suitable for maintaining the reliability and safety of electrical supply.

Option 2: 0.25

A voltage variation of ±25% is excessively high and would likely cause severe problems for electrical equipment. This level of variation could result in frequent malfunctions, reduced lifespan of devices, and even safety hazards such as electrical fires.

Option 4: 0.2

A voltage variation of ±20% is still too high and would pose similar risks as those mentioned for option 2. Electrical appliances are typically designed to operate within a much narrower voltage range, and such a high variation would not be acceptable for maintaining stable and reliable power supply.

Conclusion:

Maintaining the supply voltage variation within ±5% (option 3) at the consumer’s terminal is essential for ensuring the safe and efficient operation of electrical equipment. This standard helps prevent performance issues and potential damage to devices, thereby promoting reliability and safety in the electrical distribution system.

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