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Question

What type of protection is used for LT lines passing through agricultural fields?

The correct answer is

PVC protection

LT Line Protection in Agricultural Fields

Low Tension (LT) lines passing through agricultural fields require specific types of protection. These areas are often subjected to various activities, including ploughing, harvesting, and movement of machinery, which can pose a risk to the power lines.

The primary concerns for LT lines in agricultural settings include:

  • Accidental contact with farming equipment.
  • Damage from vegetation growth or cutting.
  • Increased risk of earth faults due to wet soil or standing water.
  • Safety hazards for farmers and livestock.

To mitigate these risks, the lines need physical protection and proper insulation. Among the options provided, PVC protection is a common and effective method used for LT lines, especially when laid underground or when using insulated overhead conductors in sensitive areas like agricultural fields.

Why PVC Protection for Agricultural Fields?

PVC (Polyvinyl Chloride) is a widely used material in electrical cables and wiring due to its excellent insulating properties, durability, and resistance to moisture and chemicals. When used for protecting LT lines:

  • It provides a strong physical barrier against external damage from tools or machinery.
  • The insulation prevents direct contact, reducing the risk of electric shock.
  • It helps protect the conductors from environmental degradation.

While overhead lines might primarily rely on pole height and distance, cables laid in agricultural fields often use PVC sheathing for robust protection. Insulated overhead cables with PVC or similar sheathing are also used in areas where bare conductors pose a higher risk.

Other options like "Zero factor protection", "Lewis defense", and "Direct protection" are not standard terminology for this type of physical and electrical protection applied to power lines in agricultural environments.

Therefore, using materials like PVC to protect LT lines helps ensure safety and reliability in agricultural fields.

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Important Questions from Protective Relays

  1. Earth breaker circuit uses

  2. A relay whose characteristic is modified by additional mechanical or electromagnetic procession is termed as

  3. A 3-phase transformer rated for 33/6.6 kV is connected to a star/delta and the current transfer on the LV side has a ratio of 500 : 5. Determine the ratio of the current transformer on the HV side.

  4. Identify whether the given statements are true or false.

    1. The Merz-Price calculating current principle is more suitable for generators than transformers.

    2. The differential protection scheme for longer lines is very cheap.
  5. Identify whether the given statements are true or false.

    1. The two most commonly used schemes for bus bar protection are differential protection and fault bus protection.

    2. The most important stator winding fault of an alternator is the earth fault.
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