Which among the following cable are generally suited for the voltage u...
The following types of cables are generally used for 3-phase service:
- Belted cables - up to 11 kV
- Screened cables - from 22 kV to 66 kV
- Pressure cables - beyond 66 kV
Belted cables:
- These cables are used for voltages up to 11 kV but in extraordinary cases, their use may be extended up to 22 kV
- The belted type construction is suitable only for low and medium voltages as the electrostatic stresses developed in the cables for these voltages are more or less radial i.e., across the insulation
- For high voltages (beyond 22 kV), the tangential stresses also become important
- These stresses act along the layers of paper insulation
- As the insulation resistance of paper is quite small along the layers, therefore, tangential stresses set up leakage current along the layers of paper insulation
- The leakage current causes local heating, resulting in the risk of breakdown of insulation at any moment
View all questions of this testWhich among the following cable are generally suited for the voltage u...
Introduction:
In electrical engineering, cables are used to transmit electrical power from one point to another. Different types of cables are used depending on the voltage level and application requirements. The question asks about the type of cable generally suited for voltage up to 11 kV.
Belted Cables:
- Belted cables are one of the types of cables used for high voltage applications.
- These cables consist of multiple insulated conductors arranged in a circular configuration and held together by a metallic or non-metallic belt.
- The belt provides mechanical strength and protects the conductors from external influences.
- Belted cables are commonly used for medium voltage applications up to 11 kV.
- They are suitable for both underground and overhead installations.
Screened Cables:
- Screened cables, also known as shielded cables, are another type of cables used for high voltage applications.
- These cables have an additional layer of metallic shielding around the insulated conductors.
- The shielding layer is usually made of copper or aluminum and provides protection against electromagnetic interference.
- Screened cables are commonly used in high voltage applications, typically above 11 kV.
- They are suitable for underground installations and are commonly used in power distribution systems.
Pressure Cables:
- Pressure cables, also known as pipe-type cables or fluid-filled cables, are a different type of cables used for high voltage applications.
- These cables consist of insulated conductors enclosed in a fluid-filled pipe or tube.
- The fluid, usually oil, provides insulation and cooling for the conductors.
- Pressure cables are commonly used for very high voltage applications, typically above 66 kV.
- They are suitable for both underground and underwater installations.
Conclusion:
Based on the given options, belt cables are generally suited for the voltage up to 11 kV. This type of cable is commonly used for medium voltage applications and provides the necessary insulation and mechanical strength. Screened cables and pressure cables are typically used for higher voltage levels.