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Cables and Connector

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The bedding on a cable consists of

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  • The bedding on a cable consists of Hessian cloth and Jute.
  • The function of bedding in a cable is to protect the metallic sheath from corrosion and mechanical injury due to armoring.
  • Bedding is typically a layer of material that is wrapped around the metallic sheath and the armoring of the cable.
  • It acts as a barrier between the metallic sheath and the armoring, preventing any corrosion or damage that may occur due to contact between the two.
  • Additionally, bedding also helps to distribute the mechanical stresses that may be present during installation or operation of the cable, which helps to increase the overall durability and lifespan of the cable.

The insulating material for a cable should have

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  • The insulating material for a cable should have low cost, high dielectric strength, and high mechanical strength.
  • The insulating material in a cable must have high dielectric strength, which refers to the ability of the material to withstand electrical stress without breaking down or allowing current to flow through it.
  • High mechanical strength is also important for the insulating material, which means the material must be able to resist deformation or damage due to mechanical stress, such as bending or twisting.
  • Additionally, the cost of the insulating material should also be considered when selecting the appropriate material for the cable.
  • All three factors - low cost, high dielectric strength, and high mechanical strength - should be balanced and considered together when selecting the appropriate insulating material for the cable.
  • Other factors that may also be important to consider include the operating temperature range of the cable, the environment in which it will be used, and any specific performance requirements that must be met.

The dielectric strength of rubber is around

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  • The dielectric strength of rubber is around 30 kV/mm.
  • The dielectric strength of rubber can vary depending on the specific type of rubber and the testing conditions, but a typical value for the dielectric strength of rubber is around 30 kV/mm.
  • This means that if you apply an electric field to a piece of rubber, it can withstand up to 30 kilovolts per millimeter of thickness before it breaks down and becomes conductive.

In capacitance grading ______ dielectric is used.

Discuss
  • In capacitance grading Composite dielectric is used.
  • Composite dielectrics are often used for capacitance grading in high voltage power cables.
  • Capacitance grading is the practice of varying the capacitance per unit length along the length of a cable to control the distribution of the electric field and reduce stress on the insulation.
  • This is typically done by using a composite dielectric material, which is a combination of two or more dielectric materials with different permittivities.
  • The use of a composite dielectric allows for a more gradual transition of the electric field and reduces the risk of electric field concentration and breakdown.
  • In addition, composite dielectrics can help to reduce the overall size and weight of the cable by allowing for a higher capacitance per unit length without compromising the insulation performance.
  • Overall, composite dielectrics can be an effective solution for improving the insulation performance and reducing the stress on high voltage power cables, particularly in applications where the electric field is high and uniformity is important.

Underground cables are laid at sufficient depth to

Discuss
  • Underground cables are laid at sufficient depth to minimize the effect of shocks and vibrations due to gassing vehicles, etc.
  •  The depth at which the cables are buried depends on various factors such as the type of cable, the voltage level, the soil conditions, and the local regulations.
  • In general, the deeper the cables are buried, the less likely they are to be affected by external factors such as shocks and vibrations.
  • This is because the soil acts as a natural buffer and helps to absorb and dissipate any external forces or stresses that might be applied to the cables.
  • In addition to minimizing the effect of shocks and vibrations, burying cables underground can also provide other benefits such as reducing the risk of damage from weather events like high winds and lightning strikes, improving the aesthetics of the surrounding area, and reducing the risk of accidental contact with the cables.

The material for armouring on cable is usually

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  • The material used for armor on cables can vary depending on the specific application, but both steel tape and galvanized steel wire are commonly used.
  • Steel tape armor involves wrapping a layer of steel tape around the outside of the cable to provide mechanical protection and improve the cable's resistance to damage from external forces.
  • The steel tape is usually coated with a layer of plastic or other insulating material to prevent it from coming into contact with the cable's insulation.
  • Galvanized steel wire armor involves using a series of steel wires wound in a helix around the cable to provide mechanical protection and improve the cable's resistance to damage.
  • The wires are typically coated with a layer of galvanized zinc to protect against corrosion.
  • Both steel tape and galvanized steel wire can provide effective protection for cables, and the choice of material will depend on factors such as the application, the environment in which the cable will be installed, and any local regulations or standards that must be met.

The cable used for high voltage application is

Discuss
  • The cable used for high voltage application is Gas-filled cable.
  • Gas-filled cables are a type of high voltage cable that consist of a central conductor surrounded by a gas-filled metal tube or pipe.
  • The gas is typically sulfur hexafluoride (SF6), which is an excellent electrical insulator with high dielectric strength.
  • The gas-filled tube or pipe is then enclosed in a protective outer sheath.
  • Gas-filled cables have several advantages over other types of high voltage cables, such as reduced electrical losses, high power density, and low electromagnetic interference (EMI).
  • They are often used in high voltage transmission systems where long distances are involved and where it is not practical to use overhead lines or underground cables.

In the cables, sheaths are used to

Discuss
  • In the cables, sheaths are used to prevent the moisture from entering the cable.
  • Moisture can be a major problem for cables, as it can degrade the insulation and lead to electrical faults and failures.
  • Therefore, it is important to prevent moisture from entering the cable by using a suitable sheath material.
  • Sheath materials can vary depending on the specific application and the environment in which the cable will be installed.
  • Common sheath materials include polyvinyl chloride (PVC), cross-linked polyethylene (XLPE), and high-density polyethylene (HDPE).
  • These materials are all highly resistant to moisture and provide good mechanical protection for the cable.

In a cable immediately above metallic sheath, ________ is provided.

Discuss
  • In a cable immediately above metallic sheath, Bedding is provided.
  • The bedding layer is usually made of a non-conductive material, such as plastic or rubber, and serves as a cushion between the metallic sheath and the outer protective layer of the cable.
  • The bedding layer also helps to distribute any stresses or forces on the cable more evenly, which can reduce the risk of damage to the cable.
  • Above the bedding layer, the cable may also have additional layers of insulation, shielding, and protective sheaths, depending on the specific application and the environment in which the cable will be installed.

Electric strength in a cable is more on

Discuss
  • Electric strength in a cable is more on layer on the conductor.
  • The electric strength is the maximum voltage that the cable can withstand without experiencing electrical breakdown or failure.
  • In general, the electric strength of a cable is typically highest at the center of the cable, where the conductor is located, and decreases as you move towards the outer layers of the cable.
  • The electric field is typically strongest at the surface of the conductor and decreases as you move further away from it.
  • However, the specific electric strength of each layer of the cable can also depend on the materials and design used.

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