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Pharos University EE-385. Electrical Power & Machines “Electrical Engineering Dept” Prepared By: Dr. Sahar Abd El Moneim Moussa. UGC UNDERGROUND CABLE (Part 1). Uses of UGC.

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Pharos university ee 385

Pharos UniversityEE-385

Electrical Power & Machines

“Electrical Engineering Dept”

Prepared By:

Dr. SaharAbd El MoneimMoussa

Dr. Sahar Abd El Moneim Moussa


Ugc underground cable part 1

UGCUNDERGROUND CABLE(Part 1)

Dr. Sahar Abd El Moneim Moussa


Uses of ugc
Uses of UGC

  • It is used to transmit electric power, when construction of OHTL is undesirable, for example, in crossing under seawater, highways or rail ways, or in approaches to the territories of high density populated areas.

Dr. Sahar Abd El Moneim Moussa


Construction of ugc
Construction of UGC

  • UGC consists of:

  • Core conductor

  • Core insulation

Dr. Sahar Abd El Moneim Moussa


  • Core Conductor:

  • Hard drawn Copper Conductors are used in low voltage networks, as it can withstand thermal stresses during overloading

  • Hard drawn Aluminum Conductors are used in medium voltage and high voltage distribution network to decrease costs where 3-phase load are balanced and hence overloading problem is minimized

Dr. Sahar Abd El Moneim Moussa



  • Cable Insulation:

  • Oil Impregnated-Paper Insulation (OIL):

    Advantages:

  • Highest dielectric strength among all cable insulation material.

  • Long life-time.

Dr. Sahar Abd El Moneim Moussa


OIL FILLED CABLES

Dr. Sahar Abd El Moneim Moussa


EHV DIRECT GAS PRESSURE CABLES

Dr. Sahar Abd El Moneim Moussa


b) Polymeric Martials Insulated Cables:

  • Thermoplastic materials:

  • Polyetheylene (PE)

  • Polyvinyl Chloride (PVC)

  • Thermosetting materials:

  • Cross linked Polyethylene (XLPE)

  • Ethylene-Propylene Rubber (EPR)

Dr. Sahar Abd El Moneim Moussa


Advantages:

  • Reduced weight

  • Easier to repair faults

  • Reduced risk of flammability and fire propagation.

  • More economical in both initial costs and life time

Dr. Sahar Abd El Moneim Moussa


Dielectric field of High-voltage Power Cables:

Dr. Sahar Abd El Moneim Moussa


SHIELDED CABLES

Dr. Sahar Abd El Moneim Moussa


CABLE CONSTRUCTION

Dr. Sahar Abd El Moneim Moussa


Cable parameters
CABLE PARAMETERS

1- Effective Cable Resistance

Where,

 : is the conductor resistivity in .m

l : is the conductor length in m

A : is the conductor cross-sectional area in m2

Dr. Sahar Abd El Moneim Moussa


And,

Where,

: is the skin effect

: is the proximity effect

: is the metallic sheath effect

: is the steel tape armoring effect

Dr. Sahar Abd El Moneim Moussa


2- Cable Inductance

The inductance of a single-core in three-phase power cable

Where,

GMD : is the geometric mean distance between centers of

core conductors

GMR : is the geometric mean radius of the core conductors

Dr. Sahar Abd El Moneim Moussa


2- Cable Capacitance

The inductance of a single-core in three-phase power cable

Dr. Sahar Abd El Moneim Moussa



Therefore, the dielectric stress will be:

Dr. Sahar Abd El Moneim Moussa





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