Скачать или смотреть The power of extra high voltage underground cables Borneo Sarawak EE

An extra high voltage (EHV) underground cable is a type of power cable that is used to transmit large amounts of electrical energy at high voltages over long distances, typically between 132 kV and 500 kV. These cables are typically used in urban areas where it is not feasible to install overhead transmission lines due to space constraints or aesthetic considerations.

EHV underground cables are typically designed as a multi-core cable, consisting of several insulated conductors arranged in a concentric configuration. The cable typically has a metallic sheath that provides electrical shielding and protection against mechanical damage. The metallic sheath is typically made of lead, aluminum, or copper, and is bonded to earth to reduce the risk of electric shock.

The insulation material used in EHV underground cables is typically a high-quality cross-linked polyethylene (XLPE) or ethylene propylene rubber (EPR). These materials provide excellent electrical and thermal properties, as well as good resistance to moisture, heat, and chemical degradation.

EHV underground cables require careful design and installation to ensure that they operate safely and reliably. The cable route must be carefully selected to avoid interference with other underground services and structures, and to ensure that the cable is protected from mechanical damage and moisture ingress. The cable installation typically involves excavating a trench and laying the cable in a bed of sand or other suitable material, and then backfilling the trench.

EHV underground cables also require regular maintenance and testing to ensure that they continue to operate safely and reliably. This may include regular visual inspections, cable testing to detect any faults or degradation in the cable insulation, and periodic replacement of cable accessories such as terminations and joints.

Overall, EHV underground cables are a critical component of modern power systems, providing a safe and reliable means of transmitting large amounts of electrical energy over long distances in urban areas. With careful design, installation, and maintenance, these cables can provide reliable service for many decades.