Cable Systems
Cable Systems
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Cables are an essential component of a modern power system. The proper selection of the cables, design and installation of the cable system, is important for the secure and reliable operation of the power system.
In determining the most suitable selection for a particular application, many parameters are considered. Factors to consider are the application, a historical knowledge of the cable, types of cable systems, manufacturing practices and industry standards.
In determining the most suitable selection for a particular application, many parameters are considered. Factors to consider are the application, a historical knowledge of the cable, types of cable systems, manufacturing practices and industry standards.
A cable installation system should be designed with knowledge of the cable that has been selected, the intended application and the proper installation techniques for that cable. A cable system designed without regard to the installation methods to be used may not be possible to install. This is particularly important for underground transmission lines, underground low voltage cables, substation cables and cable distribution in large plants such as LNG plants.
For example, for underground cable installation, in some cases there can be large differences in pulling tension depending on the direction of pull that is chosen. If the tension is too large in one direction, using the other direction may have significant impact on the installation sequence and scheduling.
BESST use ETAP software for power system studies and Solutions Electrical software for cable sizing and voltage drop to AS 3008.
For example, for underground cable installation, in some cases there can be large differences in pulling tension depending on the direction of pull that is chosen. If the tension is too large in one direction, using the other direction may have significant impact on the installation sequence and scheduling.
BESST use ETAP software for power system studies and Solutions Electrical software for cable sizing and voltage drop to AS 3008.
Items to Consider in Cable Sizing and Installation may include:
- Cable Sizing - based on ampacity, voltage drop and prospective short circuit levels, thermal considerations, earth fault-loop
impedance
- Cable Type – insulation, sheath, jacket, protection
- Cable Accessories – required terminations and joints
- Installation Planning – route selection, construction methods, maintenance requirements, existing utilities, environmental
concerns, permits, licenses, off-cuts, copper theft security
- Cable System Installation – cable support, protection, structures, conduit / duct sizing, raceways, cable tray, trenches,
tunnels, directional boring, supervision, testing, typical installation diagrams
- Cable Schedules - Power, Control, Instrumentation, Communication, Data, Protection, Fibre Optic
impedance
- Cable Type – insulation, sheath, jacket, protection
- Cable Accessories – required terminations and joints
- Installation Planning – route selection, construction methods, maintenance requirements, existing utilities, environmental
concerns, permits, licenses, off-cuts, copper theft security
- Cable System Installation – cable support, protection, structures, conduit / duct sizing, raceways, cable tray, trenches,
tunnels, directional boring, supervision, testing, typical installation diagrams
- Cable Schedules - Power, Control, Instrumentation, Communication, Data, Protection, Fibre Optic
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Items to consider for Hazardous Area Installations may include: - Zoning – zone 0, 1 or 2 - Regulations and Standards – group, class, temperature classification - Installation – segregation, protection, equipotential bonding, testing - Intrinsically Safe – entity calculations, barrier selection, junction boxes - Terminations – glands, FLP terminations |
Termination Area
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