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Power Transmission System - Coggle Diagram
Power Transmission System
GENERAL
Transmission lines transmits and delivers electricity from producers to consumers over long distances.
Interconnected transmission lines becomes transmission networks, also known as transmission system and
transmission grid.
Electrical energy can be transmitted in either AC or DC form.
TRANSMISSION NETWORK VOLTAGE
TRANSMISSION LINES VOLTAGE LEVEL
Extra high voltage lines
345kv, 500kv, 785kv
Interconnection between systems
(National Grid)
High voltage lines
120kv, 132kv, 220kv, 275kv
Interconnection between sub-stations
Sub-transmission lines
33kv, 45kv, 66kv, 69kv, 120kv
Substation and large customer
Distribution lines
2.4kv-45kv, 11kv, 15kv, 22kv
Supplies standard distribution customers
High voltage DC lines
120kv-600kv
Interconnection between regions (Oregon-California, Malaysia-Thailand)
Step up transformers
500kv, 275kv, 132kv
Major distribution stations
33/11kv, 22/11kv
Transmission main intake
275/33/11, 132/33/11, 132/11
Switching sub-station
33kv, 11kv
Distribution sub-station
33/0.4kv, 22/0.4kv, 11/0.4kv
Customer
400v (3 phase), 230v (single-phase)
GRID INTERCONNECTION
A wide area synchronous grid, also known as an
"interconnection"
in North America, directly connects a large number of generators delivering AC power with the same relative frequency, to a large number of consumers.
TNB Grid is interconnected with Singapore and Thailand, but not with Sabah and Sarawak..
TRANSMISSION LINES
Historically, transmission and distribution lines were owned by the same company.
Starting in the 1990s, many countries have liberalized the regulation of the electricity market in ways that have led to the separation of the electricity transmission business from the distribution business.
In Malaysia, transmission and distribution systems are still under one utility but generation no longer under one utility. Instead, generation is served by several generating companies.