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Archive: Category «Transmission and Distribution»

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Understanding Underground Electric Transmission Cables

Underground cables have different technical requirements than overhead lines and have different environmental impacts. Due to their different physical, environmental, and construction needs, underground transmission generally costs more and may… Read more

Sep 21, 2011 | Bipul Raman

Underground XLPE cables left to right: 345 kV, 138 kV, 69 kV, and distribution

Gas-Insulated Transmission Line – GIL

The gas-insulated transmission line (GIL) is a system for the transmission of electricity at high power ratings over long distances. In cases where overhead lines are not possible, the GIL… Read more

Jan 12, 2011 | Edvard

Gas-Insulated Transmission Line - GIL

Basics Of Subtransmission Systems

Subtransmission systems are those circuits that supply distribution substations. Several different subtransmission systems can supply distribution substations. Common subtransmission voltages include 34.5, 69, 115, and 138 kV. Higher voltage subtransmission… Read more

Dec 17, 2010 | Edvard

Transmission Lines

Power System Stability

Power system stability is the ability of the system, for a given initial operating condition, to regain a normal state of equilibrium after being subjected to a disturbance. Stability is… Read more

Oct 23, 2010 | Edvard

power-system-stability-2
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