12-07-2013, 12:56 PM
MODERN TRENDS IN POWER TRANSMISSION
MODERN TRENDS IN POWER.ppt (Size: 249.5 KB / Downloads: 235)
Introduction
The concept of six phase transmission lines was introduced by Barns & Barthold during 1972.
Six phase power system is a part of multiphase power system
Six phase transmission lines are more popular due to its increased power transfer capability by 1.732 times
High Phase Order(HPO) transmission is the use of more than the conventional three phases to transmit power over a given transmission corridor
Feasibility of an interconnected 3-phase / 6-phase transmission systems
Basic feasibility of interconnected 3 phase / 6 phase transmission system has been reported for
Normal steady state operation
over voltages
insulation requirements
power flow etc., in several studies.
Power transfer capability
Consider 3 practical cases as follows:
(A). 138 KV, 3 phase double circuit line configuration
(B). 230 KV, 3ph transmission line configuration
©. 138 KV, 6 phase transmission line configuration
To convert the existing 3phase double circuit line to 6phase transmission line with little modification of the terminal equipment in the substations to provide 3phase / 6phase transformer etc. Then power transferred is given by
CONCLUSION
Six phase transmission technology provides a technique for reducing physical space requirements for transmission lines while providing a means for increasing power transfer capacity of a new or existing transmission corridor.The cost for constructing a new six-phase line versus a three phase line of the same voltage level, is not excessive, particularly if physical constraints exist. In India, the 6-phase transmission system is not existing because there is no technical knowledge over the operation of the 6-phase systems.