Graduate Thesis Or Dissertation
 

A design of a multi-compensated 230 kv, 360-mile interconnection between central and southern Thailand

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  • The integration of the southern electrical system with the balance of Thailand has many desirable features, but technical and economic problems make this a difficult task. It is over 300 miles between the nearest practical points of the interconnection. In the next ten years, there will probably be a maximum load of 300 megawatts in the southern area. The problem of transmitting power between the two areas involves a long distance and a relatively low transmission voltage. Raising the voltage above the present 230 kv nominal level adds more economic and technical problems than can currently be solved. However, if the voltage is decreased, the power loss in transmission becomes excessive and the line itself is unstable because the angle between the sending end and the receiving end voltage is excessive. This thesis presents an analytical evaluation of the electrical characteristics of this interconnection. Various percentages of shunt reactor compensation and series capacitor compensation are examined for feasibility of the interconnection at 230 kv. It was determined that the transmission line is feasible with the minimum of 50 percent compensation. The transmission line operation can be improved by the addition of more compensation, the magnitude of which must depend upon a comparative economic study.
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