Kajakai: 110KV Transmission Line Study and Revised Cost Comparison of Transmission Line Voltage Alternates

摘要

This report incorporates the results of a study made in response to the request contained in the letter dated February 15, 1971, from Mr. Hamidullah Hamid, General President of Da Afghanistan breshna Moassessa, to International Engineering Company, Inc. Its purpose is twofold: (1) To investigate the technical feasibility of using 110 kV for transmission of Kajakai power to the Lashkar Gah-Girishk area and to Kandahar and, if feasibility is proven, to determine the necessary conditions for successful operation under increasing loads. These conditions include the location of the substation serving Lashkar Gab/ Girishk, the number, routing, and timing of 44kV circuits terminating at that substation, the quantity of shunt capacitance, transformer tap settings and bus voltages. (2) To revise the cost comparison between alternate transmission voltages and transmission schemes. The latest previous comparison is part of a report entitled Preliminary Plans Wakai Hydroelectric Power Plant, issued in May 1970. Since that time three concepts have changed, resulting in a significantly changed basis for evaluation. These concepts are: first , the direct route from Kajakai to Kandahar has been abandoned and all transmission schemes under consideration use the same route; second, the high voltage substation serving Lashkar Gah/ Girishk has been moved from Girishk to a nearby locationon the Kajakai- Kandahar line, thereby eliminating the 20 km high voltage tap which was part of all previous schemes; third, application of switchable shunt capacitors at the load substations makes possible the transmission of over 50 MW on a single 110 kV circuit and over 100 MW on a single 161 kV circuit. These line capacities and the feasibility of the substation location mentioned above are established by the 110 kV transmission line study described herein and the 161 kV transmission line study which was the subject of the February, 1971 report.