SERIES COMPENSATED TRANSMISSION LIVES
Date
1967-02
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Degree Level
Masters
Abstract
Previous studies of transmission line performance have clearly indicated that if a sufficiently high transmission voltage is adopted,
large blocks of power can be successfully transmitted over relatively long distances. It has also been demonstrated that the power trans—mission capability of lines up to 380 kv can be increased by the use of series capacitors to compensate for some portion of the line reactance.
This thesis examines the performance of 500 kv and 735 kv, 500 mile series compensated lines. .The steady state operation of two large systems interconnected by such lines indicate that shunt compensation is required to maintain the line voltage profiles within reasonable limits. Using a line voltage tolerance of ± 5 percent it was found that the steady state limit was dictated by this constraint rather than by the displacement angle between the voltages behind the synchronous reactances of the two equivalent machines. In many cases, the current in the series capacitor banks for a fault on the line exceeds twice full load current and it is therefore essential to short circuit the capacitors in these cases to protect them from damage due to overvoltage. The short-circuited capacitors were reinserted after the fault was cleared. The transient stability limit for a three phase fault on the series compensated interconnector was found to be lower than the steady state limit dictated by the voltage profile considerations. This limit increases slightly with a decrease in capacitor reinsertion time. The transient stability limit for single phase faults was found to be slightly higher than the limit for three phase faults but still lower than the steady state limit.
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Degree
Master of Science (M.Sc.)
Department
Electrical Engineering