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11.1. Two six-pulse converters are used in bipolar HVDC transmission system. The ac systems are 3-phase, 11000 V, 50 Hz. The input transformers have

11.1. Two six-pulse converters are used in bipolar HVDC transmission system. The ac systems are 3-phase, 11000 V, 50 Hz. The input transformers have a leakage inductance of 10 mH per phase. The current in de line is 300 A. The inverter marginal angle is 20. Resistance of each de transmission line is 1 2. Calculate firing angle of the rectifier, its output voltage and de link voltage.

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