The number of conductors required for transmitting power is more. Does not require any intermediate substations for reactive power compensation. Requires intermediate substations for compensation. Very fast and accurate power flow control is possible.
Power flow control is slow and is very difficult. Skin effect is absent resulting in uniform distribution of current density across the cross-section of the conductor. Skin effect is present due to which current density is non-uniformly distributed across the cross-section f the conductor. Corona loss and radio interferences are absent resulting in less insulation level required for the transmission line.
Corona loss and radio interferences are more due to which high insulation level is required for the transmission line. Voltage in the line does not fluctuate with the load. Voltage in the line fluctuates with the load. Does not require a double circuit, in this systems earth return is used. Always requires a double circuit. Transmission through underground or marine is also possible. Limit is imposed on the length of the cable.
Transmission losses are less due to the absence of flow of reactive power. Transmission losses are more due to the flow of reactive power. The fault levels of the two networks are unaffected and remain unchanged when interconnected.
Share: Facebook Twitter Linkedin. Electrical power needs to be transmitted over longer distances from generating stations to electrical substations to be distributed to the consumers. Though DC transmission system was the first to born, soon it was replaced by AC transmission system. Earlier DC systems developed by the Edison's company could not transmit the power more than a couple of kilometers. Thus, only the customers within that much short range of the dc power plants could get the power supply.
As the transmission distance increases, voltage drops significantly due to the I 2 R loss. A solution for this is to increase the transmission line voltage. But, there was no convenient way to change the voltage level of DC power. With the development of AC, it became very easy to change the voltage levels of AC power using transformers.
Power could now be transferred over longer distances using AC, by stepping up the voltage level for transmission and stepping down again for utilization. But, the developments in power electronics made us reconsider the DC power for transmission purposes. The AC vs. DC question has been around since the era of the war of currents. Improvements in DC system A major problem that Edison could not solve was how to increase the transmission voltage of DC for transmitting the power over longer distances.
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