FIGURE 6.34 Air-conditioning system with lockout relay Legend Сontactor 240 V/10/60 Hz COMP Compressor CT Compressor intemal thermostat HR Heating relay Indoor fan relay Indoor fan motor Lockout relay COMP IFR IFM LA т Thermostat Heating Source HR IFM IFR 24 volts RW HR T Y HPS LPS LR CT G LR IFR

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.