EHV AC AND DC TRANSMISSION
General aspects and converter circuits - HVAC and HVDC links – comparison, reliability, choice of best circuit for HVDC converters- transformer connection.
Bridge converters - analysis and control – power reversal- desired features of control - actual control characteristics .
Misoperation of converters and protection - Converter disturbance - bypass action in bridges - commutation failure - basics of protection - DC reactors - voltage and current oscillations - circuit breakers – over voltage protection.
Harmonics, filters and converter charts- Characteristics and uncharacteristic harmonics - troubles due to harmonics - harmonic filters - converter charts of direct current and voltage - active and reactive power.
Design of EHV lines based on steady state limits and transient over voltages - design of extra HV cable transmission - XLPE cables - gas insulated cables – corona.
1. Padiyar, K.R., `HVDC transmission systems’, Wiley Eastern Ltd., New Delhi, 1992.
2.Arrilaga,.J.,`High voltage direct current transmission', Peter Peregninver Ltd.,London,U.K.,1983.
3.Rakosh Das Begamudre, ` Extra HVAC Transmission Engineering', Wiley Eastern Ltd.,Madras,1990.
