Hvdc Light

May 5th, 2015
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The first commercially used HVDC link in the world was built in 1954 between the mainland of Sweden and island of Gotland. Since the technique of power transmission by HVDC has been continuously developed. In India, the first HVDC line in Rihand-Delhi in 1991 i.e. I 500 KV, 800 Mkl, 1000 KM. In Maharashtra in between Chandrapur & Padaghe at 1500 KV & 1000 MV.

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Hvdc LightHVDC Transmission Lines1. INTRODUCTIONThe first commercially used HVDC link in the world was built in 1954 between the mainland of Sweden and island of Gotland. Since the technique of power transmission by HVDC has been continuously developed. In India, the first HVDC line in Rihand-Delhi in 1991 i.e. I 500 KV, 800 Mkl, 1000 KM. In Maharashtra in between Chandrapur & Padaghe at 1500 KV & 1000 MV. Global HVDC transmission capacity has increase from 20 MW in 1954 to 17.9 GW in 1984. Now the growth of DC transmission capacity has reached an average of 2500 MW/year.Govt. Poly, Washim1HVDC Transmission Lines2. ADVANTAGES OF HVDC SYSTEM1. The cost of d.c. transmission line is less than 3 - phase a.c. line because only two conductors are necessary for D.C. line. 2. Tower designs are simple. 3. The dielectric strength of cable is high . 4. The dielectric loss is low. 5. For D.C. overhead transmission lines length is unlimited. 6. Power transmission capacity is higher than a.c. 7. Corona & radio frequency interference losses are less. 8. HVDC link has accurate & quick control of power in the required direction.3. LIMITATION OF HVDC TRANSMISSION1. Transformer for step up step down voltages are not available in case of HVDC. 2. The terminal equipment is costly. 3. Reliable d.c. ckt. Breakers for higher ratings are not available. 4. Earth current may cause some side effects. 5. Reactive MVA cannot be transferred over a HVDC link. 6. Although inverters a

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