HVDC Power transmission system with metallic return conductor

Details HVDC Power transmission system with metallic return conductor HVDC Power transmission system with metallic return conductor

1980-10-20

1982-07-20

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 62, 361 91, 361111, 361127, 363 51, H02H 710

Patent

active

043409210

ABSTRACT:
A high voltage d.c. power transmission system utilizes a metallic return conductor for carrying return current between converters at opposite ends of the system. The return conductor is connected to earth ground at one end of the system and is otherwise insulated from earth ground so that its opposite end is floating with respect to d.c. The return conductor has no capacitor connected from earth ground thereto of a size capable of limiting the voltage thereon. But connected between said opposite end of the return conductor and earth ground is a valve-type surge arrestor having a primarily zinc-oxide valve element and no gap in series therewith. This surge arrestor has a protective level that is reached by the overvoltages produced by the normal operating transients of the system, such as those produced by system start-up and commutation failures.

REFERENCES:
patent: 3531710 (1970-09-01), Breuer et al.
patent: 3805114 (1974-04-01), Matsuoka et al.
patent: 3832620 (1974-08-01), Pollard
patent: 3857070 (1974-12-01), Smith
patent: 3928245 (1975-12-01), Fishman et al.
patent: 3959543 (1976-05-01), Ellis
"A New Concept in Station Arrester Design", _by Sakshaug et al., I.E.E.E. Transactions on Power Apparatus and Systems, vol. PAS-96, No. 2, Mar./Apr. 1977, pp. 647-656.
"Monopolar Metallic Return Operation of Long Distance H.V.D.C. Transmission Systems", by Hingorani, I.E.E.E. Transactions on Power and Systems, pp. 554-563, 1971.

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