Robert Victor Grahn, 63, a retired Navy captain who was a founder and chairman of the AC/DC Committee, a consumer group concerned with electric utility rates in Washington, died of an aneurysm Wednesday at George Washington University Hospital.

Capt. Grahn was born in Newark and graduated from the Stevens Institute of Technology. He went into the Navy in World War II, was released from active service after the war, and then returned to active duty in 1948. He retired in 1970.

An ordnance specialist, he served with the Naval Materiel Command in Washington from 1964 to 19t67. He was head of the Navy Lant office at Aerojeg General in Azusa, Calif., at the time of his retirement.

As chairman of the AC/DC Committee, Capt. Grahn appeared before the D. C. Public Service Commission to represent consumers in gas as well as electric rate proceedings. He also testified on energy matters before Congress and the D. C. City Council. He was a member of the D. C. Consumer Utility Board and of the Technical Study Committee.

Survivors include his wife, Shirley, of the home in Washington, and two brothers, Eric, of Bricktown, N. J., and Douglas, of Chicago, Ill.