Amy Carter, saying she was proud to be the daughter of a man who advocated human rights, was arrested with two other protesters outside the South African Embassy yesterday, while her brother, Chip, looked on with other supporters of the continuing antiapartheid demonstrations there.

"This is such a fundamental wrong being committed," said Amy Carter, 17, youngest child of former president Jimmy Carter.

Carter, now enrolled in high school in Atlanta, and her brother joined about 20 picketers in a legal demonstration a block south of the embassy.

But when she and a married couple representing the National Council for Japanese-American Redress walked onto the embassy grounds and began singing a civil rights anthem, they were arrested.

"When I was here in the sixth grade, our model U.N. project was apartheid," recalled Carter, who said she had called home to Plains, Ga., for permission to participate in the embassy demonstration.

Randall Robinson, coordinator of the embassy protests, praised the former president, saying his human rights program saved thousands of lives.

He said antiapartheid demonstrations, which began here Nov. 21, now are conducted in 28 cities on a regular basis, and have resulted in the arrests of about 2,800 persons.