00479nam a22001457a 4500008004100000020001800041040005500059080001600114100001500130245008700145260004300232300001400275650002300289653002100312230613b        |||||||| |||| 00| 0 eng d  a81-224-0594-0  aNational Science LibrarycNational Science Library  a621.316bN41 aSingh, L P  aDigital protection: bProtective relaying from electromechanical to microprocessor  aNew Delhi: bWiley Eastern Ltd, c1994  axi, 231p.  aDigital protection  aPolyphase relays