Ieee guide for the protection of network transformers / 
Sponsor power system relaying committee of the ieee power engineering Society 
 - 30 páginas 
 - Ansi/ieee c37.108-1989 .
<br/><br/> "approved february 2, 1989 ieee standard board, approved july 26, 1989 american national standards institute" 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Transformadores eléctricos--Proteccion--Normas
<br/><br/><label>LC Class. No.: </label>TK2551  / I44