Power sytem protection  / 
edited by The Electricity Training Association 
 - London :  The Institution of electrical Engineers,  1969 
 - 473 p. :  ill. ;  24 cm. 
<br/><br/>Volume 3. Application -- Volume 4. Digital protection and signaling 
<br/><br/><label>ISBN: </label>085296837X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric power systems--Protection