Ungrad, Helmut <br/><br/>
Protection techniques in electrical energy systems 
Helmut Ungrad, Wilibald Winkler and Andrzej Wiszniewski: translated by Peter G. Harrison. 
 - New York  Marcel Dekker  1995 
 - 387 p. : ill. ; 24 cm. 
<br/><br/> Translation of: Schutztechnik in Elektroenergiesystemen. 
<br/><br/>p. 364-381. 
<br/><br/><label>ISBN: </label>0824796608  RM386.25 
<br/><br/><label>LCCN: </label>95-32278 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric power systems--Protection