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Paper Information

Title: 

MEASUREMENT OF LIGHTNING IMPULSE OVERVOLTAGES ACROSS TAPPED WINDING OF DELTA CONNECTED TRANSFORMERS WITH ON LOAD TAP CHANGERS BY RECURRENT SURGE TECHNIQUE

Type: PAPER
Author(s): GHAFFARI S.,MOHSENI H.
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

DELTA CONNECTED POWER TRANSFORMERS WITH ON LOAD TAP CHANGERS ARE USED IN KHOOSESTAN ELECTRICAL NETWORK.
THE MOST COMMON ARRANGEMENT IS THE REGULATION AT THE LINE-END OF DELTA CONNECTED WINDING. IN SUCH ARRANGEMENT, DURING THE LIGHTNING IMPULSE TEST DANGEROUS OVER VOLTAGES ACROSS TAPPED WINDINGS & BETWEEN ADJACENT PHASES OCCURS. BECAUSE OF SELECTION A PROPER ARRANGEMENT OF WINDING & SUITABLE INSULATION DESIGN AND ALSO SELECTION OF A PROPER OLTC , SOME MEASUREMENTS WAS DONE IN IRAN TRANSFO HIGH VOLTAGE TEST LAB, BY RECURRENT SURGE TECHNIQUE. THIS PAPER DESCRIBES DIFFERENT APPLICATION OF OLTC & PARTICULAR INTEREST HAS BEEN DIRECTED TOWARD THE LOW VOLTAGE SURGE &RECURRENT SURGE TECHNIQUE. THEN THE METHOD OF PREPARING THE TEST CIRCUIT HAS BEEN SHOWN AS WELL AS THE RESULTS OF MEASUREMENTS. FINALLY WE ANALYSE THE RESULTS OF MEASUREMENTS AND TWO PROPER WINDING ARRANGEMENT AND SUITABLE OLTC’S APPLICATION WILL BE INTRODUCED.

 
Keyword(s): DELTA CONNECTED TRANSFORMERS, RECURRENT SURGE METHOD, IMPULSE TEST, OLTC
 
 
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