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Paper Information

Title: 

CALCULATION OF TEMPERATURE RISES AND LOSS OF LIFE OF TRANSFORMERS BY ON-LINE LOAD MONITORING

Type: PAPER
Author(s): AGHAIFAR ARASH,AZIZI HOSSEIN
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

ONE OF THE MAJOR PROBLEMS OF OPERATING DISTRIBUTION AND POWER TRANSFORMERS IN THE NETWORK IS HOW TO OVERLOAD THEM BY HAVING A SAFE MARGIN AND TO CALCULATE THE EFFECTS OF THIS LOADING ON INSULATION DETERIORATION AND ITS LOSS OF LIFE. ALTHOUGH THE SAFE MARGINS AND LIMITATIONS FOR OVERLOADING ARE STATED IN DIFFERENT STANDARDS, BUT THEIR APPLICATIONS ARE NOT PRACTICAL DUE TO ITS UNCERTAINTY AND LACK OF ON-LINE MONITORING. IN THIS PAPER THE THERMAL EQUATIONS OF TRANSFORMERS ARE DESCRIBED AND TOP OIL AND HOT-SPOT TEMPERATURES ARE SHOWN BY A TIME VARIANT EXPONENTIAL FUNCTIONS. THEN THE LOSS OF LIFE OVER A CERTAIN LOADING CYCLE IS DEFINED. WITH THE HELP OF DIFFERENTIAL EQUATIONS A METHOD FOR ONLINE MONITORING OF TRANSFORMERS INCLUDING THE MEASUREMENT OF TOP OIL AND HOT-SPOT AND THE LOSS OF LIFE ENTAILED IS PROPOSED. BY USING THE “TRANSFORMER LOADING” SOFTWARE, A SAMPLE LOADING WAS TESTED ON A POWER TRANSFORMER AND AS A RESULT THE CURVES OF TOP OIL, HOT-SPOT AND THE LOSS OF LIFE ARE PRESENTED AS A FUNCTION OF TIME.

 
Keyword(s): LOADING, POWER TRANSFORMERS, TEMPERATURE RISE, LOSS OF LIFE, TOP OIL AND HOT-SPOT TEMPERATURE
 
 
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