Paper Information

Title: 

PD LOCATING IN TRANSFORMERS USING SIGNAL ENERGY INDEX

Type: PAPER
Author(s): ROOHBAKHSH A.R.,NAFAR M.,GAREHPETIAN G.B.,ABEDI M.
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

SINCE POWER TRANSFORMERS ARE ONE OF THE MOST IMPORTANT COMPONENTS OF ANY POWER SYSTEM, THEIR RELIABILITY HAD CRUCIAL IMPORTANT FOR THE SYSTEM OPERATION. MOST SERIOUS FAILURE OF A LARGE POWER TRANSFORMER IS DUE TO THE INSULATION BREAKDOWN. PARTIAL DISCHARGE (PD) THAT DAMAGE INSULATION BY GRADUAL EROSION IS A MAJOR SOURCE OF INSULATION FAILURE. TECHNIQUES FOR LOCATING A PD SOURCE ARE OF IMPORTANCE IN TRANSFORMER MAINTENANCE AND REPAIR, HOWEVER ACCURATE PD LOCATION IS DIFFICULT DUE TO COMPLEX STRUCTURE OF A TRANSFORMER BUT DETECTING PD SOURCE APPROXIMATELY CAN REDUCE REPAIR TIME AND COST.
THE LOCATING METHOD OF PD CAN BE MAINLY CATEGORIZED INTO TECHNIQUES BASED ON ACOUSTIC SIGNALS OR ELECTRICAL SIGNALS. THE ADVANTAGE OF ACOUSTIC LOCATING METHOD IS ITS SIMPLE ALGORITHM AND NOISE-PROOF FEATURE, BUT ITS SENSITIVITY IS VERY LOW, AND THE CONSTRUCTION OF TRANSFORMER IS TOO COMPLEX TO FIND THE SPEED OF ULTRASONIC WAVE CAUSED BY PD. THE ELECTRICAL METHOD HAS A BETTER SENSITIVITY BECAUSE IT DEPENDS ON PULSE CURRENT SIGNALS MEASURED AT TRANSFORMER TERMINAL.
IN THIS PAPER TO LOCATE PARTIAL DISCHARGE SOURCE, THE PROPAGATING PRINCIPLE OF PD PULSE ALONG TRANSFORMER WINDINGS AND THE RESPONSE OF PD PULSE AT DETECTING TERMINALS (OUTSIDE THE TRANSFORMER) ARE STUDIED. THE PARTIAL DISCHARGE IN THE INSULATION BETWEEN EACH COIL AND GROUND IS MODELED AND SIMULATED BY EMTP. THEN THE SIGNALS OF NEUTRAL POINT AND TOP POINT OF WINDING ARE STUDIED WHEN PD PULSE IS INJECTED AT DIFFERENT WINDING DISK. USING THE PARSEVAL’S THEOREM AND MATLAB, ENERGY OF SIGNALS ARE DETERMINED. IT IS SHOWN THAT THE ENERGY OF SIGNALS CAN BE USED AS AN INDEX FOR PD DETECTION AND LOCATING.

 
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