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Paper Information

Title: 

TEMPERATURE EFFECT ON PD PULSE DISTRIBUTIONS OF HV GENERATORS' STATOR BARS WITH SURFACE INSULATION DEFECTS

Type: PAPER
Author(s): RAFIEE M.,SHAYANFAR H.A.
 
 
 
Name of Seminar: INTERNATIONAL POWER SYSTEM CONFRENCE
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVANIR
Date:  2004Volume 19
 
 
Abstract: 

TEMPERATURE CAN AFFECT PD ACTIVITY OF HV GENERATORS STATOR BARS. FOR A NEW INSULATION SYSTEM THIS EFFECT IS VERY LOW BUT FOR SEVERAL DEFECTS SUCH AS DELAMINATION, TEMPERATURE HAS A DECREASING EFFECT AND FOR SOME OTHERS SUCH AS SEMI-CONDUCTING PAINT AND ANTI-CORONA COVERAGE DEFECT TEMPERATURE HAS AN INCREASING EFFECT ON PD ACTIVITY.
IN THIS RESEARCH PD ACTIVITY OF SOME REAL HYDRO-GENERATOR STATOR BARS WERE MEASURED AND ANALYZED TO EVALUATE THE POSSIBILITY OF USING TEMPERATURE EFFECT FOR PD PATTERN CLASSIFICATION. FOR THIS PURPOSE, DEFECTS HAVE BEEN MADE ARTIFICIALLY ON CONDUCTING PAINT AND SEMI-CONDUCTING PAINT ON "IN THE SLOT" AND "OUT OF THE SLOT" PART OF STATOR BARS RESPECTIVELY. PD HAS BEEN MEASURED IN THREE DIFFERENT TEMPERATURES AT NOMINAL VOLTAGE FOR EACH OF THESE DEFECTS. AFTER REPAIRING OF THESE DEFECTS PD HAS BEEN MEASURED AGAIN AND RESULTS HAVE BEEN ANALYZED. STATOR BARS TEMPERATURE RAISED BY INJECTING HIGH CURRENT USING A HCT TRANSFORMER. SKEWNESS, KURTOSIS AND CROSS-CORRELATION OF PHASE RESOLVED AND AMPLITUDE PD DISTRIBUTIONS WERE CALCULATED AND ANALYZED WHICH SHOW THE SHAPE OF THESE DISTRIBUTIONS IS AFFECTED BY TEMPERATURE. THUS WE CONCLUDE THAT MEASURING PD AT DIFFERENT TEMPERATURES CAN PROVIDE MORE INFORMATION ABOUT INSULATION DEFECT TYPES AND THIS DATA CAN BE USED FOR TRAINING OF PD CLASSIFICATION INTELLIGENT SYSTEMS.

 
Keyword(s): PD MEASUREMENT, TEMPERATURE EFFECT, FEATURE EXTRACTION, STATOR BAR
 
 
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