Determination of threshold and maximum operating electric stresses for selected high voltage insulations: Investigation of aged polymeric dielectric cable. Final report Page: 3 of 100

                                
DETERMINATION OF THRESHOLD AND MAXIMUM
OPERATING ELECTRIC STRESSES FOR
SELECTED HIGH VOLTAGE INSULATIONS
Investigation of Aged Polymeric Dielectric Cable
TABLE OF CONTENTS
Item                                                         Page
ABSTRACT
1.0       INTRODUCTION                                        1
2.0       DESCRIPTION OF TEST CABLES                          3
3..0      TEMPERATURE CONDITIONING OF TEST CABLES             5
4.0       TESTING OF XLPE INSULATED CABLE BEFORE AGING        7
4.1       Threshold Voltage Test                              7
4.2       Measurement of Threshold Voltage Stress on XLPE
Model Cable Before Aging                           15
4.3       Measurement of A.C. Voltage Breakdown of XLPE
Model Cable Before Aging                           24
4.4       Measurement of Threshold Voltage Stress of XLPE
15 kV Cable Before Aging                           24
4.5       Measurement of A.C. Voltage Breakdown of XLPE
15 kV Cable Before Aging                           31
5.0       AGING OF XLPE CABLES                               31
6.0       DRYING OF AGED MODEL XLPE CABLE                    34
7.0       TESTING OF AGED XLPE CABLES                        34
7.1       Measurement of Threshold Voltage Stress of Aged
XLPE Model Cable                                   35
7.1.1     Measurement of Threshold Voltage Stress of Aged
Then Dried XLPE Model Cable                        47
7.2       Measurement of A.C. Voltage Breakdown of Aged
XLPE Model Cable                                   54
7.2.1     Measurement of A.C. Voltage Breakdown of Aged
XLPE Model Cable After Drying                      54
7.3       Measurement of Threshold Voltage Stress of Aged
XLPE 15 kV Cable                                   63