FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Rating
   4.1 Rated voltages
   4.2 Insulation levels
   4.3 Rated currents
   4.4 Minimum nominal creepage distance
5 Operating conditions
   5.1 General
   5.2 Factors affecting the design, testing and application
6 General requirements
   6.1 List of variables
   6.2 Nameplate markings
7 Test requirements
   7.1 General requirements
   7.2 Test classification
8 Type tests
   8.1 Dry power-frequency voltage withstand test with partial
        discharge measurement
   8.2 Dry lightning impulse voltage withstand test (BIL)
   8.3 Dry or wet switching impulse voltage withstand test (SIL)
   8.4 Temperature rise test
   8.5 Cantilever load withstand test
   8.6 Tightness test on liquid-filled, compound-filled and
        liquid-insulated bushings
   8.7 Internal pressure test on gas-filled, gas-insulated and
        gas-impregnated bushings
   8.8 Verification of dimensions
9 Routine tests
   9.1 Measurement of dielectric dissipation factor (tan d) and
        capacitances
   9.2 Dry lightning impulse voltage withstand test (BIL)
   9.3 Dry power-frequency voltage withstand test with partial
        discharge measurement
   9.4 DC applied voltage withstand test with partial discharge
        measurement
   9.5 Polarity reversal test with partial discharge measurement
   9.6 Test of tap insulation
   9.7 Internal pressure test on gas-filled, gas-insulated and
        gas-impregnated bushings
   9.8 Tightness test on liquid-filled, compound-filled and
        liquid-insulated bushings
   9.9 Tightness test on gas-filled, gas-insulated and
        gas-impregnated bushings
   9.10 Tightness test at the flange or other fixing device
   9.11 Visual inspection and dimensional check
10 Special tests
   10.1 Artificial pollution test
   10.2 Even wetting d.c. voltage test
   10.3 Uneven wetting d.c. voltage test
Bibliography
Figure 1 - Polarity reversal test profile
Table 1 - Minimum values of cantilever withstand load