NBN EN 60137 : 2010

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Ratings
   4.1 Standard values of highest voltage for equipment (U[m])
   4.2 Standard values of rated current (I[r])
   4.3 Standard values of rated thermal short-time current
        (I[th])
   4.4 Standard values of rated dynamic current (I[d])
   4.5 Minimum withstand values of cantilever load
   4.6 Angle of mounting
   4.7 Minimum nominal creepage distance
   4.8 Temperature limits and temperature rise
   4.9 Standard insulation levels
   4.10 Test tap on transformer bushings
5 Operating conditions
   5.1 Temporary overvoltages
   5.2 Altitude
   5.3 Temperature of ambient air and immersion media
   5.4 Seismic conditions
6 Ordering information and markings
   6.1 Enumeration of characteristics
   6.2 Markings
7 Test requirements
   7.1 General requirements
   7.2 Test classification
   7.3 Condition of bushings during dielectric and thermal
        tests
8 Type tests
   8.1 Dry or wet power-frequency voltage withstand test
   8.2 Dry lightning impulse voltage withstand test (BIL)
   8.3 Dry or wet switching impulse voltage withstand test
        (SIL)
   8.4 Thermal stability test
   8.5 Temperature rise test
   8.6 Verification of thermal short-time current withstand
   8.7 Cantilever load withstand test
   8.8 Tightness test on liquid-filled, compound-filled and
        liquid-insulated bushings
   8.9 Internal pressure test on gas-filled, gas-insulated
        and gas-impregnated bushings
   8.10 External pressure test on partly or completely
        gas-immersed bushings
   8.11 Verification of dimensions
9 Routine tests
   9.1 Measurement of dielectric dissipation factor (tan delta)
        and capacitance at ambient temperature
   9.2 Dry lightning impulse voltage withstand test (BIL)
   9.3 Dry power-frequency voltage withstand test
   9.4 Measurement of partial discharge quantity
   9.5 Tests of tap insulation
   9.6 Internal pressure test on gas-filled, gas-insulated
        and gas-impregnated bushings
   9.7 Tightness test on liquid-filled, compound-filled and
        liquid-insulated bushings
   9.8 Tightness test on gas-filled, gas-insulated and
        gas-impregnated bushings
   9.9 Tightness test at the flange or other fixing device
   9.10 Visual inspection and dimensional check
10 Requirements and tests for bushings of highest voltages for
   equipment equal to or less than 52 kV made of ceramic, glass
   or inorganic materials, resin or combined insulation
   10.1 Temperature requirements
   10.2 Level of immersion medium
   10.3 Markings
   10.4 Test requirements
Annex ZA (normative) Normative references to international
    publications with their corresponding European publications
Bibliography

Specifies characteristics and tests for insulated bushings. Applies to bushings intended for use in electrical apparatus, machinery, transformers, switchgear and installations for three-phase alternating current systems, with rated voltages above 1000 V and power-frequencies of 15 Hz up to and including 60 Hz.