SN EN 61881 : 1999

1 General
      1.1 Scope and object
      1.2 Normative references
      1.3 Definitions
      1.4 Service conditions
2 Quality requirements and tests
      2.1 Test requirements
      2.2 Classification of tests
      2.3 Capacitance and tan d measurements (routine
             test)
      2.4 Capacitor loss tangent (tan d) measurement
             (type test)
      2.5 Voltage test between terminals
      2.6 AC voltage test between terminals and case
      2.7 Test of internal discharge device
      2.8 Sealing test
      2.9 Surge discharge test
      2.10 Thermal stability test
      2.11 Self-healing test
      2.12 Resonance frequency measurement
      2.13 Environmental testing
      2.14 Mechanical testing
      2.15 Endurance test
      2.16 Destruction test
      2.17 Disconnecting test on fuses
3 Overloads
      3.1 Maximum permissible voltage
4 Safety requirements
      4.1 Discharge device
      4.2 Case connections
      4.3 Protection of the environment
      4.4 Other safety requirements
5 Markings
      5.1 Marking of the units
6 Guide to installation and operation
      6.1 General
      6.2 Choice of rated voltage
      6.3 Operating temperature
      6.4 Special service conditions
      6.5 Overvoltages
      6.6 Overload currents
      6.7 Switching and protective devices
      6.8 Choice of creepage distance and clearance
      6.9 Connections
      6.10 Parallel connections of capacitors
      6.11 Series connections of capacitors
      6.12 Magnetic losses and eddy currents
      6.13 Guide for fuse and disconnector protection
Annex A (informative) Waveforms
Annex B (normative) Operational limits of capacitors with
                    sinusoidal voltages as a function of
                    frequency and at maximum temperature
                    (qmax)
Annex C (normative) Resonance frequency measuring methods
                    - Examples
Annex D (informative) Bibliography
Figure 1 - Destruction test arrangement
Figure 2 - N source d.c. plus a.c.
Figure 3 - N source d.c.
Figure A.1 - Example of current pulse width
Figure B.1 - Supply conditions
Figure C.1 - Measuring circuit
Figure C.2 - Relation between the voltage across the
             capacitor and the supply frequency
Figure C.3 - Discharge current wave shape
Table 1 - Maximum temperature of cooling medium for unlimited
          time
Table 2 - Test voltage between terminals
Table 3 - Damp heat test
Table 4 - Testing the robustness of terminals
Table 5 - Example of current-carrying capacities of screw
          terminals and bolts
Table 6 - Endurance test
Table 7 - Maximum permissible voltage
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

Applicable to capacitors for power electronics for use on rolling stock - limited to 10 000 V, and distinguishes between d.c. and a.c. capacitors.