IEC 61330:1995

FOREWORD
INTRODUCTION
1 General
      1.1 Scope
      1.2 Normative references
      1.3 Definitions
2 Service conditions
      2.1 Normal service conditions
      2.2 Special service conditions
3 Requirements for components
4 Ratings
      4.1 Rated voltages
      4.2 Rated insulation levels
      4.3 Rated frequency and number of phases
      4.4 Rated normal currents and temperature rise
      4.5 Rated short-time withstand currents
      4.6 Rated peak withstand currents
      4.7 Rated duration of short circuit
      4.8 Rated supply voltage of operating devices and
             auxiliary circuits
      4.9 Rated supply frequency of operating devices and
             auxiliary circuits
      4.10 Rated maximum power of the prefabricated
             substation
      4.11 Rated class of enclosure
5 Designation and construction
      5.1 Earthing
      5.2 Auxiliary equipment
      5.3 Nameplate
      5.4 Degree of protection and internal fault
      5.5 Enclosure
      5.6 Sound emission
6 Type tests
      6.1 Dielectric tests
      6.2 Temperature-rise tests
      6.3 Short-time and peak withstand current tests on
             earthing circuits
      6.4 Functional tests
      6.5 Verification of the degree of protection
      6.6 Mechanical tests
7 Routine tests
      7.1 Voltage withstand tests on auxiliary circuits
      7.2 Functional tests
      7.3 Verification of correct wiring
      7.4 Tests after assembly on site
8 Guide to the selection of prefabricated substations
      for service
9 Information to be given with enquiries, tenders and
      orders
      9.1 Information with enquiries and orders
      9.2 Information with tenders
10 Rules for transport, erection, operation and
      maintenance
      10.1 Conditions during transport, storage and
             erection
      10.2 Erection
      10.3 Operation
      10.4 Maintenance
Annex A - Method for testing the prefabricated substation
          under conditions of arcing due to an internal fault
Annex B - Test to verify the sound level of a prefabricated
          substation
Annex C - Mechanical impact test
Annex D - Rating of transformers in an enclosure

Specifies the service conditions, rated characteristics, general structural requirements and test method of prefabricated substations, which are cable connected, for alternating current of primary rated voltages above 1 kV and up to and including 52 kV1, and for a transformer of maximum power 1 600 kVA, for service frequencies up to and including 60 Hz.