BS EN 60044-3:2003

FOREWORD
1 Scope and object
2 Definitions
3 Normal and special service conditions
4 Ratings
   4.1 General
   4.2 Limits of temperature rise
5 Design requirements
   5.1 General
   5.2 Transmitted overvoltages
6 Tests
   6.1 Classification of tests
   6.2 Type tests
   6.3 Routine tests
   6.4 Special tests
7 Type tests
   7.1 General
   7.2 Temperature-rise test
   7.3 Impulse tests on primary windings
8 Routine tests
   8.1 General
   8.2 Power-frequency withstand test on the primary
        windling
9 Special tests
   9.1 General
   9.2 Measurement of capacitance and dielectric
        dissipation factor
   9.3 Transmitted overvoltage measurement
10 Marking
   10.1 Rating plate marking
   10.2 Terminal marking
11 Additional requirements for measuring and protective
   combined transformer
   11.1 General
   11.2 Mutual influence
   11.3 Type test for accuracy of measuring and protective
        combined transformer
   11.4 Routine accuracy tests for measuring and protective
        combined transformers
Annex A (informative) The mutual influence of current and
        voltage transformers

Defines requirements, in addition to those given in EN 60185 and 60186, for transformers with combined voltage and current in the same casing.

This part of IEC 60044 applies to newly manufactured combined transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz. The requirements and tests of this standard, in addition to the requirements and tests of IEC 60044-1, IEC 60044-2 and IEC 60044-5 cover current, voltage and capacitor voltage transformers, that are necessary for combined instrument transformers. This standard shall be used in conjunction with IEC 60044-1 and IEC 60044-2.