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INSTRUMENT TRANSFORMERS - PART 3: COMBINED TRANSFORMERS
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Superseded date: 01-04-2015
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Published date: 12-01-2013
Publisher: Verband Deutscher Elektrotechniker
FOREWORD1 Scope and object2 Definitions3 Normal and special service conditions4 Ratings 4.1 General 4.2 Limits of temperature rise5 Design requirements 5.1 General 5.2 Transmitted overvoltages6 Tests 6.1 Classification of tests 6.2 Type tests 6.3 Routine tests 6.4 Special tests7 Type tests 7.1 General 7.2 Temperature-rise test 7.3 Impulse tests on primary windings8 Routine tests 8.1 General 8.2 Power-frequency withstand test on the primary windling9 Special tests 9.1 General 9.2 Measurement of capacitance and dielectric dissipation factor 9.3 Transmitted overvoltage measurement10 Marking 10.1 Rating plate marking 10.2 Terminal marking11 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 transformersAnnex 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.
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