ENA TS 35-17 : ISSUE 1 1996

Foreword
1. Scope
2. References
3. Definitions.
    3.1 Class PX current transformer
    3.2 Specified knee point e.m.f. (Ek)
    3.3 Nominal turns ratio
4. Performance Requirements
    4.1 Specification of performance
5. Insulation Requirements
    5.1 Insulation requirements for secondary winding
    5.2 Interturn insulation requirements
6. Type and Routine Tests
    6.1 Type test
    6.2 Routine tests
7. Marking
    7.1 Marking on the rating plate of a Class PX
         current transformer

Gives requirements additionally to BS 7626 for low-reactance current transformers that are designated Class PX, for use with protective systems at various system voltage levels. In relation to requirements for specification and testing, it indicates the differences between Class PX current transformers and those that are specified in BS 7626.