Instrument transformers - Additional requirements for inductive voltage transformers Ingestion-build-177197 and test methods for cokes

and test methods for cokes at producers’ works

and performance of plastics pipes of up to 400 mm nominal outside diameter

ISO 5628 specifies three test methods for determining the bending stiffness of paper and paperboard

in order to provide the lighting performance needed for safe movement of people in the event of the supply to normal lighting failing

4 Description

Instrument transformers - Additional requirements for inductive voltage transformers Ingestion-build-177197 and test methods for cokes1 Scope This part of IEC 61869 applies to new inductive voltage transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz. NOTE 301 Requirements specific to three phase voltage transformers are not included in this standard but, so far as they are relevant, the requirements in clauses 4 to 10 apply to these transformers and a few references to them are included in those clauses (e.