BS 3938:1973 - Specification for current transformers

BS 3938:1973

Specification for current transformers

Status : Superseded, Withdrawn   Published : February 1973 Replaced By : BS 7626:1993

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Current transformers for frequencies 14 Hz to 100 Hz for use with electrical measuring instruments and electrical protective devices. Ratings; accuracy; tests; rating-plate and terminal markings. Appendices on guidance in application of current transformers: short-time rating; maximum V A output of bar-primary and bushing current transformers; use of current transformers for dual purpose of measurement and protection, composite error, high and low reactance current transformers.

Standard NumberBS 3938:1973
TitleSpecification for current transformers
StatusSuperseded, Withdrawn
Publication Date02 February 1973
Confirm Date15 August 1992
Withdrawn Date01 November 2003
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Replaced ByBS 7626:1993
Draft Superseded By71/24274 DC
DescriptorsAlternating-current transformers, Current transformers, Electrical measuring instruments, Protective relays, Instrument transformers, Environment (working), Ratings, Performance, Rated current, Rated power, Power output, Temperature-rise limit, Windings, Electrical insulation, Rated voltage, Impulse voltages, Withstand voltage, Leakage paths, Overvoltage tests, High-voltage tests, Commissioning, Marking, Electric terminals, Name plates, Accuracy, Temperature measurement, Type testing, Transformers
Title in FrenchTransformateurs de courant. Specification
Title in GermanStromwandler. Spezifikation
ISBN0 580 07309 2
File Size689.3 KB
NotesThis standard remained current until recently because it dealt with 'Class X' transformers. BS EN 60044-1:1999 (including amendments A1:2000 and A2:2003) deals with the 'Class PX' specification for transformers, which completely replaces Claxx X. Hence this standard has now been withdrawn.

*To ask about withdrawn titles contact the
Customer Relations, +44 345 086 9001
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