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CENELEC - EN 60044-1

Instrument Transformers - Part 1: Current Transformers

inactive, Most Current
Organization: CENELEC
Publication Date: 1 August 1999
Status: inactive
Page Count: 50
ICS Code (Measurement of electrical and magnetic quantities): 17.220.20
scope:

This part of IEC 60044 applies to newly manufactured current transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz.

Although the requirements relate basically to transformers with separate windings, they are also applicable, where appropriate, to autotransformers.

Clause 11 covers the requirements and tests, in addition to those in Clauses 3, 4, 5, 6, 7, 8, 9 and 10, that are necessary for current transformers for use with electrical measuring instruments.

Clause 12 covers the requirements and tests, in addition to those in Clauses 3, 4, 5, 6, 7, 8, 9 and 10, that are necessary for current transformers for use with electrical protective relays, and in particular for forms of protection in which the prime requirement is the maintenance of accuracy up to several times the rated current.

For certain protective systems, where the current transformer characteristics are dependant on the overall design of the protective equipment (for example, high-speed balanced systems and earth-fault protection in resonant earthed networks), additional requirements are given in Clause 13 for class PR transformers and in Clause 14 for class PX transformers.

Clause 13 covers the requirements and tests in addition to those in Clause 3, 4, 5, 6, 7, 8, 9 and 10 that are necessary for current transformers for use with electrical protective relays, and in particular for forms of protection in which the prime requirement is the absence of remanent flux.

Clause 14 covers the requirements and tests in addition to those in Clauses 3, 4, 5, 6, 7, 8, 9 and 10 that are necessary for current transformers for use with electrical protective relays, and in particular for forms of protection for which knowledge of the transformer's secondary excitation characteristic, secondary winding resistance, secondary burden resistance and turns ratio is sufficient to assess its performance in relation to the protective relay system with which it is to be used.

Current transformers intended for both measurement and protection shall comply with all the clauses of this standard.

Instrument transformers (ITs) are considered to be passive elements.

NOTE For outdoor ITs having voltages U123 kV the RIV measurements are suitable to cover the requirements of EMC Directive. For guidance of the test procedure EN 60694:1996, § 6.3 might be followed.

Document History

EN 60044-1
August 1, 1999
Instrument Transformers - Part 1: Current Transformers
This part of IEC 60044 applies to newly manufactured current transformers for use with electrical measuring instruments and electrical protective devices at frequencies from 15 Hz to 100 Hz....
August 1, 1999
Instrument Transformers Part 1: Current Transformers
A description is not available for this item.
August 1, 1999
Instrument Transformers - Part 1: Current Transformers
A description is not available for this item.

References

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