This part of IEC 60044 applies to newly manufactured electronic current transformers having
an analogue voltage output or a digital output, for use with electrical measuring instruments
and electrical protective devices at nominal frequencies from 15 Hz to 100 Hz.
NOTE Additional requirements due to the bandwidth are considered. The accuracy requirements on harmonics are
given in annex D.
Clause 12 covers the accuracy requirements that are necessary for electronic current
transformers for use with electrical measuring instruments.
Clause 13 covers the accuracy requirements that are necessary for electronic current
transformers for use with electrical protective relays, and particularly for forms of protection in
which the prime requirement is to maintain the accuracy up to several times the rated current.
If required, the transient accuracy of an electronic current transformer during fault is also given
in this clause.
Electronic current transformers intended for both measurement and protection should comply
with all the clauses of this standard and are called multipurpose electronic current
transformers.
The transformer technology can be based on optical arrangements equipped with electrical
components, on air-core coils (with or without a built-in integrator), or on iron-core coils with
integrated shunt used as a current-to-voltage converter, alone or equipped with electronic
components.
For analogue output, the electronic current transformer may include the secondary signal
cable. Examples of electronic current transformer technologies using air-core coils and ironcore
coils with integrated shunt are given in annex C.
For digital output, this standard takes into account a point-to-point connection from the
electronic transformer to electrical measuring instruments and electrical devices (see annex B).
Some information has been added in order to ensure the compatibility of this point-to-point link
with the overall system of communication in the substation, thus allowing data exchange
between all kinds of substation devices. This information builds what is called the mapping of
the link layer of the point-to-point serial link. Processbus communication is under
consideration.
This mapping allows interoperability between devices from different manufacturers.
This standard does not specify individual implementations or products, nor does it constrain the
implementation of entities and interfaces within a computer system. This standard specifies the
externally visible functionality of implementations together with conformance requirements for
such functionalities.
BS EN 60044-8:2002 history
2017BS EN 61869-6:2016 Instrument transformers. Additional general requirements for low-power instrument transformers
2002BS EN 60044-8:2002 Instrument transformers - Electronic current transformers