BS EN 50152-3-2:2016 is applicable to new current transformers which are:

• intended for use in indoor or outdoor fixed installations in tractions systems, and
• operated with an a.c. line voltage and frequency as specified in EN 50163.

NOTE 1 EN 50163 specifies the a.c. traction systems 15 kV 16,7 Hz and 25 kV 50 Hz. NOTE 2 As rails of a.c. traction systems are typically connected to earth and included in the return current path, all phase to earth voltages are subject to the limits as given in BS EN 50163. Nevertheless conductor to conductor voltages are some times higher e.g. in autotransformer systems.

Current transformers are mainly used with:

• measuring instruments,
• protective devices.

This BS EN 50152-3-2 also applies to current transformers other than inductive types as far as reasonably possible. Requirements of this EN 50152-3-2 have priority.

NOTE 3 Combined current and voltage transformers are typically not used in fixed installations in traction systems.


Cross References:
EN 50121-5:2006
EN 50124-1:2001
EN 50125-2:2002
EN 50152
EN 50163:2004
EN 61869-1:2009
IEC 61869-1:2007
EN 61869-2:2012
IEC 61869-2:2012
EN 50119:2009
EN 50121
EN 50122-1:2011
EN 50124-2:2001
EN 50126
EN 60060-1
IEC 60060-1
EN 60068
IEC 60068
EN 60137:2008
IEC 60137:2008
EN 60270:2001
IEC 60270:2000
EN 60507:2014
IEC 60507:2013
EN 60721
IEC 60721
EN 61000
IEC 61000
IEC 60050-151
IEC 60050-441
IEC 60050-446
IEC 60050-604
IEC 60050-605:1983
IEC 60050-811:1991
IEC/TS 60815
IEC/TR 61869-100:2015


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