Electrical Supplies
Current transformer T1
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- Current transformers (CT) from 40A to 6000A CT current transformers for symmetrical DIN rail, on mounting plate, or on busbar.
Application
Step the main or feeder current down to a 5 A or 1 A secondary so that meters, power monitors and protection relays can be connected without carrying full load current. Split-core versions clip around an existing busbar or cable for retrofit metering without shutting the board down
accuracy class is selected to suit billing or protection duty.
Standards & Reference 4 cited
IEC 61869-1
General requirements for instrument transformers: the base standard behind current and voltage transformer ratings.
IEC 61869-2
Additional requirements for current transformers: accuracy class, burden and the rated values a protection or metering CT is selected on.
IEC 60044-1
The earlier current transformer standard, superseded by IEC 61869-2 but still cited on established product ranges.
IEC 61010-1
Safety requirements for electrical equipment used for measurement, control and laboratory use, which is where the CAT measurement categories come from.
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