Nomenclature of
CT:
·
Ratio: input
/ output current ratio
·
Burden (VA): total
burden including pilot wires. (2.5,
5, 10, 15 and 30VA.)
·
Class: Accuracy
required for operation (Metering: 0.2,
0.5, 1 or 3, Protection: 5, 10, 15, 20, 30).
·
Accuracy Limit
Factor:
·
Nomenclature of CT: Ratio, VA Burden, Accuracy
Class, Accuracy Limit Factor.
·
Example: 1600/5, 15VA 5P10 (Ratio: 1600/5, Burden: 15VA, Accuracy Class: 5P,
ALF: 10)
·
As per IEEE
Metering CT: 0.3B0.1 rated Metering CT is accurate to 0.3
percent if the connected secondary burden if impedance does not exceed 0.1
ohms.
·
As per IEEE
Relaying (Protection) CT: 2.5C100 Relaying CT is
accurate within 2.5 percent if the secondary burden is less than 1.0 ohm (100
volts/100A).
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