Accuracy class tells the percentage error of an equipment.
For example, an Accuracy Class 1.0 CT means the error will be +/- 1 %. That means, say, you have a 100/5A CT and when you pass 100A through the primary of this CT, the secondary current can be anywhere between 4.95A to 5.05A.
The accuracy class stating the limits of permissible error is expressed as a percentage of the span.
The following accuracy classes are defined: 0.1, 0.25, 0.6, 1,1.6, 2.5 and 4.
Accuracy class Limits of permissible error (percentage of span)
0.1 ± 0.1 %
0.25 ± 0.25 %
0.6 ± 0.6 %
1 ± 1 %
1.6 ± 1.6 %
2.5 ± 2.5 %
4 ± 4 %
For example, an Accuracy Class 1.0 CT means the error will be +/- 1 %. That means, say, you have a 100/5A CT and when you pass 100A through the primary of this CT, the secondary current can be anywhere between 4.95A to 5.05A.
The accuracy class stating the limits of permissible error is expressed as a percentage of the span.
The following accuracy classes are defined: 0.1, 0.25, 0.6, 1,1.6, 2.5 and 4.
Accuracy class Limits of permissible error (percentage of span)
0.1 ± 0.1 %
0.25 ± 0.25 %
0.6 ± 0.6 %
1 ± 1 %
1.6 ± 1.6 %
2.5 ± 2.5 %
4 ± 4 %
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