Micro Current Transformers

KEY PERFORMANCE INDEX:

Rated Insulation Level

Power-Frequency Withstand Voltage

The power-frequency withstand voltage between primary winding to secondary winding and to the ground shall be 3kV (r.m.s). When Class II protective insulation is specified, it shall be 4kV (r.m.s). By using dielectric strength tester to perform the test under rated 3kV/4kV voltage, leakage current 1mA for 1 minute, no breakdown from current transformer is allowed.

Insulation Resistance

The insulation resistance of the primary winding to the secondary winding and to the ground should be larger than 500MΩ.

Polarity

The polarity of current transformer is subtractive. When primary is energized from terminal L1 to terminal L2, the induced secondary current flow is from terminal K1 via burden circuit to terminal K2.

Errors

Current Error (Ratio Error)

The error which a transformer introduces into the measurement of a current and which arises from the fact that the actual transformation ratio is not equal to the rated transformation ratio.

Phase Displacement

The difference in phase between the primary and secondary current vectors, the direction of the

phasors being so chosen that the angle is zero for an ideal transformer.

The phase displacement is said to be positive when the secondary current phasor leads the primary current phasors. It is usually expressed in minutes（’） or centiradians（Crad.）

Rated Transformation Ratio

Ratio of the rated primary voltage or current to the rated secondary voltage or current.

Accuracy Class

A designation assigned to an instrument transformer, the ratio error and phase displacement of which remain within specified limits under prescribed conditions of use.

Error Limits

CT (Current Transformer) Error Limits

Note:

1) Between the current 0.2In and Imax, we take the mean value of the maximum phase displacement and the minimum phase displacement as , take the difference between the phase displacement of current i and the mean value as the phase error of current i ：

2) The actual error curve of the current transformer should not exceed the range of the line formed by the error limit line of Table 1.

3) 0.02 class and above , current transformer is according to the definition of JJG 314-2010.

PT (Potential Transformer) Error Limit

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