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POTENTIAL TRANSFORMERS CLASS OF ACCURACY
I.S. 4146-1983 -Applications guide for voltage transformer’ has recommended the following accuracy classes for various applications.
| Applications | Class of Accuracy (See Table 1 of IS: 3156 (Part 2) - 1992 |
| For precision testing or as substandard for testing laboratory voltage transformers. | 0.1 |
| For laboratory and test work in conjunction with high accuracy indicating instruments, integrating meters and also for substandard for testing industrial voltage transformers. | 0.2 |
| For precision industrial metering and for use with substandard indicating wattmeter's. | 0.5 or 1.0 |
| For commercial and industrial metering and for use with indicating and graphic wattmeter's and voltmeters. | 1.0 |
| For purposes where the phase angle is of less importance, for example, voltmeters. | 3.0 |
It is recommended that the accuracy class should be correctly selected along with correctly determined burden so that the P.Ts can be procured at reasonable price.