A LabVIEW based instrument current transformer calibrator

The virtual instrument (VI) mainly refers to building all kinds of instruments by software such as LabVIEW, which is like a real instrument build in a computer. Its main characteristics are flexibility, multi-functions, multiple uses for one PC computer, high performance, and less cost. In this paper., the VI technology is applied to the test and measurement of the instrument current transformer (TA). By using LabVIEW, a TA accuracy calibrator was developed. This virtual TA calibrator can automatically measure the accuracy of TA and can indicate the ratio error and phase error curves. The tests and calibration for the TA show that the virtual TA calibrator can be used in place of the traditional calibrator and is much better than the traditional one.