外文翻译基于LabVIEW电流互感器校验仪.docxVIP

附录A LabVIEW Based Instrument Current Transformer CalibratorXinAi Hal BaoY.H. Song 1) NorthChinaElectricPowerUniversity, Beijing, China 107206 2)BrunelUniversity.UKABSTRACTThe Virtual Instrument (VI) mainly refers to build all kinds of instruments by software such as LabVIEW,which likes a real instrument buildin a computer. Its main characteristicsare flexibility, multi-functions, multiple uses for one PC computer, giving high performance, and is less costly. In this paper, the VI technology is applied to the test and measurement of instrument current transformer (TA). By using the LabVIEW, the TA accuracy calibrator was developed. This virtual T.4 calibrator can automatically measure the accuracy of T.4 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.Keywords：Instrument current transformer (TA), TA calibrator, Virtual Instruments, LabVIEW.I. INTRODUCTIONSince 1992 the VXIbus Rev.1.4standard was established by the United States and LabVIEW was presented by the National Instruments co.(Nl), the Virtual Instrument (VI) have lain the foundation for its commercial use. The main characteristic of Virtual Instrument is that it makes instruments by software. Most of the traditional instrument can be developed by VI. The VI is a real instrument made by the personal computer.The Instrument current transformer (TA) is widely used in all kinds of current measurement and it has the functions of protection, isolation and extending the measuring range. With the rapid development of computer measurement and control technology, and with the sequent emergence of current transformer and transducer, there is an increasing number of current transformers with high accuracy and low secondary current. The standard TA secondary current is usually 1A or 5A: some non-standard TA secondary current may be 0 1A or lowe