Electronic transformer performance evaluation and its impact on PMU. Issue 23 (7th November 2019)

• Record Type: Journal Article
• Authors: Li, Jue; Liu, Hao; Martin, Kenneth E.; Li, Jinsong; Bi, Tianshu; Yang, Qixun
• Is Part Of: IET generation, transmission & distribution. Volume 13:Issue 23(2019)
• Page Start: 5396
• Page End: 5403
• Publication Date: 2019-11-07
• Subjects: phasor measurement -- measurement errors -- current transformers -- transducers -- voltage measurement -- performance evaluation -- electric sensing devices -- frequency measurement -- power system harmonics -- phase measurement; electronic transformer performance evaluation -- PMU -- smart substations -- transformation characteristics -- Rogowski electronic current transformer -- ECT -- electronic voltage transducer -- EVT -- phasor measurement unit -- standard test signals -- measurement errors -- ROCOF measurements -- rate of the change of the frequency measurements -- PT; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.0174
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : The electronic transformer of smart substations, which transfers primary signals, is important for measurements and controls. In this study, the transformation characteristics of a Rogowski electronic current transformer (ECT) are analysed theoretically. Then, experimental platforms are established to verify the analysis and study the impact of the transformation characteristics of the ECT and an electronic voltage transformer (EVT) on a phasor measurement unit (PMU) using standard test signals. The analysis and the testing results show that this ECT can transfer the phasor well under both steady and dynamic conditions. However, the harmonics introduced by the ECT may lead to the measurement errors of frequency and the rate of the change of the frequency (ROCOF) from the PMU. Therefore, a phasor algorithm with powerful DC offset and harmonics immunity is suggested for PMUs connected to the output of this type of ECT. For the EVT, the ROCOF measurements are easily affected as well. The EVT was also shown to be more sensitive to temperature than the potential transformer (PT).