Error analysis of electronic instrument transformers

Peng Wang, Guixin Zhang, Lianzi Li, Xiaomei Zhu, Chengmu Luo

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The system error characteristics are analyzed to improve the measurement accuracy of electronic instrument transformers. The noise characteristics of the electronic instrument transformers are related to the error characteristics of front-amplifiers, A/D converters, and signal processing units on the low-voltage side. The analysis identifies the key factors influencing the system measurement accuracy. Criteria are then developed for component selection and system design of the transformers with a 220 kV electronic current transformer developed and tested. The results show that the current transformer meets the IEC 0.2 class accuracy requirements, has a ratio the range of error of less than ± 0.1% and a phase error of less than ± 2′ at the range of -30°C to +70°C.

Original languageEnglish
Pages (from-to)1105-1108
Number of pages4
JournalQinghua Daxue Xuebao/Journal of Tsinghua University
Issue number7
StatePublished - Jul 2007
Externally publishedYes


  • Current transformer
  • Error analysis
  • Noise
  • Signal processing
  • Temperature-dependency accuracy


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