Abstract
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 language | English |
|---|---|
| Pages (from-to) | 1105-1108 |
| Number of pages | 4 |
| Journal | Qinghua Daxue Xuebao/Journal of Tsinghua University |
| Volume | 47 |
| Issue number | 7 |
| State | Published - Jul 2007 |
| Externally published | Yes |
Keywords
- Current transformer
- Error analysis
- Noise
- Signal processing
- Temperature-dependency accuracy