Application of Rogowski Coil for Improving Security of Transformer Differential Protection
| Autor: | Ebrahim Farjah, Teymoor Ghanbari, Farshid Naseri, Sepehr Karimi, Ramin Qaedi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Computer science
020209 energy 010401 analytical chemistry Protective relay 02 engineering and technology Fault (power engineering) 01 natural sciences Current transformer 0104 chemical sciences law.invention Harmonic analysis Test case law 0202 electrical engineering electronic engineering information engineering Electronic engineering Harmonic Transformer Rogowski coil |
| Zdroj: | 2020 28th Iranian Conference on Electrical Engineering (ICEE). |
| DOI: | 10.1109/icee50131.2020.9261006 |
| Popis: | This paper presents a simple method for improving the security and reliability of Harmonic Blocking Algorithms (HBAs) in differential protection of power transformers. In the proposed method, instead of using conventional Current Transformer (CT), Rogowski Coil Sensor (RCS) is utilized for sensing the transformer currents. Based on a theoretic analysis, it is shown that the use of RCS increases the margin between the second harmonic ratio levels of the energization and fault conditions, thereby increasing the HBAs security. Besides, the use of RCS has the additional advantage of eliminating the problem of CT saturation, which might cause malfunction of the differential relay. The validity of the proposed technique is demonstrated by evaluating extensive test cases in different operating conditions, which are recorded by digital simulations in PSCAD/EMTDC software. Overall, the results demonstrate that the proposed approach improves the security of HBAs by about 6.8%. |
| Databáze: | OpenAIRE |
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