Summary
Read more on ELECTRAThe Technical Brochure of Joint Working Group JWG A2/D1.51 deals with possible improvements to partial discharge (PD) measurements for factory acceptance test and site acceptance tests of power transformers. Main proposed improvement is the calibration procedure for UHF measurements to achieve comparable measurement results for a proposed frequency range while using different sensors, measuring devices, cables and amplifiers.
Table of content
1. Introduction
1.1. Objective of Brochure
1.2. Structure of Brochure
2. Definitions And Initial Considerations
2.1. Definition of PD
2.2. Definition of Calibration
2.3. Definition of Factory Acceptance Test (FAT)
2.4. Definition of Site Acceptance Test (SAT)
2.5. Motivation for improvement of PD measurements during FAT and SAT
2.6. Relevant PD Measuring Methods for FAT and SAT
3. Electrical method according IEC 60270 and its calibration
3.1. Calibration according to IEC 60270
3.2. Acceptance criteria according IEC 60076-3
4. Electromagnetic Method (UHF) and its Calibration
4.1. UHF sensors
4.2. Sensor characteristics
4.3. Recommendation for Placement of UHF Sensors on Power transformers
4.4. Recommendations for the Number of UHF Sensors on Power Transformers
4.5. Calibration of electromagnetic method
4.6. Pre-conditions for UHF Calibration
4.7. Comparison of electrical and UHF measurement procedure
4.8. Performance check of systems and sensors
5. Technical considerations of PD measurements for FAT and SAT
5.1. Emission spectra of PD
5.2. Most common sources of noise and measures to optimize SNR
5.3. Influence of transmission path
5.4. Correlation between UHF signal and IEC 60270 quantities
5.5. Applicability of UHF Sensitivity Check for GIS to Transformers
6. Case Studies
6.1. Case Study 1 (SAT) 333 MVA – Substation Transformer
6.2. Case Study 2 (FAT) - Generator Transformer
6.3. Case Study 3 (FAT) - Single Phase Transformer
6.4. Case Study 4 (FAT) - Repaired 123 kV Substation Transformer
7. Measurement campaigns of The Working Group
7.1. Initial Laboratory Investigation of different UHF sensors
7.2. On-site Investigation of different Measurement systems and signal generators
7.3. Calibration Method in Laboratory
8. Recommendations for improved PD acceptance tests
9. Outlook for further improvements
9.1. Criteria Overview
9.2. Decision Tree
9.3. Outlook
10. Conclusion
11. References
Appendix A
A.1. Introduction
A.2. Summary of measurement principles
A.3. Traceability of the Measurements
Additional informations
| Publication type | Technical Brochures |
|---|---|
| Reference | 861 |
| Publication year | |
| Publisher | CIGRE |
| ISBN | 978-2-85873-566-2 |
| Study committees | |
| Working groups | JWG A2/D1.51 |
| File size | 9 MB |
| Pages number | 115 |
| Price for non member | 220 € |
| Price for member | Free |
Authors
S. COENEN, Convenor (DE), S. MARKALOUS, Secretary (DE)
T. LINN (CH), P. MRAZ (CH), M. BELTLE (DE), A. NADERIAN (CA), R. CSELKÓ (HU), V. SCHMIDT (DE), P. FEHLMANN (CH), R. SCHWARZ (AT), J. FUHR † (CH), M. SIEGEL (DE), R. GATECHOMPOL (TH), M. SÖLLER (DE), M. HÄSSIG (CH), J. SZCZECHOWSKI (US), S. HOEK (DE), D. TABAKOVIC (US), M. JUDD (GB), S. TENBOHLEN (DE), U. KEMPF (DE), M. WEBER (DE)
Keywords
power transformers, reactors, materials, emerging test technique
