IEEE C57.161 2018
$52.54
IEEE Guide for Dielectric Frequency Response Test
| Published By | Publication Date | Number of Pages |
| IEEE | 2018 | 76 |
New IEEE Standard – Active. Dielectric Frequency Response (DFR) test methods of liquid immersed transformers are discussed in this guide. The guide includes recommendations for instrumentation, procedures for performing the tests, and techniques for analyzing the data. This guide describes factors affecting the DFR test moisture estimate including winding configuration and measurement set-up, cellulose material type, low molecular weight acids, and background ac/dc noise interference. This guide is applicable to both field and factory applications. The purpose of this guide is to provide the user with information that will assist in performing Dielectric Frequency Response measurements and interpreting the results from these measurements.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | IEEE Std C57.161-2018 Front Cover |
| 2 | Title page |
| 4 | Important Notices and Disclaimers Concerning IEEE Standards Documents |
| 7 | Participants |
| 9 | Introduction |
| 10 | Contents |
| 11 | 1. Overview 1.1 Scope 1.2 Purpose 2. Normative references 3. Definitions Untitled |
| 12 | 4. Dielectric frequency response (DFR) measurement overview 4.1 DFR test 4.2 Use of DFR 4.2.1 Theoretical basis for power factor (PF) and dielectric frequency response (DFR) testing techniques |
| 16 | 4.3 Differences between DFR and single-frequency PF testing techniques |
| 17 | 4.4 DFR moisture application |
| 18 | 4.5 General DFR measurement test practice |
| 19 | 5. Making a DFR measurement 5.1 Safety 5.2 Test environment preparation |
| 20 | 5.3 Test object preparation 5.4 Test set 5.5 Measurement configurations |
| 21 | 5.5.1 UST measurement 5.5.2 GST measurement with guard 5.6 Measurement 5.6.1 Record the temperature |
| 22 | 5.6.2 Environmental condition 5.6.3 Record the transformer nameplate information 5.6.4 LTC tap position 5.6.5 DFR test procedure 5.6.6 Test connections |
| 24 | 6. Test records and report 6.1 Introduction 6.2 Ancillary test information 6.2.1 Transformer (test specimen) information 6.2.2 Test equipment information 6.2.3 Test organization (performer) |
| 25 | 6.2.4 Test set-up information 6.2.5 Assessment parameters 6.3 Test data 6.3.1 Data curves |
| 26 | 6.3.2 Data format 6.3.3 External conditions |
| 27 | 6.3.4 Test results 6.3.5 Test report |
| 28 | 7. Measurement analysis and interpretation 7.1 Introduction 7.2 Modeling |
| 30 | 7.3 Factors influencing moisture estimate |
| 31 | 7.3.1 Winding configuration and measurement set-up 7.3.2 Influence of cellulose material type 7.3.3 Influence of low molecular weight acids |
| 32 | 7.3.4 Influence of ac and dc interference |
| 34 | 7.4 Examples 7.4.1 Aged transformer with very low moisture content |
| 36 | 7.4.2 Aged transformer in reasonably good condition 7.4.3 Aged transformer in poor condition |
| 38 | Annex A (informative) Dielectric frequency response analysis—Theory and validation A.1 Theoretical basis for DFR analysis |
| 40 | A.1.1 Effect of moisture on dielectric response of oil-impregnated cellulose |
| 41 | A.1.2 Effect of temperature on dielectric response in oil-impregnated cellulose |
| 42 | A.1.3 Other effects on dielectric response of oil-impregnated cellulose |
| 43 | A.1.4 Dielectric response of mineral oil |
| 44 | A.2 Modeling dielectric response of a power transformer |
| 45 | A.2.1 Winding configuration A.2.2 Duct structure and model for analysis |
| 47 | A.2.3 Simulation of various parameter influences |
| 53 | A.3 Validation—Summary of reports |
| 60 | A.3.1 Validation statistics |
| 61 | Annex B (informative) Non-moisture related factors influencing the DFR measurements B.1 Introduction B.2 Case 1—Influence of corrosive sulphur contamination |
| 64 | B.3 Case 2—Influence of carbon contamination |
| 66 | B.4 Case 3—Influence of contamination in tap changer |
| 68 | B.5 Case 4—High resistance due to un-shorted core-to-ground resistance |
| 69 | B.6 Case 5—Influence of poor grounding of electrostatic shield |
| 70 | B.7 Conclusion |
| 72 | Annex C (informative) Examples of typical measurement challenges |
| 74 | Annex D (informative) Bibliography |
| 76 | Back Cover |
