IEEE C57.119 2018
$33.58
IEEE Recommended Practice for Performing Temperature Rise Tests on Liquid-Immersed Power Transformers at Loads Beyond Nameplate Ratings
| Published By | Publication Date | Number of Pages |
| IEEE | 2018 | 49 |
Revision Standard – Active. Recommendations are made, where possible, regarding the performance and evaluation of temperature rise tests on liquid-immersed power transformers beyond nameplate ratings in this recommended practice. The intent is to assist power transformer manufacturers, and the ultimate users, in evaluating theremal performance of the transformers under varying loads.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | IEEE Std C57.119™-2018 Front cover |
| 2 | Title page |
| 4 | Important Notices and Disclaimers Concerning IEEE Standards Documents |
| 7 | Participants |
| 9 | Introduction |
| 11 | Contents |
| 13 | 1. Overview 1.1 Scope 1.2 Purpose |
| 14 | 2. Normative references |
| 15 | 3. Definitions, symbols, and subscripts 3.1 Definitions |
| 16 | 3.2 Symbols |
| 18 | 3.3 Subscripts 4. General 4.1 Preliminary evaluation |
| 19 | 4.2 Cooling equipment operation 5. Precautions 5.1 Thermal degradation 5.2 Other factors limiting loading 5.3 Monitoring of test results |
| 20 | 5.4 Maximum temperatures 6. Monitored data 6.1 Ambient air temperature 6.2 Insulating liquid temperatures 6.3 Other temperatures |
| 21 | 6.4 Currents 7. Recorded data 7.1 Losses 7.2 Temperature indicator readings 7.3 Tank surface and other temperatures 7.4 Insulating liquid levels 8. Insulating liquid samples |
| 22 | 9. Test procedure for determining the thermal characteristics of liquid-immersed power transformers 9.1 Tap position and connection 9.2 Number of tests 9.3 Applied test currents 9.4 Discontinued tests |
| 23 | 9.5 Temperature rise test at rated load 9.6 Temperature rise test at reduced load |
| 24 | 9.7 Temperature rise test at load beyond nameplate rating 9.8 Evaluation of thermal data |
| 27 | 9.9 Evaluation of other data 10. Test procedure for performing load cycle temperature rise tests 10.1 Recommended prior tests 10.2 Information specified by user |
| 28 | 10.3 Determination of load cycle 10.4 Preparatory calculations |
| 29 | 10.5 Data recorded 10.6 Test procedure |
| 31 | 10.7 Interrupted test 10.8 Assessment of transformer performance 11. Integrated test procedures for determining thermal characteristics and for performing load cycle temperature rise tests 11.1 Load cycle simulation |
| 32 | 11.2 Preliminary evaluation 11.3 Test procedure 11.4 Initial test 11.5 Conditioning load 11.6 Beyond maximum nameplate test |
| 33 | Annex A (normative) Loading guide equations A.1 Explanation of equations A.2 Ultimate top insulating liquid rise for load L A.3 Ultimate winding hottest spot temperature rise over top insulating liquid for load L A.4 Transient heating equation for top insulating liquid rise over ambient temperature A.5 Hottest spot temperature |
| 34 | A.6 Thermal capacity A.7 Time constants |
| 35 | Annex B (informative) Tutorial B.1 Transformer temperature considerations B.2 History |
| 36 | B.3 Problems determining thermal characteristics |
| 44 | B.4 Temperature rise testing to verify loading to a load cycle |
| 45 | B.5 Simplified test procedure to simulate a load cycle |
| 46 | Annex C (informative) Hottest spot measurements using direct reading fiber optics temperature measurements |
| 47 | Annex D (informative) Bibliography |
| 49 | Back cover |
