BS EN IEC 60076-11:2018 – TC:2020 Edition
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Tracked Changes. Power transformers – Dry-type transformers
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 143 |
IEC 60076-11:2018 is now available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60076-11:2018 applies to dry-type power transformers (including auto-transformers) having values of highest voltage for equipment up to and including 72,5 kV and at least one winding operating at greater than 1,1 kV. This document does not apply to: – gas-filled dry-type transformers where the gas is not air; – single-phase transformers rated at less than 5 kVA; – polyphase transformers rated at less than 15 kVA; – instrument transformers; – starting transformers; – testing transformers; – traction transformers mounted on rolling stock; – flameproof and mining transformers; – welding transformers; – voltage regulating transformers; – small power transformers in which safety is a special consideration. Where IEC standards do not exist for the transformers mentioned above or for other special transformers, this document may be applicable as a whole or in parts. This second edition cancels and replaces the first edition published in 2004 and constitutes a technical revision. The main changes with regard to the previous edition are as follows: – Extension of the scope up to 72,5kV – Enclosure management in regards of the performance – Management of the dielectric and thermal features with altitude – New climatic classes for a better adaptation of customers’ need – Establishment of the relation between location and environmental classes – For fire behaviour classes, limitation at 1000kVA and process of test more robust – Introduction of Seismic class – Recommendations for amorphous transformers Keywords: dry-type transformers The contents of the corrigendum of March 2019 have been included in this copy.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 79 | undefined |
| 82 | Annex ZA(normative)Normative references to international publicationswith their corresponding European publications |
| 84 | English CONTENTS |
| 88 | FOREWORD |
| 90 | 1 Scope 2 Normative references |
| 91 | 3 Terms and definitions |
| 92 | 4 Service conditions 4.1 General 4.2 Normal service conditions |
| 93 | 4.3 Electromagnetic compatibility (EMC) |
| 94 | 5 Rating and general requirements 5.1 General 5.2 Rated power 5.2.1 General 5.2.2 Definition of the rated power with fans cooling or heat exchangers 5.2.3 Transformer IP00 (without enclosure) 5.2.4 Transformer with enclosure |
| 95 | 5.2.5 Preferred values of rated power 5.2.6 Loading beyond rated power 5.3 Provision for unusual service conditions |
| 96 | 5.4 Transportation and storage 5.4.1 Transport limitation 5.4.2 Transport acceleration 5.4.3 Temperature and environment conditions for transport and storage |
| 97 | 5.5 Rated voltage and rated frequency 5.5.1 Rated voltage 5.5.2 Rated frequency 5.6 Operation at higher than rated voltage 5.7 Highest voltage for equipment Um and dielectric tests levels 5.8 Identification according to cooling method 5.8.1 General 5.8.2 Identification symbols Table 1 – Letter symbols |
| 98 | 5.8.3 Arrangement of symbols 5.9 Guaranteed temperature rise at rated conditions 5.10 Additional information required for enquiry 5.11 Sound level 5.12 Components and materials 6 Tappings Tables |
| 99 | 7 Connections 8 Ability to withstand short circuit 9 Rating plate 9.1 Rating plate fitted to the transformer |
| 100 | 9.2 Rating plate fitted to the transformer enclosure 10 Temperature-rise limits 10.1 Normal temperature-rise limits Table 2 – Winding temperature-rise limits |
| 101 | 10.2 Reduced temperature rises for transformers designed for high cooling medium temperatures or special cooling medium conditions 10.3 High altitude temperature rise correction 11 Insulation levels 11.1 General Table 3 – Test voltage levels |
| 102 | 11.2 Transformers for use at high altitudes Table 4 – Applied voltage level correction factor |
| 103 | 12 Climatic, environmental and fire behaviour classes 12.1 Climatic classes 12.2 Environmental classes 12.2.1 Transformers for indoor application with or without enclosure and for outdoor application with enclosure |
| 104 | 12.2.2 Dry-type transformers without enclosure for outdoor application 12.3 Fire behaviour classes |
| 105 | 12.4 Test criteria for climatic, environmental and fire behaviour classes 13 Seismic 13.1 General Table 5 – Sequence of tests |
| 106 | 13.2 General seismic class approach 13.2.1 Generalities 13.2.2 The standard amplitude method |
| 107 | 13.2.3 The calculated amplitude method Table 6 – Approximate acceleration level and performance level |
| 108 | 14 Test 14.1 General requirements for tests Table 7 – Ground acceleration level (AG) Table 8 – Recommended super elevation factors (K) Table 9 – Direction factors (D) |
| 109 | 14.2 Routine tests 14.2.1 Measurement of winding resistance 14.2.2 Measurement of voltage ratio and check of phase displacement 14.2.3 Measurement of short-circuit impedance and load loss |
| 110 | 14.2.4 Measurement of no-load loss and current 14.2.5 Applied voltage test (AV) 14.2.6 Induced voltage withstand test (IVW) 14.2.7 Partial discharge measurement |
| 111 | Figures Figure 1 – Basic measuring circuit for the partial discharge test for a single-phase transformer Figure 2 – Basic measuring circuit for the partial discharge test for a three-phase transformer |
| 112 | 14.3 Type tests 14.3.1 Full wave lightning impulse test (LI) Figure 3 – Voltage application for routine partial discharge test |
| 113 | 14.3.2 Temperature-rise test |
| 115 | Figure 4 – Example of back-to-back method – Single phase Figure 5 – Example of back-to-back method – Three-phase |
| 116 | 14.4 Special tests 14.4.1 Partial discharge measurement for transformers operated under a single phase line-to-earth fault condition |
| 117 | 14.4.2 Measurement of sound level 14.4.3 Short-circuit test 14.4.4 Climatic tests Figure 6 – Voltage application for special partial discharge test Table 10 – Climatic class features |
| 119 | 14.4.5 Environmental test |
| 120 | Table 11 – Environmental classes |
| 121 | 14.4.6 Fire behaviour test |
| 122 | Table 12 – Dimension of the chamber |
| 123 | Figure 7 – Test chamber |
| 124 | Figure 8 – Test chamber details |
| 127 | 14.4.7 Seismic test |
| 128 | 14.4.8 Special test for transformers equipped with amorphous core 15 Tolerances |
| 129 | 16 Protection against direct contact 17 Degrees of protection provided by enclosures 18 Earthing terminal 19 Information required with enquiry and order |
| 130 | Annexes Annex A (informative) Installation and safety of dry-type transformers A.1 Manuals A.2 Installation A.2.1 General A.2.2 Intrinsic safety A.2.3 Installation precautions |
| 131 | A.2.4 Installation design |
| 132 | Annex B (informative) Environmental test for evaluation of outdoor transformers without enclosure B.1 General B.2 Salt-fog and UV-radiation chamber test B.2.1 Test description Table B.1 – Outdoor environmental classes |
| 133 | Figure B.1 – Salt fog multi-parameter ageing cycle |
| 134 | B.2.2 Acceptance criteria: B.3 Core and clamp coating test B.3.1 Test description B.3.2 Acceptance criteria B.4 Field test B.4.1 Test description |
| 135 | B.4.2 Acceptance criteria |
| 136 | Annex C (normative) Cooling of transformer in naturally ventilated room C.1 Assumptions Figure C.1 – Heat dissipation in a natural ventilated room |
| 137 | C.2 Data for the calculation of ventilation C.3 Output |
| 138 | C.4 Numerical application for a 1 000 kVA transformer |
| 139 | Annex D (normative) Calculation of the losses with different reference temperatures and/or winding material |
| 142 | Bibliography |
