IEC 61643-352:2018 covers the application of surge isolation transformers (SITs) that are used in telecommunication transformer applications with signal levels up to 400 V peak to peak. These transformers have a high rated impulse voltage with or without screen between the input and output windings. SITs are components for surge protection and are used to mitigate the onward propagation of common-mode voltage surges. This document describes SITs’ selection, application principles and related information. This document does not cover power line communication transformers.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | INTRODUCTION <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 1 Scope 2 Normative references 3 Terms, definitions, symbols and abbreviated terms 3.1 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 3.2 Symbols Figures Figure 1 \u2013 Symbol for a two-winding SIT <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 3.3 Abbreviated terms Figure 2 \u2013 Symbol for a two-winding SIT with polarity indication Figure 3 \u2013 Symbol for a two-winding SIT with electric screen Figure 4 \u2013 SIT with centre tapped windings <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 4 Service conditions 4.1 Temperature range 4.2 Humidity 4.3 Altitude 4.4 Microclimate Tables Table 1 \u2013 List of abbreviated terms used in this document Table 2 \u2013 Classification of microclimate condition <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 5 SIT surge conditions 5.1 SIT surge mitigation Figure 5 \u2013 Common-mode surge conditions for SIT <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.2 Common-mode surges Figure 6 \u2013 Common-mode surge conditions for SIT with an electric screen <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 5.3 Differential-mode surges 5.3.1 General 5.3.2 Ethernet transformer differential surge action 6 Selection 6.1 General 6.2 Impulse withstand voltage Figure 7 \u2013 Transformer differential surge truncation <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 6.3 Rated values of SIT 7 Applications 7.1 General 7.2 Example of surge protection using SITs with ES for control and terminal equipment installed in two different buildings respectively 7.3 Example of surge protection using SITs for telecommunication equipment in substation Figure 8 \u2013 Example of surge protection using SITs in order toisolate two different buildings <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 9 \u2013 Example of surge protection using SITs in substation <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7.4 Example of surge protection using SITs for transmission and switching equipment installed in different floors in a communication building Figure 10 \u2013 Example of surge protection using SITs in a communication building <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.5 Example of surge protection using SITs for computer network equipment in a data centre 7.6 Example of surge protection using SITs for a Power over Ethernet (PoE) system Figure 11 \u2013 Example of surge protection using SITs in a data centre Figure 12 \u2013 Example of surge protection using SITs for a Power over Ethernet (PoE) system <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 7.7 Example of surge protection using SITs for LAN Figure 13 \u2013 Example of surge protection using SITs for LAN <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Annex A (informative) Lightning overvoltages of telecommunication line Figure A.1 \u2013 Lightning overvoltages of telecommunication line <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Components for low-voltage surge protection – Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs)<\/b><\/p>\n |