{"id":255223,"date":"2024-10-19T16:52:14","date_gmt":"2024-10-19T16:52:14","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-61643-3512017\/"},"modified":"2024-10-25T12:18:50","modified_gmt":"2024-10-25T12:18:50","slug":"bs-en-61643-3512017","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-61643-3512017\/","title":{"rendered":"BS EN 61643-351:2017"},"content":{"rendered":"

IEC 61643-351:2016 defines test circuits and test methods for determining and verifying the SIT surge parameters. Preferred performance values for key parameters are given. Surge isolation transformers (SITs) are used for signal transformer applications with signal levels up to 400 V peak to peak. SITs are transformers, with or without an internal-winding screen, with a rated impulse withstand voltage greater than the peak voltage of the expected common-mode surge environment. SITs are applicable to components for surge protection against indirect and direct effects of lightning or other transient overvoltage. SITs are used to mitigate the onward propagation of common-mode voltage surges. This part of IEC 61643 does not cover SIT operation under differential-mode lightning surge conditions. Keywords: Surge isolation transformers (SITs)<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
6<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
8<\/td>\nFOREWORD <\/td>\n<\/tr>\n
10<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
11<\/td>\n1 Scope
2 Normative references
3 Terms, definitions, symbols, abbreviations and acronyms
3.1 Terms and definitions <\/td>\n<\/tr>\n
14<\/td>\n3.2 Symbols
Figures
Figure 1 \u2013 Symbol for two-winding SIT <\/td>\n<\/tr>\n
15<\/td>\nFigure 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
16<\/td>\n3.3 Abbreviations and acronyms
4 Service conditions
4.1 Temperature range
4.2 Humidity
4.3 Altitude
4.4 Microclimate
Tables
Table 1 \u2013 Classification of microclimate condition <\/td>\n<\/tr>\n
17<\/td>\n5 SIT surge conditions
5.1 SIT surge mitigation
Figure 5 \u2013 Common-mode surge conditions for SIT <\/td>\n<\/tr>\n
18<\/td>\n5.2 Common-mode surges
5.3 Differential-mode surges
Figure 6 \u2013 Common-mode surge conditions for SIT with an electric screen <\/td>\n<\/tr>\n
19<\/td>\n6 Characteristics
6.1 Characteristic measurement
6.2 Input winding to output winding capacitance
Figure 7 \u2013 Test circuit to measure SIT internal-winding capacitance <\/td>\n<\/tr>\n
20<\/td>\n6.3 Insulation resistance (IR)
Figure 8 \u2013 Test circuit to measure the internal-winding capacitance of SIT with an electric screen <\/td>\n<\/tr>\n
21<\/td>\nFigure 9 \u2013 Test circuit to measure the insulation resistance of SIT
Figure 10 \u2013 Test circuit to measure the insulation resistance of SIT with an electric screen <\/td>\n<\/tr>\n
22<\/td>\n6.4 Signal SIT voltage-time product
Figure 11 \u2013 Test circuit to measure SIT voltage-time product
Figure 12 \u2013 Generator and SIT secondary voltage waveforms <\/td>\n<\/tr>\n
23<\/td>\n7 Ratings
7.1 Rated impulse withstand voltage
Figure 13 \u2013 SIT rated impulse voltage test circuit <\/td>\n<\/tr>\n
24<\/td>\nFigure 14 \u2013 Rated impulse voltage test circuit for SIT with an electric screen
Figure 15 \u2013 Construction of pass\/fail template from the 1,2\/50 open-circuit waveform <\/td>\n<\/tr>\n
25<\/td>\nFigure 16 \u2013 Pass\/fail template and test waveforms <\/td>\n<\/tr>\n
26<\/td>\n7.2 Signal SIT rated winding direct current
Table 2 \u2013 Impulse withstand test voltage for rated impulse voltage <\/td>\n<\/tr>\n
27<\/td>\nFigure 17 \u2013 Winding conductor temperature rise test circuit <\/td>\n<\/tr>\n
28<\/td>\n8 Identification
8.1 General
8.2 Datasheet
8.3 Marking <\/td>\n<\/tr>\n
29<\/td>\nAnnex A (informative) 1,2\/50 impulse
Figure A.1 \u2013 1,2\/50 time periods and voltage amplitudes
Table A.1 \u2013 1,2\/50 voltage impulse generator parameters <\/td>\n<\/tr>\n
30<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Components for low-voltage surge protective devices – Performance requirements and test methods for telecommunications and signalling network surge isolation transformers (SIT)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2017<\/td>\n32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":255229,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[603,2641],"product_tag":[],"class_list":{"0":"post-255223","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-33-040-99","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/255223","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/255229"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=255223"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=255223"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=255223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}