{"id":430749,"date":"2024-10-20T07:24:30","date_gmt":"2024-10-20T07:24:30","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iec-60076-252023\/"},"modified":"2024-10-26T14:04:37","modified_gmt":"2024-10-26T14:04:37","slug":"bs-en-iec-60076-252023","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iec-60076-252023\/","title":{"rendered":"BS EN IEC 60076-25:2023"},"content":{"rendered":"<p>IEC 60076-25:2023 applies to dry type natural air-cooled resistors, for neutral grounding of transformers and generators, in order to limit the earth fault current in power systems by means of metallic resistive elements. For the purposes of this document, the resistor can be: <\/p>\n<ul>\n<li style=\"text-align:justify\">used alone or in combination with other electrotechnical products not covered by this document, such as (but not limited to): a step-down single-phase transformer, an open triangle or zig-zag transformer (where the neutral point is not available) and a Petersen coil reactor (in order to increase active power contribution to the fault or reduce time constant for proper protection operation or both);<\/li>\n<li style=\"text-align:justify\">designed, manufactured and verified on a one-off basis or fully standardized and manufactured in quantity.<\/li>\n<\/ul>\n<p>Both terms &#8220;neutral grounding resistor&#8221; (NGR) and &#8220;neutral earthing resistor&#8221; (NER) can be used. However, for the purposes of this document and in order to avoid any confusion with &#8220;neutral earthing reactor&#8221; (NER), the term &#8220;neutral grounding resistor&#8221; (NGR) is used. This document specifies: <\/p>\n<ul>\n<li style=\"text-align:justify\">the characteristics of the NGR;<\/li>\n<li style=\"text-align:justify\">the service conditions requirements for NGRs;<\/li>\n<li style=\"text-align:justify\">the tests and test methods for confirming that these conditions have been met;<\/li>\n<li style=\"text-align:justify\">the requirements relating to marking for NGRs.<\/li>\n<\/ul>\n<p>Annex A provides guidance on how to consider the effect of resistance variation with temperature.<\/p>\n<h4>PDF Catalog<\/h4>\n<table border=\"1px\" class=\"des-table\">\n<tr>\n<th>PDF Pages<\/th>\n<th>PDF Title<\/th>\n<\/tr>\n<tr>\n<td><b>2<b><\/td>\n<td>undefined  <\/td>\n<\/tr>\n<tr>\n<td><b>5<b><\/td>\n<td>Annex ZA (normative)Normative references to international publicationswith their corresponding European publications  <\/td>\n<\/tr>\n<tr>\n<td><b>6<b><\/td>\n<td>Blank Page  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>English <br \/> CONTENTS  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>FOREWORD  <\/td>\n<\/tr>\n<tr>\n<td><b>11<b><\/td>\n<td>1 Scope <br \/> 2 Normative references  <\/td>\n<\/tr>\n<tr>\n<td><b>12<b><\/td>\n<td>3 Terms and definitions  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>4 Service conditions <br \/> 5 Ratings <br \/> 5.1 Rated ambient temperature  <br \/> 5.2 Rated resistance (R) <br \/> 5.3 Maximum resistance variation <br \/> 5.4 Rated time <br \/> 5.5 Rated voltage (Ur)  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>5.6 Rated insulation level <br \/> 5.7 Rated short time current  <br \/> 5.8 Rated continuous current  <br \/> 5.9 Rated frequency  <br \/> Table 1 \u2013 Rated insulation levels   <\/td>\n<\/tr>\n<tr>\n<td><b>16<b><\/td>\n<td>6 Rating plates (Nameplates)  <br \/> 6.1 General <br \/> 6.2 Minimum information to be provided <br \/> 7 Design and construction <br \/> 7.1 General <br \/> 7.2 Resistive elements  <\/td>\n<\/tr>\n<tr>\n<td><b>17<b><\/td>\n<td>7.3 Resistive banks <br \/> 7.4 Electrical connections <br \/> 7.5 IN and OUT terminals <br \/> 7.5.1 General <br \/> 7.5.2 IN terminal <br \/> 7.5.3 OUT terminal <br \/> Table 2 \u2013 Maximum temperature rises above ambient for resistive elements   <\/td>\n<\/tr>\n<tr>\n<td><b>18<b><\/td>\n<td>7.6 Insulators <br \/> 7.6.1 General <br \/> 7.6.2 Insulators between resistive elements <br \/> 7.6.3 Insulators between resistor banks and enclosure <br \/> 7.6.4 Creepage distance <br \/> 7.7 Enclosure <br \/> 7.7.1 Protection against contact with live parts, ingress of solid foreign bodies and water <br \/> 7.7.2 Design  <\/td>\n<\/tr>\n<tr>\n<td><b>19<b><\/td>\n<td>7.7.3 Protection against corrosion <br \/> 8 Tests <br \/> 8.1 General <br \/> 8.2 Test classifications <br \/> 8.2.1 Routine tests <br \/> 8.2.2 Type tests <br \/> Table 3 \u2013 Tests classifications  <\/td>\n<\/tr>\n<tr>\n<td><b>20<b><\/td>\n<td>8.2.3 Special tests <br \/> 8.3 Test documentation <br \/> 8.4 Routine tests <br \/> 8.4.1 Visual inspection and dimensional verification <br \/> 8.4.2 Rated resistance measurement <br \/> 8.4.3 Power frequency withstand voltage test  <\/td>\n<\/tr>\n<tr>\n<td><b>21<b><\/td>\n<td>8.4.4 Insulation resistance   <\/td>\n<\/tr>\n<tr>\n<td><b>22<b><\/td>\n<td>8.5 Temperature rise tests <br \/> 8.5.1 General <br \/> 8.5.2 Continuous current duty <br \/> 8.5.3 Rated time duty  <\/td>\n<\/tr>\n<tr>\n<td><b>23<b><\/td>\n<td>8.5.4 Tolerances <br \/> 8.5.5 Acceptance criteria <br \/> 8.6 Special tests <br \/> 8.6.1 Inductance measurement <br \/> 8.6.2 Lightning impulse test <br \/> 8.6.3 Mechanical design verification  <\/td>\n<\/tr>\n<tr>\n<td><b>24<b><\/td>\n<td>8.6.4 Protection degree of enclosure  <\/td>\n<\/tr>\n<tr>\n<td><b>25<b><\/td>\n<td>Annex A (informative)Resistance variation  <br \/> A.1 General <br \/> A.2 Material properties <br \/> A.3 Effect of NGR resistance variation  <\/td>\n<\/tr>\n<tr>\n<td><b>26<b><\/td>\n<td>A.4 Rate of variation <br \/> Figure A.1 \u2013 Ground fault protection settings example <br \/> Table A.1 \u2013 Resistance and current change with temperature rise  <\/td>\n<\/tr>\n<tr>\n<td><b>27<b><\/td>\n<td>A.5 Consecutive faults <br \/> A.6 Protection coordination <br \/> A.7 System capacitive charging current <br \/> A.8 Conclusion  <\/td>\n<\/tr>\n<tr>\n<td><b>28<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Power transformers &#8211; Neutral grounding resistors<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2023<\/td>\n<td>30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":430756,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-430749","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/430749","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\/430756"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=430749"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=430749"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=430749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}