{"id":3303,"date":"2016-12-08T03:00:17","date_gmt":"2016-12-08T10:00:17","guid":{"rendered":"https:\/\/brainfiller.com\/?p=3303"},"modified":"2025-11-19T09:40:31","modified_gmt":"2025-11-19T16:40:31","slug":"short-circuit-data-per-unit-amps-symmetrical-components","status":"publish","type":"post","link":"https:\/\/brainfiller.com\/es\/electrical-safety-codes-and-standards\/short-circuit-data-per-unit-amps-symmetrical-components\/","title":{"rendered":"Datos de cortocircuito: por unidad, amperios y componentes sim\u00e9tricos"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3303\" class=\"elementor elementor-3303\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-472eb8d elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"472eb8d\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-6964ced\" data-id=\"6964ced\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-168c3c8 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"168c3c8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-11516096 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"11516096\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-472e6f0\" data-id=\"472e6f0\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-5bfb4aaf elementor-widget elementor-widget-text-editor\" data-id=\"5bfb4aaf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Making Sense of the Numbers<\/strong><br \/><strong>Utility Company Short-circuit Data For Arc Flash Studies<\/strong><\/p><p>Electrical Contractor Magazine &#8211; November 2012<br \/>Jim Phillips, P.E.<\/p><p>One of the first steps in performing an arc flash hazard calculation study is to request the short-circuit data from the electric utility company. This information is critical because it defines the magnitude of current that could flow from the utility and is used as a starting point for arc flash calculations.<\/p><p>In addition to requesting this data for normal operating conditions, it should also be requested based on minimum short-circuit current conditions, if available. The minimum condition could be for a utility transformer or transmission line out of service or similar scenario. The minimum value can then be used to determine if the lower current could result in a protective device operating more slowly, which may increase the total incident energy during an arc flash.<\/p><h2>Too many numbers\u2014now what?<\/h2><p>Unfortunately, a single standardized format for short-circuit data does not exist. Instead, depending on the individual utility, data may be provided in one of several different formats such as the following:<\/p><ul><li>Short-circuit amperes (A)<\/li><li>Short-circuit megavolt-amperes (MVA)<\/li><li>Per-unit and symmetrical components<\/li><\/ul><p>Of course, with multiple formats, confusion could (and often does) result. I will compare the different formats using a three-phase short-circuit current of 6,000A at the 23-kilovolt (kV) level. Since arc flash calculations are based on a three-phase model, only the three-phase short-circuit calculations are used. Some of the values are slightly rounded.<\/p><h2>Short-circuit ampere format<\/h2><p>This is the simplest format because it defines the short-circuit current in terms of amperes at a specified location. As an example, the utility has provided the following information:<\/p><p>Short-circuit amperes three-phase = 6,000A<br \/>Voltage = 23 kV line-to-line<\/p><p>Since the data is already in terms of amperes, no additional calculations are necessary.<\/p><h2>Short-circuit MVA format<\/h2><p>Utility companies often provide short- circuit data in terms of short-circuit MVA. This format combines the short-circuit current with the voltage and the square root of 3 (for a three-phase representation) to provide the data in terms of short-circuit power. Below is an example of the MVA format.<\/p><p>Three-phase short-circuit MVA = 240 MVA<br \/>Voltage = 23 kV line-to-line<\/p><p>To convert three-phase short-circuit MVA to short-circuit current in amperes, use the following equations:<\/p><p>Short-circuit amperes = [MVA x 1,000] \/ [kV line-to-line x the square root of 3]<\/p><p>where 1,000 is the conversion from MVA to kVA<\/p><p>Short-circuit amperes = [240 MVA x 1,000] \/ [23 kV line-to-line x 1.732]<br \/>Short-circuit amperes = 6,000A<\/p><p><a href=\"http:\/\/www.arcflashforum.com\/viewtopic.php?f=34&amp;t=3301\">READ MORE<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Making Sense of the Numbers Utility Company Short-circuit Data For Arc Flash Studies Electrical Contractor Magazine &#8211; November 2012 Jim Phillips, P.E. One of the first steps in performing an arc flash hazard calculation study is to request the short-circuit&#8230;<\/p>","protected":false},"author":2,"featured_media":28467,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_theme","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"categories":[406,403,412,407,408],"tags":[],"class_list":["post-3303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arc-flash-safety-and-hazard-analysis","category-electrical-safety-codes-and-standards","category-electrical-safety-training-and-culture","category-emerging-electrical-safety-technologies-and-trends","category-short-circuit-analysis-and-fault-current-calculations"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Short Circuit Data - Per Unit, Amps and Symmetrical Components - Arc Flash &amp; Electrical Power Training | Brainfiller<\/title>\n<meta name=\"description\" content=\"Making Sense of the Numbers Utility Company Short-circuit Data For Arc Flash Studies Electrical Contractor Magazine - November 2012 Jim Phillips, P.E. 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