{"id":477,"date":"2023-04-03T08:05:00","date_gmt":"2023-04-03T08:05:00","guid":{"rendered":"https:\/\/copperfiction.com\/?p=477"},"modified":"2026-04-09T21:50:11","modified_gmt":"2026-04-09T21:50:11","slug":"multi-voltage-measurement-on-three-phase-power","status":"publish","type":"post","link":"https:\/\/copperfiction.com\/index.php\/2023\/04\/03\/multi-voltage-measurement-on-three-phase-power\/","title":{"rendered":"[025] THREE-PHASE VOLTAGE SENSOR"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"400\" src=\"https:\/\/copperfiction.com\/wp-content\/uploads\/2026\/04\/image1-13.png\" alt=\"\" class=\"wp-image-478\" srcset=\"https:\/\/copperfiction.com\/wp-content\/uploads\/2026\/04\/image1-13.png 900w, https:\/\/copperfiction.com\/wp-content\/uploads\/2026\/04\/image1-13-300x133.png 300w, https:\/\/copperfiction.com\/wp-content\/uploads\/2026\/04\/image1-13-768x341.png 768w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Measuring multiple voltages on a three-phase system stacks up constraints quickly: high signal levels, mandatory isolation, self-powering from the measured bus, and everything has to fit inside a DIN rail enclosure.<\/p>\n\n\n\n<p>Voltage transformers were chosen over resistive dividers \u2014 for safety, galvanic isolation, and signal quality. Outputs are conditioned before hitting the STM32G0B0CET6&#8217;s ADC. Analog multiplexing lets several channels share a single measurement path, keeping the hardware compact.<\/p>\n\n\n\n<p>The board powers itself via a buck converter fed from the bus it measures. That sounds straightforward, but switching noise on an analog measurement board is a genuine concern \u2014 placement, supply separation, grounding strategy, and filtering were all handled carefully. RS485 telemetry for reporting. The DIN rail enclosure imposed mechanical constraints from day one.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Measuring multiple voltages on a three-phase system stacks up constraints quickly: high signal levels, mandatory isolation, self-powering from the measured bus, and everything has to fit inside a DIN rail enclosure. Voltage transformers were chosen over resistive dividers \u2014 for safety, galvanic isolation, and signal quality. Outputs are conditioned before hitting the STM32G0B0CET6&#8217;s ADC. Analog &#8230; <a title=\"[025] THREE-PHASE VOLTAGE SENSOR\" class=\"read-more\" href=\"https:\/\/copperfiction.com\/index.php\/2023\/04\/03\/multi-voltage-measurement-on-three-phase-power\/\" aria-label=\"Read more about [025] THREE-PHASE VOLTAGE SENSOR\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[68],"tags":[75,77,76],"class_list":["post-477","post","type-post","status-publish","format-standard","hentry","category-68","tag-analog-multiplexing","tag-buck","tag-voltage-sensors"],"_links":{"self":[{"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/posts\/477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/comments?post=477"}],"version-history":[{"count":7,"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/posts\/477\/revisions"}],"predecessor-version":[{"id":633,"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/posts\/477\/revisions\/633"}],"wp:attachment":[{"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/media?parent=477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/categories?post=477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/copperfiction.com\/index.php\/wp-json\/wp\/v2\/tags?post=477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}