{"id":7897,"date":"2018-06-12T07:00:55","date_gmt":"2018-06-12T06:00:55","guid":{"rendered":"https:\/\/engineernewsnetwork.com\/blog\/?p=7897"},"modified":"2018-06-11T10:01:09","modified_gmt":"2018-06-11T09:01:09","slug":"transducer-dedicated-to-the-measurement-of-leakage-current-in-pv-inverters","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/transducer-dedicated-to-the-measurement-of-leakage-current-in-pv-inverters\/","title":{"rendered":"Transducer dedicated to the measurement of leakage current in PV inverters"},"content":{"rendered":"<p>The <span class=\"highlight highlight-blue\"><a href=\"http:\/\/www.lem.com\" target=\"_blank\" rel=\"noopener\">LDSR model from LEM<\/a><\/span> is a low cost and lightweight (25g) component, with a reduced footprint.<\/p>\n<p>The LDSR is dedicated to measuring the leakage current of 300 mA nominal up to 900 mA peak at 2 KHz frequency.<br \/>\n<script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script><br \/>\n<ins class=\"adsbygoogle\" style=\"display: block; text-align: center;\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\" data-ad-client=\"ca-pub-7565662001938327\" data-ad-slot=\"7585079586\"><\/ins><br \/>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script><br \/>\nIts main application is in transformerless photovoltaic (PV) inverters for the residential market, where it measures AC and DC fault currents and ensures the safety of people around the installation.<\/p>\n<p>The residual or leakage currents that the LDSR model is designed to measure can arise in fault conditions in a number of industrial or power-generation scenarios.<\/p>\n<p>Examples include failure modes such as a short circuits or earth faults.<\/p>\n<p>The connection of a solar panel to the grid raises safety concerns; if a fault occurs there is a potentially serious safety issue around any human contact with the system.<\/p>\n<p>The sensor is mounted onto a PCB for primary and secondary connections &amp; provides an analogue voltage output.<\/p>\n<p>LDSR provides a high overload capability up to 3,300A (for a pulse duration of 100\u03bcs, and with risetime of 500 A\/\u03bcs), as well as a very high level of insulation between primary and measurement circuits, thanks to long creepage and clearance distances (7.1mm), coupled with a CTI (comparative tracking index) of 600V.<\/p>\n<p>Based on a closed-loop Hall ASIC, the LDSR has been designed with a unique integrated primary conductor capable of 35 A on both the phase and N line. This provides excellent common mode rejection.<\/p>\n<p>The proprietary ASIC ensures high-performance accuracy from -40 to +105\u00b0C fulfilling the requirements of the EN 61209 standard.<\/p>\n<p>The LDSR model operates from a +5VDC supply and have a typical current consumption of just 40 mA when measuring 300 mA as nominal primary residual current; It provides access to its internal reference voltage, and to options such as a test winding and demagnetisation functions.<\/p>\n<p>LDSR satisfies the needs of PV inverters, offering a competitive price, low dimensions and complying with all regulatory standards. LDSR is also an excellent alternative to expensive fluxgate solutions due to its small footprint and simple construction.<\/p>\n<p>As well as ensuring safety in solar inverter installations, <span class=\"highlight highlight-blue\"><a href=\"https:\/\/engineernewsnetwork.com\/blog\/lem-launches-new-website-to-enable-users-to-search-product-information-more-efficiently\/\" target=\"_blank\" rel=\"noopener\">LEM<\/a><\/span>\u2019s LDSR product is also ideal for a range of applications that includes symmetry fault detection in medium power inverters and failure detection in a range of power sources.<\/p>\n<p>The transducers are CE and UL marked and conform to the industrial standards. LEM offers a five-year warranty for each transducer.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The LDSR model from LEM is a low cost and lightweight (25g) component, with a reduced footprint. The LDSR is dedicated to measuring the leakage current of 300 mA nominal up to 900 mA peak at 2 KHz frequency. Its main application is in transformerless photovoltaic (PV) inverters for the residential market, where it measures &hellip;<\/p>\n","protected":false},"author":1,"featured_media":7898,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104],"tags":[4478,4138,4479,2670],"class_list":["post-7897","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-electronics","tag-ldsr","tag-lem","tag-photovoltaic","tag-transducers"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Transducer dedicated to the measurement of leakage current in PV inverters - Engineer News Network<\/title>\n<meta name=\"description\" content=\"The LDSR model is a low cost and lightweight (25g) component, with a reduced footprint\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/transducer-dedicated-to-the-measurement-of-leakage-current-in-pv-inverters\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Transducer dedicated to the measurement of leakage current in PV inverters - 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