{"id":14570,"date":"2021-07-29T12:32:54","date_gmt":"2021-07-29T17:32:54","guid":{"rendered":"https:\/\/blog.wika.com\/us\/\/?p=14570"},"modified":"2025-09-23T13:49:13","modified_gmt":"2025-09-23T18:49:13","slug":"transmission-company-extends-equipment-life-saves-money-with-wikas-sf6-gas-dehydrator","status":"publish","type":"post","link":"https:\/\/blog.wika.com\/us\/products\/sf6-products\/transmission-company-extends-equipment-life-saves-money-with-wikas-sf6-gas-dehydrator\/","title":{"rendered":"Case Study: Preventing Moisture in SF6 Switchgear with WIKA\u2019s SF6 Gas Dehydrator"},"content":{"rendered":"<p><strong>A major power provider in the Midwest was having issues with high humidity levels in its SF<sub>6<\/sub> switchgear. WIKA implemented a cost-effective solution for keeping this insulating gas clean and dry, with significant potential savings.<\/strong><\/p>\n<p><em>By Leo Lopez, Rafael Derencio, Florian Vornberger<\/em><\/p>\n<p>Sulfur hexafluoride (SF<sub>6<\/sub>) insulates medium- and high-voltage switchgears around the world. In its pure form, this non-toxic, inert gas helps the <a href=\"https:\/\/www.wika.com\/en-us\/power_transmission_and_distribution_sf6.WIKA?tab=1\" rel=\"external\" target=\"_blank\">power transmission &amp; distribution (T&amp;D) industry<\/a> operate more safely by extinguishing high-temperature arcs. With a much higher dielectric strength compared to other media, SF<sub>6<\/sub> also allows gas-insulated equipment (GIE) to be compact.<\/p>\n<p>However, as GIE ages, moisture enters the gas compartment to equalize with the dry SF<sub>6<\/sub> gas. <a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/water-impurity-sf6-gas\/\">Water is the most powerful impurity in SF<sub>6<\/sub> switchgear<\/a> because it not only decreases insulation, but its hydrogen and oxygen atoms combine with sulfur and fluorine atoms to form toxic decomposition compounds. Many of the byproducts are corrosive, damaging switchgears and allowing SF<sub>6<\/sub>, a potent greenhouse gas, to escape into the atmosphere. <a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/sf6-leak-detection-and-gas-analysis\/\">Leak detection and gas analysis<\/a> should be priorities for any user of this gas.<\/p>\n<p>There are four main ways to protect T&amp;D infrastructure and the planet from the effects of humid SF<sub>6<\/sub> gas:<\/p>\n<ul>\n<li>Replace the gas-filled equipment that is allowing moisture to enter.<\/li>\n<li>Regularly replace the wet SF6 with new technical-grade gas.<\/li>\n<li>Regularly filter the humid gas and then put it back into the GIE.<\/li>\n<li>Retrofit new absorber kits inside gas compartments with low gas quality.<\/li>\n<\/ul>\n<p>However, these methods are expensive and\/or disruptive.<\/p>\n<h2><strong>How to Deal with Wet SF<sub>6<\/sub><\/strong><\/h2>\n<p>One of the country\u2019s top electrical power transmission companies was seeing high humidity levels in its SF<sub>6<\/sub> gas-insulated switchgear (GIS). Except for that issue, the equipment was in good condition, so the company was eager for a more cost-effective solution than buying new GIS before the end of its planned lifecycle.<\/p>\n<p>Replacing the wet SF<sub>6<\/sub><span>\u00a0<\/span>is another option, albeit also expensive. First, technicians would have to take the equipment offline, which removes a layer of redundancy and affects the grid\u2019s safety. Then they would need to evacuate the contaminated gas and replace it with technical grade SF<sub>6<\/sub>, which is not cheap: a 110 lb. (50 kg) cylinder of SF<sub>6<\/sub><span>\u00a0<\/span>can cost more than $1,000. Recovering the humid SF<sub>6<\/sub> gas, filtering it, and putting it back into GIE would save the company some money, but this process also involves significant downtime of the complete switchgear; replacing the saturated absorber material inside gas compartments shares the same downsides.<\/p>\n<p>The company had tried to \u201cdehydrate\u201d the saturated compartment by filling it with a different gas that was very dry (e.g., N<sub>2<\/sub>), but was unhappy with the results. This method would have only a temporary effect on the dew point, and would still require the equipment to be taken out of service. Furthermore, the residual gas could contaminate the <span class=\"\">SF<sub class=\"\">6<\/sub><\/span>\u00a0even more.<\/p>\n<p>Trying to find a more cost-effective solution that would minimize the time equipment was offline, the company reached out to WIKA\u2019s<a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/wegrid-solutions-sf6-products-and-services\/\">\u00a0WEgrid Solutions<\/a> division.<\/p>\n<h2><strong>WIKA\u2019s Solution: Gas monitoring + gas dehydration<\/strong><\/h2>\n<p>After looking over the company\u2019s operations, WEgrid experts proposed a smart two-part solution:<\/p>\n<ul>\n<li>\n\n      <div class=\"wp-caption alignright\" style=\"max-width:396px;\"><a href=\"https:\/\/blog.wika.com\/us\/\/files\/2021\/07\/gmk-20-topology_wp-4-e1627487844896.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14588 size-ArticleHalf\" src=\"https:\/\/blog.wika.com\/us\/\/files\/2021\/07\/gmk-20-topology_wp-4-388x149.jpg\" alt=\"Arrangement of the WIKA GMK-20 gas monitoring kit\" width=\"388\" height=\"149\" \/><\/a><p class=\"wp-caption-text\">GMK-20 topology (click on image to enlarge)<\/p><\/div>\n    <br \/>\nGas monitoring kit (GMK) with telemetry<\/li>\n<li>Gas dehydrating (GAD) system that dries SF<sub>6<\/sub> without taking GIS offline<\/li>\n<\/ul>\n<p>The GMK and GAD would be manually moved from compartment to compartment every two weeks or so to monitor gas conditions and dehydrate the SF<sub>6<\/sub><\/p>\n<h2><strong>Innovations in Purifying SF<sub>6<\/sub> Gas<\/strong><\/h2>\n<p>The \u201cbrains\u201d of the GMK-20 are a set of <a href=\"https:\/\/www.wika.com\/en-us\/gdht_20.WIKA\" rel=\"external\" target=\"_blank\">GDHT-20<\/a><span>\u00a0<\/span>transmitters with Modbus<sup>\u00ae<\/sup> output. They attach to GIS to measure the <a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/digital-sf6-gas-density-indicator\/\">density<\/a>, <a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/humidity-affects-safety-sf6-insulated-equipment\/\">humidity<\/a>, <a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/gas-temperature-affect-gas-density-measurements\/\">temperature<\/a>, and pressure of the gas; a telemetry system sends real-time information from the transmitter to the cloud and servers via a cellular data connection.<\/p>\n\n      <div class=\"wp-caption alignleft\" style=\"max-width:497px;\"><a href=\"https:\/\/blog.wika.com\/us\/\/files\/2021\/07\/gad-2000-topology.jpg\"><img decoding=\"async\" src=\"https:\/\/blog.wika.com\/us\/\/files\/2021\/07\/gad-2000-topology-388x147.jpg\" \/><\/a><p class=\"wp-caption-text\">GAD-2000 topology (click on image to enlarge)<\/p><\/div>\n    \n<p>When the GMK detects that humidity in the gas has reached a certain level, the <a href=\"https:\/\/www.wika.com\/en-us\/gad_2000.WIKA\" rel=\"external\" target=\"_blank\">GAD-2000<\/a> goes to work. As it removes moisture from SF6, it also dehydrates the absorber material. What\u2019s more, this gas dehydrator cart is also like a dialysis machine for GIS by filtering out harmful decomposition products such as hydrogen fluoride (HF), sulfur dioxide (SO<sub>2<\/sub>), thionyl fluoride (SOF<sub>2<\/sub>), sulfuryl fluoride (SO<sub>2<\/sub>F<sub>2<\/sub>), and sulfur tetrafluoride (SF<sub>4<\/sub>).<\/p>\n<p>Best of all, the GAD-2000 can be used <a href=\"https:\/\/blog.wika.com\/us\/\/products\/sf6-products\/wikas-innovative-dehydrator-removes-moisture-from-sf6-gas-without-stopping-operations\/\">while the GIS is in service<\/a>, thanks to a Safety Control System with several safety functions. This innovation precisely regulates the outtake of humid gas so that the equipment always has enough remaining insulation capacity. A small reservoir of dry, technical grade SF<sub>6<\/sub> on the cart also replenishes the GIE to further improve the gas quality. This process is easy to use and risk-free.<\/p>\n<p>The GAD-2000 allows for hands-off operations. After setting the parameters and starting the main dehydration process, the system will work automatically until the target humidity is reached. (The amount of time this takes will depend on several factors, including the GIE\u2019s age, the working pressure range, and the compartment type and its absorbent materials. Very generally, dehydrating the gas in one compartment takes a week or so.) Throughout the cycle, the operator receives status information \u2013 via text messages to a cell phone \u2013 of how much the dehydration process has already been completed. At the end of the cycle, the operator receives a final notification before the GAD-2000 refills the compartment to its nominal pressure.<\/p>\n<h2><strong>Results: Safety and savings for SF<sub>6<\/sub> switchgear<\/strong><\/h2>\n<p>The combination of GMK-20 and GAD-2000 has proven to be a winning solution for this transmission company\u2019s issue of wet gas. Since the system\u2019s implementation, this customer has successfully maintained safe operational conditions in its GIS at a fraction of the cost of other options. Moreover, the company estimates it will save over $50,000 a year in downtime alone. (Results will vary by facility size, equipment, and other factors.)<\/p>\n<p>The usual lifetime for GIS is 30 to 35 years. Since such equipment is expensive, extending its lifetime by even a few more years means a company can realize tremendous savings. The earlier a T&amp;D provider incorporates this system in its service activities, the fewer humidity-related SF<sub>6<\/sub> failures their equipment will experience, and the longer their GIS will offer reliable and safe service for the electric grid.<\/p>\n<p>With decades of experience in the T&amp;D industry, WEgrid can find a <a href=\"https:\/\/www.wika.com\/media\/Brochures-and-flyers\/Products_Services\/fl_gdt_20_gdht_20_en_co.pdf\" rel=\"external\" target=\"_blank\"><span>solution for your SF<sub>6\u00a0<\/sub>challenges<\/span><\/a>. <a href=\"https:\/\/www.wika.com\/en-us\/contact.WIKA\" rel=\"external\" target=\"_blank\">Contact us<\/a> with your questions and SF<sub>6<\/sub> gas issues.<\/p>\n<p><strong>Products mentioned in this blog:<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/www.wika.com\/en-us\/gdht_20.WIKA\" rel=\"external\" target=\"_blank\">GDHT-20 transmitter with Modbus<sup>\u00ae<\/sup> output<\/a><\/li>\n<li><a href=\"https:\/\/www.wika.com\/en-us\/gad_2000.WIKA?_ga=2.97185055.1045458497.1627480627-779943226.1617718081\" rel=\"external\" target=\"_blank\">GAD-2000 gas dehydration system<\/a><\/li>\n<\/ul>\n<p>[contact-form-7 id=&#8221;14552&#8243; title=&#8221;Blog Contact Form&#8221;]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A major power provider in the Midwest was having issues with high humidity levels in its SF6 switchgear. WIKA implemented a cost-effective solution for keeping this insulating gas clean and dry, with significant potential savings. By Leo Lopez, Rafael Derencio, Florian Vornberger Sulfur hexafluoride (SF6) insulates medium- and high-voltage switchgears around the world. In its [&hellip;]<\/p>\n","protected":false},"author":427,"featured_media":14925,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[232,674],"tags":[851,738,677,998],"class_list":["post-14570","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-applications","category-sf6-products","tag-case-study","tag-gas-insulated-switchgear","tag-sf6","tag-switchgear"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Preventing Moisture in SF6 Switchgear with WIKA Dehydrator - WIKA blog<\/title>\n<meta name=\"description\" content=\"WIKA\u2019s implementation of a gas monitoring kit and gas dehydrator keeps SF6 dry in T&amp;D switchgear at a fraction of the cost of other options.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.wika.com\/us\/applications\/transmission-company-extends-equipment-life-saves-money-with-wikas-sf6-gas-dehydrator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Preventing Moisture in SF6 Switchgear with WIKA Dehydrator - 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A graduate of the University of West Georgia, Josh has built a career marked by rapid growth, cross-functional leadership, and a relentless focus on solving complex customer challenges. At WIKA Group, Josh leads product development and market strategy for WEgrid SF\u2086 Solutions, overseeing the full lifecycle of precision instrumentation products. His role blends technical expertise with strategic vision, ensuring that WIKA\u2019s offerings meet the evolving needs of the energy and utility sectors. Before joining WIKA, Josh advanced through multiple roles at FLW Southeast, Inc., starting as an Inside Sales &amp; Marketing Specialist and rising to Outside Sales Engineer. There, he managed the North Georgia territory, cultivated key manufacturer relationships, and delivered tailored instrumentation solutions to end users. Josh\u2019s early career in the automotive tech industry laid the foundation for his strengths in sales, customer engagement, and team leadership. 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