{"id":7556,"date":"2026-01-05T09:13:52","date_gmt":"2026-01-05T09:13:52","guid":{"rendered":"https:\/\/daelimtransformer.com\/?p=7556"},"modified":"2026-03-14T08:39:22","modified_gmt":"2026-03-14T08:39:22","slug":"how-to-manage-transformer-inrush-current","status":"publish","type":"post","link":"https:\/\/www.daelimtransformer.com\/de\/how-to-manage-transformer-inrush-current.html","title":{"rendered":"Wie verwaltet man den Anlaufstrom von Transformatoren?"},"content":{"rendered":"<div id=\"contentMain\" class=\"article-content\">\n<p><!-- \u5de6\u53f3\u56fe\u6587--><!--\u6587\u5b57\u6a21\u5757--><\/p>\n<div class=\"row\">\n<div class=\"col-lg-12\">\n<div class=\"d-flex align-items-center mb-3 mt-5\">\n<div class=\"d-inline-block w-100 mb-3 mr-auto ml-auto\">\n<p><!--\n\nstyle=\"color:#003b92;\">None<\/h2>\n\n\n--><\/p>\n<div class=\"mb-0 fs-18 customTexts\">\n<p><img decoding=\"async\" src=\"\/media\/115\/How-To-Manage-Transformer-Inrush-Current.webp\" \/><br \/>\n<span style=\"font-size: 18px;\">In this article, we will tackle inrush current for transformers including some of the most modern ways how to avoid\u00a0and effectively handle inrush current. We will also discuss how it affects your electrical system and answer more FAQs surrounding transformer inrush\u00a0current.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Have you ever wondered why the power suddenly cuts off when you turn on a transformer? That could be an inrush current\u00a0wreaking havoc on your power system.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Inrush current\u00a0is a normal reaction of the transformer upon energization. This is indicated by a brief but sudden spike in the current level.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Although this phenomenon can last for split second but could leave your electrical system, especially transformers, with substantial damage depending on how bad the surge is.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">However, with careful planning and engineering, you can do something to manage and protect your system from the effects of inrush current.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p><!-- \u8c46\u8150\u5757\u56fe\u6587\u4e0a\u4e0b--><\/p>\n<div class=\"row mt-3 mb-2\">\n<div class=\"col-lg-4 mb-3\">\n<p><img decoding=\"async\" class=\"img-fluid\" src=\"\/media\/115\/daelim-transformer-power-transformers.webp\" alt=\"High Voltage Transformer\" \/><\/p>\n<div class=\"text-4 mb-3 mt-2 index-title\">High Voltage Transformer<\/div>\n<div class=\"line-height-22 fs-16\" style=\"color: #666;\"><\/div>\n<p><a class=\"btn btn-primary font-weight-bold fs-16 pageBtn\" href=\"https:\/\/www.daelimtransformer.com\/power-transformer.html\">More Detail<\/a><\/p>\n<\/div>\n<div class=\"col-lg-4 mb-3\">\n<p><img decoding=\"async\" class=\"img-fluid\" src=\"\/media\/115\/2500-kva-pad-mount-transformer.webp\" alt=\"Pad Mounted Transformer\" \/><\/p>\n<div class=\"text-4 mb-3 mt-2 index-title\">Pad Mounted Transformer<\/div>\n<div class=\"line-height-22 fs-16\" style=\"color: #666;\"><\/div>\n<p><a class=\"btn btn-primary font-weight-bold fs-16 pageBtn\" href=\"https:\/\/www.daelimtransformer.com\/pad-mounted-transformer.html\">More Detail<\/a><\/p>\n<\/div>\n<div class=\"col-lg-4 mb-3\">\n<p><img decoding=\"async\" class=\"img-fluid\" src=\"\/media\/115\/daelim-transformer-substation-transformers.webp\" alt=\"Substation Transformer\" \/><\/p>\n<div class=\"text-4 mb-3 mt-2 index-title\">Substation Transformer<\/div>\n<div class=\"line-height-22 fs-16\" style=\"color: #666;\"><\/div>\n<p><a class=\"btn btn-primary font-weight-bold fs-16 pageBtn\" href=\"https:\/\/www.daelimtransformer.com\/substation-transformer.html\">More Detail<\/a><\/p>\n<\/div>\n<\/div>\n<p><!-- \u5de6\u53f3\u56fe\u6587--><\/p>\n<p><!--\u6587\u5b57\u6a21\u5757--><\/p>\n<p><!-- \u8c46\u8150\u5757\u56fe\u6587\u4e0a\u4e0b--><\/p>\n<p><!-- \u5de6\u53f3\u56fe\u6587--><\/p>\n<p><!--\u6587\u5b57\u6a21\u5757--><\/p>\n<p><!-- \u8c46\u8150\u5757\u56fe\u6587\u4e0a\u4e0b--><\/p>\n<p><!-- \u5de6\u53f3\u56fe\u6587--><\/p>\n<p><!--\u6587\u5b57\u6a21\u5757--><\/p>\n<p><!-- \u8c46\u8150\u5757\u56fe\u6587\u4e0a\u4e0b--><\/p>\n<p><!-- \u5de6\u53f3\u56fe\u6587--><\/p>\n<p><!--\u6587\u5b57\u6a21\u5757--><\/p>\n<p><!-- \u8c46\u8150\u5757\u56fe\u6587\u4e0a\u4e0b--><\/p>\n<div class=\"row\">\n<div class=\"col-lg-12 article-content\">\n<p><a id=\"mdnTags0\" class=\"mdnTags\" name=\"mdn0\" data-index=\"0\"><\/a><\/p>\n<h2 style=\"margin-top: 27px; margin-bottom: 8px;\"><span class=\"ez-toc-section\" id=\"Ways_To_Manage_Transformer_Inrush_Current\"><\/span><span style=\"font-size: 20px;\"><strong>Ways To Manage Transformer Inrush Current<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-size: 18px;\"><a name=\"_c6aws0pjjxcy\"><\/a><strong>Use a Protective Device<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">There are different protective devices you can use to safeguard your electrical systems and transformers from short-lived inrush currents. Some of the options are to install the following protective devices:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 18px;\">Pre-insertion Resistors<\/span><\/li>\n<li><span style=\"font-size: 18px;\">Inrush Current Protection\u00a0Circuit<\/span><\/li>\n<\/ul>\n<p><span style=\"font-size: 20px;\"><span style=\"color: #27ae60;\"><strong>More about <\/strong><\/span><strong><a href=\"https:\/\/www.daelimtransformer.com\/electrical-transformer-protection.html\"><span style=\"color: #c0392b;\">Transformer Protection<\/span><\/a><\/strong><\/span><\/p>\n<p><a id=\"mdnTags1\" class=\"mdnTags\" name=\"mdn1\" data-index=\"1\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pre-insertion_ResistorsPIRs\"><\/span><span style=\"font-size: 18px;\"><a name=\"_inrdj0vj4b7n\"><\/a><strong>Pre-insertion Resistors(PIRs)<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Adding pre-insertion resistors in the circuit is a highly reliable and tested method in controlling inrush current. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">Pre-insertion resistors are typically connected to the core in series upon transformer energization\u00a0where an inrush current is expected and bypassing it once the electrical flow stabilizes.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">This process involves some basic installations ruled by a simple principle of adding more resistance to the system to counter the inrush current.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Moreover, note that this device should match the system voltage and the transformer ratings. It would also require another additional circuit breaker for control.<\/span><\/p>\n<p><a id=\"mdnTags2\" class=\"mdnTags\" name=\"mdn2\" data-index=\"2\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Inrush_Current_Protection_Circuit\"><\/span><strong><span style=\"font-size: 18px;\"><a name=\"_tcdvij6asq9c\"><\/a>Inrush Current Protection Circuit<\/span><\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/www.daelimtransformer.com\/rental-transformer.html\"><img decoding=\"async\" style=\"float: right; width: 440px; height: 440px;\" title=\"retal transformer\" src=\"\/media\/115\/retal-transformer.webp\" alt=\"retal transformer\" \/><\/a><span style=\"font-size: 18px;\">Inrush current protection circuits are classified into the NTC(Negative Temperature Coefficient) and PTC (Positive Temperature Coefficient) thermistors. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">The choice of application depends on the transformer power rating, frequency, short circuit, prevailing temperature, and budget.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">NTC and PTC thermistors protect the system from inrush currents by reacting to temperature changes within the system.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">The NTC thermistor creates additional resistance when the transformer is switched on. Once current passes through, the temperature of this device increases. When the temperature rises, the resistance is gradually reduced until the current flow reaches the normal level.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">NTC thermistors are often considered the first option because of their simplicity and practicality. However, there are cases in which PTC thermistors are more desired. This is when the system:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 18px;\">Needs frequent resets<\/span><\/li>\n<li><span style=\"font-size: 18px;\">Have to be protected from being short-circuited<\/span><\/li>\n<li><span style=\"font-size: 18px;\">Surrounding temperature goes over or lower than room temperature.<\/span><\/li>\n<\/ul>\n<p><a id=\"mdnTags3\" class=\"mdnTags\" name=\"mdn3\" data-index=\"3\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Design_Optimization\"><\/span><span style=\"font-size: 18px;\"><a name=\"_qj2cl8ouc737\"><\/a><strong>Design Optimization<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">If you are still in the earlier stage of planning your system, it is better to discuss with your manufacturer to consider how they can incorporate effective safety measures that can handle inrush current impact in the transformer design.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Some of the modern techniques available are focused on the:<\/span><\/p>\n<ul>\n<li><span style=\"font-size: 18px;\">Core Construction<\/span><\/li>\n<li><span style=\"font-size: 18px;\">Winding and Core Placement<\/span><\/li>\n<li><span style=\"font-size: 18px;\">Circuit Breaker<\/span><\/li>\n<li><span style=\"font-size: 18px;\">System Configuration<\/span><\/li>\n<li><span style=\"font-size: 18px;\">Controlled Switching<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #27ae60;\"><span style=\"font-size: 20px;\"><strong>Reading more about <\/strong><\/span><\/span><span style=\"font-size: 20px;\"><strong><a href=\"https:\/\/www.daelimtransformer.com\/transformer-impedance.html\"><span style=\"color: #c0392b;\">Transformer Design<\/span><\/a><\/strong><\/span><\/p>\n<p><a id=\"mdnTags4\" class=\"mdnTags\" name=\"mdn4\" data-index=\"4\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Core_Construction\"><\/span><span style=\"font-size: 18px;\"><a name=\"_6xzzc7qdjlgz\"><\/a><strong>Core Construction<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">The material and design of the core can play an important part in suppressing the effects of\u00a0transformer inrush current.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">As much as possible choose a <a href=\"https:\/\/ieeexplore.ieee.org\/document\/8508702\" target=\"_blank\" rel=\"noopener\">material<\/a> and design that has low magnetic saturation levels and low residual magnetism.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Solid iron material and silicon steel are some of the few options. Avoid\u00a0using amorphous or noncrystalline alloys as they can increase inrush current instead.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">As for the <\/span><a style=\"font-size: 18px;\" href=\"https:\/\/www.electrical4u.com\/magnetic-saturation\/\" target=\"_blank\" rel=\"noopener\">design<\/a><span style=\"font-size: 18px;\">, ideally, the core must have more turns, minimal air gaps, and adequate space to avoid saturating the core in case of heavy inrush current.<\/span><\/p>\n<p><span style=\"color: #27ae60;\"><span style=\"font-size: 20px;\"><strong>Try for free:\u00a0<\/strong><\/span><\/span><span style=\"font-size: 20px;\"><strong><a href=\"https:\/\/www.daelimtransformer.com\/core-type-transformer.html\"><span style=\"color: #c0392b;\">The Ultimate Guide to Core Type Transformers<\/span><\/a><\/strong><\/span><\/p>\n<p><a id=\"mdnTags5\" class=\"mdnTags\" name=\"mdn5\" data-index=\"5\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Winding_and_Core_Placement\"><\/span><span style=\"font-size: 18px;\"><a name=\"_bncrkb7uegqt\"><\/a><strong>Winding\u00a0and Core Placement<\/strong><\/span><img decoding=\"async\" style=\"width: 300px; height: 300px; float: right;\" src=\"\/media\/115\/1000-kva-pad-mounted-transformer-winding-jamaica.webp\" \/><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Most windings are positioned close to the core to facilitate mutual induction. However, this could easily result in saturation.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Saturation is one thing you need to avoid to prevent inrush current and the possible damage it can cause to the transformer core.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">One way to prevent\u00a0saturation is to position the primary winding on the outmost layer far off the core. This will help slow down the energization\u00a0process and effectively reduce\u00a0the amount of inrush current flowing into the system.<\/span><\/p>\n<p><a id=\"mdnTags6\" class=\"mdnTags\" name=\"mdn6\" data-index=\"6\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Circuit_Breaker\"><\/span><span style=\"font-size: 18px;\"><a name=\"_6bpphbmriky\"><\/a><strong>Circuit Breaker <\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Circuit breakers are an essential part of an electrical system which serves as a switch-off mechanism once an overcurrent is detected.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Some circuit breakers like the slow-blow type are temperature sensitive. Its function is to switch off the transformer before it overheats.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">However, if the circuit breaker needs to be adequately sized, in the event of an inrush current you may experience unwanted trip offs that could result in frequent resets and delays.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">To avoid this scenario and to achieve a well-protected electrical system, the circuit breaker has to be appropriately sized according to the transformer size and specification.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">The parameters and calculations should also be guided by the standards established by the National Electrical Code.<\/span><\/p>\n<p><a id=\"mdnTags7\" class=\"mdnTags\" name=\"mdn7\" data-index=\"7\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"System_Configuration\"><\/span><span style=\"font-size: 18px;\"><a name=\"_pwtgeogywbeq\"><\/a><strong>System Configuration<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><img decoding=\"async\" style=\"width: 452px; height: 330px; float: right;\" title=\"transformer connecton \" src=\"\/media\/115\/three-phase-transformer-connection-methods.webp\" alt=\"transformer connecton \" \/><span style=\"font-size: 18px;\">Transformers are typically connected depending on your application. However, be aware that how you configure your system can contribute to how your system reacts to\u00a0transformer inrush current.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">For instance, the delta-star connection could be more beneficial in controlling inrush current for transformer since the delta connection on the primary side can manage high current surge upon energization.\u00a0 <\/span><span style=\"font-size: 20px;\"><span style=\"color: #27ae60;\"><strong>More about <\/strong><\/span><strong><a href=\"https:\/\/www.daelimtransformer.com\/transformer-connection.html\"><span style=\"color: #c0392b;\">Transformer Connection<\/span><\/a><\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">On the contrary, some references show that the star-star connection could increase inrush current by up to <\/span><a style=\"font-size: 18px;\" href=\"https:\/\/voltage-disturbance.com\/power-engineering\/parameters-that-determine-transformer-inrush-current\/\" rel=\"noopener\">50%<\/a><span style=\"font-size: 18px;\">.<\/span><\/p>\n<p><a id=\"mdnTags8\" class=\"mdnTags\" name=\"mdn8\" data-index=\"8\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Controlled_SwitchingPoint_on_Wave_Switching\"><\/span><span style=\"font-size: 18px;\"><a name=\"_mp1qbx38gckz\"><\/a><strong>Controlled Switching\/Point on Wave Switching<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Another innovative way to deal with inrush current is to use controlled switching schemes. This method enhances the function of the circuit breaker using a Point on Wave switching device. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">This switching device is available in various types and models which can be used in <strong><a href=\"https:\/\/www.daelimtransformer.com\/power-transformer.html\"><span style=\"color: #27ae60;\">large\u00a0transformers<\/span><\/a><\/strong>. Moreover, the type of switching device to be used is highly dependent\u00a0on the type of circuit breaker your transformer has.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Most of these switching devices are designed to augment existing set-ups but they can be pre-integrated into the design as well.<\/span><\/p>\n<p><a id=\"mdnTags9\" class=\"mdnTags\" name=\"mdn9\" data-index=\"9\"><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><span style=\"font-size: 20px;\"><strong><a name=\"_usoex9u3avu4\"><\/a>FAQs<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a id=\"mdnTags10\" class=\"mdnTags\" name=\"mdn10\" data-index=\"10\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_the_Effects_of_Inrush_Current\"><\/span><span style=\"font-size: 18px;\"><a name=\"_gkgmx9qiu3vg\"><\/a><strong>What Are the Effects of Inrush Current?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Inrush current if not addressed could put your transformer and power system at great risk. This may include two or more of the following:<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_u20c2i29a6yd\"><\/a><strong>Voltage Drop<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">When the voltage level drops significantly, it will require all parts of the system to work harder than usual which can cause the system to burn out. This can also cause\u00a0power\u00a0interruptions and instability in the supply.<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_o3ryinamft6n\"><\/a><strong>Mechanical Stress<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">Certain levels of inrush current can cause excessive mechanical stress which can detrimentally shorten the lifespan of your transformer, circuitry, and other equipment within the system. <\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_e7yn1y5dh4kf\"><\/a><strong>Triggered Switches<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">Circuit breakers and other switches may detect the inrush current as an anomaly causing them to trip needlessly. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">This results in unwanted interruptions that highly affect the system&#8217;s overall efficiency. With that, some measures have to be taken such as upsizing the breaker.<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_ora37fxkw1fz\"><\/a><strong>Increase Downtime<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">If the inrush current is not properly addressed it can result in frequent transformer breakdowns or worse, total system failure which means shortened operations and additional time allocation for maintenance and repair.<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_duymwikp8fa3\"><\/a><strong>Vibrations<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">The strong surge of inrush current can cause the windings and other parts of the transformer to vibrate. These vibrations can also create noises which is a clear indication that there is something wrong with the system.<\/span><\/p>\n<p><a href=\"https:\/\/www.daelimtransformer.com\/ecodesign-transformers.html\"><img decoding=\"async\" style=\"width: 720px; height: 500px;\" title=\"tier-eco-transformer\" src=\"\/media\/115\/tier-eco-transformers.png\" alt=\"tier-eco-transformer\" \/><\/a><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_gjznbhk7f6i9\"><\/a><strong>Overloading<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">Inrush current can go beyond the designed capacity of the transformer. Ultimately, the transformer gets overloaded, overheats, and eventually, breaks down. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">More than the time\u00a0constraints, this may leave damage on the parts of the insulation and other thermal components which eventually lessen the life of your transformer.<\/span><\/p>\n<p><a id=\"mdnTags11\" class=\"mdnTags\" name=\"mdn11\" data-index=\"11\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Causes_Inrush_Current\"><\/span><span style=\"font-size: 18px;\"><a name=\"_3145kyc3936z\"><\/a><strong>What Causes Inrush Current?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Much like warming up, the transformer needs a lot of\u00a0power\u00a0to magnetize the core during start-up. The current level could reach its peak in a snap before it stabilizes.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">In addition, when the system is fully discharged, impedance is at its lowest. This temporarily allows large amounts of current to flow freely into the system.<\/span><\/p>\n<p><a id=\"mdnTags12\" class=\"mdnTags\" name=\"mdn12\" data-index=\"12\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_the_Types_of_Inrush_Currents\"><\/span><span style=\"font-size: 18px;\"><a name=\"_w1jn5o6eiilo\"><\/a><strong>What Are the Types\u00a0of Inrush Currents?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\"><a name=\"_on7fyznhco7t\"><\/a><strong>Sympathetic Inrush Current<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">This can take place when you power\u00a0a transformer in systems where there are two or more transformers actively connected to it.<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_ythy1jpovh2i\"><\/a><strong>Energization\u00a0Inrush Current <\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">This is the most commonly observed type of inrush current in most transformers the moment it is switched on after being idle. <\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_5lnwu7er1nre\"><\/a><strong>Recovery Inrush Current<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">This is observed when you restart a transformer subsequently after the voltage flow is momentarily cut off.<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_lshsox42pe9h\"><\/a><strong>Is Inrush Current Quantifyable?<\/strong><\/span><\/p>\n<p><span style=\"font-size: 18px;\">Yes, transformer inrush current can be measured. There are several options you can use to check the level of inrush current in your system. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">A multimeter with inrush features such as a clamp meter is one of the safest options. Another option would be using a high frequency oscilloscope and power analyzers.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">In large scale set-up, an automatic reading, software aided calculator, or measuring devices are also utilized.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Regardless of the method used, to avoid accidents, this shall be performed by professionals only. Safety electrical standards should also be strictly implemented.<\/span><\/p>\n<p><a id=\"mdnTags13\" class=\"mdnTags\" name=\"mdn13\" data-index=\"13\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_the_Things_To_Consider_When_Choosing_the_Suitable_Inrush_Current_Limiter\"><\/span><span style=\"font-size: 18px;\"><a name=\"_khf2esagerjx\"><\/a><strong>What Are the Things To Consider When Choosing the Suitable Inrush Current Limiter?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Basically, you need to know the specifications like the input voltage and maximum power output of your system. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">This also involves the calculation of the minimum resistance, steady state current, and total energy that will help you choose the most suitable inrush current limiter type or model.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Here are some of the useful formulas you can utilize for the inrush transformer calculations:<\/span><\/p>\n<p><strong><span style=\"font-size: 18px;\">1. R(Ohms)=1.414V<sub>Input<\/sub>(Volts)<\/span><span style=\"font-size: 11pt;\"><span style=\"line-height: 114%;\"><span style=\"font-family: Arial;\"><span style=\"font-size: 14.0000pt;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\">\u00f7 I( Amperes)<\/span><\/span><\/span><\/span><\/span><\/span><\/strong><\/p>\n<p><strong><span style=\"font-size: 18px;\">2. C<sub>ss<\/sub>(<\/span><span style=\"font-size: 11pt;\"><span style=\"line-height: 114%;\"><span style=\"font-family: Arial;\"><span style=\"font-size: 14.0000pt;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\">Amperes)=[P<sub>output<\/sub>\u00a0\u00f7\u00a0<\/span><\/span><\/span><\/span><\/span><\/span><span style=\"font-size: 18px;\">V<sub>Input<\/sub>(Volts)]\u00a0<\/span><span style=\"font-size: 11pt;\"><span style=\"line-height: 114%;\"><span style=\"font-family: Arial;\"><span style=\"font-size: 14.0000pt;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\">\u00d7 90% Efficiency<\/span><\/span><\/span><\/span><\/span><\/span><\/strong><\/p>\n<p><strong><span style=\"font-size: 18px;\">3.\u00a0 E<sub>Total<\/sub>(Joules) = 1\/2[C(uF)\u00a0<\/span><span style=\"font-size: 11pt;\"><span style=\"line-height: 114%;\"><span style=\"font-family: Arial;\"><span style=\"font-size: 14.0000pt;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\"><span style=\"font-family: \u5fae\u8f6f\u96c5\u9ed1;\">\u00d7 V<sup>2<\/sup><sub>Peak<\/sub><\/span><\/span><\/span><\/span><\/span><\/span><span style=\"font-size: 18px;\">(Volts)]<\/span><\/strong><\/p>\n<p><span style=\"font-size: 18px;\">Where,<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0R = Minimum Resistance<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0VInput\u00a0= Input Voltage<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0I = Max Allowable Inrush Current<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0CSS = Steady State Current<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0P \u00a0= Output Power<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0ETotal \u00a0= Total Energy \u00a0\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0C = Capacitance<\/span><\/p>\n<p><span style=\"font-size: 18px;\">\u00a0\u00a0\u00a0\u00a0\u00a0VPeak \u00a0\u00a0= Peak Voltage \u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Although calculations can be simple, note that a professional background and proper understanding of these electrical systems are still required for you to get the desired results.<\/span><\/p>\n<p><a id=\"mdnTags14\" class=\"mdnTags\" name=\"mdn14\" data-index=\"14\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_Are_the_Factors_That_May_Dictate_Inrush_Current\"><\/span><span style=\"font-size: 18px;\"><a name=\"_12ne2p25mj5y\"><\/a><strong>What Are the Factors\u00a0That May Dictate Inrush Current?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\"><a name=\"_uqgm6y4dpzvy\"><\/a>Transformer Size<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Inrush current in a small transformer is more likely tolerable than those that occur when powering a large transformer. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">Large transformers have larger cores, thus they require a large intake of the rushing current to charge the core. <\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_gmbvd06y0dbw\"><\/a>Residual Flux<\/span><\/p>\n<p><span style=\"font-size: 18px;\">Transformers with residual flux tend to have the highest inrush current as compared to a transformer starting from zero.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">This is very relative to the starting point and how much\u00a0time\u00a0is left before it reaches the saturation point.<\/span><\/p>\n<p><span style=\"font-size: 18px;\"><a name=\"_hytr9xwamnkd\"><\/a>Other Factors<\/span><\/p>\n<p><span style=\"font-size: 18px;\">This includes the significant features of the transformer such as the design, the core size, and the number of turns.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">The power\u00a0surge observed upon\u00a0energization is another factor that determines how bad an inrush current can go.<\/span><\/p>\n<p><a id=\"mdnTags15\" class=\"mdnTags\" name=\"mdn15\" data-index=\"15\"><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_Terrible_Can_a_Transformer_Inrush_Current_Be\"><\/span><span style=\"font-size: 18px;\"><a name=\"_82fj1po7omg5\"><\/a><strong>How Terrible Can a Transformer Inrush Current Be?<\/strong><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span style=\"font-size: 18px;\">Inrush current for transformer severity and duration\u00a0is determined by various factors. Depending on these factors, the inrush current could reach great levels.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">For example, if you have a large transformer plus the presence of residual flux in the core, these amplify the intensity of the inrush current. Expect the inrush current to be ten to <a href=\"https:\/\/electrical-engineering-portal.com\/the-worst-transformer-inrush-current-occurs-when\" rel=\"noopener\">forty<\/a>\u00a0times higher than the full operating current.<\/span><\/p>\n<p><a id=\"mdnTags16\" class=\"mdnTags\" name=\"mdn16\" data-index=\"16\"><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Do_You_Need_Help_in_Managing_Transformer_Inrush_Current\"><\/span><span style=\"font-size: 18px;\"><a name=\"_el388rqujas\"><\/a><strong>Do You Need Help in Managing Transformer Inrush Current?<\/strong> <\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong><span style=\"font-size: 18px;\">\u00a0 \u00a0<span style=\"color: #27ae60;\"> Mitigate Transformer Inrush Current With Daelim Transformer<\/span><\/span><\/strong><\/p>\n<p><iframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/48PRtARm8ek?si=PtaCSbhB2RIqFnf6\" width=\"100%\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><span style=\"font-size: 18px;\">An effective transformer inrush current management does not only mean knowing how to control it but also knowing how to equip your transformer to withstand its effects. With proper design and safety measures in place, you can achieve a solid power\u00a0system. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">Daelim is a duly certified<a href=\"https:\/\/www.daelimtransformer.com\/certificate.html\"><strong><span style=\"color: #990033;\"> ISO, CSA, CESI, CNAS, and UL\/cUL<\/span><\/strong><\/a> manufacturer which has been a trusted partner in delivering robust and <strong><a href=\"https:\/\/www.daelimtransformer.com\/all-products.html\"><span style=\"color: #8e44ad;\">high quality transformers<\/span><\/a><\/strong> around the globe with the ultimate goal of ensuring the reliability of transformers in every power\u00a0system.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">At Daelim, transformers are properly equipped with safety protection\u00a0devices and designed to deliver efficient and optimum performance. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">Each unit undergoes rigorous testing such as the impact test which validates the mechanical strength and integrity of the transformer.<\/span><\/p>\n<p><span style=\"font-size: 18px;\">With over 20 years of expertise in transformer design, Daelim Transformer can offer diverse strategies and professional guidance on transformer inrush current. <\/span><\/p>\n<p><span style=\"font-size: 18px;\">Still worried about transformer inrush current? Daelim Transformer is here to listen. <strong><a href=\"https:\/\/www.daelimtransformer.com\/contact.html\"><span style=\"color: #27ae60;\">Get in touch with Daelim Transformer<\/span><\/a><\/strong> to consult with some of our experienced and knowledgeable professionals today.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this article, we will tackle inrush current for transformers including some of the most modern ways how to avoid\u00a0and effectively handle inrush current. We will also discuss how it affects your electrical system and answer more FAQs surrounding transformer inrush\u00a0current. Have you ever wondered why the power suddenly cuts off when you turn on [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7557,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[279],"tags":[],"class_list":["post-7556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/posts\/7556","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/comments?post=7556"}],"version-history":[{"count":0,"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/posts\/7556\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/media\/7557"}],"wp:attachment":[{"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/media?parent=7556"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/categories?post=7556"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.daelimtransformer.com\/de\/wp-json\/wp\/v2\/tags?post=7556"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}