{"id":6033,"date":"2026-09-14T04:57:03","date_gmt":"2026-09-14T04:57:03","guid":{"rendered":"https:\/\/lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/"},"modified":"2026-09-14T04:57:03","modified_gmt":"2026-09-14T04:57:03","slug":"a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2","status":"publish","type":"post","link":"https:\/\/www.lstransformer.com\/fr\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/","title":{"rendered":"Un Loud “Coup” Lors de la Commutation Sur un Transformateur: Est-Il Endommag\u00e9?"},"content":{"rendered":"

Transformers are vital components in power systems, and their stable operation is crucial. When energizing a transformer after installation or maintenance, you might sometimes hear a significant humming noise or a loud “bang.” This phenomenon, possible in power operations worldwide, often raises concerns among operators: does it indicate a fault or damage to the transformer? This article delves into the root causes, helping you distinguish between a normal physical event and a potential warning sign.<\/span><\/p>\n

 \"substation\"<\/span><\/p>\n

1. Main Cause of the Switching Noise: Inrush Current<\/span><\/b><\/b><\/h3>\n

The most common cause of the loud noise is the inrush current or magnetizing inrush current. This is a transient, high-magnitude current surge\u2014far exceeding the rated current\u2014that flows into the primary winding when a transformer is switched onto the power grid in a no-load state (without connected load).<\/span><\/p>\n

1.1 How Inrush Current Happens<\/span><\/b><\/b><\/h4>\n

Transformers work on the principle of electromagnetic induction. During steady-state operation, the magnetic flux (\u03a6) in the core closely follows the applied voltage (V). However, at the exact moment of switching, this balance is disrupted.<\/span><\/p>\n

1.1.1 The Transient Process of Flux Establishment<\/span><\/b><\/b><\/h5>\n

The AC voltage is a sine wave. The instant of switching (the voltage phase angle) is critical for the initial establishment of magnetic flux. According to Faraday’s law:<\/span><\/p>\n

V = N(d\u03a6\/dt)<\/span><\/b><\/b><\/p>\n

where V is instantaneous voltage<\/span><\/p>\n

 N is turns<\/span><\/p>\n

 d\u03a6\/dt is the rate of change of flux.<\/span><\/p>\n

 <\/span><\/p>\n

The Key Point:<\/span><\/b>If the switch closes precisely at the voltage zero-crossing (instantaneous voltage is 0), the required rate of change of flux (d\u03a6\/dt) must also be zero. However, the core flux needs to start from zero. To “catch up” with the steady-state flux waveform corresponding to the voltage, the system creates a large transient flux offset. Establishing this offset requires a very large instantaneous current in the winding\u2014this is the inrush current.<\/span><\/p>\n

 <\/span><\/p>\n

1.2 Physical Effects and the Resulting Sound<\/span><\/b><\/b><\/h4>\n

This instantaneous current, which can be 6-10 times the rated current, triggers strong physical effects inside the transformer:<\/span><\/p>\n

(1)<\/font><\/span><\/b>Intense Electromagnetic Forces:<\/span><\/b>The high current creates a powerful magnetic field around the windings, subjecting the winding conductors and core structural parts to significant mechanical stress, causing tiny, instantaneous displacements or vibrations.<\/span><\/p>\n

(2)<\/font><\/span><\/b>Core Magnetostriction:<\/span><\/b>Transformer cores are made of laminated silicon steel. Under the intense, changing magnetic field, the core material exhibits “magnetostriction,” meaning its physical dimensions change minutely with magnetic field strength.<\/span><\/p>\n

(3)<\/font><\/span><\/b>Sound Generation:<\/span><\/b>The structural vibrations from electromagnetic forces combine with vibrations from core magnetostriction. These vibrations, with rich frequency content, are amplified by the tank, radiators, etc., and are released as an audible “bang,” “boom,” or humming noise.<\/span><\/p>\n

 <\/span><\/p>\n\n\n\n\n\n\n\n\n
\n

Characteristic<\/span><\/p>\n<\/td>\n

\n

Typical Value \/ Description<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Peak Magnitude<\/span><\/p>\n<\/td>\n

\n

Up to 6-10 times rated current<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Duration<\/span><\/p>\n<\/td>\n

\n

Typically several power cycles (tens to hundreds of milliseconds)<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Decay Rate<\/span><\/p>\n<\/td>\n

\n

Fast decay to steady-state no-load current (depends on system impedance & transformer design)<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Main Physical Effects<\/span><\/p>\n<\/td>\n

\n

Electromagnetic mechanical forces, Core magnetostriction<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Typical Sound<\/span><\/p>\n<\/td>\n

\n

A single or short series of “bang,” “boom,” or “thud” sounds<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/span><\/p>\n

Table 1: Transformer Inrush Current Characteristics & Impact<\/span><\/b><\/b><\/p>\n

 <\/span><\/p>\n

2. Distinguishing Normal Inrush Noise from Fault Indicators<\/span><\/b><\/b><\/h3>\n

While most loud noises are due to normal transformer inrush current, certain abnormal sounds can signal problems. Knowing how to differentiate is key.<\/span><\/p>\n

 <\/span><\/p>\n

2.1 Characteristics of Normal Inrush Noise<\/span><\/b><\/b><\/h4>\n

(1)<\/font><\/span><\/b>Timing:<\/span><\/b>Occurs strictly at the moment of switching on. The sound is brief (usually ends within 1-2 seconds).<\/span><\/p>\n

(2)<\/font><\/span><\/b>Nature:<\/span><\/b>A single “boom” or a short series of “bangs” that quickly subsides. Afterward, the transformer runs with a uniform, steady hum.<\/span><\/p>\n

(3)<\/font><\/span><\/b>No Other Symptoms:<\/span><\/b>After the sound, there is no persistent abnormal noise, no unusual smoke or gas emission, and no protective device operation (e.g., relays do not trip).<\/span><\/p>\n

 <\/span><\/p>\n

2.2 Characteristics of Abnormal Sounds Indicating Potential Faults<\/span><\/b><\/b><\/h4>\n

If the following sound patterns occur during or after switching, it may indicate an issue:<\/span><\/p>\n

2.2.1 Sounds from Internal Electrical Faults<\/span><\/b><\/b><\/h5>\n

e.g., inter-turn winding shorts, severe internal discharge. Sounds may mix with inrush noise but have differences:<\/span><\/p>\n

(1)<\/font><\/span>Sharp cracking or continuous arcing\/discharge sounds:<\/span>May accompany internal insulation breakdown.<\/span><\/p>\n

(2)<\/font><\/span>Accompanied by protection trips:<\/span>Often causes rapid operation of overcurrent, differential, or gas (Buchholz) relays, tripping the circuit.<\/span><\/p>\n

(3)<\/font><\/span>Persistence:<\/span>The fault and associated sound\/vibration typically do not quickly subside like inrush effects.<\/span><\/p>\n

 <\/span><\/p>\n

2.2.2 Sounds from Mechanical Issues<\/span><\/b><\/b><\/h5>\n

e.g., poor core grounding, loose clamping structures excited by the large inrush forces.<\/span><\/p>\n

(1)<\/font><\/span>Persistent, rhythmic vibrating or knocking sounds:<\/span>Abnormal, rhythmic “ticking,” “clicking,” or uneven “buzzing” persists during steady-state operation after switching.<\/span><\/p>\n

(2)<\/font><\/span>Localized sound:<\/span>Sometimes the sound source can be traced by listening near different parts of the transformer, indicating a local mechanical problem.<\/span><\/p>\n

 <\/span><\/p>\n\n\n\n\n\n\n\n\n
\n

Aspect<\/span><\/b><\/b><\/p>\n<\/td>\n

\n

Normal Inrush Sound<\/span><\/b><\/b><\/p>\n<\/td>\n

\n

Suspected Fault Sound<\/span><\/b><\/b><\/p>\n<\/td>\n<\/tr>\n

\n

Timing<\/span><\/p>\n<\/td>\n

\n

Strictly at switch-on moment<\/span><\/p>\n<\/td>\n

\n

May occur at switch-on, but more often persists or recurs afterward<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Sound Quality<\/span><\/p>\n<\/td>\n

\n

Low-pitched “boom,” brief<\/span><\/p>\n<\/td>\n

\n

Sharp crackle, continuous arcing sound, rhythmic knocking\/vibration<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Duration<\/span><\/p>\n<\/td>\n

\n

Disappears completely within seconds<\/span><\/p>\n<\/td>\n

\n

Persists or occurs intermittently<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Accompanying Electrical Signs<\/span><\/p>\n<\/td>\n

\n

No protection trip; meters return to normal<\/span><\/p>\n<\/td>\n

\n

Often protective trips, sustained abnormal meter readings, sudden changes in online DGA data<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Subsequent Operation<\/span><\/p>\n<\/td>\n

\n

Sound immediately returns to uniform steady hum<\/span><\/p>\n<\/td>\n

\n

Operational noise remains abnormally loud or unstable<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Table 2: Guide to Identifying Transformer Switching Sounds<\/span><\/p>\n

 <\/span><\/p>\n

3. How to Manage & Mitigate Inrush Current and Its Effects<\/span><\/b><\/b><\/h3>\n

Even if the noise is normal, high inrush current poses potential stress to the grid and the transformer itself (e.g., voltage dips, risk of relay misoperation). The following internationally adopted measures can help manage it.<\/span><\/p>\n

3.1 Operational Measure: Controlled Switching (Phase Control)<\/span><\/b><\/b><\/h4>\n

(1)<\/font><\/span><\/b>Principle:<\/span><\/b>As explained, inrush magnitude depends directly on the voltage phase angle at switch-on. Theoretically, switching at the voltage peak results in the smallest inrush.<\/span><\/p>\n

(2)<\/font><\/span><\/b>Action:<\/span><\/b>Use synchronous (point-on-wave) controllers or smart circuit breakers to precisely close the contacts at a specific point on the voltage waveform (near the peak).<\/span><\/p>\n

(3)<\/font><\/span><\/b>Effect:<\/span><\/b>Can reduce inrush current peaks by over 50%, significantly dampening the noise and electromagnetic stress.<\/span><\/p>\n

 <\/span><\/p>\n

3.2 Device-Level Measures: Remanence Management or Series Resistor<\/span><\/b><\/b><\/h4>\n
3.2.1<\/font><\/span><\/b>Remanence Management:<\/span><\/b><\/b><\/h5>\n

(1)<\/font><\/span>Principle:<\/span>After de-energization, the core may retain some magnetic flux (remanence). If the “target flux” from the switching voltage is opposite to the remanence direction, they add up, worsening the flux offset and inrush. Actively managing remanence (e.g., bringing it to zero or knowing its state before switching) aids optimal switching strategy.<\/span><\/p>\n

(2)<\/font><\/span>Effect:<\/span>Reduces unpredictability and, combined with phase control, optimizes switching.<\/span><\/p>\n

 <\/span><\/p>\n

3.2.2<\/font><\/span><\/b>Pre-insertion Resistors:<\/span><\/b><\/b><\/h5>\n

(1)<\/font><\/span>Principle:<\/span>Before the main breaker contacts close, auxiliary contacts with a series resistor close first. The resistor limits the initial current, allowing flux to build up smoothly. After a brief delay, the main contacts close, shorting the resistor.<\/span><\/p>\n

(2)<\/font><\/span>Effect:<\/span>Physically limits the initial current peak; a very effective method for large HV transformers.<\/span><\/p>\n

 <\/span><\/p>\n

3.3 System Design Measures: Inrush Current Limiters & Protection Logic<\/span><\/b><\/b><\/h4>\n

(1)<\/font><\/span><\/b>Inrush Current Limiters:<\/span><\/b>Specially designed inductive or non-linear resistive devices temporarily connected to the circuit to suppress the peak.<\/span><\/p>\n

(2)<\/font><\/span><\/b>Protection Relay Setting Optimization:<\/span><\/b>Adjusting the harmonic restraint settings in differential or overcurrent relays helps them better distinguish between inrush current (rich in 2nd harmonic) and genuine fault current, preventing nuisance trips.<\/span><\/p>\n

 \"\u6a2a\u7248\"<\/span><\/p>\n

Conclusion & Recommendation<\/span><\/b><\/b><\/h3>\n

Hearing a loud bang when switching on a transformer is no immediate cause for panic. It is most likely due to inrush current\u2014a strong but generally normal physical phenomenon. However, a responsible operator must have the ability to discriminate. Monitor for the warning signs listed above. If in doubt, or if abnormal symptoms persist, consult a qualified professional for inspection. Proper understanding and management of transformer energization ensure both safety and reliability.<\/span><\/p>\n

<\/span><\/p>\n

LuShan<\/span>, est.<\/span>1975<\/span>, is a Chinese professional manufacturer specializing in power transformers and reactors for<\/span>50+<\/font><\/span>years. Leading products are<\/span>single-phase transformer, three-phase<\/span>isolation<\/span>transformers,electrical transformer<\/span>,distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer;<\/font><\/span>DC inductors, AC reactors, filtering reactor, line and load reactor, chokes, filtering reactor, and intermediate,high-frequency products.<\/span><\/p>\n


<\/span><\/p>\n

 <\/span><\/p>\n

Contact us<\/span><\/b><\/h3>\n

Our power<\/span>transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering(furnace), central air conditioning.<\/span><\/p>\n

 <\/span><\/p>\n

Know more about power transformer and reactor :<\/span>www.lstransformer.com<\/span><\/u>.<\/font><\/span><\/u><\/p>\n

 <\/span><\/p>\n

If you would like to obtain customized solutions for transformers or reactors, please contact us.<\/span><\/p>\n

WhatsApp<\/span>\uff1a<\/span>+86<\/span>13787095096<\/span>
<\/span>Email:[email protected]<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Transformers are vital components in power systems, and their stable operation is crucial. When energizing a transformer after installation or maintenance, you might sometimes hear a significant humming noise or a loud “bang.” This phenomenon, possible in power operations worldwide, often raises concerns among operators: does it indicate a fault or damage to the transformer? […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[],"tags":[],"class_list":["post-6033","post","type-post","status-publish","format-standard","hentry"],"yoast_head":"\nA Loud "Bang" When Switching On a Transformer: Is It Damaged? - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD<\/title>\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.lstransformer.com\/fr\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Loud "Bang" When Switching On a Transformer: Is It Damaged? - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD\" \/>\n<meta property=\"og:description\" content=\"Transformers are vital components in power systems, and their stable operation is crucial. When energizing a transformer after installation or maintenance, you might sometimes hear a significant humming noise or a loud “bang.” This phenomenon, possible in power operations worldwide, often raises concerns among operators: does it indicate a fault or damage to the transformer? […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.lstransformer.com\/fr\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/\" \/>\n<meta property=\"og:site_name\" content=\"LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-14T04:57:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.lstransformer.com\/upload\/news\/1780364720486989.png\" \/>\n<meta name=\"author\" content=\"xiangligougou\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"xiangligougou\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/\"},\"author\":{\"name\":\"xiangligougou\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#\\\/schema\\\/person\\\/4aa28de58bbcbc630401c966317223d3\"},\"headline\":\"A Loud “Bang” When Switching On a Transformer: Is It Damaged?\",\"datePublished\":\"2026-09-14T04:57:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/\"},\"wordCount\":1372,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.lstransformer.com\\\/upload\\\/news\\\/1780364720486989.png\",\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/\",\"url\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/\",\"name\":\"A Loud \\\"Bang\\\" When Switching On a Transformer: Is It Damaged? - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.lstransformer.com\\\/upload\\\/news\\\/1780364720486989.png\",\"datePublished\":\"2026-09-14T04:57:03+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.lstransformer.com\\\/upload\\\/news\\\/1780364720486989.png\",\"contentUrl\":\"https:\\\/\\\/www.lstransformer.com\\\/upload\\\/news\\\/1780364720486989.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\\\/\\\/www.lstransformer.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"A Loud “Bang” When Switching On a Transformer: Is It Damaged?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#website\",\"url\":\"https:\\\/\\\/www.lstransformer.com\\\/\",\"name\":\"LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.lstransformer.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#organization\",\"name\":\"LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD\",\"url\":\"https:\\\/\\\/www.lstransformer.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.lstransformer.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/cropped-7e09bd7bad9c830e0d75b8487b0d77c3-1.webp\",\"contentUrl\":\"https:\\\/\\\/www.lstransformer.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/cropped-7e09bd7bad9c830e0d75b8487b0d77c3-1.webp\",\"width\":760,\"height\":202,\"caption\":\"LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD\"},\"image\":{\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.lstransformer.com\\\/#\\\/schema\\\/person\\\/4aa28de58bbcbc630401c966317223d3\",\"name\":\"xiangligougou\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/9cd84f27b57f8e0da2e8f59e38e2e665ad012e9ffc89a7182019a98e9590337b?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/9cd84f27b57f8e0da2e8f59e38e2e665ad012e9ffc89a7182019a98e9590337b?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/9cd84f27b57f8e0da2e8f59e38e2e665ad012e9ffc89a7182019a98e9590337b?s=96&d=mm&r=g\",\"caption\":\"xiangligougou\"},\"sameAs\":[\"https:\\\/\\\/lstransformer.com\"],\"url\":\"https:\\\/\\\/www.lstransformer.com\\\/fr\\\/author\\\/xiangligougou\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Un grand \"Bang\" Lors de la Commutation Sur un Transformateur: Est-Il Endommag\u00e9? - LS transformateur de puissance, r\u00e9acteur de Ligne \u00e0 Haute tension transformateur d'Huile de transformateur immerg\u00e9-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.lstransformer.com\/fr\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/","og_locale":"fr_FR","og_type":"article","og_title":"A Loud \"Bang\" When Switching On a Transformer: Is It Damaged? - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","og_description":"Transformers are vital components in power systems, and their stable operation is crucial. When energizing a transformer after installation or maintenance, you might sometimes hear a significant humming noise or a loud “bang.” This phenomenon, possible in power operations worldwide, often raises concerns among operators: does it indicate a fault or damage to the transformer? […]","og_url":"https:\/\/www.lstransformer.com\/fr\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/","og_site_name":"LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","article_published_time":"2026-09-14T04:57:03+00:00","og_image":[{"url":"https:\/\/www.lstransformer.com\/upload\/news\/1780364720486989.png","type":"","width":"","height":""}],"author":"xiangligougou","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"xiangligougou","Dur\u00e9e de lecture estim\u00e9e":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#article","isPartOf":{"@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/"},"author":{"name":"xiangligougou","@id":"https:\/\/www.lstransformer.com\/#\/schema\/person\/4aa28de58bbcbc630401c966317223d3"},"headline":"A Loud “Bang” When Switching On a Transformer: Is It Damaged?","datePublished":"2026-09-14T04:57:03+00:00","mainEntityOfPage":{"@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/"},"wordCount":1372,"commentCount":0,"publisher":{"@id":"https:\/\/www.lstransformer.com\/#organization"},"image":{"@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#primaryimage"},"thumbnailUrl":"https:\/\/www.lstransformer.com\/upload\/news\/1780364720486989.png","inLanguage":"fr-FR","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/","url":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/","name":"Un grand \"Bang\" Lors de la Commutation Sur un Transformateur: Est-Il Endommag\u00e9? - LS transformateur de puissance, r\u00e9acteur de Ligne \u00e0 Haute tension transformateur d'Huile de transformateur immerg\u00e9-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","isPartOf":{"@id":"https:\/\/www.lstransformer.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#primaryimage"},"image":{"@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#primaryimage"},"thumbnailUrl":"https:\/\/www.lstransformer.com\/upload\/news\/1780364720486989.png","datePublished":"2026-09-14T04:57:03+00:00","breadcrumb":{"@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#primaryimage","url":"https:\/\/www.lstransformer.com\/upload\/news\/1780364720486989.png","contentUrl":"https:\/\/www.lstransformer.com\/upload\/news\/1780364720486989.png"},{"@type":"BreadcrumbList","@id":"https:\/\/www.lstransformer.com\/a-loud-bang-when-switching-on-a-transformer-is-it-damaged-2\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.lstransformer.com\/"},{"@type":"ListItem","position":2,"name":"A Loud “Bang” When Switching On a Transformer: Is It Damaged?"}]},{"@type":"WebSite","@id":"https:\/\/www.lstransformer.com\/#website","url":"https:\/\/www.lstransformer.com\/","name":"LS transformateur de puissance, r\u00e9acteur de Ligne \u00e0 Haute tension transformateur d'Huile de transformateur immerg\u00e9-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","description":"","publisher":{"@id":"https:\/\/www.lstransformer.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.lstransformer.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Organization","@id":"https:\/\/www.lstransformer.com\/#organization","name":"LS transformateur de puissance, r\u00e9acteur de Ligne \u00e0 Haute tension transformateur d'Huile de transformateur immerg\u00e9-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD","url":"https:\/\/www.lstransformer.com\/","logo":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.lstransformer.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.lstransformer.com\/wp-content\/uploads\/2026\/06\/cropped-7e09bd7bad9c830e0d75b8487b0d77c3-1.webp","contentUrl":"https:\/\/www.lstransformer.com\/wp-content\/uploads\/2026\/06\/cropped-7e09bd7bad9c830e0d75b8487b0d77c3-1.webp","width":760,"height":202,"caption":"LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD"},"image":{"@id":"https:\/\/www.lstransformer.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/www.lstransformer.com\/#\/schema\/person\/4aa28de58bbcbc630401c966317223d3","name":"xiangligougou","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/secure.gravatar.com\/avatar\/9cd84f27b57f8e0da2e8f59e38e2e665ad012e9ffc89a7182019a98e9590337b?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9cd84f27b57f8e0da2e8f59e38e2e665ad012e9ffc89a7182019a98e9590337b?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9cd84f27b57f8e0da2e8f59e38e2e665ad012e9ffc89a7182019a98e9590337b?s=96&d=mm&r=g","caption":"xiangligougou"},"sameAs":["https:\/\/lstransformer.com"],"url":"https:\/\/www.lstransformer.com\/fr\/author\/xiangligougou\/"}]}},"_links":{"self":[{"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/posts\/6033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/comments?post=6033"}],"version-history":[{"count":1,"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/posts\/6033\/revisions"}],"predecessor-version":[{"id":7170,"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/posts\/6033\/revisions\/7170"}],"wp:attachment":[{"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/media?parent=6033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/categories?post=6033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lstransformer.com\/fr\/wp-json\/wp\/v2\/tags?post=6033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}