{"id":1197,"date":"2026-07-22T05:33:00","date_gmt":"2026-07-22T05:33:00","guid":{"rendered":"https:\/\/lstransformer.com\/temperature-rise-limits-of-dry-type-transformers-vs-oil-immersed-transformers-key-differences\/"},"modified":"2026-09-26T12:36:18","modified_gmt":"2026-09-26T12:36:18","slug":"temperature-rise-limits-of-dry-type-transformers-vs-oil-immersed-transformers-key-differences","status":"publish","type":"post","link":"https:\/\/www.lstransformer.com\/es\/temperature-rise-limits-of-dry-type-transformers-vs-oil-immersed-transformers-key-differences\/","title":{"rendered":"Temperature Rise Limits of Dry-Type Transformers vs. Oil-Immersed Transformers: Key Differences"},"content":{"rendered":"

Temperature Rise Limits of Dry-Type Transformers vs. Oil-Immersed Transformers: Key Differences<\/b><\/h1>\n

In power systems, transformers are the core equipment for energy conversion and distribution, and their performance and reliability directly impact the safety of the grid. During operation, transformers generate heat, making temperature rise a critical performance indicator. Due to differences in cooling methods, dry-type transformers and oil-immersed transformers exhibit significant variations in their temperature rise limits. This article provides a detailed analysis of the standards, influencing factors, and underlying technical principles of these limits, helping power engineers, procurement professionals, and industry practitioners better understand this key parameter.<\/p>\n

Globally, standards organizations such as IEEE, IEC, and ANSI have clearly defined temperature rise limits for transformers. By comparing these standards, we can better determine the most suitable transformer for different scenarios.<\/p>\n

Contenido<\/span><\/b><\/b><\/h2>\n

1. Definition and Importance of Temperature Rise Limits<\/em><\/b><\/h3>\n
(1) Temperature rise refers to the difference between the internal temperature of a transformer under rated load and the ambient temperature. <\/strong><\/h6>\n

For example, if the ambient temperature is 30\u00b0C and the winding temperature is 110\u00b0C, the temperature rise is 80K (note: the unit is Kelvin, K, not Celsius, \u00b0C).<\/p>\n

\u0394\u03b8 = Tmeasured \u2212 Tambient<\/b><\/p>\n

Example: Ambient temperature 40\u00b0C, winding temperature 110\u00b0C \u2192 Temperature rise = 70K.<\/p>\n

(2) Why is controlling temperature rise critical for system survival?<\/strong><\/i><\/h6>\n\n\n\n\n\n\n
Impact Dimension<\/b><\/td>\nMechanism<\/b><\/td>\nQuantified Consequences<\/b><\/td>\n<\/tr>\n
Insulation Aging<\/td>\nFollows Arrhenius Law: For every 8-10\u00b0C increase, insulation life halves.<\/td>\nH-class insulation at 180\u00b0C lasts 10 years \u2192 At 190\u00b0C, life reduces to 5 years (IEEE 98 Report).<\/td>\n<\/tr>\n
Load Capacity<\/td>\nExceeding temperature rise triggers thermal protection, forcing derating.<\/td>\nOil-filled transformers exceeding 5K see capacity drop \u22653% (IEC 60076-7).<\/td>\n<\/tr>\n
Failure Risk<\/td>\nDry-type: Epoxy resin carbonization \u2192 Short circuit; Oil-filled: Oil decomposition \u2192 Explosive gas formation.<\/td>\n>65% of transformer failures originate from overheating (CIGRE statistics).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

2. Temperature Rise Limits for Dry-Type Transformers<\/em><\/b><\/h3>\n

Dry-type transformers rely on air cooling, with insulation systems typically made of epoxy resin or Nomex\u00ae paper. Due to air’s lower specific heat capacity and thermal conductivity, dry-type transformers have weaker heat dissipation, resulting in lower temperature rise limits.<\/p>\n

According to IEC 60076-11 and IEEE C57.12.01, the temperature rise limits for dry-type transformers are as follows:<\/p>\n\n\n\n\n\n\n\n\n
Clase De Aislamiento<\/b><\/td>\nWinding Temperature Rise Limit (K)<\/b><\/td>\nHotspot Temperature Limit (\u00b0C)<\/b><\/td>\nAplicaciones T\u00edpicas<\/b><\/td>\n<\/tr>\n
A (105)<\/td>\n60<\/td>\n105<\/td>\nOlder equipment<\/td>\n<\/tr>\n
E (120)<\/td>\n75<\/td>\n120<\/td>\nRarely used<\/td>\n<\/tr>\n
B (130)<\/td>\n80<\/td>\n130<\/td>\nGeneral-purpose<\/td>\n<\/tr>\n
F (155)<\/td>\n100<\/td>\n155<\/td>\nHigh-load demand<\/td>\n<\/tr>\n
H (180)<\/td>\n125<\/td>\n180<\/td>\nHigh-temperature environments<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

2.1 Why are dry-type transformer limits lower?<\/strong><\/h4>\n

Dry-type transformers depend on air convection for cooling, and air’s thermal conductivity (0.026 W\/m\u00b7K) is far lower than transformer oil (0.12 W\/m\u00b7K). To ensure insulation longevity, temperature rise limits must be strictly controlled. For example, an F-class (155\u00b0C) dry-type transformer allows a 100K rise but is often operated below 80K for reliability.<\/p>\n

2.2 Temperature rise calculation model for dry-type transformers<\/strong><\/h4>\n

Temperature rise correlates exponentially with load:<\/p>\n

\u0394\u03b8 = \u0394\u03b8R \u00d7 (I\/IR)^1.6<\/b><\/p>\n

\u0394\u03b8R: Rated temperature rise (e.g., 100K)<\/p>\n

I\/IR: Load ratio<\/i><\/p>\n

Example:An F-class dry-type transformer at 120% load:
\nTemperature rise = 100 \u00d7 (1.2)^1.6 \u2248 135K (exceeds limit by 35%).<\/p>\n

2.3 Maintenance tips<\/strong><\/i><\/h4>\n
(1)Spacing:Keep \u2265300mm from walls (\u2265150mm for forced convection).<\/strong><\/h6>\n
(2)Cleanliness:\u00a0Dust buildup reduces cooling efficiency by 15-30%.<\/strong><\/h6>\n
(3)Overloading:\u00a0Limit to \u22643 daily overloads, spaced >4 hours apart (to avoid heat accumulation).<\/strong><\/h6>\n

\"3\"<\/a><\/p>\n

3. Temperature Rise Limits for Oil-Immersed Transformers<\/em><\/b><\/h3>\n

Oil-immersed transformers use mineral oil or synthetic esters for cooling and insulation. Oil’s high specific heat capacity and forced circulation (e.g., ONAN\/ONAF\/OFAF cooling) enable superior heat dissipation, allowing higher temperature rise limits.<\/p>\n

Per IEC 60076-2 and ANSI C57.12.00, oil-immersed transformer limits are:<\/p>\n\n\n\n\n\n\n
Par\u00e1metro<\/b><\/td>\nTemperature Rise Limit (K)<\/b><\/td>\nNotas<\/b><\/td>\n<\/tr>\n
Winding (avg.)<\/td>\n65 (resistance method)<\/td>\nTypical for distribution transformers.<\/td>\n<\/tr>\n
Top oil<\/td>\n55<\/td>\nPrevents oil degradation.<\/td>\n<\/tr>\n
Hotspot<\/td>\n78<\/td>\nCritical limiting factor.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

3.1 Why higher limits for oil-immersed transformers?<\/strong><\/h4>\n
(1)Oil\u2019s cooling efficiency:\u00a0Thermal conductivity (0.12 W\/m\u00b7K) is 5\u00d7 higher than air.<\/strong><\/h6>\n
(2)Thermal stability:\u00a0High-quality oil withstands >100\u00b0C long-term without breakdown.<\/strong><\/h6>\n
(3)Forced cooling:\u00a0Large units use fans (ONAF) or oil pumps (OFAF) to further reduce temperature rise.<\/strong><\/h6>\n

\"2\"<\/a><\/p>\n

4. Key Factors Influencing Temperature Rise<\/em><\/b><\/h3>\n

4.1 Load profile<\/strong><\/h4>\n
(1) Continuous load:Temperature stabilizes near design limits.<\/strong><\/h6>\n
(2)Intermittent load:Short overloads may be buffered by thermal time constants (\u03c4 = 30-120 min), but must comply with IEC 60354 guidelines.<\/strong><\/h6>\n
4.1.1 Tiered limits<\/strong><\/h5>\n\n\n\n\n\n\n
Monitoring Point<\/td>\nRise Limit (K)<\/td>\nAbsolute Limit (\u00b0C)<\/td>\nMeasurement Method<\/td>\n<\/tr>\n
Winding (avg.)<\/td>\n65<\/td>\n105<\/td>\nResistance method<\/td>\n<\/tr>\n
Top oil<\/td>\n55<\/td>\n95<\/td>\nThermometer<\/td>\n<\/tr>\n
Hotspot<\/td>\n78<\/td>\n118<\/td>\nFiber-optic sensor<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
4.1.2 Dynamic rise formula (IEC 60354)<\/strong><\/h5>\n

\u0394\u03b8o = \u0394\u03b8oR + \u03c4 \u00d7 (dP\/dt)<\/b><\/p>\n

\u03c4: Thermal time constant (small units \u22481.5h, large \u22483h).<\/p>\n

dP\/dt: Rate of loss change.<\/p>\n

Application:Calculating temperature rise in wind farms\u00a0with fluctuating loads.<\/p>\n

4.1.3 Maintenance tips<\/strong><\/h5>\n
(1)Oil level:\u00a0Expansion rate \u22480.0007\/\u00b0C \u2192 40K rise\u00a0increases volume by 2.8%.<\/strong><\/h6>\n
(2)Oil quality:Acid value >0.1mg KOH\/g reduces cooling\u00a0efficiency by 12-18%.<\/strong><\/h6>\n
(3)Cooling system:Fan failure raises ONAF-mode rise by\u00a040%.<\/strong><\/h6>\n

4.2 Ambient temperature<\/strong><\/h4>\n

IEEE defines “ambient” as 30\u00b0C annual average. In hot regions (e.g., Middle East), higher insulation classes (e.g., H-class) are required.<\/p>\n

4.3 Cooling methods<\/strong><\/h4>\n
(1)Dry-type: AN (natural convection) or AF (forced air).<\/strong>
\n(2)Oil-immersed: ONAN\/ONAF\/OFWF. Forced cooling(3)reduces rise but increases energy use.<\/strong><\/h6>\n

5. Temperature Rise Calculation and Monitoring<\/em><\/b><\/h3>\n

5.1 Calculation formulas<\/strong><\/h4>\n

Oil-immersed winding rise per IEC 60076-7:<\/p>\n

\"wps13\"<\/p>\n

Donde:<\/p>\n

Actual rise<\/p>\n

Full-load rise<\/p>\n

Load ratio (actual\/rated)<\/p>\n

Copper\/iron loss ratio<\/p>\n

Empirical exponent (oil: n\u22480.8; dry: n\u22481.0)<\/p>\n

5.2 Real-time monitoring<\/strong><\/h4>\n

Modern transformers use fiber-optic Distributed Temperature Sensing (DTS) or infrared thermography for hotspot tracking.<\/p>\n\n\n\n\n\n
Technology<\/b><\/td>\nAccuracy<\/b><\/td>\nLocation<\/b><\/td>\nCaso De Uso<\/b><\/td>\n<\/tr>\n
Infrared<\/td>\n\u00b13\u00b0C<\/td>\nWinding surface<\/td>\nPeriodic checks<\/td>\n<\/tr>\n
PT100 sensor<\/td>\n\u00b10.5\u00b0C<\/td>\nLV winding<\/td>\nFixed real-time monitoring<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Advanced solutions for oil-immersed units<\/p>\n

5.2.1 Fiber-optic DTS:<\/strong><\/h5>\n
(1) \u00b11\u00b0C accuracy, 0.01\u00b0C resolution.<\/strong><\/h6>\n
(2) Embedded in HV windings for 3D temperature mapping.<\/strong><\/h6>\n
(3) Hotspot detection via Raman scattering:<\/strong><\/i><\/h6>\n

\u0394T = (c \u00d7 \u0394\u03d5) \/ (4\u03c0L \u00d7 \u03b1)<\/b><\/b><\/p>\n

(\u03b1: Fiber coefficient).<\/p>\n

5.2.2 Dissolved Gas Analysis (DGA):C2H4\u00a0>50ppm indicates hotspots (>150\u00b0C).<\/strong><\/h5>\n

En Resumen<\/span><\/b><\/h2>\n

The difference in temperature rise limits between dry-type and oil-immersed transformers stems from the thermal performance gap between air and oil\u2014air\u2019s conductivity is just 1\/5 of oil\u2019s, and its specific heat is <1\/2, forcing dry-types to adopt stricter limits (typically 80-100K vs. oil\u2019s 65K avg.\/78K hotspot).<\/p>\n

For indoor applications (e.g., data centers, commercial buildings), dry-types excel with maintenance-free, leak-proof designs but require forced cooling and H-class insulation. In harsh outdoor environments (e.g., power plants, offshore platforms), oil-immersed units leverage oil\u2019s thermal mass and scalable cooling (OFAF\/OFWF) for compact designs and extended overload tolerance.<\/p>\n

Future innovations include:<\/p>\n

(1)Dry-type: Nano-doped epoxy (e.g., AlN fillers boost conductivity by 40%).<\/strong><\/h6>\n
(2)Oil-immersed: Bio-based insulating fluids (fire point >320\u00b0C) redefine safety margins.<\/strong><\/h6>\n

For optimal selection, engineers should use IEC 60076-14 digital twin models to simulate local climate and load profiles, quantifying 20-year thermal aging losses to balance safety and cost.<\/p>\n

Contacto<\/strong><\/h2>\n

LuShan, est. En 1975, es un Chino fabricante profesional que se especializa en los transformadores de potencia y reactores de m\u00e1s de 50 a\u00f1os. Los productos principales son transformador monof\u00e1sico, trif\u00e1sico de transformadores de aislamiento, transformador el\u00e9ctrico, transformador de distribuci\u00f3n, el paso hacia abajo y paso transformador de baja tensi\u00f3n del transformador, transformador de alto voltaje, transformador de control, transformador toroidal, R-transformador con n\u00facleo; DC inductores, CA reactores, filtrado de reactor de l\u00ednea y de carga del reactor, estrangulaciones, el filtrado de los reactores y de los intermedios, de alta frecuencia de los productos<\/a>.<\/p>\n

Nuestros transformadores de potencia y reactores son ampliamente utilizados en las 10 \u00e1reas de aplicaci\u00f3n: rapid transit, maquinaria de construcci\u00f3n, energ\u00eda renovable, de fabricaci\u00f3n inteligentes, equipos m\u00e9dicos, la mina de carb\u00f3n de la explosi\u00f3n de la prevenci\u00f3n, el sistema de excitaci\u00f3n, de vac\u00edo, de sinterizaci\u00f3n(horno), aire acondicionado central.<\/p>\n

Saber m\u00e1s acerca de transformadores de potencia y reactores: www.lstransformer.com<\/a>.<\/p>\n

Si desea obtener soluciones personalizadas para transformadores o reactores, p\u00f3ngase en contacto con nosotros.
\nWhatsApp\uff1a+86 13787095096
\nCorreo electr\u00f3nico: marketing@hnlsdz.com<\/p>","protected":false},"excerpt":{"rendered":"

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Due to differences in cooling methods, dry-type […]<\/p>\n","protected":false},"author":3,"featured_media":3210,"comment_status":"closed","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":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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":[48],"tags":[],"class_list":["post-1197","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq"],"yoast_head":"\nTemperature Rise Limits of Dry-Type Transformers vs. Oil-Immersed Transformers: Key Differences - LS power transformer, Line reactor, High-voltage transformer, Oil-immersed transformer-CHANGSHA LUSHAN ELECTRONIC TECHNOLOGY CO.,LTD<\/title>\n<meta name=\"description\" content=\"In power systems, transformers are the core equipment for energy conversion and distribution, and their performance and reliability directly impact the safety of the grid. During operation, transformers generate heat, making temperature rise a critical performance indicator. Due to differences in cooling methods, dry-type transformers and oil-immersed transformers exhibit significant variations in their temperature rise limits. 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