{"id":10749,"date":"2026-08-29T23:43:19","date_gmt":"2026-08-29T15:43:19","guid":{"rendered":"https:\/\/q8bbzjnpm5.wpdns.site\/?p=10749"},"modified":"2026-08-29T23:43:19","modified_gmt":"2026-08-29T15:43:19","slug":"key-points-for-maintaining-power-transformers-unveiled","status":"publish","type":"post","link":"https:\/\/subian-electric.com\/es\/news\/key-points-for-maintaining-power-transformers-unveiled\/","title":{"rendered":"Puntos Clave para el Mantenimiento de Transformadores de Potencia Revelados"},"content":{"rendered":"<p>Un ingeniero est\u00e1 revisando el historial de mantenimiento de un transformador elevador de 50 MVA que ha estado en operaci\u00f3n durante 14 a\u00f1os. El transformador no ha enfrentado ninguna falla importante hasta ahora, pero el \u00faltimo an\u00e1lisis de aceite muestra un aumento en los niveles de hidr\u00f3geno y se deben tomar algunas muestras de aceite de OLTC. Los ingenieros han fijado el presupuesto anual para el mantenimiento del transformador y el transformador est\u00e1 a punto de ser utilizado en la pr\u00f3xima parada, que es de suma importancia para el proceso. En realidad, est\u00e1 claro que las tareas deben ser priorizadas en funci\u00f3n de la eficiencia de cada tarea de acuerdo con el momento en que la tarea debe ser realizada y c\u00f3mo cada tarea debe ser analizada por su efectividad.<\/p>\n<p>Este art\u00edculo destaca los aspectos m\u00e1s importantes del proceso de mantenimiento de transformadores de potencia que est\u00e1n ocultos en manuales extensos, a saber, qu\u00e9 tareas deben realizarse realmente para garantizar la fiabilidad del equipo, qu\u00e9 significan los resultados de la inspecci\u00f3n para el mantenimiento del transformador y qu\u00e9 tareas se pueden o no se pueden realizar.<\/p>\n<blockquote><p>Respuesta R\u00e1pida: El mantenimiento del transformador de potencia puede salvaguardar el equipo mediante: gesti\u00f3n de aceite, pruebas el\u00e9ctricas, mantenimiento de accesorios y documentaci\u00f3n. Los par\u00e1metros en el n\u00facleo de la gesti\u00f3n incluyen: la temperatura del aceite de 75 \u2013 85\u00b0C mientras trabaja bajo la carga nominal, humedad del aceite por debajo de 20 \u2013 30 ppm, voltaje de ruptura superior a 30 \u2013 40 kV, y el TDCG menor de 720 ppm de acuerdo con IEEE C57.104. Los costos anuales de mantenimiento alcanzan $1,500\u2013$5,000 por sitio.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10750\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Key-Points-For-Maintaining-Power-Transformers-Unveiled.webp\" alt=\"Key Points For Maintaining Power Transformers Unveiled\" width=\"1448\" height=\"1086\" \/><\/p>\n<hr \/>\n<h2 id=\"why-maintenance\">Por qu\u00e9 el Mantenimiento del Transformador de Potencia es No Negociable<\/h2>\n<p>El transformador de potencia es, a la vez, el equipo m\u00e1s costoso, de mayor duraci\u00f3n y menos redundante que se encuentra en muchas estaciones de energ\u00eda el\u00e9ctrica. Si surge un problema con un transformador, la producci\u00f3n se detendr\u00e1, la planta se desconectar\u00e1 y tomar\u00e1 algunos meses obtener un reemplazo de manera urgente. Seg\u00fan los datos de fiabilidad proporcionados por los grupos de trabajo de IEEE y CIGR\u00c9, los fallos de aislamiento, los cambiadores de tomas y las roturas de bujes son las principales fuentes de mal funcionamiento de los transformadores; estos componentes pueden ser identificados durante procedimientos de mantenimiento adecuadamente designados que previenen que la falla real ocurra.<\/p>\n<p>La justificaci\u00f3n econ\u00f3mica es bastante simple. Por ejemplo, un transformador de potencia de 50MVA cuesta $250,000 y puede costar hasta $1.2 millones; al mismo tiempo, su costo de mantenimiento anual es de $1,500 a $5,000, lo que representa solo un peque\u00f1o porcentaje del costo del equipo. Adem\u00e1s, se sabe que las paradas no planificadas cuestan al menos $50,000 y pueden alcanzar $2 millones, dependiendo de la carga perdida y su duraci\u00f3n. Por lo tanto, es seguro decir que es prudente asumir el costo del mantenimiento, ya que es el m\u00e1s rentable en t\u00e9rminos de la magnitud de las posibles p\u00e9rdidas.<\/p>\n<h2 id=\"pillars\">Los Cuatro Pilares del Mantenimiento del Transformador de Potencia<\/h2>\n<p>En lo que respecta al mantenimiento de transformadores enfriados por aceite, se encuentra bajo una de las cuatro \u00e1reas, que asegura que nada quede sin atender y que nada se haga en exceso.<\/p>\n<table>\n<thead>\n<tr>\n<th>Pilar<\/th>\n<th>Lo que Cubre<\/th>\n<th>Prueba \/ Tarea Principal<\/th>\n<th>Capturas<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Gesti\u00f3n de aceite y DGA<\/td>\n<td>Condici\u00f3n del aceite aislante y gases disueltos<\/td>\n<td>DGA, humedad, voltaje de ruptura, acidez<\/td>\n<td>Fallos t\u00e9rmicos, arco, entrada de humedad, contaminaci\u00f3n<\/td>\n<\/tr>\n<tr>\n<td>Pruebas el\u00e9ctricas<\/td>\n<td>Integridad de bobinas y aislamiento<\/td>\n<td>Resistencia de aislamiento, relaci\u00f3n, resistencia de bobinado, corriente de magnetizaci\u00f3n<\/td>\n<td>Da\u00f1o en el bobinado, degradaci\u00f3n del aislamiento<\/td>\n<\/tr>\n<tr>\n<td>Cuidado de accesorios y componentes<\/td>\n<td>Aisladores, respiraderos, cambiadores de toma, refrigeraci\u00f3n, protecci\u00f3n<\/td>\n<td>Inspecci\u00f3n visual, prueba de aceite OLTC, verificaci\u00f3n de respiraderos, prueba de ventilador<\/td>\n<td>Desgaste mec\u00e1nico, humedad, fallo de refrigeraci\u00f3n<\/td>\n<\/tr>\n<tr>\n<td>Documentaci\u00f3n y tendencias<\/td>\n<td>Historia, puntuaci\u00f3n de condici\u00f3n, clasificaci\u00f3n de riesgo<\/td>\n<td>Libros de registro, CMMS, an\u00e1lisis de tendencias<\/td>\n<td>Fallos de desarrollo lento que se pierden en lecturas \u00fanicas<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10751\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/The-Four-Pillars-of-Power-Transformer-Maintenance.webp\" alt=\"Los Cuatro Pilares del Mantenimiento del Transformador de Potencia\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"oil\">Pilar 1: Gesti\u00f3n de Aceite y DGA<\/h2>\n<p>El aceite act\u00faa como el aislamiento y refrigerante en el transformador y como una herramienta de diagn\u00f3stico para identificar los fallos dentro del equipo. El an\u00e1lisis de gases disueltos representa la prueba m\u00e1s completa que revela toda la informaci\u00f3n requerida. Los fallos descomponen el aislamiento de papel y aceite en gases espec\u00edficos disueltos en el aceite, como hidr\u00f3geno, metano, etano, etileno, acetileno, CO y CO2. La interpretaci\u00f3n de los gases utilizando IEEE C57.104 e IEC 60599 indica el tipo y nivel del fallo.<\/p>\n<p>Valores importantes de gesti\u00f3n de aceite en transformadores de potencia:<\/p>\n<table>\n<thead>\n<tr>\n<th>Par\u00e1metro<\/th>\n<th>Normal<\/th>\n<th>Advertencia<\/th>\n<th>Acci\u00f3n<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Voltaje de ruptura del aceite<\/td>\n<td>&gt; 40\u201360 kV<\/td>\n<td>30\u201340 kV<\/td>\n<td>&lt; 30 kV: filtrar o reemplazar aceite<\/td>\n<\/tr>\n<tr>\n<td>Humedad del aceite<\/td>\n<td>&lt; 15\u201320 ppm<\/td>\n<td>20\u201330 ppm<\/td>\n<td>&gt; 30\u201340 ppm: secar y encontrar fuente de entrada<\/td>\n<\/tr>\n<tr>\n<td>Gas combustible total disuelto<\/td>\n<td>&lt; 720 ppm<\/td>\n<td>720\u20131,920 ppm<\/td>\n<td>&gt; 1,920 ppm: investigar; &gt; 4,630 ppm: retirar de servicio<\/td>\n<\/tr>\n<tr>\n<td>Acidez<\/td>\n<td>Baja (n\u00famero de neutralizaci\u00f3n &lt; 0.1\u20130.15 mg KOH\/g)<\/td>\n<td>Tendencia en aumento<\/td>\n<td>Alta: reacondicionar aceite<\/td>\n<\/tr>\n<tr>\n<td>Furan content<\/td>\n<td>Bajo<\/td>\n<td>Rising<\/td>\n<td>High: paper aging confirmed, plan end-of-life<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The practical scheduled maintenance for power transformers includes an annual DGA, and a semi-annual one for critical units or after a fault event. Since OLTC compartment oil ages faster, its oil is tested every 6-12 months.Always collect the sample from the same valve at a defined load and note down the temperature of the oil.<\/p>\n<h2 id=\"electrical\">Pillar 2: Electrical Testing<\/h2>\n<p>Electrical tests assist oil tests in inspecting the windings and insulation directly:<\/p>\n<ul>\n<li>Insulation resistance (megger): is assessed between winding to the ground and among the windings. Normal high-voltage winding\u2019s insulation resistance should show from 1000 to 5000 M\u03a9 or even more; comparison over the years is of greater importance than the numbers in absolute. If the numbers start dropping, there is a presence of moisture or pollution.<\/li>\n<li>Winding resistance: is measured phase by phase and compared; any variation above 2\u20133 percent indicates a fault either in a connection or turn.<\/li>\n<li>Turn ratio: is a winding ratio test confirming the results with the nameplate; a deviation above 0.5-1 percent indicates shorts in the windings.<\/li>\n<li>Magnetizing current: a rise in this current may indicate the short or damage in the core.<\/li>\n<\/ul>\n<p>These tests normally cost between $300 and $1,500 for a unit per inspection and are performed once a year or after some serious incident, such as short circuit or lightning strike. When joined with DGA, they can help to determine the problem: DGA informs us that there is a failure, while the tests indicate the location.<\/p>\n<h2 id=\"accessories\">Pillar 3: Accessory and Component Care<\/h2>\n<p>Accessories are known to malfunction more than the core transformer and failures can be avoided because they are predictable. The following table shows necessary tasks that should be performed and the costs associated with the repair:<\/p>\n<table>\n<thead>\n<tr>\n<th>Accessory<\/th>\n<th>Inspecci\u00f3n<\/th>\n<th>Interval<\/th>\n<th>Typical Cost<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Aisladores<\/td>\n<td>Cracks, tracking, oil seepage; PD\/tan-delta for critical units<\/td>\n<td>Daily visual; PD every 3\u20136 yr<\/td>\n<td>$3,000\u2013$30,000 per phase to replace<\/td>\n<\/tr>\n<tr>\n<td>Deshidratador<\/td>\n<td>Silica gel color; regenerate when pink<\/td>\n<td>Daily check<\/td>\n<td>$50\u2013$300<\/td>\n<\/tr>\n<tr>\n<td>OLTC<\/td>\n<td>Oil sample, drive motor, contacts<\/td>\n<td>Oil 6\u201312 mo; overhaul 3\u20136 yr<\/td>\n<td>$5,000\u2013$40,000 per overhaul<\/td>\n<\/tr>\n<tr>\n<td>Cooling fans \/ pumps<\/td>\n<td>Operation, airflow, radiator fins<\/td>\n<td>Monthly test<\/td>\n<td>$300\u2013$5,000 per component<\/td>\n<\/tr>\n<tr>\n<td>Dispositivos de protecci\u00f3n<\/td>\n<td>Buchholz and relief valve trip circuits<\/td>\n<td>During scheduled outages<\/td>\n<td>$200\u2013$1,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>Bushings: check for damages, cracks and oil leakages and insure that damaged units are quickly replaced. Bushing failure can destroy transformers and costs of replacement vary from $3,000 to $30,000. PD and tan-delta tests can be performed every 3-6 years for important bushings.<\/li>\n<li>Breather and conservator: silica gel should always be blue; if it is pink, it must be regenerated or replaced. When a breather is saturated, it allows moist air to penetrate into oil, which causes slow insulation degradation.<\/li>\n<li>Tap changer: for OLTC units, OLTC oil should be sampled regularly; tap change operation should be checked and motor current verified every 3-6 years. OLTC maintenance costs from $5,000 to $40,000 for one repair cycle but avoids major failures.<\/li>\n<li>Cooling system: fans, pumps and thermostats must be tested; radiator fins cleaned and oil flow monitored for failures.<\/li>\n<li>Protection devices: Buchholz relay, pressure protection devices and trip circuits should be tested during regular repairs.<\/li>\n<\/ul>\n<h2 id=\"documentation\">Pillar 4: Documentation and Trend Tracking<\/h2>\n<p>Data pertaining to maintenance is incredibly valuable, while documentation provides support for other essential components of the system. A key concept here is the practice of maintaining history for every unit of the system, containing results of commissioning tests, DGA performance and analysis, electrical tests, overload incidents, repairs and alarms. This history allows for three things: discovering patterns (e.g. a gas concentration increased from 40 to 120 ppm in 24 months), establishing the conditions (ordering the units per budget priorities), and proving the existence of warranty and insurance agreements.<\/p>\n<p>Most of the maintenance procedures today are automated by modern asset management systems. The minimum that should be done is keeping a logging book of all useful metrics: all readings, dates of events and actions of maintenance staff. Those companies that maintain the data gain advantages from it through getting money for justifying their budgets, helping audit regulation authorities, and speeding up root cause investigation of any issue.<\/p>\n<h2 id=\"schedule\">The Maintenance Schedule: Tasks and Frequencies<\/h2>\n<p>The schedule below contains a useful reference point for power transformers. It can be altered based on the urgency, age, and state of the transformer.<\/p>\n<table>\n<thead>\n<tr>\n<th>Frecuencia<\/th>\n<th>Tarea<\/th>\n<th>Typical Cost<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Daily<\/td>\n<td>Visual round: oil level, sound, temperature, bushings, leaks<\/td>\n<td>$300\u2013$1,500\/yr labor<\/td>\n<\/tr>\n<tr>\n<td>Trimestral<\/td>\n<td>Insulation resistance, OLTC visual\/functional check, fan test<\/td>\n<td>$200\u2013$800<\/td>\n<\/tr>\n<tr>\n<td>Semestral<\/td>\n<td>DGA for critical units, OLTC oil sample<\/td>\n<td>$200\u2013$500 per sample<\/td>\n<\/tr>\n<tr>\n<td>Annual<\/td>\n<td>Full DGA, oil quality package, winding resistance, ratio, megger<\/td>\n<td>$800\u2013$2,500<\/td>\n<\/tr>\n<tr>\n<td>Every 3\u20136 years<\/td>\n<td>OLTC overhaul, bushing PD\/tan-delta, protection test, thorough inspection<\/td>\n<td>$5,000\u2013$40,000<\/td>\n<\/tr>\n<tr>\n<td>Every 10\u201315 years<\/td>\n<td>Major overhaul, oil filtration\/replacement, gasket renewal<\/td>\n<td>$10,000\u2013$60,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>As a general rule, a DGA must be run anytime and following any unusual incident. In the case of such event happening, the DGA must be done immediately.<\/p>\n<h2 id=\"standards\">Key Standards for Maintenance Limits<\/h2>\n<p>Decisions regarding maintenance works must be based on the standards in place and not on hearsay. Here below is the list of the mandatory references in this field:<\/p>\n<ul>\n<li>IEEE C57.104 &#8211; the interpretation of partial discharge and its evaluation for oil-based diagnostics.<\/li>\n<li>IEC 60599 &#8211; an international guide for DGA analysis of old equipment.<\/li>\n<li>IEC 60422 &#8211; control and servicing of mineral insulating oils with quality indicators.<\/li>\n<li>IEC 60156 &#8211; test method for dielectric failure.<\/li>\n<li>IEC 60076-7 &#8211; recommendation regarding transformer loading and temperature limits.<\/li>\n<li>IEC 60270 \/ IEC 62478 &#8211; methods of partial discharge measurement in modern diagnostics.<\/li>\n<\/ul>\n<p>If the manufacturer&#8217;s instruction of a specific piece of equipment puts forward stricter or more specific limits, they should be adhered to.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-10752\" src=\"https:\/\/subian-electric.com\/wp-content\/uploads\/2026\/08\/Key-Standards-for-Maintenance-Limits.webp\" alt=\"Key Standards for Maintenance Limits\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2 id=\"budget\">Budgeting Maintenance: Cost vs. Failure Risk<\/h2>\n<p>Maintenance budgets should be allocated according to risk and not based on experience or habits. Some principles are:<\/p>\n<table>\n<thead>\n<tr>\n<th>Art\u00edculo<\/th>\n<th>Valor T\u00edpico<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Annual maintenance program (per power transformer)<\/td>\n<td>$1,500\u2013$5,000<\/td>\n<\/tr>\n<tr>\n<td>DGA sample<\/td>\n<td>$200\u2013$500<\/td>\n<\/tr>\n<tr>\n<td>Oil quality package<\/td>\n<td>$150\u2013$400<\/td>\n<\/tr>\n<tr>\n<td>Online monitoring suite (critical units)<\/td>\n<td>$25,000\u2013$120,000 capital<\/td>\n<\/tr>\n<tr>\n<td>Transformer replacement (20\u201360 MVA)<\/td>\n<td>$250,000\u2013$1.2 million<\/td>\n<\/tr>\n<tr>\n<td>Unplanned outage cost<\/td>\n<td>$50,000\u2013$2 million per event<\/td>\n<\/tr>\n<tr>\n<td>Expected service life with proper maintenance<\/td>\n<td>30\u201340 years<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>It all comes down to math: a $400 per year DGA sample of a $500,000 asset for which you are getting 30+ years of service from is the least costly investment you make. The same reasoning applies to extending inspections for units in good condition and to increasing inspection frequency for riskier units.<\/p>\n<h2 id=\"modern\">Modern Maintenance Tools: Monitoring and Analytics<\/h2>\n<p>Monitoring and analytics are revolutionizing the maintenance discipline. With online DGA monitors, partial discharge sensors, and temperature\/load trackers in place, continuous data is made available for critical units, thanks to analytics platforms that transform the data into serious alarms. The economics call for a combination of methods: online monitors for the few critical units that would cause a catastrophic failure if one did occur, and the usual annual laboratory DGA for the major part. The standards-based threshold is unchanged, the only difference being that online monitoring systems get the fault that happens in between sampling the readings.<\/p>\n<p>However, expert interpretation remains essential. Data can lead to alarm fatigue or missed failures.<\/p>\n<h2 id=\"faq\">Preguntas Frecuentes<\/h2>\n<h3>How often should a power transformer be maintained?<\/h3>\n<p>The basic principles behind power transformer maintenance include recurrent visual surveillance twofold, electrical checks occurring quarterly and DGA plus oil quality testing on an annual basis. Semestral DGA testing may be performed for the most critical devices, whereas online monitoring is also applicable; OLTC oil is tested almost once per year; major repairs take place once in five to ten years. In case of any abnormalities, an immediate testing must be conducted first.<\/p>\n<h3>What are the most important maintenance tests for a power transformer?<\/h3>\n<p>Dissolved gas analysis is considered the most useful single tests, because it enables to detect thermal and electrical problems before the catastrophe. It is usually used together with moisture and breakdown voltage tests, winding resistance and insulation tests, which makes five tests covering the majority of deterioration indicators.<\/p>\n<h3>How much does power transformer maintenance cost per year?<\/h3>\n<p>It costs around 1.500-5.000 dollars each year to implement the totally condition-based program for power transformers, including daily surveillance, DGA performed on an annual basis (costing 200-500 dollars), oil quality (150-400 dollars) and electrical testing (300-1.500). Major repairs cost should also be taken into consideration \u2013 they require 5.000-60.000 dollars once in five or ten years.<\/p>\n<h3>What is the normal service life of a maintained power transformer?<\/h3>\n<p>With disciplined oil management, suitable DGA monitoring, and regular electrical testing power transformers commonly serve for 30-40 years, some even reach 50. Insulation aging follows exponential relation with temperature: every 6-8 K of stable spot temperature above the design double insulation aging, which makes discipline loading to be a maintenance tool.<\/p>\n<h3>Can predictive maintenance prevent all transformer failures?<\/h3>\n<p>No, predictive maintenance helps to detect and prevent gradual failures (due to insulation, humidity, fracturing, oil contamination) that account for continuous defeats. However, bushing explosion, discharges and outside short-circuits cannot be predicted.<\/p>\n<h2 id=\"references\">Referencias<\/h2>\n<ul>\n<li><a href=\"https:\/\/ieeexplore.ieee.org\/document\/9771388\" rel=\"nofollow noopener\" target=\"_blank\">IEEE C57.104: Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers<\/a> \u2014 The reference for DGA thresholds and maintenance response levels.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/633\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60422: Supervision and Maintenance Guidance for Mineral Insulating Oils<\/a> \u2014 Oil quality limits and maintenance practice for in-service transformers.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/352\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60599: Guide to the Interpretation of DGA in Mineral Oil-Impregnated Equipment<\/a> \u2014 International framework for gas interpretation in aged equipment.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/637\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60156: Insulating Liquids \u2014 Determination of the Breakdown Voltage<\/a> \u2014 Test standard for oil dielectric strength.<\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/632\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60076-7: Loading Guide for Oil-Immersed Power Transformers<\/a> \u2014 Temperature limits and loading guidance for oil-immersed units.<\/li>\n<li><a href=\"https:\/\/www.cigre.org\/\" rel=\"nofollow noopener\" target=\"_blank\">CIGR\u00c9<\/a> \u2014 Technical brochures on transformer maintenance, reliability, and condition assessment.<\/li>\n<li><a href=\"https:\/\/subian-electric.com\/es\/\">Jiangsu Subian Electric Power<\/a> \u2014 IEC 60076-compliant transformer manufacturer providing maintenance documentation and technical support.<\/li>\n<\/ul>\n<h2 id=\"conclusion\">Conclusi\u00f3n<\/h2>\n<p>The maintenance of power transformers should concentrate on quality service rather than mass production in the traditional sense of the word. The process of maintaining equipment revolves around four pillars: management of oil and DGA, electrical inspections, support maintenance, and documentation. The implementation of the process should ensure the use of asset to the maximum extent, the maintenance being cheap.<\/p>\n<ul>\n<li>Perform DGA tests once a year and after each troublesome situation.<\/li>\n<li>Conduct DGA simultaneously with oil and electrical tests.<\/li>\n<li>Maintain the discipline of accessory care: insulating bushing, breather, OLTC, and cooling system.<\/li>\n<li>Document and keep records.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>An engineer is checking the maintenance history of a 50 MVA step up transformer that is being in operation for 14 years. The transformer has not faced any major failure yet but the last oil analysis shows increase in levels of hydrogen and some samples of OLTC oil have to be taken. Engineers have fixed [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":10750,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[77],"tags":[],"class_list":["post-10749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/posts\/10749","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/comments?post=10749"}],"version-history":[{"count":2,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/posts\/10749\/revisions"}],"predecessor-version":[{"id":10983,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/posts\/10749\/revisions\/10983"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/media\/10750"}],"wp:attachment":[{"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/media?parent=10749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/categories?post=10749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subian-electric.com\/es\/wp-json\/wp\/v2\/tags?post=10749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}