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10kV~220kV Oil-Immersed Power Transformers
Instrava Curated marks a strategic shift in how global enterprises source high-voltage power infrastructure. As a specialized B2B global supplier rather than a single-track manufacturer, our core value stems from rigorous market evaluation and technological curation. We understand that a 110kV~220kV power transformer is a mission-critical asset where grid failure is not an option. By acting as your expert technical filter, we meticulously evaluate trusted manufacturing facilities and select only field-proven, highly optimized transformer topologies. This curated approach eliminates procurement uncertainty, delivering heavy-duty grid solutions that guarantee absolute operational uptime, minimized line losses, and long-term capital confidence.
Transformer Description
Computational Precision & Material Supremacy
When curating high-pressure transformers for our portfolio, Instrava prioritizes products built on a foundation of advanced multi-physics calculation and premier material selection:
Toshiba-Powered Analytical Modeling: We select systems engineered using Japanese Toshiba analysis software alongside strict validation protocols. This ensures that the structural configuration of the core, coil, lead wires, and tank are simulated to eliminate electromagnetic and thermal field failure risks under real-world conditions.
High-Quality Step-Lap Magnetic Core: Features premium, high-permeability, low-loss silicon steel laminations. The core utilizes a precision-engineered step-lap joint design that minimizes air gaps, optimizes magnetic flux distribution, and reduces vibrations and audible operational noise.
Superior Insulation & Moisture Defense: The insulation system combines advanced cellulose-based paper, high-density pressboards, and synthetic insulating materials. These components undergo rigorous dehydration treatments to maximize moisture resistance, maintaining elite dielectric strength and structural integrity across extended lifespans.
Engineered Resilience, Security & Multi-Scenario Adaptability
The transformers within our curated collection are built to survive extreme short-circuit stresses and volatile outdoor environmental conditions:
Certified Short-Circuit Bearing Capacity: For definitive engineering peace of mind, our selected transformer series have fully passed all short-circuit bearing capacity evaluations and routine type tests conducted by the National Transformer Quality Supervision and Inspection Center.
Fully Sealed & Insulated Safety Structure: The completely sealed and insulated engineering design provides comprehensive protection for operational personnel while blocking the ingress of ambient moisture and hazardous environmental contaminants.
Dual-Grid Versatility (Network & Terminal): Engineered with a highly flexible internal configuration, making these units perfectly suited for both major regional transmission networks and localized terminal distribution nodes.
ONAN/ONAF Dual-Mechanism Cooling: Filled with premium, high-dielectric mineral oil serving as both an insulation agent and a high-conductivity cooling medium. Natural convection (ONAN) handles nominal loads, while external forced-air fans (ONAF) automatically engage to maximize heat dissipation via radiator fins during heavy overload spikes.
Integrated Safety Monitoring Loop: The high-strength steel tank features protective enclosures and integrated conservators to accommodate fluid thermal expansion. Critical warning systems—including Buchholz relays, positive-pressure relief valves, and real-time oil level indicators—provide automated monitoring of internal environments.
Transformer Parameter
Phase | Three |
Coil Number | 2 |
Usage | Potencia |
Coil Structure | Pie coil |
Rated Primary Voltage | 110 |
Rated Secondary Voltage | 11 |
Potencia | 10MVA |
Estándar | IEC60076 |
Garantía | 2 Years |
Cooling Method | ONAN |
Frecuencia | 50 / 60Hz |
Vector Group | YNd11 |
Material | Copper / Aluminium |
Aplicación | Mining |
Impedance | 10.5 |
Tapping Ranges | ±8*1.25% |
| Main Technical Parameters for oil-immersed power transformer | ||||||||
| Rated Power(kva) | High Voltage(kv) | H.V.Tap range | Low Voltage(kv) | Connection symbol | Short Circuit Impendence | No-load loss(kw) | On-load loss(kw) | No-load current(%) |
| 6300 | 63 66 69 110 132 138 220 | ±8x 1.25% | 6.3 6.6 10.5 11 33 69 | YNd11 YNyn0 others | 10-14 | 9.4 | 34 | 0.63 |
| 8000 | 11.2 | 40.4 | 0.63 | |||||
| 10000 | 13.1 | 47.6 | 0.75 | |||||
| 12500 | 15.4 | 56.5 | 0.53 | |||||
| 16000 | 18.5 | 69.5 | 0.49 | |||||
| 20000 | 21.8 | 84.2 | 0.49 | |||||
| 25000 | 25.6 | 99.5 | 0.4 | |||||
| 31500 | 30.4 | 120 | 0.4 | |||||
| 40000 | 36.2 | 140.3 | 0.39 | |||||
| 50000 | 42.6 | 174.3 | 0.39 | |||||
| 63000 | 52 | 210 | 0.39 | |||||
| 75000 | 60 | 238 | 0.49 | |||||
| 90000 | 69 | 274 | 0.49 | |||||
| 120000 | 85 | 328 | 0.46 | |||||
| 150000 | 101 | 385 | 0.42 | |||||
| 160000 | 105 | 404 | 0.42 | |||||
| 180000 | 115 | 436 | 0.42 | |||||
| 240000 | 144 | 539 | 0.4 | |||||
Instrava OEM/ODM
Reliable Instruments & Power Infrastructure. Solutions That Fit Your Application.
Instrava is focused on delivering reliable industrial solutions through carefully curated products, application-driven optimization, and flexible customization. We select proven measurement instruments and heavy-duty power transformers from trusted China manufacturers to ensure consistent quality. By thoroughly evaluating engineering topologies against real working conditions, we solve practical grid and process challenges, providing tailored configurations to meet specific application needs.
By combining selection expertise with deep application understanding, Instrava helps customers reduce operational risk, improve energy efficiency, and achieve dependable results across complex industrial and power distribution environments.
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What validation testing ensures the reliability of Instrava’s curated 110kV~220kV oil-immersed transformers under sudden grid faults?
Every 110kV~220kV oil-immersed transformer in our curated portfolio has successfully passed full short-circuit bearing capacity tests and complete routine type testing certified by the National Transformer Quality Supervision and Inspection Center. Furthermore, during the design phase, the manufacturing tracks utilize Japanese Toshiba analysis software to meticulously model insulation parameters, temperature fields, and electromagnetic forces, ensuring the core, coils, lead wires, and tank can structurally withstand intense electrical surges.
How does the step-lap core design in three-phase high-voltage transformers reduce operational costs?
The precision-engineered step-lap joint design reduces costs by drastically minimizing air gaps within the magnetic core. By utilizing high-permeability, low-loss silicon steel laminations stacked in a multi-stage step configuration, the magnetic flux distribution is completely optimized. This engineering technique directly lowers both hysteresis and eddy current losses, which results in lower total no-load losses, decreased operational noise, and superior energy efficiency for long-term power grid applications.
Can this high-voltage oil-immersed transformer handle continuous overload conditions in extreme environments?
Yes, the selected transformer line features advanced low-temperature rise engineering and an automated dual-mechanism cooling system (ONAN/ONAF) designed specifically for high overload capacity. High-quality mineral oil circulates via natural convection under standard loads, while external cooling fans and radiator fins automatically engage to accelerate heat dissipation during heavy loading. This is supported by high-thermal-stability cellulose papers and synthetic insulation that retain full structural and dielectric strength over extended thermal spikes.
Why is a fully sealed structure critical for transformers deployed in petrochemical and mining enterprises?
A fully sealed and insulated structure is critical because it completely isolates the internal insulation medium from hazardous ambient elements. In petrochemical plants and mining fields, atmospheric moisture, dust, and airborne contaminants can accelerate insulation degradation or trigger flashovers. The sealed tank prevents the ingress of these contaminants while utilizing specialized conservators to absorb the natural thermal expansion of the oil, guaranteeing personal safety and maintenance-free longevity.
What is the operational benefit of a transformer engineered for both network loop and terminal distribution applications?
A transformer engineered for both configurations provides the dual-design flexibility to handle high-voltage grid interconnection loops (network) and dedicated point-of-use industrial step-down distribution (terminal). Instrava’s curated 110kV~220kV units feature highly adaptable internal vector groups and robust tap-changing frameworks. This allows them to absorb regional line-voltage fluctuations inside localized transmission networks while simultaneously delivering exceptionally stable, surge-protected power directly to heavy machinery at terminal mining or industrial sites.
How do integrated Buchholz relays and pressure relief valves protect high-voltage oil-immersed transformers from catastrophic failure?
They prevent catastrophic failures by acting as a multi-tiered, automated early warning and mechanical defense system against internal electrical faults. The Buchholz relay is mounted on the piping to the oil conservator; it detects slow gas accumulation caused by minor insulation breakdown or violent oil surges caused by severe internal short circuits, instantly triggering automated alarms or circuit breaker trips. Concurrently, positive-pressure relief valves safely vent excessive kinetic pressure built up by sudden oil thermal expansion, preventing tank ruptures and preserving structural containment.
Por qué elegir Instrava
Basados en la coherencia, no en las reclamaciones
Aplicaciones industriales
Estamos especializados en el análisis y la detección industriales, con una clara comprensión de los entornos operativos y los requisitos del mundo real.
Estrictos criterios de selección de productos
Cada instrumento se evalúa en función de su rendimiento, estabilidad e idoneidad para la aplicación, no sólo de sus especificaciones o precios.
Suministro fiable y calidad constante
Trabajamos con fabricantes de confianza para garantizar un suministro estable, una calidad constante y una entrega fiable.
Apoyo práctico basado en la experiencia
Nuestras recomendaciones se basan en el conocimiento de la aplicación, lo que ayuda a los clientes a evitar problemas comunes y lograr resultados fiables.
Instrava se ha creado para reducir la incertidumbre, de modo que cada decisión que tome sea más clara, segura y fiable.
