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PRODUCT DETAIL / POWER TRANSFORMER
35kV Power Transformer
35kV primary voltage · 1000–10000 kVA · ONAN / ONAF cooling
01 / OVERVIEW
Source-backed product overview.
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We produce the 35kV oilimmersed power transformer equipped with ONAN / ONAF dualcooling modes. It delivers lownoise performance, high energyefficiency and stable fullload output, with capacity ranging from 1000 kVA to 10000 kVA for versatile project applications.
Our 35kV oilimmersed power transformer covers capacity 1000 kVA10000 kVA and supports ONAN / ONAF dual cooling modes for highefficiency, energysaving and stable performance.
Designed to comply with both national and IEC international standards, our transformer features dependable insulation, low losses and flexible voltage regulation. It fits powergrid utilities, mining & industrial enterprises, newenergy power stations and many other scenarios.
Thanks to compact mechanical layout and userfriendly maintenance design, the equipment guarantees longterm safe operation. It provides stable and costeffective voltage conversion & power transmission for medium and highvoltage distribution systems.
PRODUCT / APPLICATION VIEW
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02 / FEATURES
Capabilities described in the source.
EnergySaving & Low Loss
We adopt lowloss core construction to cut operational losses. It reduces energy consumption and lowers total operating costs during longtime service.
DualCooling High Efficiency
ONAN / ONAF dualcooling configuration ensures quiet performance under light loads and robust output at full load. It automatically adapts to load variations and maintains stable power supply.
Reliable Insulation
Highgrade insulation structure provides strong voltagewithstand and impactresistance capability. Sealed and durable construction enables safe and extended service life.
Comprehensive Protection
Complete protection assemblies are integrated for rapid fault response, delivering fullscope safeguards for safe and stable equipment operation.
Stable Voltage Regulation
Optimized tapchange range guarantees smooth output voltage. It accommodates gridvoltage fluctuations to secure consistent power quality.
Easy Operation & Maintenance
Compact mechanical footprint suits diverse installation environments. Daily maintenance workload is minimal to keep upkeep expenses low.
03 / SPECIFICATIONS
Technical parameters.
Source table retained in full where supplied.
| Item | Specification |
|---|---|
| Rated Power | 1000kVA, 2000kVA, 3150kVA, 4000kVA, 5000kVA, 6300kVA, 8000kVA, 10000kVA |
| Rating Primary Voltage | 35kV ±2×2.5% or 35kV ±3×2.5% |
| Secondary Voltage | 6.3kV, 10.5kV, 11kV, 20kV |
| Frequency | 50Hz (60Hz available on request) |
| Vector Group | Dyn11 / YNd11 (standard: Dyn11) |
| Winding Material | Highpurity oxygenfree copper (Cu) |
| Efficiency | ≥98.0% – 99.7% (increases with rated power) |
| Enclosure material | Carbon steel tank with anticorrosion paint |
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04 / SELECTION NOTES
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Site conditions
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05 / APPLICATIONS
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06 / PROOF
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The source document is retained in the private inventory as src-005. Claims, certifications and performance figures marked in the inventory remain pending confirmation before production publication.
Pending confirmation: missing-mentioned-cases, proof-and-claims.
07 / SERVICE
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Selection
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Documentation
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Support
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Frequently asked questions.
Q: What cooling method does this 35kV transformer adopt, and is it suitable for 100010000kVA? A: Our 35 kV power transformer uses fullysealed oilimmersed structure with standard ONAN / ONAF dual cooling modes. Capacity coverage spans 1000 kVA10000 kVA. It achieves low temperature rise and strong overload capacity with high operational stability for 35 kV powergrid deployment.
Q: Which standards does the product comply with, and how about its insulation and shortcircuitwithstand capability? A: It is designed and manufactured strictly complying with IEC 60076, GB/T 1094 and other international & national standards. Equipped with highgrade insulation system, it meets requirements for powerfrequency withstand voltage, induced withstand voltage and lightningimpulse tests. Excellent shortcircuitwithstand strength guarantees reliable field performance.
Q: What type of insulating oil is used, and what about environmentalsafety performance? A: We deploy premiumgrade transformer oil featuring low freezing point and high breakdown strength. The transformer is wellsealed, leakproof and firesafe, fit for longterm outdoor and industrialsite operation.
Q: How is servicelife and corecomponent quality guaranteed? A: We use highquality grainoriented coldrolled siliconsteel sheets and highpurity oxygenfree copper conductors for lowloss and lownoise output. Design service life ≥ 30 years under nominal operating conditions. Every unit passes fullset typetests and routinetests before shipment. Spareparts stock is maintained; repair workflows are transparent with clear costing, plus lifetime technical support.
Q: What production and testing equipment does your factory have for 35kV power transformers? A: Our workshop holds dedicated automatic production lines and complete test instruments for 35 kV power transformers: Automatic siliconsteel sheet cutting and stacking line Vacuum drying & vacuum oilfilling system Winding forming and pressing equipment Fullset typetest & routinetest devices (noload test, load test, voltagewithstand test, ratio test, resistance test, etc.)
All transformers go through strict qualitycontrol procedures during manufacturing and inspection.
Q: What is standard order leadtime for 1000kVA10000kVA ONAN/ONAF transformers? A: Normal production leadtime for 1000 kVA10000 kVA ONAN / ONAF transformers is 3045 days after deposit receipt and full technicalspec confirmation. Exact leadtime depends on order quantity, voltage configuration and production scheduling.
Q: What is the difference between standard accessories and optional accessories for this transformer? A: Standard accessories (included in basic scope): oillevel indicator, thermometer, pressurerelief device, lifting lugs, foundation bolts, nameplate and so on. Optional accessories (extra cost for custom orders): online oiltemperature monitoring device, oil conservator assembly, offcircuit / onload tapchanger, cable box, antiseismic base, external cooling fans and other customfit components.
Q: Does your factory accept custom configurations for voltage, tapping, vectorgroup and coolingmode? A: Yes, we support customdesigned manufacturing against customerprovided requirements: Custom rated power, primary & secondary voltage Custom vectorgroup, impedance voltage, tapchange range Coolingmode adjustment (ONAN / ONAF), highaltitude adaptation, insulationlevel tuning Special dimension, colour, material and structural specifications for specific installation scenarios
Q: Regarding transportation and installation for this 35kV transformer? A: 35 kV oilimmersed power transformers are normally delivered as complete assemblies by truck, container or breakbulk vessel, with secure fastening and shockproof protection to maintain integrity over longdistance transit.
Project references in the supplied document.
Distribution transformers serve as the voltageconversion backbone for all gridconnected industries. Voltage rating, thermal class and mounting configuration can be custommatched for target applications.
Grid Upgrade Project for 8 35kV Power Transformers in Kazakhstan
20 sets of 11kV oilimmersed transformers grid transformation project in Nigeria
15 Units 22kV Oilimmersed Transformer Industrial Park Distribution in Vietnam Project
Thailand Bangkok 11 sets of KYN28A24 switchgear + SCB14 drytype transformer complete project
Gridconnected project of 12 PV transformers + ring cabinets in Java, Indonesia
Only project records with supplied detail material have independent routes. Other named references require confirmation.
08 / RELATED
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