On Load Tap Changing Power Transformer Manufacturers – OLTC Specialists
Subian Electric manufactures on load tap changing power transformers – OLTC units from 1000 kVA to 63000 kVA, 35 kV to 132 kV class – at our 50,000-square-metre factory in Xuzhou, Jiangsu, China. Our 350+ employees have served utilities in 50+ countries since 2019.
As a factory-direct manufacturer and supplier, we provide OLTC transformers with factory pricing, voltage regulation engineering and complete test documentation.
Send your voltage, capacity and regulation requirements. Our export team will respond with a quotation and technical proposal.
Since 2019 · 50,000m² · 350+ Staff
On Load Tap Changing Power Transformers We Manufacture
OLTC power transformers from 1000 kVA to 63000 kVA, 35 kV to 132 kV class, with voltage regulation for grid and industrial substations.
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10kV محول جاف - سلسلة SCBH سبائك غير متبلورة
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20-35KV محول جاف
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20-35KV سلسلة SCB محول جاف من راتنج الإيبوكسي
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20KV محول توزيع مغمور بالزيت
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محول طاقة مغمور بالزيت بجهد 35 كيلو فولت
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6-10KV محول توزيع الطاقة مغمور بالزيت
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محول تيار – 10KV عالي الجهد داخلي
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محول تيار–LMZK محول تيار ملفوف 300/5a
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محول تيار - LSY-10 محول CT مدمج
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محول تيار–LXK عالي الجهد تسلسل صفري
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محول توزيع جاف - 6-10 KV سلسلة SCB من راتنج الإيبوكسي المصبوب
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المحولات الكهربائية–JDZ – 10 جهد الطاقة
What Is an On Load Tap Changing Power Transformer?
An on load tap changing (OLTC) power transformer adjusts its ratio under load, holding output voltage within tolerance as the network voltage varies. It is essential for transmission, regional distribution and large industrial supplies.
Utilities and large industrial customers specify OLTC transformers where voltage stability matters – grid interconnection, regional substations and continuous process plants.
- On-load voltage regulation – ratio adjusted under load to hold output voltage.
- 1000 kVA – 63000 kVA – capacity range for grid and industrial duty.
- 35-132 kV class – voltage classes for regional supply.
- 50,000m² factory – in-house winding, vacuum drying and testing.
- 350+ employees – engineering, production and export teams.
- OEM / ODM & wholesale – custom branding, packaging and volume supply.
Main Types of OLTC Power Transformers
We manufacture OLTC transformers in three configurations:
Grid power transformer
35-132 kV class units for regional distribution and interconnection.
Industrial power transformer
OLTC units for continuous process plants and large loads.
Substation transformer
Complete units for transmission and distribution substations.
OLTC Power Transformer Specifications
| المعامل | Specification |
|---|---|
| الجهد المقنن | 35 kV – 132 kV class |
| السعة المصنفة | 1000 kVA – 63000 kVA |
| محول التغيير | On-load, ±8×1.25% typical |
| التردد | 50/60 هرتز |
| التبريد | ONAN / ONAF / OFAF |
| معيار | IEC 60076 / GB 1094 |
OLTC Transformer Manufacturing at Our 50,000 m² Factory
From winding to OLTC integration, vacuum drying, oil filling, assembly and testing – every unit is built and tested at our Xuzhou facility.
Production Workshop
Controlled winding, core processing and vacuum drying with quality checkpoints between every stage, so quality is built in from the start.
Quality & Testing Center
Routine inspection on every unit before delivery, with type test reports supporting project approval and market certification.
Materials & Components
Core materials, windings and components are checked against the approved bill of materials on every production run.
OEM / ODM / Agency Supply
Custom branding, packaging and configurations for global partners – from nameplate to complete product design – supported by a dedicated export team.
OEM/ODM & Wholesale OLTC Power Transformer Supply
Utilities and distributors can brand or resell OLTC units with custom nameplates, packaging and documentation.
OEM / ODM
Factory-Direct
Custom branding, packaging and product variants built on our standard platforms – from a nameplate to full product design.
Custom nameplate · Custom packaging · Full test docs
Wholesale Supply
Volume Pricing
Factory pricing with flexible container quantities, mixed models per container and reliable global shipping for volume buyers and importers.
Container MOQ · Mixed models · Global shipping
Distributor Support
Channel Partners
Dedicated account management, technical documentation and priority production for distributors and project clients.
Account manager · Sales material · Priority lead times
On Load vs No Load Tap Changing Transformers
OLTC transformers regulate voltage continuously under load, protecting downstream equipment and improving power quality – at higher cost and maintenance. No-load units are simpler and cheaper where voltage is stable.
The choice follows your network’s voltage profile; we build both and confirm the right configuration on drawings.
Choosing an On Load Tap Changing Power Transformer Manufacturer
OLTC transformers demand higher engineering: tap winding design, OLTC integration and thermal performance. Verify type test evidence and utility reference deliveries.
Subian Electric offers a 50,000m² factory, 350+ employees, ISO9001, CE and UL certification and export to 50+ countries with OLTC engineering capability.
Request a quotation with your voltage, capacity and regulation requirements – we confirm the design before production.
Certifications & Quality Assurance
Our OLTC transformers are produced under ISO9001, ISO14001 and ISO45001 management systems, with CE and UL certification and type test reports to 110 kV class.
Product Certifications
On Load Tap Changing Transformer FAQ
Common questions about OLTC power transformers and factory sourcing.
ما هو محول التحويل تحت الحمل؟
When do I need an OLTC transformer?
What tap ranges are available?
What maintenance does an OLTC require?
How does an on-load tap changer work?
What are your delivery terms?
Contact Subian
Need the Right Specification?
Tell us your target market, product type, quantity and technical requirements. Our team will help you identify a suitable configuration for your project.