About QDTB® Transformer
25 years of excellence in power equipment manufacturing
QDTB® Group Companies
A comprehensive power equipment industrial cluster
QDTB® is the registered brand of Shandong Yaqing Electrical Technology Co., Ltd., an approved member of China State Grid's qualified supplier brand library. Through its parent company and wholly-owned subsidiaries, the QDTB® Group covers the entire industrial chain — R&D, design, manufacturing, sales and service — delivering power transmission and distribution equipment under one roof.
Our roots trace back to 2001, when the founding company began manufacturing power equipment in Qingdao, Shandong. In 2015, the business was officially incorporated as Shandong Yaqing Electrical Technology Co., Ltd. Over 25 years, it has grown into one of China's leading manufacturers of power transmission and distribution equipment, with products trusted by China State Grid, the nation's largest grid operator.
Today, our 100,000 m² smart factory houses advanced production lines and testing laboratories, staffed by 500+ skilled professionals and delivering over 10,000 units per year. From raw material sourcing to final delivery, every process runs under strict quality control — backed by a 99.8% quality pass rate and 30+ patents.
We manufacture power transformers, prefabricated substations, high/low voltage complete equipment, ring main units, switchgear, distribution boxes, special transformers, voltage regulators and more — all built to IEC, IEEE and GB standards with full CE and ISO 9001 certification. Our equipment serves customers in 30+ countries across Southeast Asia, Europe, Africa and South America. From the first coil to the final test report, QDTB® earns the trust of energy companies worldwide.
100,000m² Smart Factory
State-of-the-art manufacturing facilities
Shandong Yaqing Electrical Technology Co., Ltd.
Core parent company, QDTB® brand owner
Sales, foreign trade & import/export
OEM manufacturing & processing
Shandong Nengjia Electric Power Design Co., Ltd.
Power engineering design services
Qingdao AIJIA Electronic Co., Ltd.
Insulation materials & electronic components
Overseas projects & international trade
Featured Projects & Global Deployments
Covering 0.4 kV – 220 kV — Proven across renewables, industrial, infrastructure & overseas markets
| Project Name | Year | Our Role | Core Scope & Equipment |
|---|---|---|---|
| Vietnam & Indonesia 52-Unit Transformer Export | 2024 | OEM Supplier | Custom-manufactured and exported 52 sets of distribution transformers (10kV–35kV, 50–1,600 kVA), including 15 sets of 35kV models, adapted to tropical climate. Full export logistics & customs clearance. |
| UAE Dubai Solar Park PV Substation | 2025 | OEM Supplier | 2 sets SFZ11-120MVA/110kV PV step-up transformers + 2 sets 110kV switchgear. Technology sample approved by regional partner for Dubai 2030 Energy Strategy. |
| Germany Industrial Dry-Type Transformer Order | 2025 | OEM Supplier | 45 sets CE-certified SCB10 (800–2,500 kVA) dry-type transformers, IEC 60076-11 compliant, fire class F, ≤45 dB low-noise design. |
| Philippines Commercial Complex Prefabricated Substation | 2024 | OEM Supplier | 8 sets ZBW-1600/10kV prefabricated substations, 36 sets 10kV ring main units, factory-assembled & tested, reduced on-site installation time by 70%. |
| Jiangsu 150MW Distributed PV Grid-Connected | 2025 | EPC Contractor | 85 sets S13-M-800/35kV solar transformers + 85 sets 35kV combination boxes + 40 sets 10kV cabinets. Smart monitoring for remote O&M. |
| Shandong 110kV Industrial Park Power Supply | 2024 | Solution Provider | 2 sets 110kV prefabricated substations (2×63MVA) + 180 sets 10kV switchgear + 24 sets S11-M-1600/10 distribution transformers. One-time commissioning success. |
| Zhejiang 500MW Industrial PV + 110kV Step-up | 2026 | Equipment Supplier | 156 sets S13-M-1000/10kV PV transformers + 12 sets 110kV/10kV step-up transformers (63MVA). 30-day delivery cycle with on-site commissioning. |
Vietnam & Indonesia 52-Unit Transformer Export
2024OEM Supplier
Custom-manufactured and exported 52 sets of distribution transformers (10kV–35kV, 50–1,600 kVA), including 15 sets of 35kV models, adapted to tropical climate. Full export logistics & customs clearance.
UAE Dubai Solar Park PV Substation
2025OEM Supplier
2 sets SFZ11-120MVA/110kV PV step-up transformers + 2 sets 110kV switchgear. Technology sample approved by regional partner for Dubai 2030 Energy Strategy.
Germany Industrial Dry-Type Transformer Order
2025OEM Supplier
45 sets CE-certified SCB10 (800–2,500 kVA) dry-type transformers, IEC 60076-11 compliant, fire class F, ≤45 dB low-noise design.
Philippines Commercial Complex Prefabricated Substation
2024OEM Supplier
8 sets ZBW-1600/10kV prefabricated substations, 36 sets 10kV ring main units, factory-assembled & tested, reduced on-site installation time by 70%.
Jiangsu 150MW Distributed PV Grid-Connected
2025EPC Contractor
85 sets S13-M-800/35kV solar transformers + 85 sets 35kV combination boxes + 40 sets 10kV cabinets. Smart monitoring for remote O&M.
Shandong 110kV Industrial Park Power Supply
2024Solution Provider
2 sets 110kV prefabricated substations (2×63MVA) + 180 sets 10kV switchgear + 24 sets S11-M-1600/10 distribution transformers. One-time commissioning success.
Zhejiang 500MW Industrial PV + 110kV Step-up
2026Equipment Supplier
156 sets S13-M-1000/10kV PV transformers + 12 sets 110kV/10kV step-up transformers (63MVA). 30-day delivery cycle with on-site commissioning.
Why Choose QDTB
25 years of power equipment manufacturing excellence. QDTB is your trusted transformer and substation supplier.
Direct Manufacturer
100,000m² facility with 500+ employees. Full process control from raw materials to finished products.
Full Certifications
ISO 9001 certified, CE marked. Products comply with IEC 60076/IEC 61330/IEC 62271 standards.
Complete Product Range
10 categories covering transformers, prefabricated substations, switchgear with 6,000+ models.
Customization Capability
Professional engineering team for OEM/ODM services. Fully tailored to project requirements.
Global Delivery Experience
Exports to 30+ countries. Multi-language technical documentation and logistics support.
Full Lifecycle Service
End-to-end support from consultation, design, manufacturing to after-sales maintenance.
Transaction & Quality Guarantees
At QDTB® Transformer, we understand that cross-border procurement of large power equipment carries concerns over payment safety, manufacturing transparency and after-sales support. We have built a full-set guarantee system to protect both buyers and our factory throughout the whole project cycle.
Secure Payment & Platform E-signing
We support Alibaba Trade Assurance, the official B2B escrow service for industrial cross-border orders. All technical parameters, contract terms, quality standards and delivery timelines are formally locked on the platform. Buyer funds are held in a regulated third-party account and will only be released to us after the buyer confirms goods comply with contracted specifications. Disputes under Trade Assurance are judged strictly based on signed contracts, datasheets and official factory test reports. Meanwhile, Alibaba platform-based electronic contract signing is available to formalize your order, fully safeguarding the fundamental interests of customers.
Factory Verification & Production Transparency
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On-site factory audit: Customers are warmly welcome to visit our manufacturing facility for an on-site inspection.
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Video factory audit: Remote live video tour is supported for clients unable to travel to China.
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Full-process video archives: We provide video records covering key manufacturing stages, including raw material processing, winding, assembly, routine testing and packing, so you can track order progress remotely.
Customs-Related Assistance
Our team can offer professional documentation support and guidance for export customs clearance procedures to smooth your international shipment.
Comprehensive After-Sales Service
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Remote technical guidance is provided for transformer installation, commissioning and daily operation.
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For large-scale key projects, our professional engineers can travel to site to assist with on-site installation and commissioning (travel expenses to be discussed separately).
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Technical documents, operation manuals and test reports will be delivered together with goods.
If you have any questions regarding our guarantee terms, please feel free to contact our sales team.