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Complete power equipment solutions for generation, transmission, distribution, and utilization
Power Transmission & Distribution
Transformers, switchgear, substations and reactive compensation for power transmission and distribution networks.
Industrial Power & Control
Control transformers, voltage regulators, UPS and power supplies for industrial equipment and automation.
Solar Power and Energy Storage
PV modules, inverters, batteries and balance-of-system equipment for solar generation and energy storage projects.
Design Your System in Minutes
Pick a scenario and get a complete equipment list with FOB pricing — no sign-up needed.
Distribution System Calculator
Complete LV/MV distribution design: transformer sizing, HV/LV switchgear, cables, grounding and protection — IEC/NEC/GB compliant. Generates single-line diagrams & calculation sheets; outputs a full BOM and FOB price list.
Solar System Configurator
Utility and C&I solar sizing with map-based solar resource, P50/P75/P90 yield, string/inverter matching and full-cost LCOE.
Data Center Power System Calculator
Data center power: UPS runtime, PDUs, N+1/2N redundancy, cooling load and protection coordination. Generates single-line diagrams, schematics, grounding layouts, cable schedules & terminal diagrams; outputs a full BOM quote.
Oilfield Power System Calculator
Oilfield electrification: pumping units, ESP loads, injection pumps and off-grid genset sizing with protection coordination. Generates construction-grade single-line diagrams & schematics; outputs a BOM & reference price list.
PV Plant + Grid Interconnection Calculator
Utility-scale PV plant + grid interconnection: voltage level, main transformer, collector system, reactive power and substation BOM.
Industrial Park Power System Calculator
Industrial park master power plan: demand load, transformer count, MV distribution and whole-site cost roll-up. Generates construction-grade single-line diagrams & schematics; outputs a BOM.
Product Search
Find the right transformer for your needs
Tech Hub — Engineering Insights
Selection guides, technical comparisons and industry knowledge for power equipment buyers
Distribution Transformer Price Breakdown 2026: What a 100–2,000 kVA Transformer Really Costs (FOB Qingdao)
Real 2026 FOB Qingdao reference prices for oil-immersed S13-M and dry-type SCB13 distribution transformers from 100 to 2,000 kVA, with the copper-link mechanism explained so you can compare quotes fairly.
Distribution Transformer Selection & Price Guide 2026
Standard S13-M oil-immersed and SCB13 dry-type distribution transformers with full model numbers, descriptions and FOB Qingdao reference prices — computed from the anchored LME copper price ($14,185/ton, 2026-08-23).
FOB Quotation Breakdown: From Ex-Works Price to Qingdao Port — What Are You Really Paying For?
What a Chinese transformer supplier's FOB Qingdao quotation actually contains: copper-linked materials, manufacturing, testing, export packing, inland haulage and margin — with real 2026 price tables and a fair-comparison checklist.
Stop Comparing Initial Prices: How to Calculate Transformer Total Cost of Ownership (TCO)
The cheapest transformer is rarely the cheapest in the long run. A step-by-step TCO model covering purchase price, no-load and load losses, maintenance and lifetime — with real numbers showing why 20-year loss costs dwarf the invoice.
How to Size a Distribution System: Transformer, Switchgear and Feeders in One Calculation
Sizing the transformer is only one third of the job. The transformer's impedance sets the short-circuit current; the short-circuit current sets the breaker ratings and cable sizes; those set the protection settings. Follow one 800 kVA project through the full chain — load list, transformer, short-circuit current, switchgear, feeders and protection coordination — with real 2026 FOB prices and ready-to-use formulas.
How to Choose the Right Voltage Class: 6/10/11/20/33 kV for Distribution Transformers
Distribution transformers come in 6, 10, 11, 20 and 33 kV primary classes. A practical guide to matching voltage class to your grid, load size, distance and equipment — with the tap-range factor that buyers often miss.
Transformer Protection Devices Guide: Buchholz Relay, Pressure Relief and Temperature Indicators — What Your Unit Must Be Fitted With
Every oil-immersed distribution transformer must carry a minimum protection set — a Buchholz relay, a pressure relief device (PRD), and a winding temperature indicator (WTI) — that together catch internal faults, overpressure, and overheating; oil level indicators, silica-gel breathers, and external overcurrent relays complete the package (IEC 60076 / GB 1094, as of 2026).
Transformer Delivery Lead Time: How Long It Really Takes to Manufacture and Ship a Distribution Transformer (2026)
Transformer delivery lead time explained for overseas buyers: a standard oil-immersed distribution transformer takes 30–45 days to manufacture and 20–40 days by sea freight from Qingdao — 60–90 days door-to-door; custom units add 10–20 days and power transformers (≥10 MVA) run 60–120 days (as of 2026, FOB Qingdao).
Transformer Warranty Terms: What a Real Warranty Covers (and the 5 Clauses to Negotiate Before You Pay)
Transformer warranty terms explained for overseas buyers: what a standard 12–24 month warranty actually covers, the 5 clauses to negotiate (scope, exclusions, claim deadline, freight split, defect response time), and the real costs — warranty itself is 0% of price, but freight on a claim typically runs 3–8% of unit value (as of 2026, FOB Qingdao).
Certifications & Project Experience
Internationally certified, with equipment delivered to power, industry and infrastructure projects worldwide
China State Grid Supplier
Qualified supplier to State Grid Corporation of China
China Electrical Industry Association Member
Member of the China Electrical Industry Association
CE + IEC + CCC
CE marking, IEC standards and CCC certification
52-Unit Distribution Transformer Export
52 sets of 10kV–35kV distribution transformers (50–1,600 kVA) custom-built for tropical climates, with full export logistics and customs clearance.
Dubai Solar Park PV Substation
2× SFZ11-120MVA/110kV PV step-up transformers and 2× 110kV switchgear for a Dubai solar park, aligned with the Dubai 2030 Energy Strategy.
Industrial Dry-Type Transformer Order
45 sets of CE-certified SCB10 dry-type transformers (800–2,500 kVA), IEC 60076-11 compliant with F-class insulation and ≤45 dB low-noise design.
Prefabricated Substations for a Commercial Complex
8× ZBW-1600/10kV prefabricated substations and 36× 10kV ring main units, factory-assembled to cut on-site installation time by 70%.
Quality Delivery, Transformer Builder
QDTB is a registered trademark of Shandong Yaqing Electrical Technology Co., Ltd. and a member of the State Grid of China supplier pool. and Member of the China Electrical Industry Association.
Our service areas include power transmission & distribution, PV-ESS-EV charging, wind power, urban power grid, IDC data centers, heavy industry (oilfields, petrochemical plants, mines, etc.) and EPC projects.
We firmly believe transparent pricing is the first step to sincere service.
Why Choose QDTB® Transformer
QDTB® Transformers is a one-stop supplier of conventional and solar power equipment, providing power distribution system design, transformers, switchgear, substations and solar systems for projects worldwide. With over 25 years of experience, we operate a 100,000㎡ modern production facility equipped with advanced CNC machinery and automated production lines. Our commitment to quality is reflected in our ISO 9001/14001/45001 certifications and 99.8% quality pass rate. We serve customers in over 30 countries across Southeast Asia, Europe, Africa, and South America, providing reliable power equipment solutions for diverse applications.
Learn More About UsComplete Power Equipment Solutions
QDTB provides customized power equipment solutions across new energy and industrial sectors, covering our full range of prefabricated substations, compact substations, and package substations.
Solar PV Solutions
Oil-immersed transformers & prefabricated substations for utility-scale solar power plants — compact substation design for 10 kV / 35 kV grid connection.
View SolutionWind Power Solutions
Step-up transformers & switchgear for onshore and offshore wind farms — robust power equipment for 0.69 kV to 35 kV collector systems.
View SolutionPV + Storage + Charging
Integrated solar + storage + EV charging power equipment — transformers, PCS and switchgear for combined solar-storage-charging stations.
View SolutionIndustrial Manufacturing
Energy-efficient distribution transformers & LV switchgear for factories — reliable power equipment for continuous industrial production.
View SolutionUrban Infrastructure
Compact low-noise transformers & ring main units for urban power supply — ideal for dense city distribution networks.
View SolutionRenewable Energy
Specialized transformers for solar & wind projects — power equipment built for renewable energy grid integration.
View SolutionMining & Heavy Industry
Rugged transformers & switchgear for harsh mining environments — heavy-duty power equipment for high-load mining operations.
View SolutionOverseas EPC Projects
One-stop transformer & substation supply for turnkey projects — complete power equipment packages for overseas EPC contractors.
View SolutionPublic Facilities
Ultra-reliable power equipment for hospitals, schools & airports — transformers with high safety standards for critical public infrastructure.
View SolutionFrequently Asked Questions
Common questions from international buyers about our products, services, and capabilities
What is the typical lead time for transformer orders?
Standard transformers: 30-45 days. Custom or large-capacity units: 60-90 days. This is significantly faster than Western manufacturers who typically require 18-24 months. Rush orders can be accommodated for urgent projects.
Do you provide OEM/ODM services?
Yes. We offer full OEM/ODM capabilities including custom design, private labeling, and specification modifications to meet your specific project requirements and local standards.
What certifications do your products hold?
Our products are ISO 9001/14001/45001 certified, CE marked on selected models, and designed to meet IEC, IEEE, and GB standards.
What is your minimum order quantity?
We accept orders starting from 1 unit for standard products. For custom-designed equipment, please contact our sales team for MOQ details based on specifications.
Do you provide after-sales technical support?
Yes. We provide comprehensive after-sales support including installation guidance, commissioning assistance, operator training, and 24/7 remote technical support. On-site service is available globally.
Can you customize products for specific environments?
Absolutely. We design equipment for extreme conditions including high altitude, high temperature, high humidity, coastal/corrosive environments, and seismic zones. Share your requirements and we will engineer a solution.
What payment terms do you accept?
We accept T/T (bank transfer), L/C (letter of credit), and other major international payment methods. Typical terms are 30% deposit with 70% before shipment. We can discuss flexible terms for long-term partnerships.
Do you provide technical documentation in English?
Yes. All products come with comprehensive English documentation including user manuals, technical specifications, test reports, and installation guides. We also provide CE and other certification documents as needed.
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Run the numbers first, then send your inquiry — generate your equipment list and FOB price with our free calculators, and get a detailed quotation from our engineers within 24 hours.