• Product advantages
• Product parameters
• Ordering instructions

Product advantages

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6kV Three-phase Power Distribution Transformer Overview

• This 6kV three-phase distribution transformer is a high-efficiency, low-loss power distribution equipment tailored for medium-voltage power grid systems. It adopts high-quality silicon steel sheets and anaerobic copper windings, featuring stable performance, low noise, low energy consumption and strong overload capacity.

• Available in oil-immersed and dry-type structures, with a capacity range of 50kVA–25000kVA. Customizable voltage ratios and specifications to adapt to industrial power supply, urban and rural grid distribution, commercial and residential power supply scenarios.

• Compact structure, easy installation and maintenance, long service life, meeting continuous and stable power operation requirements for various power distribution projects.

6kV Three-phase Power Distribution Transformer Certification & Compliance Standards

• International Standards: Fully compliant with IEC 60076 international power transformer standards

• Quality System Certification: ISO 9001 quality management system certification

• Overseas Market Certifications: CE, CB, EAC, KEMA certification, supporting global market access

• Domestic Standards: Comply with GB/T 1094 national standards for power transformers

6kV Three-phase Power Distribution Transformer Exported Countries & Regions

• The product has been successfully exported to dozens of countries and regions worldwide, covering Southeast Asia, Central Asia, South Asia, Europe and other mainstream power markets.

Typical exported regions include: Vietnam, Indonesia, Laos, Pakistan, Uzbekistan, Kazakhstan, Kyrgyzstan, Mongolia and other countries, accumulating rich overseas project delivery experience.


6kV Three-phase Power Distribution Transformer Case




6kV Three-phase Power Distribution Transformer FAQ
1. Standard & Certification

Q1: What international standards do your 6kV oil-immersed transformers comply with? Are they suitable for industrial and park local grid connection specifications?
A1: Our 6kV oil-immersed transformers are designed, type-tested and factory-inspected in strict accordance with IEC 60076 and IEC 60296 dedicated standards for oil-immersed power transformers, fully applicable to medium and low-voltage industrial power distribution scenarios. Meanwhile, we can adapt to various national local standards, including GB, EN, GOST, ANSI/IEEE, AS/NZS, INMETRO, SABS, KEBS, SASO and more. 6kV equipment is widely used in power distribution networks of factories, mines and commercial parks without strict grid connection thresholds for high-voltage equipment. Customers only need to provide the project country, local power bureau and owner’s special technical specifications. We will quickly complete standard compliance verification and provide full sets of compliance certificates and technical documents.
Q2: Can you provide complete third-party type test reports and factory witnessed test reports? Is on-site witness inspection supported?
A2: Complete CNAS-accredited type test reports are available, covering core test items for 6kV transformers, including temperature rise test, no-load and load loss measurement, impedance voltage test, power frequency withstand voltage test, lightning impulse test and short-time short-circuit withstand test. For large-scale industrial and mining projects and centralized park power distribution projects, pre-booked Factory Witnessed Test (WTT) is supported. We accept on-site full-process witnessed testing by owners, EPC general contractors and third-party institutions such as SGS and BV, with exclusive witnessed test reports provided.
Q3: Do you provide full English technical documents? Can you customize multi-language manuals?
A3: Standard delivery includes complete English technical documents, such as English nameplate, general arrangement drawing, wiring schematic diagram, factory FAT report, operation and maintenance manual, spare parts list and material qualification certificate. For overseas engineering projects, customized technical and operation manuals in Spanish, Portuguese, Arabic, French, Russian and other languages are available to meet local construction, filing and annual inspection requirements.

2. Technical Performance

Q4: Do 6kV transformers adopt copper or aluminum windings? Can material quality guarantee be specified in the contract?
A4: Both oxygen-free pure copper windings and high-quality aluminum windings are optional, selected according to project budget, load conditions and service life requirements. Winding materials and process parameters can be clearly specified in the technical agreement and formal sales contract, supported by raw material test certificates, production traceability records and factory re-inspection reports. 6kV transformers adopt low-voltage reinforced insulation structure, which adapts to frequent start-stop load conditions of industrial equipment, ensures high long-term operational stability and avoids partial discharge and excessive insulation aging.
Q5: Are all electrical parameters of 6kV transformers customizable? How do you handle non-compliant products?
A5: All core electrical parameters are fully customizable, including no-load loss, load loss, short-circuit impedance, tap range, temperature rise limit and insulation grade, which can fully match customer project datasheets. Every 6kV oil-immersed transformer undergoes 100% full-item factory testing to strictly control the operation accuracy of low-voltage distribution equipment. All non-compliant products are prohibited from delivery. We provide free rework, debugging or full machine replacement with full coverage of material and schedule costs to ensure zero risk of project commissioning for customers.
Q6: Are the transformers applicable for harsh working conditions such as high altitude, coastal salt spray, high humidity, seismic zones and dusty industrial sites?
A6: We provide comprehensive customized solutions for harsh working conditions suitable for mainstream industrial application scenarios of 6kV equipment. Enhanced insulation design is adopted for high-altitude areas to avoid low-voltage insulation breakdown problems. C5-grade heavy anti-corrosion coating is applied for coastal areas to resist salt spray and rust. Fully sealed tank structure is equipped for humid and rainy areas to prevent moisture intrusion. Mechanical reinforcement and shock absorption optimization are designed for mining and seismic zones, and upgraded dust-proof sealing is available for dusty industrial sites. All modifications are customized according to actual on-site working conditions for optimal adaptability.
Q7: Are 6kV oil-immersed transformers suitable for distributed PV and wind farm grid connection? What about harmonic resistance performance?
A7: Our harmonic-resistant 6kV transformers are specially developed for distributed new energy projects and factory self-owned power stations, adapting to the load characteristics of small and medium-sized PV and wind power grid connection. By optimizing core lamination technology and winding structure, the transformers effectively suppress harmonic heating, voltage distortion and current fluctuation caused by intermittent and fluctuating new energy loads. They can stably adapt to industrial and commercial distributed new energy grid connection and factory self-power generation systems, and resist harmonic interference from various frequency conversion and rectification equipment.
Q8: What is the standard noise level? Can low-noise customization be provided for residential and factory living areas?
A8: Under IEC standard test conditions, the standard operating noise of 6kV oil-immersed transformers is ≤55dB, superior to high-voltage equipment of the same specification. Low-noise version (≤48dB) is optional for residential areas, municipal supporting projects, factory living areas, schools and hospitals. By installing shock-absorbing pads, optimizing core noise reduction structure and improving oil tank shock absorption design, the operating noise is greatly reduced. Exclusive noise test qualification certificates can be provided.
Q9: Can 6kV transformers withstand lightning impulse and sudden short-circuit faults? Are they applicable to industrial grid fault conditions?
A9: The equipment adopts 6kV dedicated standard lightning impulse insulation design, which can effectively resist lightning overvoltage and switching overvoltage, suitable for outdoor industrial power distribution scenarios. Reinforced winding fixation, core fastening and lead wire reinforcement structures greatly improve the withstand capability of sudden short-circuit faults. The transformers can cope with frequent load fluctuations and sudden short-circuit faults of industrial and mining power grids, fully complying with global industrial distribution grid operation specifications. Short-circuit withstand test reports are available upon request.
Q10: What is the design service life? Does the insulation system comply with standard aging rules?
A10: The standard design service life is 20 years. Compared with ordinary civil transformers, industrial-grade 6kV transformers have larger insulation margin, and the service life can reach 25–30 years with regular maintenance. The equipment adopts high-quality oil-paper composite insulation system, which strictly follows the 6℃ insulation aging principle. Sufficient temperature safety margin slows down insulation aging under long-term load operation and ensures stable long-term operation.
Q11: Are you a genuine manufacturer of 6kV oil-immersed transformers?
A11: We are a professional transformer manufacturer based in Qingdao, China, with decades of experience in R&D and production of medium and low-voltage distribution transformers. We own complete dedicated production lines for 6kV equipment, with core components including iron cores, windings, insulating parts and oil tanks produced in-house without outsourcing. Our products are mainly applied in industrial, mining, park and distributed new energy power distribution scenarios, exported to countries worldwide for global EPC, industrial and mining enterprise and power engineering clients. Factory audits are always welcome.

3. Customization, Dimension & Transportation

Q12: Do you support non-standard customization of 6kV oil-immersed transformers? What configurations can be customized?
A12: Full-dimensional non-standard customization is supported for various special industrial scenarios. Customizable items include electrical parameters, off-load/on-load tap range, overall dimensions, floor-mounted/hanging/base installation methods and special environmental adaptation configurations. Core accessories such as high and low voltage bushings, temperature controllers, cooling fans and pressure relief valves can be equipped with customer-specified international brands. All non-standard customized parameters and requirements are documented in exclusive technical agreements to achieve 100% matching with project demands.
Q13: Can you provide equipment weight and dimension drawings? Are the transformers suitable for cross-border sea and land transportation?
A13: Accurate net weight, gross weight, overall dimensions, installation dimension drawings and hoisting parameters are provided together with formal quotations. Most 6kV transformers are medium and small-capacity models with compact size and controllable weight, without oversize transportation risks. For cross-border projects, we evaluate transportation schemes in advance and provide professional guidance for hoisting, fixing and loading, adapting to sea freight, railway and cross-border truck transportation to ensure delivery safety.
Q14: What packaging is adopted for 6kV oil-immersed transformers? Is it suitable for long-distance ocean transportation?
A14: Standard medium and small-capacity 6kV transformers adopt full oil-sealed delivery, enabling quick on-site commissioning after arrival to shorten the project cycle. For long-distance ocean transportation and bumpy transshipment scenarios, oil-drained and nitrogen-filled protection is optional, equipped with high-precision impact recorders to monitor vibration, inclination and temperature and humidity changes throughout transportation. It effectively protects windings and insulation systems from moisture, damage and deformation. All export wooden cases have IPPC fumigation marks to meet international quarantine standards.

4. Production & FAT Acceptance

Q15: What is the production lead time? How to guarantee on-time delivery?
A15: The lead time for standard 6kV oil-immersed transformers is 12–20 working days; customized models with harsh environment adaptation or special accessories take 20–35 working days. The exact delivery time is confirmed in the contract. We update production, quality inspection and stocking progress in stages with exclusive delivery files. Contractual clauses are adopted to lock delivery time and control delay risks to ensure on-time project commissioning.
Q16: Do you support on-site FAT witnessing by customers or third-party institutions?
A16: On-site acceptance by customers and full-process FAT witnessing by third-party institutions (SGS, BV, TUV, etc.) are fully supported. We arrange the schedule flexibly according to customer demands, open workshops and inspection stations completely, and provide complete production records, raw material certificates, process test reports and factory test data. The transparent acceptance process fully supports customer factory verification.
Q17: Are core components traceable? Are key production processes outsourced?
A17: All core components including iron cores, windings, insulating materials, oil tanks and temperature control systems have batch traceable codes, factory certificates and test reports for full-process traceability. Critical processes such as winding assembly, insulation installation, vacuum oil filling, partial discharge testing and overall machine testing are all completed in-house without outsourcing, ensuring stable and consistent product quality from the source.

5. Quotation, Payment & Customs Clearance

Q18: How long is the quotation valid? Will raw material price fluctuations affect the quotation?
A18: The standard quotation is valid for 15 days with fixed prices, not affected by fluctuations in copper, silicon steel and other raw material prices. For large-batch industrial projects and long-term strategic cooperation projects, the quotation validity can be extended to 90–180 days. Expired quotations will be reissued for free upon request.
Q19: What payment terms do you accept? Is L/C acceptable?
A19: Flexible payment methods are available, including TT telegraphic transfer and irrevocable sight letter of credit (L/C). Advance payment ratio and commercial terms can be negotiated according to project scale, cooperation cycle and order quantity. All business terms are clearly specified in formal foreign trade contracts to protect bilateral interests.
Q20: Can you issue certificates of origin to help customers enjoy tariff preferences?
A20: We provide various customs clearance documents including CO general certificate of origin, FORM E and FORM A. These documents help overseas customers complete customs clearance, tariff reduction and tax rebate applications efficiently, reduce import costs and ensure smooth customs clearance.

6. Packaging, Logistics & Insurance

Q21: What is the export packaging standard? Is it suitable for long-distance ocean freight?
A21: All exported 6kV transformers adopt dedicated foreign trade packaging with multi-layer anti-rust, moisture-proof, shockproof and anti-collision protection, adapting to long-distance ocean transportation with bumpy, high-humidity and salt spray environments. All wooden cases pass IPPC fumigation and carry exclusive identification marks, meeting global import quarantine standards without customs clearance barriers.
Q22: What logistics solutions are available for different overseas projects?
A22: We provide customized multi-scenario logistics solutions: ocean freight for most global projects, China-Europe railway transportation for inland Eurasian projects without ports, cross-border truck transportation for short-haul neighboring country projects, and bulk carrier transportation for large-batch equipment. We recommend the optimal logistics solution based on equipment size, project location and delivery time requirements.
Q23: What is the cargo damage claim process? Do you provide full-process assistance?
A23: All exported equipment is fully insured for the entire transportation process, covering sea, land and railway freight. Customers shall collect on-site evidence and submit an insurance application within 48 hours after cargo arrival. We provide full supporting documents including customs declaration papers, transportation documents and quality inspection reports, and cooperate with third-party loss assessment and verification to accelerate claim settlement and minimize customer losses.

7. SAT & Commissioning Service

Q24: Do you provide overseas on-site installation, commissioning and SAT acceptance services?
A24: We provide global on-site technical services including installation guidance, equipment commissioning, power-on testing, fault troubleshooting and SAT acceptance, with separate customized quotations for overseas on-site services. Meanwhile, 24/7 free remote technical support is always available to solve installation, commissioning and operation problems at any time.

8. Warranty & After-sales Service

Q25: What is the warranty period and coverage?
A25: The standard warranty period is 1 year, which can be extended to 2–5 years for grid supporting, large EPC and key industrial and mining projects. The warranty covers manufacturing defects and original accessory faults. Damages caused by improper operation, overload operation, external impact damage and unauthorized equipment modification are excluded from the warranty scope.
Q26: Can you supply original spare parts after the warranty expires?
A26: We provide lifelong supply of original spare parts for wearing components such as temperature controllers, seals, bushings and pressure relief valves. All spare parts are 100% compatible with original equipment to ensure long-term stable operation without maintenance worries.
Q27: What is the response time for technical support? How to handle emergency faults?
A27: 24/7 online technical consultation and fault troubleshooting services are provided with instant response for conventional problems. On-site maintenance service can be arranged within 7–12 working days upon negotiation. For emergency faults such as equipment shutdown and tripping, we activate the emergency response mechanism with priority processing to minimize customer production losses.
Q28: What is your factory quality control system? How do you guarantee product quality?
A28: Our factory implements the full-process ISO9001 quality management system, establishing complete quality inspection standards covering raw material incoming inspection, in-process production, semi-finished product testing, overall assembly and factory testing. Every 6kV oil-immersed transformer passes full-item tests in accordance with national and international standards before delivery with zero unqualified products. We fully support incoming quality inspection, annual factory audit and order sampling inspection by third-party institutions such as BV, SGS and TUV.

Product parameters

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- Input voltage: 6kV

  - Output voltage: 0.4kV 0.415 kv 0.420kv 0.430kv 0.440kv
  - Capacity: 30-2500 kva
  - Frequency: 50/60 HZ
  - Remark: voltage, capacity, frequency, connection group and loss can be customized according to customer requirements

S11     额定容量Capacity	额定电压及分接范围Rated voltage&Off-load tapping				联结组标号 Vector  GroupSymbol		空载损耗 NO-load loss（W）	负载损耗 Load loss（W）	空载电流 NO-load current（%）	短路阻抗Short  circuit impedance(%)
	高压 H.V(kv)	高压分接范围  High pressure   Tap range（%）		低压 L.V(kv)
30 kva	11 10.5 10 6.3 6	±5% ±2x2.5%		0.4 0.415 0.420 0.430 0.440	Dyn11 Yyn0		100	630/600	1.5	4
50 kva							130	910/870	1.3	4
63 kva							150	1090/1040	1.2	4
80 kva							180	1310/1250	1.2	4
100 kva							200	1580/1500	1.1	4
125 kva							240	1890/1800	1.1	4
160 kva							280	2310/2200	1	4
200 kva							340	2730/2600	1	4
250 kva							400	3200/3050	0.9	4
300 kva							480	3830/3650	0.9	4
400 kva							570	4520/4300	0.8	4
500 kva							680	5410/5150	0.8	4
630 kva							810	6200	0.6	4.5
800 kva							980	7500	0.6	4.5
1000 kva							1150	10300	0.6	4.5
1250 kva							1360	12000	0.5	4.5
1600 kva							1640	14500	0.5	4.5
2000 kva							1940	18300	0.4	5
2500 kva							2290	21200	0.4	5

Ordering instructions

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- Main parameters of transformer (voltage, capacity, loss and other main parameters)
- Transformer operating environment (altitude, temperature, humidity, location, etc.)
- Other customization requirements (tap switch, color, oil pillow, etc.)
- The minimum order quantity is 1 sets, worldwide delivery within 7 days
- Normal delivery period of 30 days, worldwide fast delivery