Product Description
S-35kV series oil immersed transformer produced by the company is suitable for three-phase AC 50 / 60Hz, rated voltage 35kV distribution grid, and plays an important role in high-voltage transmission and low-voltage power supply. Products with high efficiency, low loss characteristics, can save a lot of power consumption and operating costs, social benefits, have been widely used in power plants, substations, industrial and mining enterprises, ports, airports and other places. With on load tap changer, the product can realize the function of manual or automatic voltage regulation without power failure, which is conducive to stabilizing the voltage of power grid in each load center and improving the quality of power supply.
Model Meaning
Standards
IEC60076-1:2011 Power transformers - Part 1: General
IEC60076-2:2011 Power transformers - Part 2: Temperature rise for liquid-immersed transformers
IEC 60076-3:2013+AMD1:2018 Power transformers - Part 3: Insulation levels, dielectric tests and external clearances in air
IEC 60076-5:2006 Power transformers - Part 5: Ability to withstand short circuit
IEC 60076-10:2016 Power transformers - Part 10: Determination of sound levels
Normal Environment conditions
Ambient Temperature: No more than +40℃, No less than -25℃, The monthly average temperature is no more than +30℃., The yearly average temperature is no more than +20℃.
Altitude: No more than 1000m.
The power supply voltage's wave is similar to a sine wave.
Three-phase power supply voltage is approximately symmetrical.
The total harmonic content of load current shall not exceed 5% of rated current;
Installation Site: Indoor or outdoor.
Product characteristic
The core is made of cold-rolled silicon steel sheet with high magnetic conductivity and grain orientation, with low no-load loss.
The three-phase winding is concentric coil, corrugated oil duct, no paint dipping process and tight band binding are adopted. High mechanical strength, balanced ampere turn distribution, strong short circuit resistance.
The positioning structure is added to the body to avoid displacement during transportation. At the same time, all fasteners are equipped with fastening nuts to ensure that the fasteners are not loose during long-term operation.
This product is a fully sealed structure. The vacuum oil filling process is adopted when the transformer is packaged, which completely removes the moisture in the transformer, ensures the isolation of the transformer oil from the outside air, prevents the aging of the oil, and improves the operation reliability of the transformer. All transformers of the capacity section are equipped with pressure relief valves, and gas relays with alarm and trip functions can be installed according to user's demand, which ensures the safe operation of transformers.
Corrugated oil tank is adopted. This kind of oil tank has the advantages of simple processing, high mechanical strength, good welding effect and no leakage. And because of the strong fluidity of the oil, the heat dissipation capacity of the product is improved.
The product is beautiful in appearance, small in volume and small in floor area. It is an ideal maintenance free product.
Technical Parameters
S1135KV oil immersed power transformer(50kVA~1600KVA three-phase double winding non-exciation voltage regulating distribution transformer)
| Rated
Capacity (kVA) | Voltage combination and tap range | Junction group
label | Load loss
(W) | Load loss
(W) | No-load
Current (%) | Short circuit
impedance (%) |
| (H.V.) | High voltage tap
range(%) | (L.V.) |
| 50 |
35 38.5 |
±5 ±2×2.5% |
0.4 |
Dyn11 YynO | 130 | 1200/1140 | 1.30 | 6.5 |
| 100 | 185 | 2010/1910 | 1.10 | 6.5 |
| 125 | 215 | 2370/2260 | 1.10 | 6.5 |
| 160 | 225 | 2820/2680 | 1.00 | 6.5 |
| 200 | 270 | 3320/3160 | 1.00 | 6.5 |
| 250 | 320 | 3950/3760 | 0.95 | 6.5 |
| 315 | 385 | 4750/4530 | 0.95 | 6.5 |
| 400 | 465 | 5740/5470 | 0.85 | 6.5 |
| 500 | 545 | 6910/6580 | 0.85 | 6.5 |
| 630 | 665 | 7860 | 0.65 | 6.5 |
| 800 | 785 | 9400 | 0.65 | 6.5 |
| 1000 | 920 | 11500 | 0.65 | 6.5 |
| 1250 | 1120 | 13900 | 0.60 | 6.5 |
| 1600 | 1350 | 16600 | 0.60 | 6.5 |
| 2000 | 1590 | 19700 | 0.55 | 6.5 |
| 2500 | 1890 | 23200 | 0.55 | 6.5 |
Note:
1.For transformers with rated capacity of 500KVA and below,the load loss value above the dagona line in the tables applicable to the Dyn11 comection group.
2.according to user needs,can provide high voltage tapping range of±2×2.5%of the transformer.
S1135KV oil immersed power transformer(630kVA~31500KVA three-phase double winding group non-excitation voltage regulating power transformer)
| Rated
Capacity (kVA) | Voltage combination and tap range |
Junction group label |
Load loss (W) | Load loss
(W) | No-load
current (%) | Short circuit impedance
(%) |
| (H.V.) | High voltage tap
range(%) | (L.V.) |
| 8000 |
35~38.5 |
±2×2.5% |
6.6 1.05 11 |
Yd11 | 7200 | 38480 | 0.42 | 7.5 |
| 10000 | 8700 | 45320 | 0.42 | 7.5 |
| 12500 | 10080 | 53870 | 0.40 | 8.0 |
| 16000 | 12160 | 65840 | 0.40 | 8.0 |
| 20000 | 14400 | 79520 | 0.40 | 8.0 |
| 25000 | 17020 | 94050 | 0.32 | 8.0 |
| 31500 | 20220 | 112860 | 0.32 | 8.0 |
Note 1:The external dimensions are designed according to the specific needs of the user.
SZ1135KV on-load tap change oilimmersed power transformer(2000kVA-20000KVA on-load tap change power transformer)
| Rated
Capacity (kVA) | Voltage combination and tap range |
Junction group label |
Load loss (W) |
Load loss (W) | No-load
current (%) | Short circuit impedance
(%) |
| (H.V.) | High voltage tap
range(%) | (L.V.) |
| 2000 | 35 | ±3×2.5 | 6.310.5 |
| 2300 | 19240 | 0.80 | 6.5 |
| 2500 | 2720 | 20640 | 0.80 | 6.5 |
| 3150 |
35~38.5 |
±3×2.5 |
6.3 10.5 | Yd11 | 3230 | 24710 | 0.72 | 7.0 |
| 4000 | 3870 | 29160 | 0.72 | 7.0 |
| 5000 | 4640 | 34200 | 0.68 | 7.0 |
| 6300 | 5630 | 36770 | 0.68 | 7.5 |
| 8000 |
| 7870 | 40610 | 0.60 | 7.5 |
| 10000 | 9280 | 48050 | 0.60 | 8.0 |
| 12500 |
35~38.5 |
±3×2.5 | 6.3 6.6 10.5 11 | Ynd11 | 10940 | 56860 | 0.56 | 8.0 |
| 16000 | 13170 | 70320 | 0.54 | 8.0 |
| 20000 | 15570 | 82780 | 0.54 | 8.0 |
Product Feature
Application:
DC resistance test is the necessary test item for a transformer handover before delivery, it is the ideal equipment to measure DC resistance of transformer winding and high-power inductive devices.
This series of products is relatively advanced in design, and has been greatly improved and improved in materials, structures and processes. The high and low pressure clamps are tensioned by steel straps or upper beams and side beams to form a strong frame structure that enhances the core clamping force and the ability to withstand transport shocks. It has strong anti-short circuit capability, beautiful appearance selection,reliable operation, low loss and low noise,reaching the advanced level of similar foreign products.
Features:
Executive standard
GB 1094.1~2″General Rules for Power Transformers””The Temperature of Oil-immersed Transformers” GB 1094.3″Insulation level,insulation test and external insulation air gap”
GB 1094.5″The ability of power transformers to withstand short circuits”
GB/T 6451″Technical parameters and requirements for oil-immersed power transformers” GB/T 15164 “Guidelines for Oil-immersed Power Transformers”
GB2536 “Transformer Oil”
QC & Guarantee
Quality Control and Assurance
We adhere to a market-oriented and customer-centric approach. In the highly competitive market, we have consistently earned the trust and recognition of our customers through exceptional product quality and efficient, comprehensive services.
Our solemn commitment to customers:
Long-lasting Durability: We ensure that the service life of the supplied transformers is no less than 30 years.
Full-process Quality Control: From the receipt of bid documents, we initiate a comprehensive evaluation to ensure complete alignment with customer requirements. All raw materials and components are sourced from certified suppliers, and strict quality control standards are implemented. The production process strictly follows contracts and technical agreements, ensuring every step meets high-quality standards.
Hassle-free After-sales Service: All performance indicators of our transformers exceed or comply with national standards. Within three years after product installation and commissioning, if oil leakage occurs in oil-immersed transformers due to manufacturing reasons, we will provide free repairs. For any critical component issues arising during production or installation, we will prioritize project progress, address them promptly, and subsequently conduct responsibility analysis and corrective actions. We also sincerely welcome customers to visit our production site for supervision and guidance.
After-sales Support System
We provide comprehensive after-sales support, including free installation and commissioning guidance. After the product is put into operation, if any assistance is required, our service team will respond quickly:
24/7 Technical Support: We offer round-the-clock online support, including video calls, troubleshooting guides, and technical documentation, ensuring timely assistance for global customers.
Remote Diagnostic Services: Remote detection and diagnostics can be performed based on data provided by customers or through real-time video.
Regular Follow-up Mechanism: We have established a robust regular follow-up system to monitor product operation status online or on-site, ensuring customers can use our products with continuous peace of mind.
On-site Services
For complex issues, we will promptly dispatch experienced engineers to the site within the agreed international response time, providing services such as installation guidance, commissioning, maintenance, and repairs.
Dedicated Service Representative
Each customer is assigned a dedicated service representative who coordinates after-sales support, issue resolution, and regular follow-ups, ensuring seamless service throughout the entire process.
Continuous Care
After installation, we conduct regular on-site or online follow-ups to continuously monitor product performance and promptly respond to customer feedback. Through proactive services, we ensure that equipment always operates at its optimal state, enhancing customer satisfaction.
By integrating rapid response, advanced technical support, and localized service experience, we have built a mature and efficient international service system. We are committed to providing professional and reliable after-sales support for global customers. We look forward to establishing long-term partnerships with you through continuous value delivery and high-quality services.
FAQs
When purchasing an oil-immersed transformer, you may want to know the following questions & answers.
Pre-Sales FAQs
Q: What types of transformers do you supply?
A: We supply various transformers including Power Transformers, Distribution Transformers, Step-up/Step-down Transformers, Isolation Transformers, Auto-transformers, and Specialty Transformers (for applications like mining, marine, solar, etc.).
Q: Can you provide transformers according to my specific requirements?
A: Absolutely. We specialize in providing tailored solutions. You can specify parameters like power rating (kVA/MVA), input/output voltage, frequency (50Hz/60Hz), vector group, insulation class, cooling method, and standards (IEC, ANSI, IEEE, etc.). Our technical team will review and confirm the feasibility.
Q: What international standards do your transformers comply with?
A: Our transformers primarily comply with IEC standards. We can also provide products meeting ANSI/IEEE, CSA, EN, and other regional standards upon request. Please specify your required certification during inquiry.
Q: What are the common voltage and frequency ratings available?
A: We supply transformers for common global standards (e.g., 11kV, 33kV, 110kV, 220kV) and frequencies (50Hz or 60Hz). Custom combinations for specific markets are also available.
Q: How do I request a quote?
A: Please use our "Contact Us" form or email us directly with your detailed specifications, quantity, and destination port. The more details you provide, the more accurate our quotation will be.
Q: What are your payment terms?
A: Standard terms include T/T (Bank Transfer), 30% deposit with 70% before shipment. Other terms can be negotiated based on order value and relationship.
Q: Do you handle shipping and export documentation?
A: Yes, we are experienced in international trade. We can arrange FOB Shanghai, CIF, or other Incoterms as per your preference. We handle all export documentation including commercial invoice, packing list, bill of lading, certificate of origin, and test reports.
Q: What is your quality control process?
A: We work with certified manufacturers. Our quality control includes factory audits, material inspection, in-process monitoring, and final routine testing. Third-party inspection (SGS, BV, etc.) is welcome and can be arranged.
Q: Do you provide factory test reports?
A: Yes, standard routine test reports (as per IEC 60076) are provided with each shipment. Type tests and special tests can be arranged at the factory with prior notice.
Post-Sales FAQs
Q: What is your warranty policy?
A: We typically offer a standard warranty of 12 months from the date of commissioning or 18 months from the date of shipment, whichever comes first. The warranty covers manufacturing defects under normal operation as per agreed specifications.
Q: What should I do if I receive a damaged product or find a defect?
A: Contact our after-sales team immediately atdemikstransformer@gmail.com. Please provide your order number, photos, and a detailed description of the issue. We will guide you through the claim process and work swiftly to find a solution.
Q: What documents will I receive with the shipment?
A: You will receive a complete set of documents including user manual, wiring diagrams, test reports, certificates (of origin, compliance), and packing list.
Q: Can you provide on-site installation guidance or commissioning support?
A: While we provide detailed installation manuals, we can arrange remote guidance via video call. For complex projects, we can coordinate with the factory to provide on-site technician support at an additional cost.
Q: Do you provide maintenance advice for the transformers?
A: Yes, we provide basic operation and maintenance manuals. Key advice includes regular checks for oil level (for oil-immersed), temperature, unusual noise, and cleanliness. We recommend following local electrical safety regulations.
Q: Can I order spare parts from you?
A: Yes, we supply genuine spare parts like bushings, gauges, tap changers, gaskets, and sometimes cooling fans. Please provide your transformer model and serial number for accurate identification.
Q: Who should I contact for after-sales inquiries?
A: For any technical or service issues, please email our dedicated after-sales team at [Insert Email, e.g., demikstransformer@gmail.com or call +86 13916614261. Please have your order reference ready.
Q: What if I need a repair service not covered under warranty?
A: We offer full repair and refurbishment support. Contact us with the details, and we will provide a diagnostic and a competitive quotation for the repair service.
