Power Transformer
The classification of commonly used transformers can be summarized as follows:
1, according to the number of phases:
1) Single-phase transformer: used for single-phase load and three-phase transformer group.
2) Three-phase transformer: used for the rise and fall of three-phase systems.
2, according to the cooling method:
1) Dry transformers: rely on air convection for natural cooling or increase fan cooling, mostly used in high-rise buildings, high-speed toll stations and electricity and local lighting, electronic lines and other small capacity transformers.
2) Oil-immersed transformer: relying on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation,
Introduction to the Production Process of Dry-Type Transformers
The manufacturing process of dry-type transformers primarily revolves around "oil-free, insulation, and design," with core steps including:
1. Coil Winding
Low-voltage coils
Typically made of copper foil or layer-wound copper wire to enhance conductivity and mechanical strength.
High-voltage coils
Mostly wound with copper wire, adopting segmented or continuous structures to ensure insulation and heat dissipation performance.
Insulation materials
Polyester films, Nomex paper, or epoxy prepreg materials are used for interlayer insulation.
2. Insulation Treatment
Impregnation process
Coils are impregnated with epoxy or silicone resin to improve moisture resistance and heat resistance (applicable to impregnated dry-type transformers).
Vacuum casting
Coils in molds are vacuumed and filled with epoxy resin, which cures to form an integrated insulation layer (a standard process for cast-resin dry-type transformers).
3. Core Assembly
High-permeability silicon steel sheets are laminated with mitered joints to minimize magnetic reluctance and no-load loss, and the core is insulated with paint to prevent rust and eddy current losses.
4. Curing and Molding
Cast-resin transformers require curing in high-temperature ovens to ensure bubble-free and uniform resin solidification.
Impregnated types undergo multiple impregnation and drying cycles to enhance insulation strength.
5. Testing and Quality Inspection
Routine tests
Include turns ratio testing, DC resistance measurement, and power-frequency withstand voltage tests (e.g., 35kV class must withstand 70kV).
Type tests
Partial discharge testing (typically required ≤10pC), temperature rise tests (coil temperature rise not exceeding 100K), and short-circuit withstand capability tests.
6. Surface Treatment and Protection
Weather-resistant coatings are applied (e.g., IP20 for indoor use, IP23 for drip protection).
Protective enclosures or fans are installed (for forced-air-cooled models).
| Upto 11 KV /0.433 or 0.415 |
Energy Level 1 |
| Rating (KVA) |
Total Losses @50% Load |
Total Losses @ |
Z% |
| Watts |
Watts |
Impedance |
| 250 |
980 |
2930 |
4.50% |
| 315 |
1025 |
3100 |
4.50% |
| 400 |
1225 |
3450 |
4.50% |
| 500 |
1510 |
4300 |
4.50% |
| 630 |
1860 |
5300 |
4.50% |
| 800 |
2287 |
6402 |
5.00% |
| 1000 |
2790 |
7700 |
5.00% |
| 1250 |
3300 |
9200 |
5.00% |
| 1600 |
4200 |
11800 |
6.25% |
| 2000 |
5050 |
15000 |
6.25% |
| 2500 |
6150 |
18500 |
6.25% |
Shandong Weichite Electric Power Technology Co., Ltd. is a power equipment manufacturer from Jining, Shandong, the "hometown of Confucius" in China. The company's products cover many fields of power equipment, under the establishment of several branches, the main series of products are, electric pole series, iron tower series, power fittings series, insulation material series, overhead wire and cable series, fastener bolt series, transformer, arrester, and other power equipment, The company has more than 100 kinds of power equipment products, professional technical research and development team and perfect quality management system, and has first-class product supporting experience. With many years of power engineering construction services and equipment supporting supply services in China's National grid system, we have accumulated a large number of real cases, specializing in the production of supporting products for 0.4KV to 500KV overhead lines. We focus on solving all kinds of overhead power line construction technical consulting and complete power equipment supporting. According to customer needs to provide the best design and the best product support. Our corporate mission is to provide the world's power engineering companies with the most complete supply of power equipment materials and provide professional technical advice and guidance, truly centralized procurement. Save you a lot of time and cost. Welcome to your arrival!
Exhibition & Our Partners
Q1:What is your Minimum Order Quantity (MOQ)?
A:Our standard MOQ is 100units/sets, and we accept trial orders. Custom MOQ can be negotiated based on product requirements.
Q2:Do you offer customization (e.g., logo, packaging)?
A:Yes! We provide OEM/ODM services for product specifications, packaging, and logo printing. Please share your design files (e.g., AI/CDR), and we will propose solutions promptly.
Q3:How to order samples? Who pays for shipping?
A:Samples can be ordered online with freight collect (DHL/UPS/FedEx) or prepaid. Sample cost is 50% of bulk order price, refundable upon confirmation.
Q4:What is the lead time?
A:Standard lead time: 15 days (after deposit). Customized products require +10 days for sampling. Early orders recommended during peak seasons.
Q5:What payment methods do you accept?
A:We accept T/T, L/C, Trade Assurance, etc., ensuring secure transactions.
Q6: How do you ensure product quality
A:100% inspection: All products pass QA checks before shipment (reports available).
Certified: Compliant with CE/FCC/ROHS standards (certificates shown below).
Warranty: 24-month warranty with free replacement for defects.
Q7:Which ports and logistics partners do you use?
A: Main ports: Shenzhen/Shanghai/Ningbo (other ports available).
Logistics partners: DHL, sea freight agents (MSC/Maersk), express lines, etc., to balance cost and efficiency.
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