2025-08-23
Dayuan Power has compiled comprehensive information on three-phase transformer models, specifications, parameters, and prices. If you require transformers, please contact us with specific parameters for a quotation. We are one of the top ten renowned manufacturers in Jiangsu, China.
Threephase transformer models typically consist of letters and numbers following national standards (e.g., JB/T 3837), indicating key information such as phase number, cooling method, winding material, design sequence, rated capacity, and voltage level.
1. Model Naming Rules (Taking SCB111000/10 as an Example)
S: First letter, indicates phase number.
D Singlephase
S Threephase
C: Second letter, indicates cooling method.
G Drytype (aircooled)
C Resincast solid (a type of drytype transformer)
Oilimmersed transformers usually omit this letter.
B: Third letter, indicates winding material/characteristics.
B Foil winding (lowvoltage winding made of copper or aluminum foil)
L Aluminum winding (for oilimmersed transformers, L indicates aluminum winding; no L indicates copper winding)
R Wound core (commonly used in amorphous alloy transformers)
Z Onload tap changer
11: Design sequence or performance level code.
Numbers like 9, 10, 11, 13, 15, etc. Higher numbers indicate newer technology, lower noload and load losses, and higher energy efficiency. 11 corresponds to Grade II energy efficiency (current mainstream), 13 corresponds to Grade I (most efficient).
1000: Rated capacity, in kVA.
Common specifications: 30, 50, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500 kVA, etc.
10: Highvoltage side rated voltage, in kV.
Common specifications: 10kV, 6.3kV, 35kV, etc.
2. Common Model Series
| Model Prefix | Transformer Type | Key Features and Applications |
|---|---|---|
| S9, S11, S13, S18 | Oil-Immersed Transformers | S9 is obsolete. S11 meets Grade III efficiency (still in use), S13 meets Grade II/I efficiency. Large capacity range, low cost, commonly used outdoors, in substations, and industrial plants. |
| SCB10, SCB11, SCB12, SCB13, SCB14, SCB15 | Epoxy Resin-Cast Dry-Type Transformers | Fireproof, explosion-proof, pollution-free, low loss, low noise. SCB11/12/13 are currently mainstream. Ideal for indoor use, high-rise buildings, airports, stations, hospitals, data centers, and other high-demand applications. |
| SGB10, SGB11 | Non-Encapsulated (Impregnated) Dry-Type Transformers | Windings treated with insulating varnish, good heat dissipation, strong overload capacity, lower cost than cast resin transformers. |
| SH15, SCRBH15 | Amorphous Alloy Transformers | Core made of amorphous alloy material, extremely low no-load loss (60-70% lower than S13). Suitable for applications with low load rates and long-term light loads, such as rural power grids and commercial areas with high nighttime electricity consumption. |
3. Key Parameters
In addition to the model, the following parameters are critical when selecting a transformer:
1. Rated Capacity (kVA): The maximum apparent power output under rated conditions. Consider the total load power and future expansion needs, typically with a 15%20% margin.
2. Rated Voltage (kV/V): Primary (input) and secondary (output) voltages. Common: 10kV/0.4kV (10kV input, 400V output).
3. Impedance Voltage (%): Also known as shortcircuit impedance. A higher value reduces shortcircuit current and grid impact but increases voltage fluctuation. Typically 4%6%, higher for larger capacities.
4. Connection Group Symbol: Indicates the connection method and phase relationship of windings. Dyn11 is the most common:
D Delta connection on highvoltage side
y Star connection on lowvoltage side
n Neutral point引出 (zero line)
11 Lowvoltage line voltage lags highvoltage line voltage by 330° (11 o’clock direction).
Advantages: Suppresses harmonics, provides stable neutral point, preferred for modern power distribution systems.
5. NoLoad Loss (kW) & Load Loss (kW):
NoLoad Loss: Often called "iron loss," fixed loss generated in the core when energized.
Load Loss: Often called "copper loss," proportional to the square of the load current.
Energy Efficiency Grade: Grade I (most efficient) > Grade II > Grade III (obsolete). New purchases must meet at least Grade II energy efficiency standards (GB 200522020).
6. Dimensions and Weight: Critical for transportation and installation planning.
Important Note: Transformer prices fluctuate significantly due to various factors. The following are approximate market ranges (in USD). Contact manufacturers for exact quotes.
Key Factors Affecting Price:
1. Capacity: Higher capacity, higher price.
2. Type: Drytype > oilimmersed (same capacity). Amorphous alloy > standard silicon steel transformers.
3. Energy Efficiency: Grade I (e.g., SCB14/SCB18/S20) > Grade II (e.g., SCB13/S18) > Grade III (e.g., SCB11/S13). Higher efficiency requires better materials (e.g., thinner highpermeability silicon steel, oxygenfree copper wires), increasing costs.
4. Raw Material Prices: Copper and silicon steel prices are major cost drivers.
5. Brand: Wellknown brands (e.g., TBEA, XD, Sunten, Jinpan) may have a premium over local manufacturers.
6. Special Requirements: Onload tap changers, protection(IP rating), custom enclosures, lownoise requirements, etc., add costs.
| Capacity (kVA) | Oil-Immersed (S13, Grade II) | Epoxy Resin Dry-Type (SCB13, Grade II) | Amorphous Alloy (SH15) |
|---|---|---|---|
| 100 | $3,500 - $5,600 | $6,300 - $9,100 | $8,400 - $11,200 |
| 315 | $7,000 - $9,800 | $12,600 - $16,800 | $18,200 - $22,400 |
| 500 | $9,800 - $12,600 | $18,200 - $22,400 | $25,200 - $30,800 |
| 800 | $12,600 - $16,800 | $25,200 - $32,200 | $36,400 - $44,800 |
| 1000 | $15,400 - $19,600 | $29,400 - $37,800 | $42,000 - $53,200 |
| 1250 | $18,200 - $22,400 | $35,000 - $44,800 | $50,400 - $63,000 |
| 1600 | $22,400 - $28,000 | $44,800 - $56,000 | - |
Note:
Prices are for the equipment only, excluding transportation, installation,调试, infrastructure, highvoltage cables, and accessories.
Confirm whether prices include tax (13% VAT invoice).
Final prices depend on technical parameters, order quantity, and payment terms.
Summary and Purchasing Advice
1. Define Requirements: Determine the application (indoor/outdoor), required capacity, voltage level, and energy efficiency needs.
2. Choose Type:
Indoor, high safety requirements (e.g., buildings, data centers) → Drytype transformers (SCB13/SCB14).
Outdoor, costsensitive, large capacity → Oilimmersed transformers (S13/S20).
Longterm light load, sensitive to noload loss (e.g., rural grids) → Consider amorphous alloy transformers (SH15).
3. Verify Parameters: Focus on performance level codes (11, 13, 14, etc.), rated capacity, connection group (Dyn11), impedance voltage, and loss values.
4. Request Multiple Quotes: Obtain formal quotes and technical solutions from at least 23 reputable manufacturers for comparison.
