Dry-type transformers are widely used in areas such as local lighting, high-rise buildings, airports, docks, CNC mechanical equipment, etc. Simply put, a dry-type transformer refers to a transformer whose core and windings are not immersed in insulating oil.
The cooling methods are divided into natural air cooling (AN) and forced air cooling (AF). During natural air cooling, the transformer can operate continuously at the rated capacity for a long time. When using forced air cooling, the output capacity of the transformer can be increased by 50%. This method is suitable for intermittent overload operation or emergency accident overload operation; however, due to the significant increase in load loss and impedance voltage during overload, it is in an uneconomical operating state, so it should not be allowed to operate in a long-term continuous overload state.
Application scenario
Emergency power supply: Works in conjunction with UPS (uninterruptible power supply) or diesel generators to ensure that critical facilities (such as the command center, security inspection system) continue to operate in the event of a power outage.
Office buildings / Shopping centers
Power distribution for lighting, elevators, central air conditioning, security systems, etc.
High-demand areas (such as banquet halls, kitchens) require stable power supply. The dry-type transformer should have strong anti-short-circuit capability and be suitable for dense power distribution.
Power supply for mechanical equipment: Suitable for the power distribution of large equipment such as cranes and conveying machinery at the dock.
Integration of automation systems: Cooperates with the automation control system to achieve precise power control.
Special environment areas: Including areas in high-rise buildings, airports, docks, etc. that require local lighting.
Power equipment support: For instance, local lighting in the high-voltage integrated distribution cabinets of substations is usually powered by 380V low-voltage power supply.
Main Performance Parameters
(30~2500kVA energy efficiency class I dry-type power
| Model Number |
Rated Capacit y(KVA) |
Voltage Combination | Conneci on Group Label |
No-load Loss (W) |
Load Loss (W) |
No-load Electricit y (%) |
Short Circuit Impedan ce (%) |
||
| High Voltag e |
High Voltage |
High Voltag e |
|||||||
| SC18-30-N×1 | 30 | 6 6.3 10 10.5 |
+3 -1 ±5% ±2×2.5% 或 ×2.5% |
0.4 | Dyn11 或 Yyn0 |
105 | 640 | 2.0 | 4 |
| SC18-50-N×1 | 50 | 155 | 900 | 2.0 | 4 | ||||
| SC18-80-N×1 | 80 | 210 | 1240 | 1.5 | 4 | ||||
| SC18-100-N×1 | 100 | 230 | 1415 | 1.5 | 4 | ||||
| SC18-125-N×1 | 125 | 270 | 1665 | 1.3 | 4 | ||||
| SC18-160-N×1 | 160 | 310 | 1915 | 1.3 | 4 | ||||
| SC18-200-N×1 | 200 | 360 | 2275 | 1.1 | 4 | ||||
| SC18-250-N×1 | 250 | 415 | 2485 | 1.1 | 4 | ||||
| SCB18-315-N×1 | 315 | 510 | 3125 | 1:0 | 4 | ||||
| SCB18-400-N×1 | 400 | 570 | 3590 | 1.0 | 4 | ||||
| SCB18-500-N×1 | 500 | 670 | 4390 | 1.0 | 4 | ||||
| SCB18-630-N×1 | 630 | 775 | 5290 | 1.0 | 4 | ||||
| SCB18-630-N×1 | 630 | 750 | 5365 | 0.85 | 6 | ||||
| SCB18-800-Nx1 | 800 | 875 | 6265 | 0.85 | 6 | ||||
| SCB18-1000-Nx1 | 1000 | 1020 | 7315 | 0.85 | 6 | ||||
| SCB18-1250 | 1250 | 1205 | 8720 | 0.85 | 6 | ||||
| N×1 | |||||||||
| SCB18-1600-N×1 | 1600 | 1415 | 10555 | 0.85 | 6 | ||||
| SCB18-2000 Nx1 |
2000 | 1760 | 13005 | 0.7 | 6 | ||||
| SCB18-2500-Nx | 2500 | 2080 | 15445 | 0.7 | 6 | ||||
Characteristic
● Compared with SCB10 products, the no-load loss is reduced by more than 20%, offering excellent energy-saving effects, economical operation, and maintenance-free performance.
● The noise level has been significantly reduced, with a decrease of more than 10 to 15 decibels.
● High mechanical strength and strong short-circuit resistance: Flame retardant, explosion-proof, and pollution-free.
● Maintenance-free; excellent moisture resistance, capable of operating under 100% humidity. No preheating is required before commissioning, and no dehumidification is needed during intermittent operation.
● Compact size, lightweight, no cracking, no surface Moire, and low partial discharge.
● High insulation level and excellent resistance to lightning and electrical shocks.
● Strong heat dissipation capability, able to operate with rated load under forced air-cooling conditions.
Working Conditions
● Maximum ambient temperature: +40℃;
● Minimum ambient temperature: -5℃;
● Altitude: <1000m;
● Maximum monthly average relative humidity: 90% (at 20℃);
● Installation location: No obvious pollution, for indoor use only.
Dry-type transformer production method
Production process
Coil winding
The coil is a key component of a dry-type transformer. It is usually wound using copper or aluminum wires and the appropriate winding structure (such as wire-wound cast type, foil-wound cast type, etc.) needs to be selected based on the voltage level and capacity. High-voltage windings often adopt a segmented cylindrical structure to enhance shock resistance, while low-voltage windings are designed as multi-layer cylindrical or special segmented cylindrical structures according to the capacity.
Core manufacturing
The core is made by stacking silicon steel sheets and needs to be precisely cut into the specified shape and assembled into core columns. The core structures of different types of dry-type transformers vary greatly. For example, the core of a wire-wound cast type transformer needs to be designed in conjunction with the winding winding method.
Insulation treatment
Dip type: The conductors are covered with glass fibers, and the pads are formed by hot pressing with insulating materials. It is suitable for places such as hydropower stations and high-rise buildings, but it has a large volume and the production volume is gradually decreasing.
Resin casting type: It is cast using epoxy resin or special materials, featuring high fire resistance and light weight. It is the mainstream process in China at present.
Assembly and testing
The core and coil are fixedly assembled with insulating materials. After completion, they need to undergo tests such as insulation resistance and power frequency withstand voltage to verify the performance. Before transportation, they need to be strictly packaged to prevent damage during transportation.
FAQ
Q: Q: What are the differences between dry-type transformers and oil-immersed transformers?
A: A:Dry-type transformer cooling methods: air/epoxy resin cooling, fire-resistant performance, no fire risk. Suitable for indoor use, low maintenance cost, high price. Applicable scenarios: hospitals, data centers, commercial buildings.
Oil-immersed transformer cooling method: Oil cooling, fire prevention performance requires fire protection measures, maintenance cost requires regular inspection of oil level and oil quality. Low price. Applicable scenarios: Substations, industrial buildings.
Q: What are the differences between models such as SCB10 and SCB13?
A:SCB10: Ordinary loss (old national standard) SCB11/12/13: Low loss (new national standard, 13 is about 15% more energy-efficient than 10)SCB14/15: Ultra-low loss (complies with the latest energy efficiency standards)
Q:What are the differences between the protection levels IP20 and IP23?
A:IP20: Dust-proof only, suitable for dry indoor environments (such as power distribution rooms).
IP23: Dust-proof + Splash-proof, suitable for humid or mild outdoor environments.
Q：Does the dry-type transformer produce a lot of noise when in operation? How can the noise be reduced? For dry-type transformers ranging from 30kVA to 1000kVA: approximately 50 to 65 decibels (similar to the volume of normal conversation)
A：Noise reduction solution:
Choose a model with low noise design (such as SCB13-R, with sound insulation cotton)
Install shock-absorbing base (to reduce sound transmission through the structure)
Place the installation away from sensitive areas (such as offices) or install a soundproof cover
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