630kva three phase Oil immersed transformer/QIANLAI ELECTRIC
630kva oil fulled transformer overview
Our 630 kVA Oil Immersed Transformer is a three-phase distribution transformer designed for stable voltage conversion in medium to large-scale electrical systems. Adopting advanced oil-immersed cooling technology, it boasts exceptional heat dissipation, insulation performance, and overload capacity, making it the preferred choice for harsh and demanding operating environments. Compliant with IEC 60076, IEEE, ANSI, and GB standards, this transformer is certified with UL, CE, and ISO 9001:2015, ensuring seamless integration into global power networks.
S11 series 10KV double winding transformer main technical Parameter
| model | Rated capacity | Vector group | voltage | No load loss | Load Loss(W) | No load current(%) | Short circuit impedance(%) | ||
| HV | Tapping range | LV | |||||||
| S11-M-30 | 30 | Yyn0 or Dyn11 | 6 6.3 10 10.5 11 | ±2*2.5% or ± 5% | 0.4 | 100 | 630/600 | 1.5 | 4.0 |
| S11-M-50 | 50 | 130 | 910/870 | 1.3 | 4.0 | ||||
| S11-M-63 | 63 | 150 | 1090/1040 | 1.2 | 4.0 | ||||
| S11-M-80 | 80 | 180 | 1310/1250 | 1.2 | 4.0 | ||||
| S11-M-100 | 100 | 200 | 1580/1500 | 1.1 | 4.0 | ||||
| S11-M-125 | 125 | 240 | 1890/1800 | 1.1 | 4.0 | ||||
| S11-M-160 | 160 | 280 | 2310/2200 | 1.0 | 4.0 | ||||
| S11-M-200 | 200 | 340 | 2730/2600 | 1.0 | 4.0 | ||||
| S11-M-250 | 250 | 400 | 3200/3050 | 0.9 | 4.0 | ||||
| S11-M-315 | 315 | 480 | 3830/3650 | 0.9 | 4.0 | ||||
| S11-M-400 | 400 | 570 | 4520/4300 | 0.8 | 4.0 | ||||
| S11-M-500 | 500 | 680 | 5410/5100 | 0.8 | 4.0 | ||||
| S11-M-630 | 630 | 810 | 6200 | 0.6 | 4.5 | ||||
| S11-M-800 | 800 | 980 | 7500 | 0.6 | 4.5 | ||||
| S11-M-1000 | 1000 | 1150 | 10300 | 0.6 | 4.5 | ||||
| S11-M-1250 | 1250 | 1360 | 12000 | 0.5 | 4.5 | ||||
| S11-M-1600 | 1600 | 1640 | 14500 | 0.5 | 4.5 | ||||
| S11-M-2000 | 2000 | 1940 | 18300 | 0.4 | 5.0 | ||||
| S11-M-2500 | 2500 | 2290 | 21200 | 0.4 | 5.0 | ||||
630kva dry typetransformer VS 630kva oil immersed transformer
In power distribution systems, dry-type transformers and oil-immersed transformers are the two most common types. However, many people tend to confuse them or are unsure about which type to choose for specific scenarios during actual project selection. Today, we will break down the differences between the two from three dimensions: product differences, advantage comparisons, and application scenarios.
01 | Core Differences Between 630kva Dry Type and Oil Immersed Transformer
The visual differences between dry-type transformers and oil-immersed transformers are quite distinct.For 630kva dry-type transformers, the outer coils are usually cast with epoxy resin. The striking red epoxy resin material is highly recognizable, making it easy to identify.
As for 630kva oil-immersed transformers, they feature a fully sealed metal casing from an external perspective. Insulating oil is filled inside the tank, and the vertical grid-like structures distributed around the tank are the transformer’s radiators, designed for heat dissipation.
Structural Differences
The iron core and coil windings of dry-type transformers are directly visible. By contrast, the iron core and windings of oil-immersed transformers are completely submerged in a sealed oil tank.
Insulation Medium Differences
Dry-type transformers rely on solid materials such as epoxy resin and insulating paper for insulation. Oil-immersed transformers achieve insulation and heat dissipation primarily through the flow of insulating oil inside the tank.
Heat Dissipation Method Differences
Dry-type transformers adopt two cooling modes: natural air cooling and forced air cooling. When the transformer temperature reaches the preset threshold, the fans installed at the bottom of the unit will activate to dissipate heat.The heat dissipation of oil-immersed transformers mainly depends on the natural circulation of internal oil, which transfers heat to the radiators on the tank shell for dissipation into the air.
Size Differences
For transformers of the same capacity rating, oil-immersed transformers are generally larger in volume than dry-type transformers.
Voltage Rating Differences
The voltage rating of dry-type transformers is generally 35kV and below, while oil-immersed transformers can cover all voltage classes.
Capacity Differences
The capacity of dry-type transformers is generally limited to 3150kVA and below, whereas there is no upper limit to the capacity of oil-immersed transformers.
Overload Capacity Differences
Oil-immersed transformers have a stronger overload capacity compared with dry-type transformers.
02 | Advantage Comparison Between 630kva Dry-Type and 630kva Oil-Immersed Transformers
Relatively speaking, the manufacturing process of dry-type transformers is more sophisticated. It requires epoxy resin casting with vacuum casting equipment, followed by multiple processing procedures such as curing and demolding, leading to a higher comprehensive production cost.
In terms of product characteristics, the advantages of dry-type transformers are as follows:
Fire and explosion proof with high safety performance
Environmentally friendly materials with zero pollution
Maintenance-free operation, saving long-term costs
Oil-immersed transformers also have their unique advantages:
No restrictions on voltage and capacity
Strong overload capacity, supporting high-load operation
Sealed structure with moisture and dust resistance, impervious to rain and snow, and excellent environmental adaptability
