Dry-type transformers · SC(B)10 / SC(B)11
20 kV and 35 kV SC(B)10 / SC(B)11 Dry-Type Transformer
The 20 kV and 35 kV SC(B)10 and SC(B)11 series are low-loss dry-type transformers built to Chinese national standards, used to step 35 kV or 20 kV grid supply directly down to a 400 V distribution supply or a 10 kV transmission supply.
Product overview
Low-loss dry-type transformer stepping 35 kV or 20 kV grid supply directly down to 400 V distribution or 10 kV transmission.
- Model
- SC(B)10 / SC(B)11
- Product family
- Dry-type transformers
Overview
- Less land use and fewer multi-stage substation works.
- Lower project investment and better economic return.
- One less 10 kV transformation stage, reducing operation and maintenance costs.
- High-voltage low-current transmission instead of low-voltage high-current, reducing line losses and line operating costs.
- 35 kV and 20 kV supply reaches the load centre directly, improving supply reliability.
Electrical and insulation performance
- Insulation design: the coils are cast in epoxy resin under vacuum and cure into a rigid cylindrical body, improving withstand against atmospheric and switching overvoltages, further lowering partial discharge and keeping the insulation level stable throughout the service life.
- Impulse and short-circuit withstand: HV and LV windings are made of oxygen-free copper and supported by high-toughness ceramic parts, giving low short-circuit resistance, high mechanical strength and a high short-circuit and lightning-impulse withstand level.
- Overload capability: the insulation class is normally H (180℃) or F; without forced-air cooling the unit can carry a continuous overload of 120%.
Safety, environment and efficiency
- Flame-retardant and non-toxic: self-extinguishing materials release no toxic or harmful gases in a fire or an arc and produce almost no smoke at high temperature, so the unit is fire- and explosion-safe.
- Moisture and pollution resistance: the coils do not absorb moisture and run stably in harsh environments without any drying treatment.
- Low loss and low noise: the core uses high-grade cold-rolled silicon steel in a stepped mitred configuration, lowering no-load loss, no-load current and operating noise.
- Cooling and overload: the thin resin layer dissipates heat well and low-noise fans can be fitted for forced-air cooling.
Key features
- Steps 35 kV or 20 kV directly down to 400 V or 10 kV
- Vacuum-cast epoxy resin, low partial discharge
- Oxygen-free copper windings with high-toughness ceramic supports
- Class H (180℃) or class F insulation
- 120% continuous overload without forced-air cooling
- Self-extinguishing, almost no smoke at high temperature
- Stepped mitred cold-rolled silicon steel core, low noise
- Optional low-noise fans for forced-air cooling
Key facts
- Rated capacity
- 50–20000 kVA
- Voltage class
- 20 kV, 35 kV / 0.4 kV (power type 3.15–11 kV)
- Cooling & insulation
- AN/AF · class H (180℃) or class F
- Standard
- GB 1094.11
Technical parameters
| Rated capacity (kVA) | No-load current (%) | No-load loss (W) | Load loss at 120℃ (W) | Short-circuit impedance (%) |
|---|---|---|---|---|
| 50 | 1.2 | 300 | 1230 | 6.0 |
| 100 | 1.1 | 470 | 1980 | 6.0 |
| 160 | 1.0 | 580 | 2460 | 6.0 |
| 200 | 0.8 | 640 | 2930 | 6.0 |
| 250 | 0.8 | 720 | 3400 | 6.0 |
| 315 | 0.7 | 840 | 4060 | 6.0 |
| 400 | 0.6 | 1000 | 4820 | 6.0 |
| 500 | 0.6 | 1170 | 5760 | 6.0 |
| 630 | 0.5 | 1320 | 6800 | 6.0 |
| 800 | 0.5 | 1520 | 8220 | 6.0 |
| 1000 | 0.5 | 1790 | 9730 | 6.0 |
| 1250 | 0.5 | 2060 | 11480 | 6.0 |
| 1600 | 0.5 | 2410 | 13790 | 6.0 |
| 2000 | 0.5 | 2800 | 16290 | 6.0 |
| 2500 | 0.4 | 3340 | 19270 | 6.0 |
Note: Load losses are given at the reference temperature in brackets (see GB 1094.11). Rating tables for the 20 kV SC(B)10 and 35 kV SC(B)10 series are available on request.
Typical installations
- 20 kV and 35 kV distribution networks
- Industrial load centres
- Industrial and mining plants
- Projects replacing multi-stage transformation
Related products
Other products in this family
SCBH19
Rated capacity:
30–2500 kVA
Voltage class:
10 kV / 0.4 kV
SCBH19 Amorphous-Alloy Dry-Type Transformer
Amorphous-alloy dry-type transformer meeting the Chinese Grade 1 efficiency standard, with vacuum-cast epoxy insulation and 15%–30% lower no-load loss.
SCBH17
Rated capacity:
100–2500 kVA
Voltage class:
10 kV / 0.4 kV
SCBH17 Amorphous-Alloy Dry-Type Transformer
Grade 2 efficiency dry-type transformer: 15% lower no-load loss, 10% lower load loss and about 20% lower no-load current than SCBH15.
SCBH15 / SGBH15
Rated capacity:
30–2500 kVA
Voltage class:
6–10 kV / 0.4 kV
SCBH15 / SGBH15 Amorphous-Alloy Dry-Type Transformer
Amorphous-alloy core with three-phase five-limb structure: no-load loss 75% below conventional dry-type units, installable inside load centres.
SC(B)11–SC(B)18
Rated capacity:
30–2500 kVA
Voltage class:
10 kV / 0.4 kV
10 kV SC(B)11–SC(B)18 Epoxy Cast-Resin Dry-Type Transformer
10 kV epoxy cast-resin dry-type transformer with low noise, low loss and low partial discharge — a replacement for oil-immersed distribution transformers.
Solutions and quotations
Tell us what your project needs
Send the capacity, voltage class and installation conditions, and we will come back with a selection proposal, technical data and a quotation.
- Amorphous alloy transformers
- Custom configuration
- Type-test reports
- After-sales support