Dry-type Transformer
On-Load Tap-Changing Dry-Type Transformer SCZ11 Series 2000~25000kVA (10~35kV Regulating Under Load)
On-Load Tap-Changing Dry-Type Transformer SCZ11 Series (2000~25000kVA)
Product Overview
The on-load tap-changing (OLTC) dry-type transformer integrates a vacuum on-load tap changer on the epoxy-resin cast insulation platform, achieving stepless voltage regulation under load. Rated voltage 10kV~35kV, capacity 800kVA~25MVA, with a wide regulation range and short response time. It suits applications with strict voltage-stability requirements such as grid reactive-power compensation nodes, PV/wind grid-connection points and precision manufacturing.
An OLTC dry-type transformer adjusts its voltage while under load — ideal wherever frequent voltage adjustment is needed to keep the supply stable. It is widely used across power systems and industry, mainly in urban grids, factories, offshore platforms and substations.
Model Designation
| S | C | Z | □ | □ / □ |
|---|---|---|---|---|
| Three-phase | Epoxy-resin cast | On-load tap changing | Performance code | Rated kVA / Voltage class kV |
Key Features
- Regulation under load: equipped with an on-load tap changer — short response time, fast and convenient;
- Reliable insulation: well-arranged main and longitudinal insulation design with excellent insulation performance;
- Precision cooling: lowers winding temperature rise and extends product life;
- Integrated delivery: transformer and OLTC designed as one unit — simple installation and shorter construction schedule.
Main Performance Parameters — SCZ11 On-Load Tap-Changing Dry-Type Transformer
| Model | Rated Power (kVA) | Vector Group | Voltage Combination (kV) | No-load Loss (W) | Load Loss (W) 120℃ (F) | No-load Current (%) | Short-circuit Impedance (%) | ||
|---|---|---|---|---|---|---|---|---|---|
| HV | Tap Range | LV | |||||||
| SCZ11-2000 | 2000 | Dyn11 Yyn0 | 35 / 36 / 37 / 38.5 | ±4×2.5% | 6 / 6.3 / 10 / 10.5 / 11 | 4050 | 19000 | 0.65 | 7 |
| SCZ11-2500 | 2500 | 4690 | 22600 | 0.65 | |||||
| SCZ11-3150 | 3150 | 5670 | 25400 | 0.6 | |||||
| SCZ11-4000 | 4000 | 6640 | 30400 | 0.6 | 8 | ||||
| SCZ11-5000 | 5000 | 7850 | 36100 | 0.5 | |||||
| SCZ11-6300 | 6300 | 9270 | 41800 | 0.5 | |||||
| SCZ11-8000 | 8000 | 10600 | 47500 | 0.45 | 9 | ||||
| SCZ11-10000 | 10000 | 12100 | 57100 | 0.45 | |||||
| SCZ11-12500 | 12500 | 14700 | 66500 | 0.35 | |||||
| SCZ11-16000 | 16000 | 18100 | 78600 | 0.35 | |||||
| SCZ11-20000 | 20000 | 21400 | 83800 | 0.3 | 10 | ||||
| SCZ11-25000 | 25000 | 25200 | 104000 | 0.3 | |||||
Typical Applications
| Sector | Description |
|---|---|
| Urban Grids | Large day/night and seasonal load swings — regulation under load keeps end-user voltage within limits |
| PV / Wind Grid-Connection Points | Stabilizes grid-connection voltage against output fluctuations |
| Factories / Precision Manufacturing | Precision equipment demands stable voltage — regulation safeguards process quality |
| Offshore Platforms / Substations | Integrated delivery for space-limited sites — simple installation, shorter schedule |
Why Choose XD?
With years of transformer manufacturing and export experience, XD delivers products worldwide with complete type-test reports and international certifications. Regulation steps, step voltage and OLTC configuration can be customized to IEC/ANSI/GB standards and project conditions, with OEM/ODM service and full export documentation support. Send us your inquiry with your voltage-fluctuation profile — our engineers will propose the optimal solution.
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Contact Us
Contact: Tianjin Delda Trading Co., Ltd
WhatsApp: +86 13662056855
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E-mail: solomon20210701@tjxddq.com
Add: Unit‑101, Workshop 3, Bozhong Automobile Industrial Park, No.5 Xianghui Road, Intersection of Xianghui Road and Gaoying Road, Beizhakou Town, Jinnan District, Tianjin, China