PRODUCT
35kV SCB series (mainstream SCB13, SCB14, SCB18)
Detailed Technical Parameters of 35kV SCB Dry-Type Transformer
1. Basic Model & Specifications
– Model: SCB10/SCB11/SCB12/SCB14/SCB18 (Epoxy Resin Cast, Copper Winding, Foil Low-Voltage)
– Rated Capacity: 50kVA～25000kVA (Common: 50/100/160/200/250/315/400/500/630/800/1000/1250/1600/2000/2500/3150/4000/5000kVA)
– Rated Frequency: 50Hz (60Hz customizable)
– Phase: Three-Phase
– Installation: Indoor (IP20/IP40)
2. Rated Voltage & Taps
– High Voltage (HV): 35kV; Maximum Operating Voltage: 40.5kV – Low Voltage (LV): 0.4kV / 10kV (Common: 35/0.4kV)
– Tap Range: ±2×2.5% (Off-Circuit Tap Changer) – Connection Group: Dyn11 (Preferred), Yyn0, Yd11
3. Insulation & Thermal Class
– Insulation Class: Class F (155℃), Class H (180℃) – Insulation Level (35/0.4kV): LI170AC70/AC5
– Insulation Level (35/10kV): LI170AC70/LI75AC35 – Partial Discharge: ≤5pC (Standard)
– Pollution Class: Class III (d)
4. Cooling & Protection
– Cooling Method: AN (Self-Cooling) / AF (Forced-Air Cooling) – Protection Degree: IP20 (Standard), IP40 (Customizable)
– Temperature Rise Limit: Winding 100K (Class F); Core & Structural Parts 80K
5. Impedance & Losses (Class F, 120℃)
Key Parameters (Example: 35/0.4kV)
Rated Capacity (kVA) No-Load Loss (W) Load Loss (W) No-Load Current (%) Short-Circuit Impedance (%)
Note: Lower losses for SCB14/SCB18, customizable per energy efficiency level.
6. Mechanical & Dimensions
– Short-Circuit Impedance: 6%～8% (7%～8% for large capacity) – Short-Circuit Withstand Capability: Withstand 20kA (HV side) for 4s
– Noise Level: 50～65dB (AN); 55～70dB (AF) – Weight (kg): 1000kVA≈5500; 2000kVA≈8500; 4000kVA≈13000
– Overall Dimensions (mm, L×W×H):
– 1000kVA: 2000×1200×2000 – 2000kVA: 2300×1400×2200 – 4000kVA: 2600×1600×2500
7. Operating Conditions (Standard)
– Altitude: ≤1000m (Derating required if >1000m) – Ambient Temperature: -25℃～+40℃
Scope of application:
1. Power transmission and distribution link: 35kV substation, distribution voltage reduction of regional power grid, connecting 35kV high-voltage power grid and 10kV medium voltage power grid.
2. Large industrial scenarios: general step-down substations for heavy industrial enterprises such as steel, chemical, and metallurgical industries, as well as main distribution systems for large industrial parks.
3. New energy power stations: Boost/buck distribution of photovoltaic power stations and wind farms (adapted to the 35kV voltage level requirements of new energy grid connection).
4. Urban power grid engineering: 35kV distribution nodes in urban power grid renovation and new area power grid construction, responsible for regional backbone power supply tasks.
