Essential details
Quantity(pieces):1
Shipping:Sea freight
Package Description:wooden case
Product Introduction
I. General Overview of the Product
The 35kV SCB12, SCB14, and SCB18 series are three-phase epoxy resin cast dry-type power transformers. They feature a high-permeability grain-oriented silicon steel sheet core and F/H grade insulation vacuum cast windings. The core characteristics include oil-free fire prevention, anti-short circuit, low partial discharge, energy conservation, and maintenance-free. They are strictly designed and manufactured in accordance with standards such as GB 20052-2024 "Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers", GB/T 1094, and GB/T 22072. They are mainly used in terminal distribution scenarios where 35kV power is directly stepped down to 0.4kV. This eliminates the need for a 10kV intermediate transformer stage and is suitable for urban hub substations, large industrial facilities, data centers, high-rise buildings, subways, airports, and indoor important places with strict fire and environmental protection requirements.
Model Meaning: S = three-phase; C = epoxy resin casting; B = low-voltage foil-type windings; 12/14/18 = performance design sequence number (corresponding to energy efficiency grades).
Voltage Level: High voltage 35kV, low voltage 0.4kV (standard), customizable for multiple voltage levels 35/6/10kV.
Capacity Range: 500kVA to 25000kVA (mainstream 800kVA to 10000kVA).
Insulation and Cooling: Standard F grade (155℃), optional H grade (180℃); cooling methods AN (self-cooling) / AF (air-cooling).
Protection Grade: IP20 (standard), optional IP30, IP54 (dustproof and moistureproof).
Core Configuration: No excitation voltage regulation (±2×2.5%), equipped with intelligent temperature control, fan linkage, RS485 communication, and fault alarm functions.
The 35kV SCB12, SCB14, and SCB18 series are three-phase epoxy resin cast dry-type power transformers. They feature a high-permeability grain-oriented silicon steel sheet core and F/H grade insulation vacuum cast windings. The core characteristics include oil-free fire prevention, anti-short circuit, low partial discharge, energy conservation, and maintenance-free. They are strictly designed and manufactured in accordance with standards such as GB 20052-2024 "Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers", GB/T 1094, and GB/T 22072. They are mainly used in terminal distribution scenarios where 35kV power is directly stepped down to 0.4kV. This eliminates the need for a 10kV intermediate transformer stage and is suitable for urban hub substations, large industrial facilities, data centers, high-rise buildings, subways, airports, and indoor important places with strict fire and environmental protection requirements.
Model Meaning: S = three-phase; C = epoxy resin casting; B = low-voltage foil-type windings; 12/14/18 = performance design sequence number (corresponding to energy efficiency grades).
Voltage Level: High voltage 35kV, low voltage 0.4kV (standard), customizable for multiple voltage levels 35/6/10kV.
Capacity Range: 500kVA to 25000kVA (mainstream 800kVA to 10000kVA).
Insulation and Cooling: Standard F grade (155℃), optional H grade (180℃); cooling methods AN (self-cooling) / AF (air-cooling).
Protection Grade: IP20 (standard), optional IP30, IP54 (dustproof and moistureproof).
Core Configuration: No excitation voltage regulation (±2×2.5%), equipped with intelligent temperature control, fan linkage, RS485 communication, and fault alarm functions.
II. Series Core Comparison (GB 20052-2024)
SCB12 is a Class 3 energy efficiency model (NX3), serving as the basic benchmark model for 35kV dry-type transformers. It features mature and stable technology, low cost, and strong versatility. The no-load loss and load loss meet the minimum entry requirements of the national standard. The core uses conventional high-quality silicon steel sheets, has a compact structure and is easy to install. It is mainly used for existing facility renovations, replacement of old equipment, and general industrial and public buildings with limited budgets, suitable for scenarios with small load fluctuations and medium operating duration.
SCB12 is a Class 3 energy efficiency model (NX3), serving as the basic benchmark model for 35kV dry-type transformers. It features mature and stable technology, low cost, and strong versatility. The no-load loss and load loss meet the minimum entry requirements of the national standard. The core uses conventional high-quality silicon steel sheets, has a compact structure and is easy to install. It is mainly used for existing facility renovations, replacement of old equipment, and general industrial and public buildings with limited budgets, suitable for scenarios with small load fluctuations and medium operating duration.
SCB14 is a Class 2 energy efficiency model (NX2), belonging to the mainstream energy-saving models in the market. The no-load loss of SCB14 is reduced by approximately 15%, and the load loss is reduced by approximately 10%. It adopts high-magnetic-conductivity silicon steel sheets and optimized air duct design, resulting in a smaller volume, lower noise, and stronger heat dissipation. The comprehensive cost performance is outstanding, suitable for most scenarios such as new commercial complexes, hospitals, schools, medium-sized industries, and urban conventional substations. It is the mainstream choice for new projects.
SCB18 is a Class 1 energy efficiency model (NX1), representing the highest level of ultimate energy-saving for 35kV dry-type transformers. The no-load loss of SCB18 is reduced by 25% to 30% compared to SCB12, and the load loss is reduced by approximately 12%. It uses ultra-high magnetic-conductivity Hi-B silicon steel sheets, full inclined multi-level joints, and low-loss technology, with local discharge ≤ 5pC, noise ≤ 45dB, and the best short-circuit and impact resistance performance. The initial investment is relatively high, but it offers significant annual electricity savings, and the cost can be recovered within 3 to 5 years. It is specifically used for data centers, power grid hubs, super high-rise buildings, new energy power stations, areas with high electricity prices, and long-term full-load carbon-neutral key projects.
III. Key Technologies and Structural Features
1. Core: Utilizes high-quality cold-rolled grain-oriented silicon steel sheets, with 45° fully inclined multi-level joints, no holes for binding, and epoxy resin coating. This effectively reduces no-load loss, no-load current, and noise.
2. Windings: Low-voltage foil type, high-voltage wire winding / foil type structure, vacuum pressure epoxy resin casting, with internal and external glass fiber reinforcement. It has high mechanical strength, strong anti-short-circuit ability, moisture-proof, dust-proof, no cracking, and extremely low partial discharge.
3. Safety and Environmental Protection: Oil-free, flame-retardant self-extinguishing, no toxic gases during combustion. Can be directly installed at the load center, maintenance-free, pollution-free, with a lifespan of over 30 years.
4. Heat Dissipation and Temperature Control: Axial ventilation channel + forced air cooling (AF), with strong overload capacity; equipped with PT100 temperature measurement and intelligent temperature controller, achieving over-temperature alarm, automatic fan start-stop and remote monitoring.
5. Insulation Performance: 35kV grade main insulation and longitudinal insulation reinforcement design, resistant to lightning strikes, meeting industrial frequency withstand voltage standards, suitable for harsh environments such as humidity, dust, and salt fog.
1. Core: Utilizes high-quality cold-rolled grain-oriented silicon steel sheets, with 45° fully inclined multi-level joints, no holes for binding, and epoxy resin coating. This effectively reduces no-load loss, no-load current, and noise.
2. Windings: Low-voltage foil type, high-voltage wire winding / foil type structure, vacuum pressure epoxy resin casting, with internal and external glass fiber reinforcement. It has high mechanical strength, strong anti-short-circuit ability, moisture-proof, dust-proof, no cracking, and extremely low partial discharge.
3. Safety and Environmental Protection: Oil-free, flame-retardant self-extinguishing, no toxic gases during combustion. Can be directly installed at the load center, maintenance-free, pollution-free, with a lifespan of over 30 years.
4. Heat Dissipation and Temperature Control: Axial ventilation channel + forced air cooling (AF), with strong overload capacity; equipped with PT100 temperature measurement and intelligent temperature controller, achieving over-temperature alarm, automatic fan start-stop and remote monitoring.
5. Insulation Performance: 35kV grade main insulation and longitudinal insulation reinforcement design, resistant to lightning strikes, meeting industrial frequency withstand voltage standards, suitable for harsh environments such as humidity, dust, and salt fog.
IV. Core Advantages of 35kV Voltage Level
Simplifies the power grid: Directly drops from 35kV to 0.4kV, reducing the need for 10kV substations, and lowering investment, line loss, and operation and maintenance costs.
Larger capacity: The maximum single-unit capacity is 25,000 kVA, suitable for large-scale load concentration areas and power supply for high-power equipment.
High reliability: The 35kV system has better stability than the 10kV system, suitable for important users and core power distribution scenarios.
More space-efficient: Compared to oil-immersed transformers, it has a smaller volume, lighter weight, no need for fire separation distances or oil pools, and is suitable for indoor, underground, and space-constrained locations.
V. Selection Suggestions
For conventional renovations / with limited budget: Choose SCB12, meeting national standards and having the lowest cost.
For new construction / prioritizing cost-effectiveness: Choose SCB14, balancing energy efficiency and cost, with the widest application range.
For extreme energy saving / for core scenarios: Choose SCB18, with first-level energy efficiency, ultra-quiet operation, long lifespan, and optimal for high-load and high-price areas.
For harsh environments / with high reliability requirements: All series can be selected with IP54, H-level insulation, anti-corrosion reinforcement, suitable for humid, dusty, and corrosive environments.
Simplifies the power grid: Directly drops from 35kV to 0.4kV, reducing the need for 10kV substations, and lowering investment, line loss, and operation and maintenance costs.
Larger capacity: The maximum single-unit capacity is 25,000 kVA, suitable for large-scale load concentration areas and power supply for high-power equipment.
High reliability: The 35kV system has better stability than the 10kV system, suitable for important users and core power distribution scenarios.
More space-efficient: Compared to oil-immersed transformers, it has a smaller volume, lighter weight, no need for fire separation distances or oil pools, and is suitable for indoor, underground, and space-constrained locations.
V. Selection Suggestions
For conventional renovations / with limited budget: Choose SCB12, meeting national standards and having the lowest cost.
For new construction / prioritizing cost-effectiveness: Choose SCB14, balancing energy efficiency and cost, with the widest application range.
For extreme energy saving / for core scenarios: Choose SCB18, with first-level energy efficiency, ultra-quiet operation, long lifespan, and optimal for high-load and high-price areas.
For harsh environments / with high reliability requirements: All series can be selected with IP54, H-level insulation, anti-corrosion reinforcement, suitable for humid, dusty, and corrosive environments.