Product Details of 35kV SCB13 Epoxy Resin Cast Dry-Type Transformer

I. Product Definition & Applicable Standards

The 35kV SCB13 epoxy resin cast dry-type transformer is an ultra-low-loss, high-reliability power transformer developed in accordance with China’s national Level 1 energy efficiency standard. As an upgraded version of the SCB12 series, it achieves comprehensive improvements in loss control, noise reduction, insulation performance, short-circuit withstand capability and intelligent monitoring, making it a high-end benchmark product in the 35kV medium‑voltage distribution field.

Model explanation:

• S: Three-phase transformer for large-scale industrial & civil power supply

• C: Epoxy resin cast insulation with high heat resistance and flame retardance

• B: Foil winding made of high‑precision oxygen‑free copper foil

• 13: Performance level meeting Level 1 energy efficiency (GB 20052-2024)

• 35kV: Rated high voltage

This transformer complies with:

• GB 20052-2024 Limit Values and Energy Efficiency Levels of Power Transformers (Level 1)

• GB/T 10228-2015 Dry-type Power Transformers – Technical Parameters and Requirements

• GB 1094.11-2013 Power Transformers – Part 11: Dry-type Transformers

• IEC 60076 series (international standard for export projects)

• GB/T 14598.13-2018, GB/T 14099.1-2018

Insulation class: Class F (155℃ max operating temperature)

Insulation level: 35kV class – power frequency withstand 70kV, lightning impulse 170kV

Flame retardance: Class FV‑0, no supporting combustion, no toxic fumes.

Oil‑free structure eliminates oil leakage, fire and explosion risks. It is the preferred equipment for projects with strict environmental and fire safety requirements.

II. Key Technical Parameters(Customizable)

III. Structural Design Features

• Core (Optimized for Low Loss & Low Noise)

  0.27–0.30mm high‑permeability grain‑oriented silicon steel, thinner than SCB12.

  7‑step step‑lap joint for uniform magnetic circuit, lower hysteresis and eddy loss.Epoxy coating for moisture, rust and corrosion resistance.Non‑magnetic binding and special clamping structure reduce vibration and noise.

• Winding (Upgraded Process, High Reliability)

  LV winding: high‑precision oxygen‑free copper foil for uniform current and low eddy loss.

  HV winding: multi‑layer cylindrical structure with balanced ampere‑turns.Vacuum epoxy casting with fiberglass reinforcement, no bubbles or voids.High mechanical strength against short‑circuit and lightning impulse.FV‑0 flame retardant epoxy, no toxic fumes.Partial discharge ≤5 pC.

• Cooling & Temperature Control

  Dual cooling mode: AN / AF.

  Fans automatically controlled by winding temperature.PT100 sensors embedded inside windings for accurate measurement.Intelligent controller: alarm, trip, auto fan, fault pre‑warning.Optical fiber temperature measurement available for high‑end applications.

• Intelligent Monitoring System

  Standard RS485 (Modbus) for SCADA, power monitoring and smart O&M platforms.

  Supports real‑time data acquisition, fault diagnosis and status pre‑alarm.IoT terminal and mobile APP remote monitoring optional for unmanned substations.

• Enclosure & Protection

  Cold‑rolled steel with electrostatic spraying, corrosion‑resistant.

  Optimized ventilation louvers.IP30/IP40 with rain cover and dust net for outdoor, coastal and polluted areas.Detachable structure for easy maintenance.

• Tap Changer & Wiring

  Off‑circuit tap changer, sealed, moisture‑proof and dust‑proof.

  LV copper bar terminals for easy wiring and expansion.Insulation shields for safety.

IV. Core Performance Advantages (vs SCB11 / SCB12)

• Top Level 1 Energy Efficiency

  No-load loss ↓8%–10% vs SCB12, ↓20% vs SCB11.

  Load loss ↓5%–7% vs SCB12, ↓15% vs SCB11.A 1000kVA unit saves about 1200–1500 kWh/year vs SCB11 and 500–600 kWh/year vs SCB12.Over 30-year life cycle, electricity cost savings exceed 20,000 RMB.

• Ultra-Low Noise & Eco-Friendly

  Noise: 48–52 dB(A), 2–3 dB(A) lower than SCB12, 10–15 dB(A) below industry standard.

  Ideal for hospitals, schools, residential areas, offices and data centers.

• Ultra-Safe & Oil-Free

  No oil leakage, fire or explosion risks.

  FV‑0 flame retardant, no toxic gas.Can be installed directly in basements, high-rises and crowded buildings without oil pits or fire compartments.

• High Reliability & Strong Short-Circuit Withstand

  Partial discharge ≤5 pC, slow insulation aging.

  Foil winding and cylindrical HV winding withstand repeated short circuits.Class F insulation supports 120% load (AN) and 150% load (AF).

• Strong Environmental Adaptability

  Fully sealed: moisture-proof, dust-proof, salt-fog resistant, anti-condensation.

  Stable in coastal, chemical, high-humidity and dusty environments.No pre-drying needed after long shutdown.Maintenance-free (no oil change/refill).Service life ≥30 years.

• High Intelligence for Smart Grid

  Standard intelligent control and RS485 communication.

  Supports remote monitoring and unmanned operation.Compact, light, flexible for indoor and outdoor installation.

V. Typical Applications

• Power grid: 35kV smart substations, urban/rural grid upgrading, industrial parks

• High-end buildings: offices, malls, hotels, subways, airports, hospitals, schools

• Data centers & new energy: IDC, cloud computing, PV, wind farms, energy storage stations

• Special industry: chemical parks, coal mines, oil refineries, pharmaceuticals, offshore platforms

• Coastal, high-humidity, high-salt-fog areas

• Eco-sensitive zones: residential areas, schools, ecological protection zones, green buildings

VI. Installation, Operation & Maintenance

• Installation

  Level concrete foundation with sufficient load capacity.

  Good ventilation; temperature difference ≤15℃ between inlet and outlet.No sealed installation without ventilation.Correct tap position; tightened terminals.Reliable grounding (resistance ≤4Ω).No collision or vibration during installation.

• Routine Maintenance

  Clean enclosure, vents and filters every 3 months.

  Check temperature controller functions monthly.Inspect and tighten connections every 6 months; test insulation.Check tap changer every 12 months.No oil maintenance required.Increase inspection frequency in harsh environments.

• Commissioning & Preventive Tests

  Pre-commissioning: insulation resistance, ratio, vector group, DC resistance, withstand voltage, partial discharge.

  Preventive tests every 5 years: dielectric loss, partial discharge, winding resistance, insulation evaluation.All tests performed by qualified personnel.

• Fault Handling

  Over-temperature alarm: check load, ventilation and controller.

  Trip: eliminate short circuit, overload or insulation fault before restart.Abnormal PD or low insulation: shut down for maintenance immediately.Only professional electricians allowed for repair.

• Storage & Transportation

  Store in dry, ventilated, clean warehouse.

  Test insulation every 3 months.Securely fixed during transportation; moisture-proof, dust-proof, collision-free.Inspect appearance and insulation after arrival.

VII. Selection & Customization Suggestions

• Capacity: Select at 70%–80% load rate, 15%–20% margin for future expansion.

• Cooling: AN for ≤630kVA & stable load; AF for >630kVA, high temperature or fluctuating load.

• Protection Degree: IP20 for clean indoor; IP30 for dusty workshops; IP40 for outdoor/coastal.

• Options: RS485/IoT for remote monitoring; heating for low temperature; anti-fouling windings; optical fiber temperature measurement; Yyn0 connection.

• Customization: Special voltages, tap ranges, short-circuit impedance, capacities, outdoor enclosures available.

VIII. Warranty & After-Sales Service

• Full-process quality control; all units pass insulation, loss and partial discharge tests before delivery.

• 5-year warranty: free repair and replacement for non-human quality defects.

• Lifetime technical support: on-site installation guidance, operation training, troubleshooting.

• 24-hour after-sales hotline for fast response and on-site service.