Product Details of 35kV SCB14 Epoxy Resin Cast Dry-Type Transformer

I. Product Overview

The 35kV SCB14 epoxy resin cast dry-type transformer is a high-performance, ultra-low-loss, high-reliability mainstream upgraded model in medium‑ and high‑voltage distribution systems. It belongs to the Type 14 ultra-low-loss series, with further optimized electromagnetic design, losses, noise, insulation and mechanical strength based on SCB13.

It features an oil-free structure, vacuum epoxy casting and foil winding, with outstanding performance in fireproofing, explosion-proofing, moisture-proofing, dust-proofing, short-circuit withstand and maintenance-free operation.

It is widely used in power grids, industrial and mining enterprises, data centers, airports, subways, hospitals, chemical plants, new energy stations and other places with strict requirements for safety and energy efficiency.

Model designation:

• S: Three-phase transformer

• C: Epoxy resin cast insulation

• B: Low-voltage foil winding

• 14: Performance code (Type 14 low-loss)

• 35kV: Rated high voltage level

Applicable standards:

GB/T 10228, GB 1094.11, GB 20052, IEC 60076 series.

Flame retardant class: FV‑0; environmentally friendly and oil‑free.

II. Key Technical Parameters(Customizable)

• Rated voltage: 35kV (off‑circuit tap ±2×2.5%) / 0.4kV

• Rated capacity: 30kVA～3150kVA (commonly 630～2500kVA)

• Connection group: Dyn11 (standard)

• Frequency: 50Hz

• Insulation class: Class F (155℃)

• Cooling mode: AN (natural cooling) / AF (forced air cooling)

• Protection degree: IP20 / IP30 / IP40

• Short‑circuit impedance: 6% (standard)

• Partial discharge: ≤5 pC

• Noise level: 45～52 dB(A)

• Ambient temperature: -25℃～+45℃

• Altitude: ≤1000m (plateau type customizable)

Loss improvement (vs. SCB13):

• No‑load loss reduced by 10%～15%

• Load loss reduced by 8%～12%

• Lower no‑load current, higher power factor, lower grid loss

III. Structural & Technological Features

1. Core – Ultra-low loss & ultra-low noise

• High‑permeability grain‑oriented silicon steel, thickness at 0.27mm level.

• Multi-step step-lap joint for uniform magnetic circuit, lower magnetic resistance and vibration.

• Full epoxy coating for moisture, rust and corrosion resistance.

• High-strength non-magnetic binding ensures rigid structure, no loosening or abnormal noise during transportation and operation.

2. Winding – High strength, high insulation, strong short-circuit withstand

• Low-voltage foil winding: made of oxygen‑free copper foil, uniform current distribution, low eddy current loss.

• High-voltage multi-layer cylindrical winding: balanced ampere‑turns, excellent short‑circuit withstand capability.

• Vacuum epoxy casting with fiberglass reinforcement: no bubbles, no voids, no weak points.

• High insulation strength, shock‑resistant, moisture‑resistant, pollution‑tolerant, non‑cracking.

• Flame retardant Class FV0: smokeless, non‑toxic, self‑extinguishing.

3. Temperature control & intelligent monitoring

• PT100 platinum resistors embedded in windings for accurate temperature measurement.

• Intelligent temperature controller: over‑temperature alarm, trip, automatic fan control, fault memory.

• Standard RS485/Modbus for SCADA, power monitoring and unattended systems.

• Optional: optical fiber temperature measurement, IoT remote monitoring, harmonic detection, dehumidifying & heating device.

4. Assembly & enclosure

• Integrally cured structure, high mechanical strength, anti‑seismic and anti‑short‑circuit.

• Fully sealed design: moisture‑proof, dust‑proof, salt‑fog resistant, anti‑condensation.

• Steel enclosure with electrostatic spraying, aesthetic, anti‑corrosion and durable.

• Optimized ventilation louvers for high heat dissipation efficiency.

IV. Core Performance Advantages

1. Higher energy efficiency & lower operating cost

• Type 14 ultra-low-loss design, more energy‑saving than SCB13.

• Ideal for 24‑hour high-load continuous operation.

• Low reactive loss improves grid power factor and reduces compensation investment.

2. Extremely high safety level

• Oil‑free, no leakage, no fire or explosion risk.

• Can be installed indoors, in basements or at load centers directly.

• No oil pits, firewalls or fire pipelines required, greatly reducing construction cost.

3. Excellent short-circuit withstand capability

• Foil + cylindrical winding structure far exceeds national standards.

• High integrity insulation, resistant to cracking and aging, high long‑term reliability.

4. Ultra-low noise & environment-friendly

• Noise is 2–5 dB(A) lower than SCB13, generally ≤50 dB(A).

• Suitable for residential areas, hospitals, schools, office buildings and other noise‑sensitive areas.

5. Strong environmental adaptability

• Moisture-proof, dust-proof, salt-fog resistant, pollution-tolerant, anti-condensation.

• Stable operation in coastal, chemical, mining, humid and dusty environments.

• No pre‑drying needed before restart after long shutdown.

6. Maintenance-free & long service life

• No oil system, so no oil change, filtration or testing required.

• Routine maintenance only includes dust cleaning and connection checking.

• Service life up to over 30 years under normal conditions.

V. Typical Applications

• Power grid systems: 35kV substations, urban distribution networks, industrial park step-down stations, energy-saving renovation.

• High-end public buildings: airports, subways, high-speed rail stations, hospitals, schools, shopping malls, office buildings, high-rise buildings.

• Data centers & new energy: IDC, cloud computing centers, PV power stations, wind farm collector stations, energy storage systems.

• Hazardous industrial environments: chemical, petroleum, coal, pharmaceutical, metallurgical and flammable & explosive sites.

• Harsh environments: coastal high salt fog, high humidity, heavy pollution, plateau and low-temperature areas.

VI. Installation, Operation & Maintenance

• Install on a level foundation with good ventilation.

• Reliable earthing of enclosure, earthing resistance ≤4Ω.

• Pre-commissioning tests: insulation resistance, transformation ratio, DC resistance, withstand voltage.

• Regularly clean fans, filters and enclosure dust to ensure good heat dissipation.

• Periodically check terminals, fasteners, temperature controller and fans.

• No oil maintenance required – almost trouble-free after installation.