SC(B)13 Epoxy Resin Cast Dry-Type Transformer | XIAOPAI Electric
SC(B)13 Epoxy Resin Cast Dry-Type Transformer: Vacuum Casting, Zero Partial Discharge
1
Introduction: The Cast-Resin Workhorse
Where fire safety, indoor placement, and low maintenance matter, the epoxy resin cast dry-type transformer is the default choice — from high-rise buildings and hospitals to data centers and rail systems (Article 11 mapped these settings). Among the cast-resin family, the SC(B)13 series is the efficiency-leading, low-loss grade widely promoted for modern civil and critical infrastructure. This article explains what makes it special: a vacuum-casting process that seals the windings in solid, bubble-free epoxy, reinforced by glass-fiber mesh, delivering low loss, near-zero partial discharge, and rugged reliability.
2
Technical Principle: Vacuum Casting Step by Step
The heart of an SC(B)13 is its winding — not wound in air, but cast in solid epoxy under vacuum. The goal is a dense, sealed, void-free coil: bubbles are the enemy, because any trapped air becomes a site for partial discharge and eventual breakdown.
In practice: an F- or H-class epoxy compound with mineral filler is first homogenized, then degassed by a thin-film vacuum process to strip every bubble. The high- and low-voltage windings are then cast in thin layers under vacuum and pressure, with glass-fiber forming mesh on both inner and outer surfaces. The result is a coil that is mechanically tough, electrically strong, and thermally resistant — and crucially, free of internal voids. The low-voltage winding often uses a foil structure with radial cooling air ducts, while the core is built from high-quality CRGO silicon steel with a 45° full step-lap joint (Article 10), minimizing no-load loss and noise.
3
Key Features
Low no-load loss: SC(B)13 cuts no-load loss by roughly 20%+ versus SCB10 and about 11% versus SCB11 — strong savings where load runs light for long hours (offices, malls, hospitals).
Ultra-low partial discharge: With thorough vacuum degassing and pressure casting, discharge is held below 10 pC (often <5 pC on advanced lines) — the key to long insulation life.
Low noise: The step-lap CRGO core and solid casting keep sound 10–15 dB below the JB/T 10088 reference, suiting schools, hospitals, and residences.
Fire safety, no oil: Glass-fiber and epoxy are self-extinguishing; no arc forms on short circuit, and no toxic gas is released at high temperature. No oil means no sprinkler system, no containment pit.
High mechanical strength: Filler resin shrinks little and matches the thermal expansion of the embedded reinforcement, giving a concrete-like dense structure that withstands sudden short-circuit forces without cracking.
Thermal class F/H: Insulation rated 155 °C (F) or 180 °C (H); cooling is natural air (AN), with forced air (AF) added above ~200 kVA for extra capacity.
3.1 How SC(B)13 Compares on Loss
No-load loss drops steadily across the cast-resin generations. Indexing SCB10 at 100:
4
Application Scenarios
Because it is oil-free, fire-safe, and quiet, SC(B)13 fits exactly the critical, indoor, and populated settings from Article 11:
| Setting | Why SC(B)13 |
|---|---|
| High-rise & commercial buildings | Indoor placement at the load center, no sprinkler pit, low noise |
| Hospitals & airports | Fire safety, reliability, low sound; often with AF cooling + temp control |
| Data centers | Oil-free, low loss, modular; pairs with smart temperature control (Article 15 topic) |
| Rail transit & EV charging | Compact, quick to install, robust against fluctuating loads |
| Renewables (wind / PV / BESS) | Low no-load loss pays off under intermittent generation |
5
Selection Guide: Five Checks Before Specifying
Capacity & voltage: Typical range ~30–2500 kVA, 6/10/11 kV primary to 0.4 kV; 35 kV and 60 Hz variants available — match the local network and load.
Cooling mode: Choose AN (natural air) for standard duty; add AF (forced air) above ~200 kVA or for overload headroom.
Insulation class:F (155 °C) is standard; specify H (180 °C) for harsher thermal duty or longer life.
Protection rating:IP20 indoor is baseline; request IP54 for dust/moisture resistance in tougher rooms.
Monitoring & certification: Add a PT100-based temperature system with over-temp alarm/trip and RS485/IoT interface, and confirm IEC 60076-11, GB 20052 Level 1, UL/CE compliance from a full-capability supplier such as XIAOPAI Electric.
6
Conclusion: Sealed, Safe, and Efficient
The SC(B)13 is what a modern dry-type transformer should be: its windings are sealed in void-free epoxy under vacuum, armored with glass fiber, and mounted on a low-loss step-lap CRGO core. The payoff is tangible — lower energy bills, quieter operation, near-zero partial discharge for a long insulation life, and oil-free fire safety that lets it sit right at the load center. For the critical, indoor, and populated settings that define today's distribution networks (Article 11), XIAOPAI Electric's SC(B)13 line turns that engineering into a certified, supported product — backed by ISO 9001, CE, and UL and ready for global delivery.
For ratings, datasheets, type-test reports, and project engineering, contact the XIAOPAI Electric technical team.
