Q1: What are the key specifications of the SCB18-800/10?

It is a three-phase cast-resin dry-type distribution transformer, rated 800 kVA, primary 10 kV (±2×2.5% tap), secondary 0.4 kV, vector group Dyn11, 50 Hz, F-class insulation, 100 K temperature rise, IP00 (or IP20 with enclosure). Designed and tested to GB/T 1094.11 and GB/T 22072, manufactured under ISO 9001.

Q2: How does SCB18 compare to SCB14 or SCB12 in energy efficiency?

SCB18 meets GB 20052-2020 Grade 1 energy efficiency (the highest level for silicon-steel dry-type). For an 800 kVA unit, typical no-load loss is ≈0.7 kW (SCB18) vs 0.885 kW (SCB14) vs 1.04 kW (SCB12) — about 20% lower than SCB14 and 33% lower than SCB12. Over a 25-year life cycle in a 24h plant, the energy saving easily covers the 10-15% price premium.

Q3: Why is a cast-resin dry-type transformer ideal for urban mining and e-waste recycling facilities?

Three reasons: ① fire safety — epoxy resin + self-extinguishing, flame-retardant, halogen-free materials; no oil means no fire or explosion risk near combustible e-waste; ② moisture resistance — high dielectric strength epoxy works in humid, occasionally wet recycling halls; ③ maintenance-free — no oil, no conservator, no periodic testing, so operation is unaffected by dust and contamination typical in recycling lines.

Q4: What does “self-extinguishing, flame-retardant, halogen-free” mean in a real fire scenario?

If a fault or external fire occurs, the epoxy body stops burning within seconds after the ignition source is removed (self-extinguishing), does not propagate flame, and releases no corrosive halogen gas when heated. This is critical in recycling halls where plastic, cable, and PCB materials can release toxic fumes. It also protects downstream equipment and evacuation routes.

Q5: How much noise does the SCB18-800/10 produce?

Under normal operation, ≤55 dB(A) at 1 m (typical for 800 kVA cast-resin dry-type per GB/T 1094.10). For noise-sensitive sites (offices, control rooms), add anti-vibration pads (-5 dB) or an IP20/IP23 enclosure (-3-5 dB) to bring it down to ≈50 dB.

Q6: What are the typical dimensions and weight of an 800 kVA cast-resin transformer?

Reference values from similar industry models: approx. 1500 (L) × 1200 (W) × 1700 (H) mm, weight ≈2850-3200 kg (bare) / up to 3500 kg (with IP20 enclosure). Final dimensions and foundation drawing come with our GA. Floor load capacity should be ≥600 kg/m² and the room needs crane access or forklift route for placement.

Q7: Does the unit need oil or regular maintenance?

No oil, no conservator, no oil-level checks, no oil dielectric testing. Routine maintenance is limited to: ① yearly visual inspection of connections and enclosure; ② checking the temperature controller and fan operation (if equipped); ③ cleaning dust from ventilation grilles. Total annual maintenance time is typically under 2 hours, far lower than oil-immersed units.

Q8: How does the partial discharge (PD) level affect reliability?

This unit is designed to keep PD ≤5 pC (premium grade per GB/T 22072), well within the qualified limit of ≤10 pC. Lower PD means slower insulation aging, longer service life (25-30 years), and no risk of insulation failure from voltage spikes generated by upstream VFDs or switching transients in modern recycling equipment.

Q9: What optional accessories can be added, and when are they needed?

• Temperature controller (PT100 + display): required for any installation where remote alarm / trip is needed — strongly recommended for 24h recycling operations.
• Cooling fans (AF upgrade): adds 30-40% short-term overload capacity; useful if future load growth is expected.
• Protective enclosure (IP20 / IP21 / IP23): needed for public-access areas, dust-heavy halls, or to drop noise by 3-5 dB.
• Castors / wheels: simplify installation and future relocation.

Q10: What tests and certifications are included, and what should we check on delivery?

Every unit ships with a routine test report (ratio, DC resistance, insulation, AC withstand, induced voltage, no-load/load loss, impedance, noise, temperature-rise — 9 items per GB/T 1094.11). On arrival, we recommend re-test of ① insulation resistance and AC withstand (to confirm no transport damage) and ② ratio + vector group (Dyn11 polarity must be correct). If the tender requires a third-party witnessed Type Test (KEMA, CEPRI, TÜV, or DEKRA), please specify in the PO — lead time 4-6 weeks.

Export-standard plywood crate with waterproof plastic film lining. Each transformer is securely fixed on a steel base frame with lifting lugs. Suitable for sea, air, and land transportation. Gross weight and dimensions will be confirmed in the final packing list.