oil filled transformers - Jiangsu Shendian Electric Co., Ltd.

Key Features

Three-phase oil-immersed design — 10kV/0.4kV step-down for industrial, urban and mining grids.
Low-loss silicon steel core — Grain-oriented steel with step-lap construction cuts no-load losses and improves operating efficiency.
Copper windings — High mechanical strength and excellent short-circuit withstand for long-term reliability.
Natural oil circulation cooling (ONAN) — Corrugated fin radiator design ensures stable temperature rise without forced cooling.
Sealed, maintenance-free tank — Corrugated or conservator-type tank keeps moisture out and extends service life.
Quiet operation — Low noise and low temperature rise make it suitable for urban and residential installations.

Typical Applications

Industrial plants and manufacturing workshops
Urban 20kV distribution networks and city power supply
Mining sites, infrastructure and construction projects
Small substations and prefabricated (box-type) substations
Commercial buildings, shopping malls, and hotels
Renewable energy step-down / step-up stations (PV / wind auxiliary supply)

Standards & Certifications
Products:CE certificates
Design Standards: IEC60076 Standard
Quality System: ISO 9001
Factory certificates:ISO14001,ISO45001

Q1. What oil-immersed transformers does SHENDIAN manufacture?
Three-phase oil-immersed transformers for 10, 20 and 35 kV systems — distribution ratings from 30 to 3150 kVA, larger 35 kV power units per project. Series: S13, S20, S22 and SH15 amorphous-alloy. Fully sealed, maintenance-free designs. Factory since 2007.

Q2. Oil-immersed or dry-type — which should I choose?
Oil-immersed units cost less and dissipate heat better — ideal for outdoor sites. Dry-type units are oil-free and fire-safe — preferred indoors. We build both; tell us your site conditions and we’ll recommend.

Q3. Which standards do your transformers comply with?
IEC 60076 series — Part 1 (general), Part 2 (temperature rise, ONAN), Part 3 (insulation levels), Part 5 (short-circuit withstand), Part 10 (sound level), Part 20 (energy efficiency). Factory certified to ISO 9001 / 14001 / 45001 and CE.

Q4. Can voltage ratio and capacity be customized?
Yes. Common ratios include 10/0.4, 20/0.4, 6/0.4, 35/0.4 and 35/10.5 kV. Distribution capacity 30–3150 kVA; custom ratings per project.

Q5. Copper or aluminum windings?
Both. Copper is standard on higher ratings for short-circuit strength; aluminum is available as a cost-down option.

Q6. Do you offer energy-efficient models?
Yes. S20 / S22 low-loss series, plus SH15 amorphous-alloy core — cuts no-load losses by up to 60% and has passed the national short-circuit test.

Q7. What accessories are included?
Standard: radiator, sealed or conservator tank, terminal box. Optional: off-circuit / on-load tap changer, temperature indicators, oil level gauge, protective enclosure.

Q8. Are the transformers suitable for cold climates?
Standard units work down to −25°C. Low-pour-point insulating oil (−45°C grade) is available for extreme-cold regions.

Q9. What tests are performed before shipment?
Every unit passes routine tests before leaving the factory. Type tests are arranged per project and completed before shipment — reports delivered with the goods.

Q10. What are your MOQ, lead time and warranty?
MOQ: one unit — we are a factory, trial orders welcome. Lead time: 30–45 days standard ratings, 60–90 days custom. Warranty: 12 months from commissioning or 18 months from shipment, whichever comes first.