33/11kV Oil-Immersed Power Transformer
Quick Product Summary
- Model: PP-PT-33/11-10MVA
- Capacity: 2.5 MVA - 20 MVA (ONAN/ONAF)
- Standard: IEC 60076, BS 171, BNBC
- Manufacture: Positive Power Gazipur
Technical Sales Inquiry:
Direct Phone: +880 1712-345678
Email: info@positivepowerbd.com
Engineering Overview & Scope
Positive Power Bangladesh Ltd designs and manufactures heavy-duty 33/11kV oil-immersed power transformers tailored for primary utility substations, captive power plants, and large-scale industrial manufacturing complexes across Bangladesh.
Each unit is engineered with high-grade, cold-rolled grain-oriented (CRGO) magnetic silicon steel sheets with step-lap mitered core joints to minimize no-load losses and acoustic emissions. Windings utilize 99.9% high-conductivity electrolytic copper insulated with thermally upgraded kraft paper to guarantee exceptional mechanical withstand capability during external short-circuit transients.
Key Protective Features
- Conservator tank design with dehydrating silica gel breather and magnetic oil level gauge (MOG).
- Double-float Buchholz relay for early detection of internal winding insulation breakdown and oil gas accumulation.
- Winding Temperature Indicator (WTI) and Oil Temperature Indicator (OTI) with dual alarm and trip micro-switches.
- Spring-loaded Pressure Relief Device (PRD) with rapid micro-switch tripping.
- Option for manual off-circuit tap changer (OCTC) or automatic on-load tap changer (OLTC).
Key Engineering Advantages
- High-grade prime CRGO silicon core with step-lap mitered joints
- 99.9% IACS high-conductivity copper conductor windings
- Conservator tank with silica gel breather & magnetic oil level gauge
- Double-float Buchholz relay protection & pressure relief valve
- WTI and OTI temperature indicators with dual alarm/trip contacts
- Option for Off-Circuit (OCTC) or On-Load Tap Changer (OLTC)
Primary Industrial Applications
- ▪ 33/11 kV Utility Intake Grid Substations
- ▪ Heavy Steel Re-Rolling Mills & Melting Plants
- ▪ Textile Spinning & Denim Weaving Complexes
- ▪ Cement, Fertilizer & Chemical Manufacturing Plants
Comprehensive Technical Specifications
Manufactured and rigorously tested according to international IEC standards and certified by BUET (Bangladesh University of Engineering and Technology).
| Technical Parameter | Engineering Specification |
|---|---|
| Rated Capacity | 2.5 MVA to 20 MVA (ONAN / ONAF) |
| Primary Rated Voltage | 33 kV ± 2 x 2.5% (or OLTC ± 8 x 1.25%) |
| Secondary Rated Voltage | 11 kV |
| Rated Frequency | 50 Hz |
| Vector Group | Dyn11 / YNd11 |
| Type of Cooling | ONAN (Natural) / ONAF (Forced Air) |
| Insulation Class | Class A (Oil Immersed) |
| Basic Impulse Level (BIL) | 170 kV (33kV) / 75 kV (11kV) |
| Temperature Rise Limit | 50°C (Oil) / 55°C (Winding) at 45°C Ambient |
| Testing Standards | Routine tested per IEC 60076 & BUET Certified |
🔬 Routine & Type Testing
100% factory routine tests including Megger insulation, dielectric breakdown, turns ratio, load/no-load losses, and temperature rise per IEC 60076.
🏛️ BUET Tested & Endorsed
Independently verified and type-tested through Bangladesh University of Engineering and Technology (BUET) electrical testing laboratories.
🛡️ 18-Month Warranty & Support
Full warranty backing with 24/7 on-site emergency technical support, genuine OEM spare parts, and annual preventive maintenance contracts.
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