1250kVA Oil Immersed Distribution Transformer 3PH IECS Oil Immersed Power Transformer

Production Process

• Qualifications: Custom transformers built to international standards with UL, ISO, CE, CQC, CCC certifications and comprehensive test reports
• Online Testing & Fast Delivery:
  • Fast delivery: 15-35 days
  • Online video factory inspection and product laboratory testing
• After-Sales Service:
  • 24-month warranty
  • Remote video installation guidance
  • Design drawings provided
  • Professional installation team available

Q1: What does IEC 60076 compliance mean for this transformer, and why is it important?
A1: IEC 60076 is the global authoritative standard for power transformers, covering design, manufacturing, testing, and performance requirements (including temperature rise, insulation levels, and safety criteria). Our 1250kVA transformer fully meets all IEC 60076 specifications, including type tests and special compliance tests, ensuring consistent quality, safety, and compatibility with global power grids. This compliance is critical for avoiding operational risks (e.g., insulation failure, overheating) and ensuring the transformer can integrate seamlessly into industrial, commercial, and utility systems worldwide.

Q2: How does the ONAN cooling system work, and what are its advantages for daily use?
A2: ONAN (Oil Natural Air Natural) cooling relies on natural circulation of high-quality mineral oil (for heat transfer and insulation) and ambient air to dissipate heat generated by transformer losses. The oil absorbs heat from the windings and core, rises to the tank surface, and transfers heat to the tank’s cooling fins, which then release it to the surrounding air—no external pumps or fans are required. Its key advantages include low maintenance (fewer moving parts to malfunction), long service life (up to 30 years with proper care), and cost-effectiveness, making it ideal for scenarios where continuous, reliable operation is prioritized.

Q3: Can the transformer’s capacity and voltage be customized beyond the stated ranges, and what factors need to be considered?
A3: Yes, customization is available beyond the standard 50-5000kVA capacity and 10-35KV (HV)/0.22-0.4KV (LV) voltage ranges, including custom impedance, tap range, and even cooling type adjustments if needed. Key considerations for customization include your specific grid requirements (e.g., short-circuit current limitation, voltage regulation), ambient temperature conditions (to ensure cooling efficiency), and application scenarios (industrial, commercial, or utility use). Our engineering team will conduct a detailed needs assessment to ensure the customized design maintains IEC 60076 compliance and optimal performance.

Q4: What routine maintenance is required to ensure the transformer’s long-term reliability?
A4: Routine maintenance focuses on preventing common faults (e.g., oil deterioration, cooling system blockage) and extending service life, following industry best practices. Recommended tasks include: daily checks of oil level and temperature; weekly inspection of cooling fins for dust/debris buildup; monthly oil leak checks and sampling; and annual laboratory testing (e.g.,winding resistance tests) to detect internal issues early. Additionally, keeping the transformer enclosure clean and checking for loose components or corrosion will help avoid costly downtime and ensure stable operation.

Q5: What safety features does this oil-immersed transformer have to prevent accidents?
A5: Safety is prioritized in line with IEC 60076 standards and industry best practices. Key safety features include: high-quality mineral oil with excellent insulation and fire-retardant properties; a robust, corrosion-resistant tank to prevent oil leaks (a common cause of fires); reliable insulation systems (CRGO silicon steel core and copper windings) to avoid short circuits; and compliance with strict temperature rise limits to prevent overheating. The transformer also supports integration with standard protective devices (e.g. ground protection) to detect faults and trigger shutdowns, minimizing accident risks.

Q6: What is the expected service life of this 1250kVA oil-immersed transformer, and how to extend it?
A6: Under normal operating conditions and proper routine maintenance, the expected service life of this transformer is 25-30 years, which aligns with IEC 60076 standard requirements for oil-immersed power transformers. To extend its service life, focus on three key aspects: first, strictly follow the recommended maintenance schedule (especially oil testing and cooling system cleaning); second, avoid overloading the transformer beyond its rated capacity (which can cause overheating and damage windings); third, ensure the installation environment is well-ventilated, free from corrosive gases, and within the specified ambient temperature range (typically -25℃ to 40℃). Regular professional inspections can also detect potential issues early and avoid irreversible damage.

Q7: Is this transformer suitable for outdoor installation, and what protections are available for outdoor use?
A7: Yes, this transformer is fully suitable for outdoor installation, with a robust design that adapts to harsh outdoor environmental conditions. For outdoor use, it is equipped with multiple protective measures: a corrosion-resistant, weatherproof enclosure (made of high-quality steel with anti-rust coating) to resist rain, dust, and extreme temperatures; sealed oil tank to prevent water ingress and oil deterioration; and reinforced cooling fins that can withstand outdoor dust and debris buildup. Additionally, the transformer’s insulation system is designed to resist moisture and UV radiation, ensuring stable performance even in long-term outdoor operation. It also complies with outdoor safety standards to avoid risks caused by weather factors (e.g., lightning, heavy rain).