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132KV 75MVA 3 Phase Power Transformer

The 132 kV 75 MVA 3‑Phase Power Transformer is a heavy‑duty, oil‑immersed unit engineered for high‑voltage transmission networks. It complies with IEC 60076 and EN standards, delivering over 99 % efficiency under full load. Its conservator‑type tank with self‑regenerating silica‑gel breather maintains oil purity and volume under temperature swings. Equipped with a ±5 % (2×2.5 %) on‑load tap changer on the HV side, it provides precise voltage control to stabilize downstream equipment. The IP55‑rated enclosure shields internal components from dust and water ingress, ensuring reliable outdoor operation. Forced oil‑air cooling (ONAF) plus natural cooling (ONAN) enables continuous operation at 75 MVA and short‑term overload up to 82 MVA without thermal stress.

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Product Accessories

Conservator with Magnetic Oil Level Indicators (–20 °C to +100 °C, alarm contacts)

Twin‑Float Buchholz Relay for gas‑and‑oil surge detection, with alarm/trip contacts

Pressure‑Vacuum Gauge to monitor tank integrity and detect leaks

Oil Temperature Indicator (dial‑type, adjustable alarm contacts)

Winding Temperature Indicator (PT100 sensor, four contacts)

Overpressure Relief Valve with semaphore and trip contacts

Self‑Regenerating Silica‑Gel Breather to prevent moisture ingress

HV/LV Porcelain Bushings rated to 350 kV/150 kV BIL

Detachable Radiators & Fans for ONAF stage, galvanized & gasketed

316 Stainless‑Steel Nameplates & Grounding Lugs for durable identification and safety

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Product Specifications

Rated Power

75 MVA

Primary Voltage

132 kV

Secondary Voltage

33 kV

Frequency

50/60Hz

Cooling Method

ONAN / ONAF

Tap Changer

±5 % (2×2.5 %) OLTC on HV side

Efficiency

≥ 99 % at full load

Impedance

10 % at 75 MVA

Top‑Oil Temperature Rise

50 °C (per IEC 60076‑2)

Ingress Protection (IP)

IP55

Product Applications

Economy is more affordable

Step‑down from 132 kV to regional distribution voltages with minimal losses.

High‑Voltage Transmission Substations
Feed large process plants (steel, petrochemical) requiring stable high‑capacity supply.

Industrial Energy Hubs
Interface wind and solar farms to the grid with precise voltage control under variable generation.

Renewable Power Plants
Support data centers, hospitals, and transportation networks where uninterrupted power is essential.

Critical Infrastructure

Product Advantages

Superior Thermal Management

Dual‑mode cooling (ONAN/ONAF) and robust radiator design maintain optimal operating temperatures, enabling full‑load and overload operation without accelerated aging.

Precision Voltage Regulation

A ±5 % on‑load tap changer ensures fine voltage adjustments under live load, stabilizing downstream systems against fluctuations.

Robust Environmental Protection

IP55 enclosure, silica‑gel breather, and galvanized radiators deliver resilience in dusty, wet, or corrosive outdoor environments, reducing maintenance needs and downtime.

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.

132KV 3 Phase Power Transformer 75MVA 3 Phase Power Transformer 132KV 75MVA 3 Phase Power Transformer

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