500 Kva Three Phase Oil Immersed Transformer

Henan GNEE Electric Co., Ltd. is one of the most reliable manufacturers and suppliers of 500 kva three phase oil immersed transformer in China. If you're going to buy customized 500 kva three phase oil immersed transformer made in China, welcome to get quotation from our factory. Quality products and reasonable price are available.

The 500 kVA oil immersed transformer is a heavy-duty, three-phase, liquid-filled distribution transformer engineered for reliable outdoor pole-mounted or pad-mounted installation in utility substations, large commercial complexes, medium-to-heavy industrial facilities, data centers and suburban/rural distribution systems. Standard configuration includes mineral oil or FR3 natural ester fluid, ONAN cooling, copper or aluminum windings, and flexible high-voltage options from 4.16 kV to 34.5 kV.

Manufactured by GNEE Electric, the 500 kVA three-phase oil immersed distribution transformer delivers stable, efficient and long-lasting voltage conversion, backed by advanced production facilities, strict quality control and full factory test reports. Request a factory-direct quotation and receive complete technical documentation within 24 hours.

A 500 kVA oil immersed transformer is a three-phase distribution transformer in which the core and windings are immersed in insulating oil that provides both dielectric insulation and heat dissipation:

• Superior cooling – high-quality insulating oil effectively removes heat from the windings and core, reducing temperature rise and extending service life up to 20–30 years with proper maintenance.
• Balanced three-phase output – stable voltage regulation and strong anti-interference capability under complex grid conditions and fluctuating loads.
• Low-loss core – high-permeability cold-rolled silicon-steel sheets minimize no-load loss and long-term electricity cost.
• Robust windings – high-purity copper or high-grade aluminum with tight winding technology and excellent insulation withstand short-circuit impacts and voltage surges.
• Factory-tested reliability – every unit passes leakage testing and insulation testing, eliminating potential safety hazards and ensuring uninterrupted power supply in critical scenarios.

Tip: Specify the insulating fluid at quotation stage. Mineral oil is the most economical choice; FR3 natural ester fluid adds fire-safety margin and biodegradability, which is increasingly required for environmentally sensitive sites and indoor vaults.

• Energy efficiency first – high-permeability cold-rolled silicon-steel core minimizes no-load loss and reduces long-term electricity cost.
• Premium windings – high-purity copper (or high-grade aluminum, customizable) with tight winding technology and superior insulation to withstand short-circuit impacts and voltage surges.
• 20–30 year service life – effective oil cooling reduces temperature rise and slows insulation aging.
• Three-phase stability – balanced output, stable voltage regulation and strong anti-interference capability.
• Strict factory testing – leakage and insulation tests on every unit eliminate potential safety hazards in critical applications.

The 500 kVA oil immersed distribution transformer is a versatile power device for medium and large power users:

• Urban and rural grid reconstruction and utility substations
• Industrial manufacturing plants and mining operations
• Commercial complexes, hospitals, schools and transportation hubs
• Data centers and EV charging stations
• Agricultural irrigation systems
• Renewable energy projects (solar and wind power stations)

Its compact size and adaptability suit both indoor installation and outdoor pole-mounted / pad-mounted use, accommodating diverse site constraints. The transformer complies with IEC, IEEE, GB and CE standards, supporting export to North America, Europe, Southeast Asia, Africa and Oceania.

Tip: For pad-mounted projects with overhead or underground feed, choose the switching configuration (radial or loop feed) at quotation stage – this affects enclosure dimensions and protection scheme, and cannot be changed after manufacture.

The table below lists the standard series ratings (20 kV reference voltage class; 6–35 kV available per order). No-load and load losses are per GB/T 6451 design values.

As a direct manufacturer, GNEE offers:

• Large-scale production base and mature supply chain – mass production and short lead times, even for bulk orders.
• In-house R&D – continuous design optimization for energy efficiency and performance.
• Full factory testing – no-load test, load test, insulation withstand voltage test and partial discharge test, with complete test reports and certifications provided.
• Safe packaging and transportation – sturdy wooden cases, shockproof pads and moisture-proof measures.
• 24/7 consultation and after-sales support – customized scheme design and maintenance guidance from inquiry to after-use.

In summary, the 500 kva three phase oil immersed Distribution transformer manufactured by GNEE is a high-quality, cost-effective and reliable power distribution solution that combines advanced technology, durable construction and wide applicability.

Request A Quote

Whether you need standard products for immediate delivery or customized models for special projects, we have the capability to meet your demands with superior quality and competitive prices.

Send us your rated capacity, primary/secondary voltage, vector group, cooling requirement, fluid type and destination country. Our engineers will reply within 24 hours with a factory-direct quotation, loss data and delivery schedule.

📧 Email: sales@gneeelectric.com ｜ 💬 WhatsApp: +86 158 2468 7445

FAQ

Q1: What is the difference between ONAN and ONAF cooling?

ONAN (Oil Natural, Air Natural) is the standard self-cooled mode used at rated load. ONAF adds forced-air fans to increase the cooling capacity, allowing a higher continuous output when the transformer must temporarily carry heavier loads.

Q2: Can I choose copper or aluminum windings?

Yes. Copper windings are standard; aluminum is available as a cost-optimized option. Copper offers lower resistance loss and higher short-circuit strength; aluminum reduces first cost. Our engineers can run a total-cost-of-ownership comparison for your duty cycle.

Q3: Is mineral oil or FR3 natural ester fluid better?

Mineral oil is the most economical and widely used. FR3 natural ester offers a higher fire point and is biodegradable, which suits environmentally sensitive or fire-code-restricted installations. Both options are available.

Q4: What is the expected service life of the 500 kVA oil immersed transformer?

With proper maintenance, the design life is 20–30 years. Routine oil sampling, DGA analysis and annual inspections extend reliable operation.

Q5: Can the transformer be installed indoors?

Yes. It can be installed indoors where oil-containment and fire-protection provisions meet local codes; FR3 natural ester fluid is often preferred for indoor vaults.

Q6: Which standards and certifications apply?

Design and testing per IEC 60076 and GB 1094 as standard; IEEE, ANSI, DOE and CE compliance available per destination market. Complete test reports and certificates are provided with each shipment.

Q7: What is the typical lead time?

Standard ratings are typically produced within 25–35 days after drawing approval; customized units depend on configuration. An exact schedule is confirmed with every quotation.

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