630 kVA Oil Immersed Transformer

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<h2 class="heading2 ld-qc-heading3" id="630kVA_Oil_Immersed_Transformer" style="text-align:center !important;">630kVA Oil Immersed Transformer</h2>

<p class="paragraph1 ld-qc-paragraph1">The 630kVA oil immersed transformer adopts a sealed tank design and matches the capacity ceiling usually applied to oil filled units installed indoors in commercial buildings. Delivering 0.4kV from a 10kV supply, the oil type transformer serves the main low voltage distribution board of office towers, shopping centres, hospitals and industrial plants, and it is also a common choice for urban distribution substations in densely built areas.</p>

<p class="paragraph1 ld-qc-paragraph1">Two tank constructions are offered: a fully sealed corrugated oil tank that needs no conservator, and a flat top tank with bolt on plate radiators for higher load cycles. Both use a cold rolled silicon steel sheet core and high strength insulated windings, giving low losses, low noise and high reliability. The transformer is manufactured and tested to GB 1094 and GB/T 6451, and to IEC 60076 on request.</p>

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<h2 class="heading2 ld-qc-heading3" id="Technical_Specifications" style="text-align:center !important;">Technical Specifications</h2>

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<tr><td class="group" rowspan="8">Electrical</td><td class="label"><p class="paragraph1">Rated Capacity</p></td><td class="val"><p class="paragraph1">630kVA</p></td></tr>

<tr><td class="label"><p class="paragraph1">Voltage</p></td><td class="val"><p class="paragraph1">2.4-34.5 kV - 480/277V 400/230V 380/220V Customized</p></td></tr>

<tr><td class="label"><p class="paragraph1">Frequency</p></td><td class="val"><p class="paragraph1">50/60Hz</p></td></tr>

<tr><td class="label"><p class="paragraph1">Vector Group</p></td><td class="val"><p class="paragraph1">Dyn11, Yyn0, Dyn5 or customized</p></td></tr>

<tr><td class="label"><p class="paragraph1">H.V. Tap Changer</p></td><td class="val"><p class="paragraph1">&plusmn;2&times;2.5% HV taps or customized</p></td></tr>

<tr><td class="label"><p class="paragraph1">Efficiency</p></td><td class="val"><p class="paragraph1">As IEEE, DoE 2016, GB or Customized</p></td></tr>

<tr><td class="label"><p class="paragraph1">Impedance Voltage</p></td><td class="val"><p class="paragraph1">1.1-5.75%</p></td></tr>

<tr><td class="label"><p class="paragraph1">Cooling Method</p></td><td class="val"><p class="paragraph1">ONAN, ONAN/ONAF, KNAN, KNAN/KNAF</p></td></tr>

<tr><td class="group" rowspan="4">Physical &amp; Standards</td><td class="label"><p class="paragraph1">Total Weight</p></td><td class="val"><p class="paragraph1">3000 kg</p></td></tr>

<tr><td class="label"><p class="paragraph1">Outline Dimensions（L×W×H）</p></td><td class="val"><p class="paragraph1">2250 × 1350 × 2250 mm</p></td></tr>

<tr><td class="label"><p class="paragraph1">Standards/Certificate</p></td><td class="val"><p class="paragraph1">IEEE, UL, ISO, IEC, GB</p></td></tr>

<tr><td class="label"><p class="paragraph1">Altitude</p></td><td class="val"><p class="paragraph1">&le;1,000m, 1000&ndash;2000m, 2000&ndash;3000m, &gt;3000m</p></td></tr>

<tr><td class="group" rowspan="4">Material</td><td class="label"><p class="paragraph1">Transformer Oil</p></td><td class="val"><p class="paragraph1">Mineral Oil or FR3</p></td></tr>

<tr><td class="label"><p class="paragraph1">Winding Material</p></td><td class="val"><p class="paragraph1">Aluminum/Copper</p></td></tr>

<tr><td class="label"><p class="paragraph1">Core Material</p></td><td class="val"><p class="paragraph1">CRGO Silicon Steel / Amorphous Alloy</p></td></tr>

<tr><td class="label"><p class="paragraph1">Tank Material</p></td><td class="val"><p class="paragraph1">Mild Steel / Stainless Steel</p></td></tr>

</tbody>

</table>

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</div>

<section class="cw-block"><h2 class="cw-block__title" id="630kVA_Oil_Immersed_Transformer_Construction_3" style="text-align:center !important;">630kVA Oil Immersed Transformer Construction</h2>

<div class="cw-block__grid">

<figure class="cw-block__fig">

<img src="https://sc02.alicdn.com/kf/Hc624c054cf4647d8ad7bfca32773a699l.jpg" alt="630kVA Oil Immersed Transformer Construction">

</figure>

<div class="cw-block__items">

<div class="cw-block__item">

<h3 class="cw-block__part" id="1_CORE_2">1.CORE</h3>

<p class="cw-block__desc">It is located in the center of the active part and is made of stacked or wound cold-rolled grain-oriented silicon steel sheets to form a closed magnetic circuit. Joints are mitered at 45&deg; with clamps and a single point ground to minimize no-load losses and noise, and for safety reasons.</p>

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<h3 class="cw-block__part" id="2_LV_WINDING_2">2.LV WINDING</h3>

<p class="cw-block__desc">The winding, inner or outer, closest to the core limbs. Due to the high current on the 0.4 kV side, the windings are usually of the foil type (copper or aluminium). The axial distribution of ampere turns is uniform. The short circuit withstand capability is high.</p>

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<h3 class="cw-block__part" id="3_HV_WINDING_2">3.HV WINDING</h3>

<p class="cw-block__desc">The outer winding which is placed concentrically with the LV winding. The 10 kV side is a multilayer cylinder construction with insulation and oil ducts in between the layers. It is separated from the LV winding by composite oil-paper main insulation.</p>

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<h3 class="cw-block__part" id="4_TRANSFORMER_OIL_2">4.TRANSFORMER OIL</h3>

<p class="cw-block__desc">Fills the tank and immerses the active part. It has three functions: insulation (increasing the dielectric strength between windings and to ground), heat dissipation (removing heat to the tank walls by natural convection), and protection against moisture (isolating air to slow down aging of the insulation).</p>

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<div class="cw-block__item">

<h3 class="cw-block__part" id="5_CORRUGATED_TANK_2">5.CORRUGATED TANK</h3>

<p class="cw-block__desc">It is the transformer enclosure and the radiator also. The tank walls are corrugated. The corrugated panels are completely sealed so that they can elastically compensate the volume changes of the oil due to temperature variations. The oil does not touch the outside air and is therefore maintenance-free.</p>

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<div class="cw-block__item">

<h3 class="cw-block__part" id="6_HV_BUSHING_2">6.HV BUSHING</h3>

<p class="cw-block__desc">This is mounted on the tank cover and provides safe termination of the leads of the HV winding out of the tank. It provides 10 kV insulation to ground and mechanical support for cable or busbar connections.</p>

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<div class="cw-block__item">

<h3 class="cw-block__part" id="7_LV_BUSHING_2">7.LV BUSHING</h3>

<p class="cw-block__desc">It is mounted on the other side of the tank cover and brings out the three phase and neutral leads for the 0.4 kV side. It does the same insulation and lead out functions as the HV bushing but is smaller in size.</p>

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<h3 class="cw-block__part" id="8_TAP_CHANGER_2">8.TAP CHANGER</h3>

<p class="cw-block__desc">Off-circuit type, mounted on the tank cover operating mechanism and connected to the HV winding taps. It has a normal &plusmn;2&times;2.5% tap range and is manually set to the local voltage levels while de-energized.</p>

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</div></div></section>

<div class="tqc-head">

<h2 id="Transformer_Testing_Quality_Control_2" style="text-align:center !important;">Transformer Testing &amp; Quality Control</h2>

<p style="margin:16px auto 0 !important;max-width:680px;text-align:center !important;">Every transformer is tested before shipment according to applicable standards and customer requirements &mdash; from the first batch of raw material to the final routine test on the factory floor.</p>

</div>

<div class="tqc-cols">

<div class="tqc-media">

<figure>

<img src="https://inrorwxhommplj5m-static.micyjz.com/cloud/pkBpoKjkloSRmliimqpqkm/3-Design-Tests.png" alt="Oil-immersed transformers on our production floor">

</figure>

<figure>

<img src="https://inrorwxhommplj5m-static.micyjz.com/cloud/ppBpoKjkloSRmlikjjmikq/2-In-process-Testing.png" alt="On the in-process testing line">

</figure>

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<div>

<section class="qc-block">

<div class="qc-head"><span class="qc-no">01</span><h3 id="Raw_Material_Inspection_2">Raw Material Inspection</h3></div>

<p>Transformer quality begins with the materials we bring in. Every batch of incoming material is inspected against approved specifications before production, with supplier qualification and traceability records maintained for each shipment.</p>

</section>

<section class="qc-block">

<div class="qc-head"><span class="qc-no">02</span><h3 id="In-process_Inspection_2">In-process Inspection</h3></div>

<p>Progress tests are conducted at key stages of the manufacturing process to verify that every 630kVA three-phase oil-immersed transformer meets design and quality requirements before final assembly.</p>

</section>

<section class="qc-block">

<div class="qc-head"><span class="qc-no">03</span><h3 id="Routine_Tests_2">Routine Tests</h3></div>

<p>Before leaving the factory, each transformer undergoes routine testing &mdash; conducted in accordance with <b>GB 1094 / IEC 60076</b> standards &mdash; covering key parameters such as insulation resistance, winding DC resistance, voltage ratio and vector group, no-load loss and current, load loss and short-circuit impedance, and applied voltage withstand.</p>

<p>Upon successful completion of all tests, the unit is shipped with a factory test report and a certificate of conformity, ensuring that every delivered product meets its rated performance and safety specifications.</p>

</section>

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<div class="fec-cols-title"><h2 id="Transformer_Customization_2" style="text-align:center !important;">Transformer Customization</h2></div>

<div class="fec-cols"><div class="fec-copy">

<p>630kVA Oil Immersed Transformers are available with a range of configurable options to meet different electrical and environmental requirements. Customers can select the appropriate insulating medium, voltage configuration, protection devices and accessories according to their specific project conditions.</p>

<p>For projects with higher environmental and fire-safety requirements, ester-based insulating fluids such as FR3 can be selected as an alternative to conventional mineral oil. These fluids offer a higher fire point and good biodegradability, making them suitable for applications where environmental protection and installation safety are important considerations.</p>

<p>The transformer can also be equipped with suitable voltage regulation and protection solutions, including load switching devices, surge protection, fuses and temperature monitoring components. These options allow the transformer to be configured for different grid conditions, load characteristics and protection requirements.</p>

<p>From utility distribution and commercial facilities to industrial and renewable energy projects, flexible transformer configurations help customers achieve the required balance of electrical performance, operational safety and environmental compliance.</p></div><div class="fec-media">

<figure>

<img src="https://inrorwxhommplj5m-static.micyjz.com/cloud/poBpoKjkloSRplmkjimkkp/oil.jpg" alt="Transformer Customization">

</figure>

<figure>

<img src="https://inrorwxhommplj5m-static.micyjz.com/cloud/ppBpoKjkloSRplmkiljrkq/Mineral_Oil.jpg" alt="Oil Immersed Transformers custom">

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<div class="pk-head"><h2 id="Packaging_Shipping_2" style="text-align:center !important;">Packaging &amp; Shipping</h2></div>

<div class="pk-cols"><div class="pk-media">

<figure>

<img src="https://sc02.alicdn.com/kf/H06a6892914d54517a95e7932ca9a9671s.jpg" alt="Transformer secured on a pallet with protective packaging">

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<figure>

<img src="https://sc02.alicdn.com/kf/H829f56f10f2f4c9d9168976683535b12M.jpg" alt="Oil-immersed transformers secured inside a shipping container">

</figure></div><div class="pk-copy">

<p>We ensure every three-phase oil-immersed transformer is safely packed, securely transported, and ready for installation.</p>

<p><b>Secure Packaging:</b> Weather-resistant wooden crates or steel containers protect against moisture, vibration, and impact.</p>

<p><b>Complete Accessories:</b> Standard accessories are factory-installed and tested, while optional components are packed separately.</p>

<p><b>Reliable Transport:</b> Road, rail, or sea shipping is arranged according to project requirements.</p>

<p><b>Complete Documentation:</b> Test reports, certificates, manuals, and shipping documents are provided.</p>

<p><b>Installation Support:</b> Unpacking, installation, and commissioning guidance is available for smooth project delivery.</p></div></div>

<div class="faq-wrap">

<h2 class="heading2 ld-qc-heading3" id="FAQ_From_Customers" style="text-align:center !important;">FAQ From Customers</h2>

<div class="faq-item">

<h3 class="heading4 phoenix_h4">What is an oil-immersed transformer?</h3>

<p class="paragraph1 phoenix_p1">An oil-immersed transformer — also called a liquid-filled, oil-filled transformer — uses dielectric fluid to cool, insulate and lubricate its internal components. The most common fluids are mineral oil, FR3 natural ester and silicone. Common configurations include pad-mounted, pole-mounted and substation transformers.</p>

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<div class="faq-item">

<h3 class="heading4 phoenix_h4">What information do I need to specify a transformer?</h3>

<p class="paragraph1 phoenix_p1">The essential parameters for a quote or order:</p>

<ul class="faq-list">

<li>kVA rating (or load profile to size it)</li>

<li>Number of phases (single or three)</li>

<li>Primary (HV) voltage and secondary (LV) voltage</li>

<li>Connection type / vector group (e.g. Dyn11, Yyn0)</li>

<li>Cooling class (e.g. ONAN, KNAN, AN, AF)</li>

<li>Insulation type (liquid-filled or dry-type; oil type)</li>

<li>Standards compliance (IEEE/ANSI, IEC, UL, CSA, etc.)</li>

<li>BIL (basic insulation level) and impedance, where relevant</li>

<li>Enclosure / mounting (pole, pad, substation, indoor)</li>

<li>Accessories (tap changers, load break switches, bayonet fuses, monitoring)</li>

</ul>

</div>

<div class="faq-item">

<h3 class="heading4 phoenix_h4">What certifications does your company hold?</h3>

<p class="paragraph1 phoenix_p1">Our company holds a complete set of management-system, product and market-access certifications:</p>

<ul class="faq-list">

<li>ISO 9001 — quality management system</li>

<li>ISO 14001 — environmental management system</li>

<li>ISO 45001 — occupational health and safety management system</li>

<li>IEC 60076 test reports — power and distribution transformers tested in accordance with the relevant IEC 60076 series standards</li>

<li>UL certification — for the North American market</li>

<li>CSA certification — for the Canadian market</li>

<li>CE marking — for the European market</li>

<li>GB (China national standard) compliance — manufactured and type-tested to the applicable GB standards, with routine factory test reports</li>

</ul>

<p class="paragraph1 phoenix_p1">All transformers are designed and manufactured in accordance with the applicable international standards (IEC / IEEE-ANSI). The corresponding certificates, type-test reports and routine test reports can be provided for your project review on request.</p>

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