Industrial-Grade Power Stability
The 500 kVA Oil Immersed Transformer serves as the backbone for medium-scale industrial operations and critical infrastructure. Unlike smaller units designed for residential loads, this transformer is engineered to sustain the rigorous duty cycles of factory floors, handling heavy motor start-ups and variable inductive loads with exceptional stability.
We understand that reliability is paramount at this capacity. Therefore, every 500 kva transformer we manufacture undergoes a rigorous "heat run test" (Temperature Rise Test) simulation. This ensures that even under full load conditions at high ambient temperatures (up to 40°C or 50°C), the internal windings remain within the strict IEC 60076 temperature limits (Top Oil: 60K, Winding: 65K).
Superior Thermal Management
The longevity of an oil immersed system is directly linked to its cooling efficiency. For the 500 kVA model, we utilize an optimized corrugated fin configuration with increased surface area depth.
- Fluid Dynamics: The tank design promotes a natural thermosiphon effect, accelerating the circulation of the insulating oil. This rapid flow efficiently transfers heat from the active core to the tank walls.
- Corrosion Resistance: The cooling fins are not just functional; they are coated with C5-class anti-corrosion paint, making the unit suitable for harsh outdoor environments where humidity or industrial pollution might degrade lesser equipment.
Dial-type oil temperature indicator on 500 kVA transformer for
thermal monitoring.
Protection and Safety Features
As capacity increases, so does the need for protection. The 500 kVA unit is designed to accommodate advanced monitoring devices that are often optional on smaller sizes:
1. Pressure Relief Device: Equipped with a distinct pressure relief valve (PRV) that can be fitted with alarm contacts to trip the upstream breaker in case of internal pressure surges.
2. Gas Actuated Relay (Buchholz) Ready: The tank cover is designed with the necessary flange to accept a Buchholz relay (optional upon request), providing double-layer protection against gas accumulation and oil flow surges.
Technical Data
|
Parameter |
Specification Data |
|
Rated Power |
500 kVA |
|
Primary Voltage |
6.3kV / 11kV / 33kV |
|
Secondary Voltage |
400V / 415V (Line-to-Line) |
|
Impedance Voltage |
4.0% or 4.5% (Selectable) |
|
Cooling Type |
ONAN |
|
Winding Material |
Electrolytic Copper or EC Grade Aluminum |
|
Insulation Class |
Class A (105°C) |
|
Vector Group |
Dyn11 |
Ideal Application Scenarios
This robust 500 kva transformer is specifically tailored for:
- Manufacturing Plants: Supplying 400V power to assembly lines, injection molding machines, and compressors.
- Mining Operations: Providing reliable auxiliary power for ventilation and lighting in surface mining sites.
- Hospital Backups: Functioning as an isolation transformer for critical backup generators.
500 kVA oil immersed transformer powering a heavy industrial
manufacturing plant.
FAQ
Q1: Can the transformer be customized for different primary voltages?
Yes. We support primary voltage configurations of 6.3kV, 11kV, 22kV, and 33kV as standard options. Custom voltage levels within the 6kV–35kV range are available upon request. Please specify your local grid voltage when submitting an inquiry.
Q2: What is the standard delivery lead time for the 500 kVA unit?
For standard configurations (Dyn11, ONAN, copper winding), the typical lead time is 4–6 weeks after order confirmation and receipt of advance payment. Expedited production may be available depending on current workshop capacity - contact us for the latest schedule.
Q3: Is the Buchholz relay included as standard, or is it an optional add-on?
The Buchholz relay is offered as an optional add-on. The tank cover is pre-fitted with the required flange, so installation is straightforward and can be completed either at our factory before shipment or on-site by a qualified engineer. We recommend including it for installations in unmanned substations or critical facilities.
Q4: What winding material do you recommend - copper or aluminum?
For most industrial applications, we recommend electrolytic copper windings. Copper offers lower resistive losses, a higher current density, and better long-term reliability under repeated thermal cycling. EC-grade aluminum windings are available as a cost-reducing alternative where budget is the primary constraint, though the finished unit will be slightly larger and heavier.
Q5: Does the transformer comply with international standards, and can you provide test reports?
Yes. All 500 kVA units are designed and tested in accordance with IEC 60076. Standard factory test reports (routine tests including voltage ratio, insulation resistance, load loss, and no-load loss measurements) are provided with every shipment. Full type test reports are available upon request for large orders or project tendering requirements.
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