Oil Immersed Power Transformer 200kVA for Substation With Transformer Oil

Zisheng Electric Oil Immersed Power Transformer 200kVA for Substation can be fully customized to meet the specific needs of your projects. Voltage ratings can be tailored to suit different input and output requirements, ensuring compatibility with local grids or specialized industrial systems. We also offer various capacity options ranging from 50kVA to 500kVA, providing the flexibility to choose the ideal transformer size based on your power distribution needs. Whether you're looking for a high-efficiency transformer for renewable energy systems or a robust solution for industrial applications, our products can be adapted to suit diverse requirements.

Additionally, we offer customization in cooling methods, insulation materials, and tap changers, giving you the flexibility to select the most appropriate configuration for your environment. Our transformers come with a range of enclosure types, including weatherproof and explosion-proof options, for added durability and safety in challenging conditions. Custom transformer oil options are available as well, allowing you to choose environmentally friendly or high-performance oils that meet your specific safety and operational needs. With our expert engineering support, we ensure that every transformer is optimized to provide reliable, long-lasting performance.

The 200kVA oil immersed substation transformer is prepared with precision packaging to ensure safe global transport and minimal on-site work. The core-coil assembly is vacuum-dried and oil-impregnated in a controlled environment before tank sealing to maintain dielectric strength. Bushings, radiators, conservator, Buchholz relay, gauges, and accessories are factory-mounted where possible or crated separately with protective padding.
The unit is anchored on a heavy-duty reinforced wooden pallet or steel skid for forklift/crane handling, wrapped in volatile corrosion inhibitor (VCI) paper, multi-layer polyethylene sheeting, and secured with steel banding. Desiccant bags control humidity. Oil is shipped fully filled with nitrogen blanketing for positive pressure or partially filled with separate sealed drums to comply with hazardous material regulations and reduce weight (typical filled weight 3000–5000 kg / 6600–11000 lbs).
Export crating follows ISPM-15 heat-treated lumber standards, reinforced with steel strapping, edge protectors, and clear markings for weight, center of gravity, lift points (tank lugs), dimensions (approx. 2.8–3.5m L × 2.2–2.8m W × 2.8–3.4m H), and handling cautions (“High Voltage Equipment – Specialized Lifting Required”). Tamper-evident seals secure access; weatherproof covers protect bushings and compartments.
Domestic shipping uses flatbed trailers with secure blocking/strapping; oversize permits arranged when necessary. International transport options include 20ft/40ft open-top containers, flat-rack, or break-bulk/Ro-Ro ocean freight, with professional lashing using chains, turnbuckles, and timber dunnage to resist sea motion. Real-time GPS tracking and full-value cargo insurance provide end-to-end protection.
Upon arrival, detailed installation guides cover safe heavy-lift unloading (via tank lugs), foundation alignment, oil replenishment if partial, bushing/conservator connections, grounding, and pre-energization checks (insulation resistance, ratio, oil quality, DGA baseline). Customs documentation (commercial invoice, packing list, certificate of origin, test reports, efficiency certifications) facilitates clearance. Optional pre-shipment third-party or customer witness inspections add assurance. Coordinated logistics ensure regulatory compliance, minimal delays, and transformer arrival in factory-fresh condition ready for rapid substation commissioning.

Progress Test

The progress testing for the 220V to 110V oil-immersed power transformer (200kVA) involves multiple stages to ensure its performance and reliability. Key tests include visual inspection for any defects, electrical testing to check insulation and continuity, and load testing to verify the transformer's ability to handle full capacity. Additionally, dielectric and impulse tests confirm insulation integrity under electrical surges, while oil quality testing ensures optimal cooling and insulation properties. A temperature rise test ensures the transformer can operate safely without overheating. Finally, a comprehensive quality control inspection ensures the transformer meets industry standards and local regulations. These rigorous tests guarantee that the transformer is safe, reliable, and ready for deployment in substations, providing long-term, efficient operation.

Design Tests

All transformers will be tested after finishing the production, test items as follows:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Leak Test
♦ DC Insulation Resistance Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)

Transformer Factory Acceptance Test

The Transformer Factory Acceptance Test (FAT) ensures that the 220V to 110V oil-immersed power transformer (200kVA) meets all technical and safety standards before shipment. The FAT includes visual and dimensional inspections, electrical tests (insulation resistance, winding resistance), and no-load/full-load tests to verify performance. High-voltage and impulse tests assess the transformer’s dielectric strength, while a temperature rise test ensures safe operation under load. Oil testing checks the dielectric strength, moisture content, and chemical properties of the transformer oil. Finally, a comprehensive quality check confirms that the transformer meets all design and regulatory requirements. Upon successful completion, a detailed report is provided, assuring the customer that the transformer is ready for safe and efficient operation.

Routine Test - Leak Test

Purpose of Testing

The purpose of water leakage test is to check whether there is leakage in the equipment or system, to ensure that it has good sealing and safety during use. The integrity of the equipment can be verified by simulating the pressure or load conditions in the working environment.

Testing Equipment

Leakage current tester (e.g. Fluke, Hioki, Megger, etc.)
Voltage source (usually 500V, 1 KV or 2.5 KV, customized according to test requirements)
Temperature and humidity meter
Ground electrode

Pre-Test Preparation

Ensure that the test environment conditions are suitable for leak testing. Test between 20°C and 30°C. Relative humidity should be less than 75% to avoid moisture affecting the test equipment and results.

Test Progress

Connect the Test Instrument:
Properly connect the test equipment (such as a leak detector) to the pipe, container or sealing structure of the device under test.
Apply Test Voltage:
Apply the appropriate test pressure (e.g. 10 bar, 15 bar, etc.) depending on the equipment's operating pressure or test standard.

Measure and Record

Start the test and record the following parameters:
Applied test pressure
Leakage (can be monitored by flow meter or other equipment)
Time record (to ensure that the test time meets the standard requirements)
Initial pressure and final pressure (if any changes)

Check for leaks

Check for leaks on equipment surfaces and joints by using a foam detector, gas leak detector, or other suitable method.

Repeat Testing (if necessary)

If the test finds leakage or there is any doubt, repeat the test as necessary to verify the sealing of different locations or different equipment parts.

Evaluation Criteria (Reference)

No leakage (excellent): No leakage during the test, the equipment is completely sealed.
Minor leakage (good): Very small leakage is allowed, and it is necessary to judge whether it is qualified according to industry standards.

*These comprehensive tests ensure that each transformer meets performance standards and operates reliably under various conditions.

Essential for utility substations, industrial plants, and commercial facilities requiring reliable voltage transformation at 33kV/11kV to 0.4kV/0.48kV levels. Also suits generator step-up/step-down applications, renewable energy tie-ins, and mining sites needing stable power delivery and overload tolerance in high-demand environments.

Renewable Energy

Power & Energy Industry

Transport Sector