Question 1

Are you a manufacturer or a trading company?

Accepted Answer

We are a professional manufacturer with our own production facilities and engineering team.

Question 2

What are your payment terms?

Accepted Answer

Our standard payment terms are 30% advance payment and 70% balance before shipment. We also accept at-sight L/C (Letter of Credit).

Question 3

Can this transformer be customized?

Accepted Answer

Yes. We can customize the transformer according to project requirements, including rated capacity, voltage level, frequency, vector group, winding material, loss level, impedance voltage, tank color, accessories, and installation method.

Question 4

What are the common capacity and voltage levels?

Accepted Answer

Common capacities include 30kVA, 50kVA, 100kVA, 200kVA, 315kVA, 500kVA, 630kVA, 800kVA, 1000kVA, 1250kVA, 1600kVA, and more. Common voltage ratings include 10kV/0.4kV, 11kV/0.4kV, 13.8kV/0.4kV, 20kV/0.4kV, 33kV/0.4kV, etc. Customized voltage designs are available.

Question 5

What is the frequency of the transformer?

Accepted Answer

The standard frequency is usually 50Hz, and 60Hz can also be customized according to the power grid requirements of different countries and regions. Customers can provide the required grid frequency before ordering.

Question 6

Can copper or aluminum be selected as the winding material?

Accepted Answer

Yes. The transformer can be made with copper windings or aluminum windings according to the customer's budget and technical requirements. Copper windings offer better conductivity and higher mechanical strength, while aluminum windings are more cost-effective.

Question 7

What certificates and standards does this product offer?

Accepted Answer

Products can be designed, manufactured, and tested to IEC, GB, or other required standards. Nameplates, factory test reports, data sheets, drawings, wiring diagrams, manuals, packing lists, CE, ISO, CNAS type test reports, and third party inspection reports are available upon request.

Question 8

What information is required when ordering an oil immersed transformer?

Accepted Answer

Customers usually need to provide rated capacity, voltage ratio, phase, frequency, vector group, winding material, operating environment, installation method, cooling method, loss level, impedance requirement, and required accessories. If customers are not sure about the exact parameters, we can also provide technical suggestions according to the project application.

Question 9

What accessories can be equipped with an oil immersed transformer?

Accepted Answer

Oil immersed transformers can be equipped with various accessories according to customer requirements, such as oil level gauge, thermometer, pressure relief valve, oil drain valve, grounding terminal, lifting device, rollers, nameplate, protective enclosure, oil conservator, gas relay, and off-circuit tap changer. The accessory configuration can be customized according to project requirements.

Question 10

What tests are performed before delivery?

Accepted Answer

Before delivery, oil immersed transformers are usually subject to routine tests, including voltage ratio test, winding resistance test, insulation resistance test, no-load loss test, load loss test, impedance voltage test, withstand voltage test, and appearance inspection. Type test reports or third-party inspection reports can also be provided according to project requirements.

Question 11

What are the lead times, packaging arrangements, and after-sales services?

Accepted Answer

The delivery time for standard products is usually 15-45 days, depending on order quantity and customization requirements. The products are usually packed with export-standard wooden cases, steel frames, or protective packaging. We can provide technical support, installation guidance, and after-sales service. The specific warranty period is subject to the contract agreement.

Question 12

Can the oil immersed transformer be used in high-temperature, cold, or high-altitude areas?

Accepted Answer

Yes. Oil immersed transformers can be customized for different operating environments. For example, heat dissipation can be improved for high-temperature areas, suitable transformer oil and sealing structures can be selected for cold regions, and insulation distance and temperature rise design can be optimized for high-altitude areas. The specific solution should be confirmed according to the environmental conditions of the project site.

Question 13

What regular maintenance is required for an oil immersed transformer?

Accepted Answer

Regular maintenance mainly includes checking the oil level, oil temperature, bushing surface, terminal connections, grounding device, sealing parts, and whether there is any oil leakage. The operating sound should also be checked regularly, and transformer oil testing and electrical performance inspection can be carried out according to actual operating conditions.

Question 14

What is the typical service life of an oil immersed transformer?

Accepted Answer

Under proper installation, reasonable load, regular maintenance, and a good operating environment, an oil immersed transformer can usually operate reliably for a long time. Its actual service life is affected by factors such as load rate, ambient temperature, insulation aging, oil condition, and maintenance quality.

Question 15

Can an oil immersed transformer operate at full load for a long time?

Accepted Answer

An oil immersed transformer can operate within its rated capacity, but long-term full-load or overload operation is not recommended. Continuous high-load operation may increase temperature rise, accelerate insulation aging, and affect service life. It is recommended to select the capacity properly according to actual load conditions and maintain good heat dissipation.

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