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Product Introduction
The 750kVA dry type transformer is commonly selected for indoor distribution systems where medium-capacity power supply is required for industrial and commercial facilities. Typical applications include manufacturing plants, office buildings, hospitals, data centers and other projects with dedicated electrical rooms.
In many installations, the transformer capacity is determined by more than the present power demand. Equipment characteristics, operating schedules, future load expansion and available installation space are also reviewed during the selection stage.
Using epoxy resin cast insulation instead of liquid insulation, this transformer avoids the oil leakage concerns normally associated with oil immersed units. The solid insulation structure also reduces routine maintenance work related to oil inspection and replacement.
For a 750kVA dry type transformer, electrical parameters such as voltage ratio, frequency, impedance voltage and connection group need to be confirmed before production. These details directly affect winding design, temperature performance and compatibility with the customer's distribution network.
Engineering Design and Main Features
Transformer performance depends on the coordination between the magnetic circuit, winding arrangement and insulation system.
Grain-oriented silicon steel sheets are used for the core assembly. During manufacturing, the cutting process and stacking condition are carefully controlled because the core quality has a direct influence on no-load loss, operating efficiency and acoustic performance.
The winding section adopts oxygen-free copper conductors. Compared with ordinary conductor materials, copper with stable conductivity helps maintain current transmission performance under continuous loading conditions. The winding structure is also designed with consideration of mechanical strength during short-circuit conditions.
A vacuum epoxy resin casting process is applied after coil production. Instead of simply covering the winding surface, the resin penetrates insulation gaps and forms a compact solid structure after curing. Control of vacuum pressure, resin condition and curing temperature is important during this stage.
For applications requiring operating condition monitoring, PT100 temperature sensors can be installed on winding phases. Temperature data collected during operation can help maintenance personnel identify abnormal temperature changes at an early stage.
Applications and Installation Conditions
Factories with production equipment are one of the common application areas for this capacity range. In such projects, engineers usually pay attention to motor starting current, load fluctuation and the influence of power electronic equipment.
Commercial buildings and public facilities often have different priorities. Limited electrical room space, ventilation arrangement, noise requirements and fire protection regulations may influence the final installation plan.
Hospitals and data centers require stable electrical operation because many connected systems cannot tolerate unexpected interruptions. Transformer selection is therefore considered together with the overall power distribution design.
Environmental conditions should not be overlooked during project planning. Temperature, humidity, altitude and pollution level may affect insulation coordination and cooling performance, especially in coastal regions or industrial areas.
Manufacturing Process and Quality Inspection
Production begins with incoming material inspection. Silicon steel sheets, copper conductors, epoxy resin compounds and insulation materials are checked before entering the workshop.
After material approval, the manufacturing process continues with core assembly, coil production, insulation treatment and final assembly. Each stage has its own control requirements because electrical performance depends on the accuracy of multiple production steps.
Vacuum casting is a critical part of dry type transformer manufacturing. Technicians monitor resin temperature, vacuum conditions and curing time during the process to maintain insulation consistency throughout the winding structure.
Before shipment, finished transformers undergo factory testing. Standard inspection items include insulation resistance, winding resistance, voltage ratio, dielectric withstand and temperature rise tests.
Test results are recorded together with production documents for quality tracking and customer review.
Technical Specifications
|
Item |
Description |
|
Product Type |
Dry Type Distribution Transformer |
|
Rated Capacity |
750kVA |
|
Phase |
Three Phase |
|
Frequency |
50Hz / 60Hz |
|
Primary Voltage |
Customized |
|
Secondary Voltage |
Customized |
|
Insulation System |
Epoxy Resin Cast Insulation |
|
Cooling Method |
Air Natural Cooling (AN) |
|
Core Material |
Grain-Oriented Silicon Steel |
|
Winding Material |
Oxygen-Free Copper |
|
Insulation Class |
F / H Class |
|
Temperature Monitoring |
PT100 Sensors |
|
Applicable Standard |
IEC 60076 |
Additional electrical parameters, including impedance voltage, vector group and enclosure requirements, are evaluated based on project conditions.
Production Control and Technical Support
Quality management is carried out throughout the production process rather than only at the final inspection stage.
Material checking, process supervision and electrical testing are combined to maintain consistency between different transformer units. Particular attention is given to insulation quality, assembly accuracy and test results.
For international projects, customers may require technical files before installation or approval. EC INSULATOR can prepare specifications, drawings, test records and other related documents for engineering review.
Communication during the project mainly focuses on confirming technical details, avoiding differences between the initial design information and the final supplied equipment.
Frequently Asked Questions
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