Driving power innovation with advanced technology-VPI Dry-Type Transformer makes electricity smarter.
01 General
1.1 Project Description
The 630 kVA opening winding dry type transformer was delivered to South Africa in 2024, the rated power of the transformer is 630 kVA. The primary voltage of the transformer is 11 kV and secondary voltage is 0.55 kV. We designed a 125 ° C temperature rise and H-class insulation, which can suffer 180 ° C max temperature, strong overload capacity, strong short-circuit resistance, high safety performance.
general electric dry type transformers produced by SCOTECH have low office discharge, low noise, strong overload capacity, strong short-circuit resistance, flame retardant, non-combustible and non-explosive characteristics, and high safety performance. Using multiple technologies, effectively suppress harmonic content, filter harmonics,and prolong motor life. It can effectively prevent moisture, salt spray, corrosion, weather resistance, long service life. Widely used in factory workshops, high-rise buildings, commercial centers, airports, docks, subways, oil platforms and other places of power transmission and transformation systems. Our 630kVA dry type transformer was designed with advanced technology and adopts high quality material and components which result in reliable quality and long operation time.
1.2 Technical Specification
630 kVA general electric dry type transformers specification and data sheet
| Delivered to | South Africa |
| Year | 2024 |
| Model | 630KVA-11/0.55KV |
| Type | Opening winding dry type transformer |
| Standard | IEC60076 |
| Rated Power | 630KVA |
| Frequency | 50HZ |
| Phase | 3 |
| Cooling Type | AN/AF |
| Primary Voltage | 11KV |
| Secondary Voltage | 0.55KV |
| Winding Material | Aluminum |
| Impedance | 6% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5%@primary side |
| No Load Loss | 1.1KW |
| On Load Loss | 8.3KW |
| Accessories | Standard Configuration |
| Insulation level | H |
| Basic impulse lighting withstand voltage-primary side (BIL) | 75KV |
| Power frequency withstand voltage-primary side | 35KV |
| Basic impulse lighting withstand voltage-secondary side (BIL) | / |
| Power frequency withstand voltage-secondary side | 3KV |
| Winding temperature rise @ rated service condition | 100K |
1.3 Drawings
630 kVA general electric dry type transformers diagram drawing and size.
02 Manufacturing
2.1 Core
| The core adopts high quality and high permeability silicon steel sheet, multi-step process, bass noise reduction, low no-load loss. The design of the iron core adopts the “E-I” type or “ring” structure. The E-I type can effectively reduce the flux leakage and eddy current loss by superimposing the E-shaped and I-shaped silicon steel sheets together to form a closed-loop magnetic circuit. The annular core further reduces energy loss through the annular design and provides a better flux path. Each sheet of silicon steel is insulated, usually with insulating paint or coated with insulating paper, which reduces the generation of eddy currents. The lamination process of the iron core superimposes the sheets into layers to ensure the permeability of the iron core while minimizing the hysteresis loss of the iron core. |  |
2.2 Winding
 | The winding adopts open and non-enveloped structure, which has good heat dissipation effect and strong overload capacity. The unique winding design can effectively reduce the electric field strength between the windings, thus reducing the risk of insulation breakdown. |
2.3 Final Assembly
| Winding placement: the primary winding and secondary winding are installed on the iron core according to the design requirements. Winding connection: Connect the winding terminal according to the electrical drawing to ensure the connection is stable. Insulation materials: Place the insulation materials (such as insulating paper and insulating oil) according to the design requirements to ensure the integrity of the insulation system. Insulation test: insulation resistance test is performed to ensure that the insulation system complies with technical specifications. Fans or coolers: Install the transformer’s fans or coolers to ensure that the cooling system can effectively dissipate heat. Shell fixation: Install the shell or guard of the transformer in place to ensure that the shell is sealed with the main body of the transformer. Cable connection: Connect the high and low voltage cables of the transformer to ensure that the electrical connection is strong and meets safety standards. Grounding: Perform grounding treatment to ensure that the grounding system of the transformer is good. |  |
03 Testing
| No. | Test Item | Unit | Acceptance Values | Measured Values | Conclusion | |
| 1 | Measurement of winding resistance | / | Maximum resistance unbalance rate Line resistance: ≤2% | HV (line) | LV (line) | Pass |
| 0.05% | 0.21% | |||||
| 2 | Measurement of voltage ratio and check of phase displacement | / | The tolerance of voltage ratio on the principal tapping: ±1/10 Connection symbol: Dyn11 | -0.01% ~ 0.13% Dyn11 | Pass | |
| 3 | Measurement of Short-circuit Impedance and Load Loss | / kW kW | t: 120℃ Z%: measured value Pk: measured value Pt: measured value | 6.04% 5.57 7.123 | Pass | |
| 4 | Measurement of No-load Loss and Current at 90% and 110% of rated voltage | / kW | I0 : provide measured value P0: provide measured value | 90% Ur | 110% Ur | Pass |
| 0.45% | 0.55% | |||||
| 0.981 | 1.199 | |||||
| 5 | Applied Voltage Test | / | HV: 35kV 60s LV: 3kV 60s | No collapse of the test voltage occurs | Pass | |
| 6 | Induced Voltage Withstand Test | / | Applied voltage (KV): 2 Ur Induced voltage (KV): 1.1 Duration(s): 40 Frequency (HZ): 150 | No collapse of the test voltage occurs | Pass | |
| 7 | Partial Discharge Test | pC | The maximum level of partial discharges shall be 10 pC | ＜10 | Pass | |
04 Packing and Shipping
05 Site And Summary
Thank you for your interest in VPI dry-type transformers! We are committed to providing efficient, safe, and reliable power solutions to meet the needs of various industries and applications. With exceptional performance, eco-friendly design, and long-term operational stability, general electric dry type transformers have become a trusted choice for our customers. We look forward to working with you to create a more efficient and sustainable future. For more product information or professional support, please feel free to contact us at any time!
