Product Introduction
SCOTECH delivered 6 units of 2.5 MVA 0.6/22KV step up transformers to South Africa in 2020, the rated power of the transformer is 2500 KVA, they are solar inverter power transformers to be used in PV farm, the primary voltage of the transformer is 0.6 KV and secondary is 22 KV. the primary terminals are plug-in type bushings(elbow type bushings) which allows easy connection for cables, the secondary terminals are high quality copper bus bars, all the terminals are mounted at the side of tank inside cable boxes, the transformers also equipped with oil temperature indicators (OTI) and winding temperature indicators (WTI) to supervise the temperature in oil and windings which makes safer operation. The transformers were designed as K factor 13 to withstand the harmonics, also able to withstand 0.5% of the fundamental current and 3% THD at nominal power, the conservator were painted white and the tanks were painted grey as customer’s demands, our step-up transformer was designed with advanced technology and adopts high quality material and components which result in reliable quality and long operation time.
SCOTECH ensure each one of our delivered transformers had passed the full acceptance test and we remains 0 fault rate record for more than 10 years so far, our oil immersed power transformer is designed in accordance with IEC, ANSI and other major international standards.
Scope of Supply
Product: Oil Immersed distribution Transformer
Rated Power: Up to 5000 KVA
Primary Voltage: Up to 35 KV
Technical Specification
2.5 MVA inverter transformer specification and some details.
| Delivered to | South Africa |
| Year | 2020 |
| Model | SL-2500KVA-0.6/22KV |
| Type | Oil Immersed Transformer |
| Standard | IEC60076 |
| Rated Power | 2500KVA |
| Frequency | 50 HZ |
| Phase | Three |
| Cooling Type | ONAN |
| Primary Voltage | 0.6 KV |
| Secondary Voltage | 22 KV |
| Winding Material | aluminum |
| Vector Group | Dyn11 |
| Impedance | 6% |
| Tap Changer | NLTC |
| Tapping Range | ±2*2.5%@ Primary Side |
| No Load Loss | 2.5 KW |
| On Load Loss | 33 KW |
| Accessories | OTI,WTI, cable boxes,etc |
General Arrangement Drawing
2.5 MVA 3 phase step up transformer wiring diagram
2.5 MVA 0.6/22KV Transformer Silicon Steel Sheet
The function of Silicon Steel Sheet
1、Low iron loss.
2、under the strong magnetic field magnetic induction intensity is high, which makes the motor and transformer core volume and weight decrease.
3、Smooth surface, flat and uniform thickness.
4、Good punching, for the manufacture of micro, small motor is more important.
5、The surface insulation film has good adhesion and weldability, which can prevent corrosion and improve the punching property.
6、Basically no magnetic aging.
Finished 2.5 MVA 0.6/22KV Transformer
2.5 MVA 0.6/22KV Transformer Testing
Type tests of transformer include:
1、Winding resistance test of transformer
2、Transformer ratio test
3、Transformer vector group test
4、Measurement of impedance voltage/short circuit impedance (principal tap) and load loss (Short circuit test)
5、Measurement of no-load loss and current (Open circuit test)
6、Measurement of insulation resistance
7、Dielectric tests of transformer
8、Temperature rise test of transformer
9、Tests on on-load tap-changer
10、Vacuum tests on tank and radiators
Packing and Delivery
Treatment of abnormal noise in transformer
1. Lighten the load
2. Check the supply voltage
3. Check the grounding lug and replace the damaged one
4. Tighten the iron core
5. Power failure repair
6. Clean or replace the bushing after power failure
Transformers waiting for installation at user’s site in South Africa
FAQ
1. What standard do you follow?
IEC 60076 standard, and all other major international standard such as ANSI, CSA, UL, etc.
2. What package do you have for transformers?
Standard package with welded iron frame packed with ply wood boxes.
3. How long can I receive my transformers?
The shipping time from our port (shanghai or Ningbo) to your port is range from one week to one month, depend on the distance.
