1600 kVA Compact Substation Transformer-33/0.4 kV | Ethiopia 2022

Substation transformers: safeguarding the power lifeline, driving endless possibilities!

01 General

1.1 Project Description

This 1600 kVA compact substation transformer was delivered to Ethiopia in 2022. It’s used in factories that manufacture electrical products. This prefabricated substation (also known as compact transformer) contains HV and LV switchgear panels with distribution transformer to provide comprehensive solution. This prefabricated substation is ease of transportation and ready to relocate, ready for installation and commissioning, compact and robust design, equipped with high quality HV and LV equipment, wide range of factory designed options, reliable and minimal maintenance.

The rated power of the compact substation transformer is 1600 kVA with ONAN cooling, 3 phase, the primary voltage is 33kV with ±2*2.5% tapping range(NLTC), the secondary voltage is 0.4kV, they formed a vector group of Dyn5.

1.2 Technical Specification

1600 kVA compact substation transformer specifications type and data sheet

1.3 Drawings

1600 kVA compact substation transformer diagram drawing and size.

02 Manufacturing

2.1 Core

The core is formed by stacking individual silicon steel sheets in a specific arrangement. This structure minimizes magnetic leakage and reduces energy losses. The geometry and material orientation of the core are optimized to ensure uniform magnetic flux density and to reduce local saturation. Minimizing air gaps enhances magnetic coupling, but small gaps are intentionally left to reduce mechanical vibration noise. The laminated core is tightly pressed and fixed with clamps to prevent deformation caused by electromagnetic forces during operation.

2.2 Winding

To prevent short circuits between the coils, high-temperature-resistant insulation materials such as epoxy resin or paper insulation are often employed. he ratio of turns between the primary and secondary windings determines the voltage ratio of the transformer. To prevent overheating, the coils are designed with effective heat dissipation channels, and some transformers use oil or air cooling systems to assist in cooling. The coils must withstand electromagnetic forces, especially during short circuits or large current fluctuations. Therefore, they are designed to have stable mechanical structures.

2.3 Tank

The box part adopts domestic leading technology and technology, the shell adopts aluminum-plated zinc steel plate, the frame adopts standard container material and production process, has good anti-corrosion performance to ensure 20 years of no rust, the inner sealing plate adopts aluminum alloy plate, the sandwich adopts fireproof insulation material, the box is installed with air conditioning and dehumidification device, the equipment is not affected by natural climate environment and external pollution. It can ensure normal operation in the harsh environment of -40℃ ~ +40℃.

2.4 Final Assembly

Frame: Weld frame and apply anti-corrosion treatment. Transformer: Hoist, secure, and check oil level or condition. High-Voltage Compartment: Install equipment, connect busbars and circuits. Low-Voltage Compartment: Install switchgear, busbars, and wiring. Control and Protection: Install protection devices and instruments. Outer Shell: Assemble shell, doors, ventilation, and sealing. Cables and Grounding: Complete wiring and grounding system.

03 Testing

1. Appearance inspection (Enclosure shape, Welding quality, Surface paint, Enclosure cleaning, Electroplated parts)

2. Assembly quality inspection (Fastener, Electrical components)

3. Wiring inspection (Main circuit, Secondary circuit)

4. Equipment inspection (Electrical equipment inspection, Transformer inspection)

5. Insulation clearance and creepage distance inspection (Electrical clearance of main circuit at low voltage side)

6. Mechanical operation test (Manual opening and closing operation of load switch, Manual opening and closing operation of grounding switch, Tripping operation with fuse, Misoperation prevention, Components)

7. Loop resistance measurement (Main circuit)

8. Insulation test (1min power frequency withstand voltage test)

04 Site And Summary

SCOTECH‘s compact substation transformers are designed with precision, durability, and efficiency in mind, delivering reliable performance for a wide range of applications. With advanced technology, robust construction, and customizable options, we are committed to meeting your energy needs while ensuring safety and sustainability. Choose our transformers for a smarter, more dependable power solution that drives your success.