1000kVA Transformer Station Contractor: Process, Construction and Services

1000kVA Transformer Station is a vital medium-capacity project in electrical systems. The construction process requires high technical skills to ensure safety and stability for the electrical grid.

Overview of the 1000kVA Transformer Station

The 1000kVA transformer station, also known as a medium-capacity transformer station, is often installed in industrial parks and large residential areas due to its ability to provide stable electricity distribution with a capacity of 1000 kiloVolt-Amperes. This station operates within a medium voltage range of 22kV to 35kV and low voltage of 0.4kV, meeting the specific requirements of each electrical system.

1. Main Structure of the 1000kVA Transformer Station

The 1000kVA transformer station is a crucial element in power distribution, consisting of the following components:

• 1000kVA Transformer:

• Uses silicon steel with a thickness of 0.3 – 0.5 mm as the core, enhancing magnetic conduction and reducing magnetic losses.

• The core is assembled from multiple thin steel sheets and electrically insulated to reduce eddy currents, thereby improving the efficiency of the electrical system.

• The windings are made from enamelled copper wire EI/AIW according to IEC 60851 standards, high heat resistance, ensuring durability and good resistance to transformer oil.

• Switchgear and Protection Devices:
  Includes devices that ensure the safe operation of the electrical system, prevent incidents such as overloads, and short circuits.

• Station Architecture:
  Integrates concrete bases, capacitor banks, grounding systems, and support structures. This not only provides system stability but also ensures safe electrical operation.

2. Basic Technical Specifications

The basic specifications that define the characteristics of the transformer station include:

| Specification | Value |
|————————————|———————————–|
| Capacity | 1000kVA |
| Input Voltage | 22kV (or 22 ± 2×2.5%) |
| Output Voltage | 0.4kV |
| Connection Group | Dyn11 / Yyn0 |
| Max No-load Loss (Po) | Approximately 980W |
| Max Short-circuit Loss (Pk) | Approximately 8550W |
| Max No-load Current (Io) | Approximately 1% rated current |
| Minimum Short-circuit Voltage (Uk) | Approximately 5% |
| Applicable Standards | TCVN 6306 (IEC 60076), Decision No. 62/QĐ – EVN |
| Quality Standards | ISO 9001:2015; ISO 14001:2015 |

3. Technical and Operational Features

The 1000kVA transformer is primarily a 3-phase oil-filled type with a sealed ONAN design, operating stably at a frequency of 50Hz. The optimized design of the steel core and windings not only reduces electrical losses but also enhances the stability of the power distribution system. The support of the capacitor bank system helps improve the overall power factor, ensuring more efficient operation.

4. Applications

The 1000kVA transformer station is commonly deployed in medium and small residential areas, small industrial zones, and moderate commercial centers. It is a crucial link in reducing voltage from the medium voltage system to a suitable level for electrical consumption devices.

5. Installation and Operational Requirements

The installation conditions of the transformer station require a solid concrete foundation, along with ventilation and exceptional moisture resistance. The switchgear must be regularly inspected and maintained to maintain protection efficiency and operational safety.

Main Construction Items of the 1000kVA Transformer Station Contractor

The 1000kVA transformer station contractor typically undertakes main items such as building grounding systems to ensure electrical safety, installing medium voltage lines to connect power sources, and arranging transformer equipment to step down voltage from medium to low voltage. Each item requires precision and high expertise in station construction.

During the 1000kVA transformer station construction process, contractors usually need to perform various processes, starting from site preparation to equipment installation and station operation check.

1. Building the Foundation of the Transformer Station

Building the transformer station foundation requires special attention to ensure stable operation of the 1000kVA transformer station. Initially, the construction site must be fully prepared with electricity, water, and materials such as sand, stone, and bricks that meet the standard. Then, excavation and foundation casting must comply with TCVN 4447-1987 standards to ensure a solid foundation.

2. Constructing Cable Pits and Excavating Trenches for Underground Cables

This is a crucial phase of electrical system construction, ensuring safety and stability for the cable system. This process includes excavating trenches for underground signal and power cables, carefully backfilling with sand and soil to protect the cable system.

3. Installing the 1000kVA Transformer

Installing the transformer is an important step requiring high technical skills and precision. The transformer is installed with a silicon steel core made from thin steel sheets to reduce electrical loss. The internal coils are made from enamelled copper to withstand heat and be durable according to IEC 60851 standards.

4. Installing Electrical Equipment and Protection Systems

The installation of electrical equipment and protection systems such as control cabinets, distribution cabinets is necessary for safe operation of the 1000kVA transformer station. Suitable switchgear and protection devices matching capacity and voltage standard are essential in this item.

5. Completion and Operational Testing

Finally, after installation completion, all cable systems and electrical equipment need to be fully connected and thoroughly checked. Trial runs help ensure the transformer station operates safely, efficiently, and without any technical issues during operation.

Construction Methods and Services of the 1000kVA Transformer Station Contractor

Contractors provide turnkey construction services from design consultation to installation and handover of the transformer station. Professional services include the installation of electrical systems, operational check, and maintenance. These services ensure the electrical system operates stably and safely, meeting all technical requirements of the investor.

Components of the 1000kVA Transformer Station

1. 3-phase 1000kVA Transformer is the key component ensuring efficiency and can operate at 1 or 2 medium voltage levels depending on the local grid.
2. Medium Voltage Switchgear and Protective Devices: Includes control and protection systems that can be pre-prepared or installed on site.
3. Low Voltage Switchgear and Protection using a 1600A low voltage circuit breaker and capacitor to optimize energy efficiency.
4. Station Architecture or Concrete Base: Can be an indoor station or set on a concrete base with supporting facilities such as grounding and medium voltage supply lines.
5. Low Voltage Cables: Always protected carefully in trenches with covers, ensuring safety and aesthetics.

Construction Process of the 1000kVA Transformer Station

• Preparation of Materials and Works: Good resource management through planning the supply of bricks, sand, stone, concrete, electrical equipment, and accompanying workforce.
• Survey and Build Foundation: Performed according to design drawings, adhering to technical standards such as TCVN4447-1987, ensuring on-site concrete pillars with high precision.
• Equipment Installation: From transformers, medium voltage switchgear to low voltage cabinets, capacitors, and low voltage cable connections, all must be carefully conducted to minimize risks.
• Testing and Trials: Each device will be thoroughly tested to confirm stable and safe operating capabilities.
• Powering and Handing Over: After confirming the system works correctly, powering and handover will proceed.

Technical Requirements and Construction Standards

Strict adherence to national technical standards, such as TCVN4447-1987, ensure the material quality and clean contamination-free concrete mixing water. Accurately report any arising issues, always prioritizing labor safety in each construction phase.

Services of the 1000kVA Transformer Station Contractor

• Design Transformer Station: Focusing on meeting the 1000kVA capacity requirement and local conditions.
• Turnkey Construction: Complete from foundation building to handover under a turnkey contract, saving time and effort for the investor.
• Supply Equipment and Materials: Fully provide transformers, electrical cabinets, switchgear, and capacitors needed.
• Maintenance and Repair Services: After-sales services ensure the transformer station operates long-term and stably over time.
• Technical Consulting and Operational Support: Users are guided in detail to optimize systems and solve any arising issues.

Standards and Quality of the 1000kVA Transformer Station Construction

Standards and Quality of the 1000kVA Transformer Station Construction

The construction of the 1000kVA transformer station must adhere to stringent technical standards such as the regulations of the Ministry of Industry and EVN. Selected materials and equipment must meet safety standards and ensure long-term durability. Strict supervision from site survey to acceptance of each item is essential to ensure progress and technical safety.

In the current context, building and operating a 1000kVA transformer station requires strict adherence to important technical standards, where TCVN 3715:82 serves as the foundation. This standard specifies requirements for packaged transformer stations operating at capacities up to 1000 kVA and voltages up to 20 kV.

Technical Requirements According to TCVN 3715:82

• Applicable Objects: Packaged transformer stations indoors or outdoors with a maximum capacity of 1000 kVA and a maximum voltage of 20 kV.
• Technical Requirements: Ensures electrical safety, mechanical durability, load capacity, and stable operating conditions.
• Application Limits: Not applicable for climates or hazardous gas conditions.

Structure Components and Transformer Materials

1. Transformer Core

The transformer core is an important component made from silicon steel with high magnetic guiding properties and good oxidation resistance. The design consists of thin steel sheets with a thickness of 0.3 to 0.5 mm, electrically insulated to reduce eddy current loss. Core material is typically imported from reputable manufacturers such as Nippon Steel Japan, fully meeting technical standards to ensure the 1000kVA transformer station’s efficient operation.

2. Transformer Windings

The transformer windings are indispensable, comprising primary and secondary coils of enamelled copper wire, meeting IEC 60851 and JSI C 3202-1994 standards. These coils ensure flexibility, good adhesion with the ability to withstand transformer oil and have high electrical durability.

Construction Quality

The construction of the 1000kVA transformer station requires strict adherence to standards concerning installation, testing, and electrical safety. Components need to be thoroughly checked for material quality and assembly accuracy, following TCVN 3715 standards. Moreover, insulation, grounding, surge protection, and overloading measures must ensure compliance with all safety standards for stable operation.

The 1000kVA transformer station contractor provides complete services from design, construction to maintenance, ensuring stability and safety for the electrical system. Choosing a professional contractor helps optimize efficiency and ensure sustainable development in industrial electrical investment.

To learn more about the 1000kVA transformer station construction and maintenance services, please contact QuangAnhcons via Hotline: +84 9 1975 8191.

QuangAnhcons provides turnkey construction services for the 1000kVA transformer station, ensuring processes from design consultation to post-construction maintenance, aiming at safety and efficiency for all power projects.