800 KVA transformer, 15 kV x 400 V three-phase

1. Product Description

The 800 KVA three-phase transformer with input voltages of 15 kV and output voltages of 400 V is an essential equipment for the conversion of electrical energy from medium voltage to low voltage. This transformer, which we will analyze as if it were used, is designed for industrial and commercial applications where it is necessary to transform high voltage energy into usable energy for low voltage equipment.

2. Materials and Components

• Nucleus:

  • Material: Laminated silicon steel, chosen for its excellent magnetic properties which reduce hysteresis and eddy current losses.
  • Construction: The core is composed of stacked thin steel sheets, fixed in such a way as to minimize energy losses and optimize the distribution of the magnetic field.

• Windings:

  • Material: Copper or aluminum, with copper generally preferred due to its higher conductivity.
  • Construction: The windings are wrapped around the core and designed to handle the flow of current and voltage with efficiency and safety.

• Insulation:

  • Material: Mineral oil or resin, depending on the type of transformer. Mineral oil is used for cooling and insulation, while resin is a more modern choice that offers more environmental protection.

• Cabin:

  • Structure: Robust metal, designed to protect internal components and ensure operational safety.

3. Dimensions and Weight

• Rated Power: 800 KVA
• Input Voltage (Medium Voltage): 15 kV
• Output Voltage (Low Voltage): 400 V
• Dimensions: Varies depending on the specific design, but in general, a transformer of this size can have a considerable footprint, often in the range of 1.5 x 2 x 2 metres.
• Weight: Generally between 2,000 and 3,000 kg, depending on materials and construction.

4. Mechanical Characteristics

• Efficiency: High, with reduced energy losses thanks to the use of silicon steel and high quality windings.
• Thermal Stability: The transformer is designed to operate at high temperatures, with cooling systems (such as oil or resin) preventing overheating.
• Insulation: Excellent, thanks to the use of high-quality insulation materials that protect against electrical discharges and external contamination.

5. Usage Procedure

1. Installation:
   • Place the transformer on a stable and level base.
   • Make sure the cabin is adequately ventilated and that the transformer is accessible for maintenance.
2. Connection:
   • Connect the high voltage cables to the medium voltage connections and the low voltage cables to the output connections.
   • Check that the connections are secure and that there are no signs of wear or damage.
3. Switching on:
   • Turn on the transformer and monitor operating parameters such as voltage, current and temperature.
   • Check for any signs of malfunction or anomalies.

6. Matching accessories

• Monitoring Devices: Sensors for measuring temperature and humidity, load indicators and warning systems.
• Cooling Systems: Additional fans or water cooling systems if used in hot environments.
• Protection Devices: Circuit breakers and fuses to protect the transformer from overloads and short circuits.

7. Mathematical formulas

• Apparent Power: S=P2+Q2S = \sqrt{P^2 + Q^2} $$S$$ $$=$$ P 2 + Q 2 ​Where PP $P$ is the active power and QQ $Q$ is the reactive power.
• Efficiency: Efficiency=Output PowerInput Power×100%\text{Efficiency} = \frac{\text{Output Power}}{\text{Input Power}} \times 100 \% $$\text{Efficiency}$$ $$=$$ Input Power Input Power Output × $$100\%$$
• Losses in the Core: Calculable through analysis of eddy currents and hysteresis losses.

8. Materials He Can Work with

• Resistive Loads: For example, electrical equipment that requires continuous power.
• Inductive Loads: Electric motors and other devices involving variable current flow.
• Capacitive Loads: It can also be used with capacitive loads, but it is important to check the specifications to avoid stability problems.

9. Maintenance

• Regular Inspection: Check oil level, condition of core and windings, and monitor for signs of wear.
• Cleaning: Keep the booth and its components clean and free of dust and debris.
• Safety Checks: Ensure that all protective devices and warning systems are functioning.

10. Verification of Good Used

• General Condition: Visually inspect the transformer for signs of damage, corrosion or wear. Check the state of the insulation and the absence of leaks.
• Functional Tests: Conduct functional tests to ensure that all parameters are within specified limits.
• Documentation: Check the maintenance documentation, the date of last inspection and the certifications of conformity.

11. Sectors of Use

• Industry: Used to power industrial machinery and equipment.
• Commercial: For applications in commercial buildings requiring reliable energy transformation.
• Public Sector: Used to provide energy to infrastructure and public services.

12. Advantages of Buying Used

• Lower Cost: Purchasing a used transformer can result in significant savings compared to purchasing a new one.
• Reliability: Well-maintained transformers can offer performance equal to that of new ones, especially if they have been used little.
• Immediate Availability: Used transformers are often available immediately, reducing waiting times.

In summary, the 800 KVA three-phase transformer, with input voltages of 15 kV and output voltages of 400 V, represents a robust and versatile solution for the transformation of electrical energy. With proper maintenance and testing, a used transformer of this type can offer excellent value and reliable performance for many industrial and commercial applications. If you have any other questions or need further details, I'm here to help