110 kV 16 MVA Power Transformer

110kV 16 MVA Transformer Description:

The 16 MVA transformer is a three-phase, oil-immersed unit designed for high voltage applications. It features a high voltage rating of 110 kV and a low voltage rating of 20 kV, with a frequency of 50 Hz. The design and production comply with IEC and EU standards, making it suitable for the European market.

Climatic and Environmental Conditions:

• Mounting Location: Outdoor
• Air Temperature: Maximum +45ºC, Minimum -35ºC
• Relative Air Humidity at 20ºC: 100%
• Seismic Acceleration: 0.2 m/s²
• Wind Pressure: 70 daN/m²
• Maximum Solar Radiation: 1.3 kW/m²

Constructive Requirements:

• Magnetic Circuit Material: Cold-rolled silicon steel
• Winding Material: Copper
• Cooling Oil: Nynas
• Dielectric Loss Angle Tangent at 90ºC (cf. IEC 60247): < 0.5%
• Water Content in Oil (cf. EN 60814): < 10 ppm
• Breakdown Voltage at Industrial Frequency without Treatment (cf. EN 60156): > 70 kV
• tg δ Measuring Socket to IT Insulators: Yes
• Cooling Mode: ONAN

Protective Covers:

• Inner Surfaces of the Tank: Oil-resistant enamel
• External Transformer Surfaces: 1 primer layer + 2 paint layers
• Paint Layer Thickness: > 80 µm
• Adhesion: 1-2
• Assembly Components: Galvanized

Technical Characteristics:

• Voltage Conversion Ratio at Idle: 110/20 kV
• Nominal Power: 16/16 MVA
• Voltage Regulation: Load regulation on the 110 kV side – 19 steps: ± 9 x 1.78%
  • IT Voltage – Step 1: 127.62 kV
  • IT Voltage – Step 10: 110 kV
  • IT Voltage – Step 19: 92.378 kV
• Connection Group: Y o d-11
• Nominal Frequency: 50 Hz
• Efficiency Index: 99.64%
• No-Load Current at Un and fn: Max. 0.6%
• Short-Circuit Voltage at In, fn, and 75ºC Winding Temperature: 11%
• Minimum Voltage Applied at Industrial Frequency (50 Hz, 1 min):
  • Primary Winding: 185 rms kV
  • Secondary Winding: 50 eff kV
• Minimum Impulse Test Voltage, Full Wave 1.2/50 µs:
  • Primary Winding: 450 kV max
  • Secondary Winding: 125 kV max
• Insulation Temperature Class: A
• Maximum Overtemperature of the Windings: 60ºC
• Maximum Oil Overtemperature: 55ºC
• Minimum Creepage Distance of Insulators:
  • At 110 kV: 300 mm
  • At 20 kV: 600 mm
• Noise Level: 55 dB

Accessories:

• Magnetic Oil Level Indicator:

  • Switching contacts
  • Magnetic coupling
  • UV-resistant laminated glass visor
  • Minimum/maximum level signaling contacts

• Air Filter:

  • High-quality steel filter
  • Modular humidity and temperature sensor
  • Hygroscopic substance: Silica
  • Test button
  • LED indicators
  • Filter heating system

• On-Load Adjustment Switch:

  • 3-phase with 19 positions
  • Oil temperature range: -25ºC to +105ºC

• Overpressure Valve:

  • Aluminum coated with RAL 7033
  • Stainless steel

• Winding Temperature Indicator:

  • Resistive signal converter
  • 4 electrical contacts
  • Laminated glass with 100% UV filter
  • Source for 4-20 mA signal outputs

• Oil Temperature Gauge: Used in transformers, the oil temperature gauge monitors the temperature of the transformer oil, which is crucial for cooling and insulating. It provides real-time readings on a dial or digital display, helping prevent overheating and ensure the transformer operates within safe temperature limits.

• Plotter Switch Actuation Device: In transformers, this device controls the operation of the tap changer, which adjusts the voltage levels. It allows for precise switching between different tap positions to regulate voltage output. The device can be mechanical or electronic, ensuring accurate and efficient voltage control for stable transformer performance.