Three-phase oil distribution transformer 35 kV TM

The company’s S-35kV series oil-immersed transformer is suitable for three-phase AC with a frequency of 50/60Hz and a rated voltage of 35kV distribution networks, playing a vital role in high-voltage transmission and low-voltage power supply. These products, with their high efficiency and low loss characteristics, can significantly save energy and operating costs, while also delivering social benefits. They are widely used in power plants, substations, industrial and mining enterprises, ports, airports, and other environments.

With the load tap changer, the product can realize manual or automatic voltage regulation function without power failure, which helps stabilize the power grid voltage at each load center and improve the quality of power supply.

Standards

IEC60076-1:2011 Power transformers. Part 1. General information.

IEC60076-2:2011 Power Transformers. Part 2. Temperature Rise of Liquid-Filled Transformers.

IEC 60076-3:2013+AMD1:2018 Power transformers. Part 3. Insulation levels, dielectric tests, and external air clearances.

IEC 60076-5:2006 Power transformers. Part 5. Short-circuit withstand capability.

IEC 60076-10:2016 Power transformers. Part 10. Determination of sound levels.

Normal environmental conditions

• Ambient temperature: No more than +40℃, No less than -25℃, Average monthly temperature no more than +30℃, Average annual temperature no more than +20℃.
• Altitude: No more than 1000m.
• The power supply voltage waveform is similar to a sine wave.
• The voltage of a three-phase power supply is approximately symmetrical.
• The total harmonic content of the load current should not exceed 5% of the rated current;
• Installation location: Indoors or outdoors.

Product Characteristics

The core is made of cold-rolled silicon steel sheet with high magnetic conductivity and grain orientation, with low no-load losses.

The three-phase winding is a concentric coil with a corrugated oil channel. The dip-dip process is avoided, and the tape is tightly bound. It offers high mechanical strength, balanced current distribution, and high short-circuit resistance.

A positioning system has been added to the housing to prevent movement during transportation. All fasteners are equipped with locking nuts to prevent loosening during long-term use.
This product is a completely sealed design. Vacuum oil filling is used during transformer packaging, completely removing moisture from the transformer, isolating the transformer oil from the outside air, preventing oil aging, and improving transformer reliability. All transformers in the capacitive section are equipped with safety valves, and upon customer request, gas relays with alarm and tripping functions can be installed, ensuring safe operation of the transformers.

A corrugated oil tank is adopted. This type of oil tank offers advantages such as ease of processing, high mechanical strength, good welding properties, and no leakage. Moreover, the high fluidity of the oil improves the product’s heat dissipation capacity.

The product is attractive in appearance, compact in volume, and has a small footprint. It is an ideal product that requires no maintenance.