In countries with vast territories, scattered populations, remote settlements, and single environmental buildings, pole-mounted transformers can make the process much easier to better popularize power supply across the region. As a type of distribution transformer, pole-mounted transformers can better serve more remote areas because they do not need to install large transformers or power stations on the ground, but are more conveniently installed on poles, reducing the length of low-voltage distribution lines, reducing line losses, improving power supply quality, and delivering electricity to families or facilities.
Structure of pole-mounted transformer
1. Cylindrical appearance oil tank to increase operational reliability. One (or two) voltage regulating bushings are led out from the box cover, and the bushings contain current limiting fuses. One (or two) lightning arresters are installed on the box wall, with the top close to the high-voltage bushing outlet, connected with copper strips. It is equipped with a secondary circuit breaker, which is installed in the box. The box wall is equipped with an external operating handle, overload reset and signal light. The low-voltage bushing is led out from the box wall, X2 is equipped with a grounding device, and the single-tube high-voltage winding is led out through the high-voltage bushing at one end and grounded at the other end. This is the basic structure of the pole-type transformer.
2. The high-voltage bushing is an important part of the pole-type transformer. The high-voltage winding is wound on the iron core and isolated from the low-voltage winding. It is generally made of insulating material and needs to have high voltage resistance and insulation performance. The low-voltage bushing is also an important part. It mainly winds the low-voltage winding on the iron core and isolates it from the high-voltage winding. It is also made of insulating material.
3. The iron core and winding are each fastened. The fastening parts such as the height of the device and the low-voltage lead are equipped with self-locking anti-loosening nuts. The non-hanging core structure is adopted to withstand the vibration of transportation. The coil and the iron core are vacuum dried, and the transformer oil adopts vacuum oil filtration and oil injection technology to minimize the moisture inside the transformer.
4. The oil tank uses corrugated sheets, which have a breathing function to compensate for the volume change of oil caused by temperature changes, so this product has no oil storage cabinet, which obviously reduces the height of the transformer.
Since the corrugated sheet replaces the oil storage cabinet, the transformer oil is isolated from the outside world, which effectively prevents the entry of oxygen and moisture and causes the decline of insulation performance.
Two different connection types of pole-type single-phase transformers
Single-phase star transformers usually have only one bushing on the top, which is connected to one of the three primary phases. The other end of the primary winding is connected to the transformer casing, which is connected to the neutral line of the star system and grounded.
Single-phase delta transformers have two bushings connected to two of the three primary wires, so the primary winding is subject to phase-to-phase voltage; this can avoid the primary current returning through the neutral line, and the neutral line must be firmly grounded to make its voltage close to the ground potential.
Features of single-phase pole transformers
1. Higher power density: The cylindrical main upper transformer adopts a new structural design and manufacturing process to achieve a more compact size and higher power density.
2. Compact structure: Compared with traditional transformers, cylindrical main transformers are more compact in structure, occupy less space, and are easy to install and maintain.
3. Low noise: The cylindrical transformer structure can reduce the vibration and noise of the transformer.
4. High-voltage side output: The transformer outputs on the high-voltage side, and does not require the installation of complex wiring devices, making installation easier.
Application of single-phase pole transformers
The transformer adopts an efficient and energy-saving rolled iron core structure design, adopts a pole-mounted hanging installation method, has a small size, small infrastructure investment, reduces the low-voltage power supply radius, and can reduce low-voltage line losses by more than 60%.
It is suitable for rural power grids, remote mountainous areas, scattered villages, agricultural production, lighting and power electricity, and can also be used for railways and urban power grids to transform pole-mounted distribution lines for energy conservation.
In California, the use of pole transformers is very common. These transformers are usually installed on the top of poles to transmit electricity to homes, commercial buildings and other facilities. Both urban and rural areas here rely on these transformers to distribute and manage power supply.
These pole transformers play a critical role in California's electrical infrastructure, converting electricity from high-voltage transmission lines to low-voltage electricity suitable for use in homes and buildings. This conversion allows electricity to flow safely and efficiently into our daily lives and work, providing convenience for our lives.
