How to choose and install rural distribution transformers

In order to achieve the requirements of reasonable structure, economic operation, and convenient maintenance of distribution transformers, the selection of the installation location of rural distribution transformers is a key factor.

Pad-mounted Transformer

We can provide you single phase and three phase pad mounted transformer

Dry-type Transformer

Type:Cast resin; Rated Capacity: Up to 25MVA; Rated Voltage: Up to 36KV;

Pole Transformer

TypeCSP type Frequency: 50/60Hz; Rated Power: 5~167kva

Dry-type Transformer

Frequency: 50/60Hz Rated voltage:10kv, 20kv,30kv Rated Power: 400~2500kva

The Ultimate FAQ Guide

Selection of Rural Distribution Transformers

The installation location selection of the transformer

rural distribution transformers
rural distribution transformers

The actual characteristics of rural areas, lower conditions, population distribution, and other factors are important factors affecting the selection of rural distribution transformers.

Distribution transformers should be distributed according to the principle of small capacity and short radius. The distribution transformer needs to be located in the central load zone while avoiding being too close to densely populated places. The distribution transformer also needs to be installed in a dry place. In order to facilitate inspection and maintenance, choose the other party with flat terrain.

Summary: The installation location of the distribution transformer needs to be selected in a dry, flat, and close to the central load zone. This choice can effectively reduce line loss and improve voltage quality.

Selection Method of Distribution Power Transformer

Selection of distribution transformer model

Due to the slow renewal of equipment, the current distribution transformers in rural areas are generally of high-loss type. In order to save energy and protect the environment and improve the utilization rate, it is recommended to use S11 series distribution transformers and dry-type transformers.

This type of transformer adopts the core technology and design technology, which can achieve energy saving, low loss, and stable operation.


Selection of Rural Distribution Transformer Capacity

With the large investment in household appliances and agricultural equipment, people’s demand for electricity is increasing. Therefore, it is necessary to choose a large-capacity distribution transformer capacity.

The selection is based on the proportion of the electrical load that should account for 50% to 70% of the transformer capacity. It is recommended to choose between 30~315kVA. If the demand exceeds 315kVA, a distribution transformer should be added.

How To Choose The 10kv Transformer Capacity Grade

Installation of Rural Distribution Transformers

Installation method of pole transformer

Among the choices of rural distribution transformers, pole transformers have always been a popular choice due to their convenience.

The pole transformer can shorten the low-voltage power supply radius. The pole transformer needs to be installed on a cement pole of 12m~15m. Try to stay away from houses and crowded places. At the same time, select the appropriate branch line to install the distribution transformer.

Electric Pole Transformer | Single Phase Transforme

electrical pole transformer

Installation of bench-type distribution transformer

The distance between the platform and the ground is required to be at least 2.7m. At the same time, the horizontal slope should not be too large.

The distribution transformer needs to be installed in channel steel with two sleepers at the bottom to prevent the transformer from vibrating during operation. On the top of the distribution transformer oil tank, a steel strand with a suitable diameter is used to form a fixation between the two inductors.

In the installation of high-voltage pig heads for distribution transformers, a fake silicon cover is used. At the same time, heat-shrinkable insulating sleeves are used to insulate the exposed parts.

Set warning signs on the channel steel of the transformer, and standardize relevant data information on the warning signs.

bench-type distribution transformer
bench-type distribution transformer

Installation of fuses and switches

In the installation of distribution transformers, the installation of drop-out fuses and switches is very important. The vertical distance between the bottom of the fuse and the ground should be higher than 4.5m, and the horizontal distance should not be less than 0.5m.

The axis of the fuse forms an inclination angle of 15 to 30 degrees with the ground.

Due to the possibility of short-circuit phenomenon. When installing a 110kVA distribution transformer, the rated current of the high-fuse transformer should be controlled 1.5~2 times. For distribution transformers, less than 100 VA, the rated current of the high-voltage fuse should be selected by installing 2 to 3 times the capacitance.

Installation of lightning arrester

The main purpose of the lightning rod is to better prevent the distribution transformer from being cumulatively affected. Therefore, the installation position of the arrester needs to be optimized.

The lightning rod is mainly installed between the fuse and the transformer. At the same time, the arrester should be as close as possible to the transformer.

The lightning arrester should form a vertical position with the ground, and the bottom of the arrester should be installed on the angle steel cross arm.

Lightning rods should use metal oxide lightning rods with better protective insulation.

Down-lead installation

In the down-conductor installation of the newly built first-level transformation, it is necessary to have a multi-strand insulated wire pattern. Mainly can form the overall control of the transformer rated capacity.

In addition, the copper core plastic wire is used for the down conductor on the high voltage side to ensure the key control of the entire voltage transmission.

Consider the load increase requirements within 5-10a, and comprehensively strengthen the control of the cross-section.


For the installation of grounding equipment, a horizontal grounding body and a vertical grounding body are required. Especially when the grounding resistance has a large value, an effective resistance reduction method should be adopted.

In the specific installation of distribution transformers, the most suitable transformer should be selected according to the rural terrain and specific conditions. Daelim has fifteen years of design and production experience in the design and production of distribution transformers for rural areas. Daelim can produce suitable transformers for you according to your specific situation.

Custom Distribution Transformer

You may be confused why the distribution transformers on the market do not meet your requirements. Daelim can help you. We have a professional distribution transformer design team that can design and complete the design and production of distribution transformers within two weeks according to your requirements. And, to ensure the efficient and stable operation of customized distribution transformers.

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