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In the global power distribution network, the transformer is an indispensable core component, which undertakes the task of voltage level conversion and ensures the efficient and safe transmission of electrical energy. Among all kinds of transformers, overhead transformers play a crucial role in the “last mile” of power supply. As a professional manufacturer of distribution transformers, Chuanli has always been committed to providing high-quality overhead transformer solutions.
This guide will comprehensively interpret overhead transformers to help you fully understand their value and application.
Overhead transformer is a distribution transformer specially designed for overhead power grid installation. It is usually installed on poles or simple steel supports, and is mainly used to reduce the voltage of medium voltage electricity in transmission lines to low voltage electricity to meet the needs of residential, commercial and small industrial users.
Chuanli‘s single-phase overhead transformer is a typical representative of this type, which adopts a compact structure design, integrates the core components such as iron core and winding into the sealed oil tank, and is equipped with lightning protection and insulation safety devices, which can adapt to various outdoor environmental conditions.
The working principle of pole-mounted transformer is based on the electromagnetic induction principle of transformer, and the core process is voltage conversion and power transmission. It can be divided into three key stages:
Electrical energy input: The medium-voltage electrical energy in the overhead transmission line is introduced into the primary winding of the transformer through the high-voltage lead and lightning arrester. The lightning arrester can effectively suppress lightning strikes and other overvoltages, protecting the transformer from damage.
Voltage conversion: The alternating current in the primary winding generates an alternating magnetic field in the iron core, and the secondary winding cuts the magnetic lines of force to induce an electromotive force. Through the reasonable design of the number of turns of the primary and secondary windings, the medium-voltage electric energy is stabilized and reduced to low-voltage electric power. For example, the single-phase overhead transformer of Chuanli can precisely convert 10kV voltage to 220V/ 380V for user use.
Electricity output: The low-voltage electricity converted is output through the secondary winding, and then distributed to various users through low-voltage overhead lines or cables to realize the final supply of electricity.
According to the number of phases, capacity, and application scenarios, overhead transformers can be divided into various types to meet different power supply requirements:
Single-phase overhead transformer: Small in size and light in weight, suitable for single-phase power supply scenarios in rural areas, residential communities, and small commercial outlets. The single-phase overhead transformer of Chuanli is widely used in the transformation of agricultural network due to its high efficiency and low energy consumption.
Three-phase overhead transformer: large capacity, stable output, suitable for small industrial and mining enterprises, shopping malls and large residential areas that need to drive three-phase motors and other equipment in three-phase power supply occasions.
Oil-immersed overhead transformer: The transformer oil is used as the insulation and cooling medium, with excellent heat dissipation performance, which is the most common type of overhead transformer. Chuanli products use high-quality transformer oil and sealed tank to ensure long-term stable operation.
Dry-type overhead transformer: The insulation medium is air or inert gas, the fire resistance is good, and it is suitable for urban core areas, high-rise buildings and other areas with high fire safety requirements.
Compared with other types of distribution transformers, overhead transformers have unique characteristics and obvious advantages, which are fully reflected in the products of Chuanli:
Space-saving installation: Installed on poles, does not occupy ground space, solves the problem of land occupation in urban and rural areas, especially suitable for areas with dense buildings and limited open space.
Fast deployment: The pole-mounted transformer structure is simple, the installation accessories are standardized, and Chuanli provides complete installation instructions, which can realize fast on-site installation and commissioning, and shorten the power supply cycle.
High operating efficiency: With high-quality silicon steel core and copper windings, the air-gap loss and load loss are significantly reduced, and the overhead transformer of Chuanli has reached the national level 1 energy efficiency standard, which helps reduce energy consumption in the power grid.
Strong environmental adaptability: Equipped with a waterproof, dustproof, anti-corrosion and anti-aging shell, it can operate stably in harsh environments such as high temperature, extreme cold, humidity and sandstorm. The products of Chuanli have passed strict environmental tests to ensure reliable performance in all regions.
Low maintenance cost: Simple structure and low failure rate, routine maintenance only needs to check the oil level, insulation and connection points regularly, the service life of Chuanli products is long, which effectively reduces the user’s later maintenance cost.
With the characteristics of flexible installation and reliable performance, overhead transformers are widely used in various power supply scenarios, and Chuanli products have accumulated rich application experience:
Rural power supply: Rural users are scattered and the regional span is large. Single-phase and small-capacity three-phase overhead transformers can achieve a wide coverage of power supply. Chuanli products have made important contributions to the upgrading of rural networks and poverty alleviation through power.
Urban residential areas: In densely populated residential areas, overhead transformers installed on columns save land resources while matching the low-voltage power consumption needs of residents’ household appliances.
Commercial services: Small supermarkets, restaurants, gas stations and other commercial outlets have small electricity demand and flexible site conditions, and overhead transformers can provide convenient and efficient power support.
Small industrial and mining enterprises: Small factories, workshops and other places usually need three-phase power supply, and medium-capacity three-phase overhead transformers can meet the power supply requirements of production equipment such as motors and machine tools.
Temporary power supply: For construction sites, emergency rescue and other temporary power supply needs, the fast installation characteristics of overhead transformers can realize fast power supply.
Choosing an appropriate overhead transformer requires comprehensive consideration of various factors to ensure it matches the actual power supply requirements. Combining with the professional experience of Chuanli, the following key points are put forward:
Clarify the power demand: Calculate the total power of the power-consuming equipment and determine the transformer capacity. It is generally recommended that the transformer capacity be 10% to 20% higher than the actual load to avoid overloading. For example, for a residential area with a total load of 80kW, an overhead transformer of 100kVA can be selected.
Determine the phase type: Single-phase overhead transformer is selected for single-phase power consumption scenarios such as rural households and small shops; Three-phase overhead transformers are selected for three-phase power consumption scenarios such as factories and shopping malls.
Consideration of environmental conditions: High temperature and high humidity areas need to pay attention to the heat dissipation and anti-moisture performance of transformers; Choose products with low-temperature resistance in cold regions; Dry-type overhead transformers should be used as a priority in high-risk fire areas.
Pay attention to the energy efficiency grade: Choose transformers that meet the national high energy efficiency standards (such as level 1 or level 2). Although the initial investment is slightly higher, the long-term energy-saving benefits are significant. The overhead transformers of Chuanli all meet the high energy efficiency requirements.
Verify the manufacturer’s qualifications: Choose manufacturers with complete production qualifications, mature technology, and perfect after-sales service, such as Chuanli. Such manufacturers can provide reliable product quality and professional technical support.
In the fierce market competition, Chuanli’s overhead transformers, especially the single-phase overhead transformer series, relying on its outstanding advantages, has won the trust of a large number of users:
Professional R&D and production: With a professional R&D team and advanced production lines, we conduct in-depth research on the structure, materials, and performance of overhead transformers, and can continuously launch products that meet market demand.
Strict quality control: From the purchase of raw materials to the factory, each link is strictly tested for quality, and key components such as iron cores, windings, and transformer oil are carefully selected to ensure that each transformer meets high-quality standards.
Customized solutions: According to the specific voltage level, capacity demand, environmental conditions and other factors of the user, provide personalized customized services, such as customized anti-corrosion transformers for coastal areas and customized low-temperature transformers for cold regions in the north.
Improve after-sales service: Provide one-stop services such as pre-sales consultation, in-sales installation guidance, and after-sales maintenance. The professional after-sales team will respond quickly and solve user problems in a timely manner to ensure the stable operation of the equipment.
Rich practical experience: The product has been widely used in rural power grids, urban distribution grids, and industrial and commercial fields across the country, and has passed the test of various harsh environments, with a good market reputation.
As an important part of the distribution system, overhead transformer (including pole-mounted transformer) is the key link connecting the medium-voltage power grid and the terminal user, and its performance directly affects the reliability and economy of power supply. With the acceleration of urban and rural power grid renovation and the continuous growth of electricity demand, the market demand for high-quality overhead transformers is increasing day by day.
As a professional manufacturer of distribution transformers, Chuanli has always adhered to the concept of quality first and user-oriented, and its overhead transformer products integrate the advantages of high efficiency, safety and durability. Whether it is rural power supply, urban residents’ power supply guarantee, or industrial and commercial power supply demand, Chuanli can provide suitable solutions.
Choosing Chuanli overhead transformer is to choose the reliable guarantee of stable operation of power system.
Q1: What is the purpose of an overhead transformer?
A1: Reduce the voltage of medium-voltage power in transmission lines and convert it into low-voltage power suitable for residential, commercial, and small industrial users.
Q2: Why are some transformers mounted on poles?
A2: In order to save floor space, it is suitable for densely built-up areas, and easy to install and deploy in areas with tight land such as rural areas and cities.
Q3: What is the difference between an overhead transformer and a pad-mounted transformer?
A3: Overhead type: installed on poles, saves space, suitable for scattered user scenarios;
Ground-buried: installed on the ground, large capacity, suitable for industrial parks and other areas with concentrated loads.
Q4: Are overhead transformers single-phase or three-phase?
A4: All of them. Single-phase is suitable for rural/residential areas; Three-phase is suitable for large-load scenes such as small factories and shopping malls.
Q5: How long does an overhead transformer last?
A5: The service life of Chuanli products is 15-20 years, depending on the use environment and maintenance.
Q6: Do overhead transformers require maintenance?
A6: Need. Regularly check the oil level, insulation, and connection points; Major overhauls are carried out every 3-5 years.
