Power Transformer
Why choose us
Our Products
We mainly produce a variety of transformers, including oil-immersed power transformers, dry-type power transformers, oil-immersed three-dimensional coiled transformers, and dry-type three-dimensional coiled transformers. Additionally, we offer mining explosion-proof dry-type transformers, as well as high and low voltage switchgear and other equipment for power transmission and distribution.
Our Company
Jinshan Gate Technology Co., LTD. (referred to as Jinshan Gate) is located at No. 795 Nanming Road, Shuige Industrial Park, Liandu District, Lishui City. Our factory covers 208 acres and employs over 500 people. We hold more than 20 patents and combine advanced domestic and international technologies to become a key player in the transformer industry.
Product Application
Our products are widely used in power and railway sectors. With complete testing equipment and strict quality checks, we ensure that our products are stable and reliable over time. This has made our products highly valued by the power sector and various users. We export to many regions, including Southeast Asia, the Middle East, and Africa.
Our Certificates
Our products have received ISO9001:2008 international quality system certification and have been approved by the National Electrical Product Quality Supervision and Inspection Center. They meet IEC and national standards and have obtained various relevant certifications, including production licenses and national safety marks.
What is Power Transformer
A power transformer is a static electrical device. It transfers electric power between circuits. It doesn’t require any moving parts since it leverages electromagnetic induction. It utilizes the principle of electromagnetic induction to efficiently alter voltage levels for power transmission or distribution purposes. It consists of two or more coils of wire linked by a common magnetic core.
Benefits of Power Transformer
Simple Working Principle
A transformer’s working principle is simple to understand. They essentially consist of a winding, two windings, or more windings with different numbers of turns around a magnetic core. Step-up and step-down transformers are made possible by varying the number of turns across one winding. The transformer is one of the easiest electrical components to understand.
Multiply Electrical Tapping Points
Different voltage levels can be drawn from multiple tapping points on some transformers. A circuit that includes components that operate at different voltage levels can benefit from this. Electrical tapping points are typically based on the incoming supply voltage or the primary winding voltage. Hence it is possible to adjust the voltage level for other components on a 230V primary winding by tapping points of 220V, 210V, and 100V.
The Cost Of Transformers Is Relatively Low
Voltage transmission, distribution, and electrical isolation are all carried out by transformers, which are relatively inexpensive components. Small transformers integrated into electrical circuits are low-cost components. However, transformers that are larger and used for electrical distribution are more expensive. This is the biggest pro of electrical transformers.
Step up or Step down Voltage
In electrical distribution systems, transformers are extremely important because they can step down high voltage levels at substations so voltage can be supplied to houses at a safe level. Transformers make it very easy to operate different components of a circuit with varying voltage levels.
Possible to Connect In Reverse
It is possible to use some transformers in two different ways. Some transformers can be reverse-connected, so they can be used as step-down or step-up transformers. You can always verify this information by asking the electrical transformer or, in some cases, by reviewing the supporting documentation.
There Are No Moving Parts In Transformers
Electromagnetic induction transfers energy across the windings of transformers without any moving mechanical parts. Generally in machinery or electrical circuits, transformers typically feature no moving parts that can wear out over time and require little maintenance.
Power transformers are used for several reasons in the electrical power system. Some of them are:
To reduce power loss in transmission lines
Electrical power is generated at low voltage levels, which results in high current and high line losses due to ohmic heating. By using a step-up transformer at the generating station, the voltage level can be increased, and the current can be reduced, which reduces the line losses and improves the power factor. Similarly, at the receiving end, a step-down transformer can be used to lower the voltage level to a suitable value for distribution and consumption.
Galvanic Isolation Provided
Power transformers ensure electrical isolation between circuits with different potentials or frequencies. This protection prevents short circuits, ground faults, and equipment damage due to electrical interference.
Impedance Matching
By adjusting voltage and current levels, power transformers match the load impedance with the source impedance, enhancing power transfer and circuit efficiency.
Voltage Level Adjustment
Power transformers supply various voltage levels suited for diverse applications—lighting, heating, and communication. For instance, a three-phase transformer can deliver both three-phase power for industry and single-phase for home use.
Types of Power Transformer
Step-up and step-down Transformers
These transformers alter the voltage of an AC supply. A step-up transformer increases voltage with many more turns in the secondary winding than in the main winding. Alternatively, a step-down transformer decreases voltage with fewer turns in the secondary winding compared to the main winding.
Single-phase and Three-phase Transformers
Single-phase transformers, which have one primary and one secondary winding, are used for single-phase AC supplies. Three-phase transformers, which are used for three-phase AC supplies, have three primary windings and three secondary windings hooked up in a star or delta configuration. These are ideal for manufacturing uses and big power systems.
Two-winding and Autotransformers
Two-winding transformers have different primary and secondary windings, perfect for excessive voltage ratios (greater than two). Autotransformers, with individual winding serving both secondary and primary circuits, are more effective for lower voltage ratios (less than two) and economical for many uses.
Distribution and Power Transformers
Distribution transformers step down voltage for regional distribution to businesses and homes, operating close to total load with effective voltage regulation. Power transformers, utilised in transmission networks to step up and step down voltage between generating substations and stations, handle varying voltages and big power transfers.
Instrument Transformers
These are special transformers employed for measuring high currents and voltages. These transformers reduce higher currents to a lower, measurable value, while prospective transformers (PT) reduce higher voltages for measurement by standard instruments, ensuring accuracy and safety.
Oil-cooled and Dry type Transformers
Oil-cooled transformers work with mineral oil for cooling spreading through radiators or heat exchangers, which is ideal for high-power applications. Dry-type transformers utilise air for cooling, facilitated by fans or vents, and are generally used inside or perhaps in locations where fire safety is an issue.
Efficiently transfers the electrical energy
Power Transformers are highly important for an electrical power system. They are helpful in the efficient and safe transmission of power, which helps reduce power loss. Especially when the power transformers transfer energy over long distances, some energy gets lost in the process. But with the help of a power transformer, it is possible to reduce this loss. It is done by regulating the voltage of the electrical energy for efficient transmission.
Suitable for multiple industrial and commercial applications
Power Transformers greatly help in industrial and commercial applications. It is useful for power generation, transmission, and distribution to long distances. Power transformers are also helpful in stepping down the voltage to the required level in commercial buildings to function elevators, HVAC systems, and other equipment. It is used in oil and gas production, extraction, and refining. Power transformers are best suited for solar farms, windmills, and other renewable energy systems. They are also used in different industrial plants.
Protects electrical system from damage
It is also crucial for power transformers. Power transformers comprise multiple protective components like circuit breakers and fuses. So, they help prevent damage to the electrical system and heavy-duty machinery. It is also one of the major reasons why they are used in industries with heavy machinery.
Parts of a Power Transformer
Here’s a breakdown of the key components that make up these electrical devices. Each part has a unique function that is essential for the operation of the transformer within your electrical system.
Core: Typically made of laminated steel, the core provides a path for the magnetic flux.
Windings: Usually made of copper or aluminum, the windings are coiled around the core and carry the electrical current.
Insulating Materials and Oil: Insulating materials and insulating oil are used to prevent electrical short circuits and to cool the transformer.
Tank: The tank houses the core, windings, and insulating oil, providing structural support and protection.
Bushings: Bushings are insulators that allow electrical conductors to pass safely through the transformer tank.
Tap Changer: The tap changer adjusts the transformer’s voltage ratio to regulate the output voltage.
Cooling System: This system can include fans, radiators, or oil pumps to help dissipate heat generated during operation.
Fuses: Fuses protect the transformer from overcurrent conditions.
Breather: The breather allows the transformer to "breathe" air in and out, typically containing silica gel to remove moisture from the incoming air.
Specifications of an Electrical Power Transformer
Different features to look out for in an Electrical Power Transformer are listed below.
Phase
The two types are single-phase and three-phase. In a single phase, a single pair of coils is used. A primary coil and a secondary coil are used to generate the desired voltage. It has a less complicated design when compared to the three-phase transformers. Also, it produces an AC power supply of 1000 watts for the appliances.
In a three-phase, three single-phase transformers are winded over a central core. The three-phase structure includes six coils, out of which three are primary and the other three are secondary. The usage of three-phase transformers reduces the risk level to a larger extent and also withstands more power loads.
KVA Rating
KVA stands for Kilovolt-Ampere and this rating is used to rate a transformer. The kVA rating for the single-phase transformers will not be the same for the three-phase transformers. The kVA of a transformer should be equal to or greater than the rating of the load. In other words, a 1 KW load would require a 1 kVA transformer.
Primary Voltage and Secondary Voltage
Primary voltage refers to the voltage that is applied to the primary winding of a transformer. If the primary has fewer turns compared to the secondary, the step-up transformer is used to increase the voltage. And, if the primary has more turns compared to the secondary, the step-down transformer is used to decrease the voltage.
Secondary voltage is the coil winding that supplies output voltage. The output voltage varies with variations in the load resistance and even with constant voltage input.
Full Load Current
The full load current is defined as the maximum allowable current to the winding. For calculating the full load current, the voltage, kVA rating, and the type (single-phase or three-phase) are required.
Vector Type
The different vector types are approved by the International electrochemical commission and they categorize the LV windings and HV windings configuration of the three-phase transformer. The difference in winding connections produces different phase angles between the voltage of the windings.
Uses of Power Transformers
The primary function of a power transformer is to increase or decrease voltage between the two sides of the transformer connection. A step-up transformer is used to boost voltage, while a step-down transformer reduces it. Electric power plants generate low-voltage, high-current electricity; however, this is not suitable for transmission because low-voltage electricity loses power over long distances.
For example, a step-up transformer can amplify voltage from a low level of 12 kV up to 33 kV. This high-voltage electricity is not suitable for industrial, residential, or other applications, so the voltage must be reduced. A step-down transformer makes this voltage usable and is widely employed by power distribution companies.
Many different types of transformers are used in electrical circuits. Computer motherboards, amplifiers, and other electrical devices, such as mobile chargers, often require voltage adjustment. For instance, a transformer is used to start a motor because it requires a high voltage initially.
For high-voltage connections, three-phase transformers are commonly used. However, if any of the transformer’s three connections is disconnected, the entire system can become inoperable. Two-phase transformers are typically used when the high voltage ratio is greater than two compared to the low voltage. A reverse autotransformer is used when the high-to-low voltage ratio is less than two.
Various types of transformers are utilized in power generation and distribution plants, with each serving a different purpose in the power industry. The invention of the transformer has ushered in a new era in this field.
How Does a Power Transformer Work?
A transformer operates on the principle of electromagnetic induction, which is described by Faraday’s law. Its essential components include a primary winding, a core made of laminated steel sheets, a secondary winding, and insulation materials.
When an alternating current passes through the primary winding, it establishes a changing magnetic field around the transformer’s core. This phenomenon happens due to the magnetic effect of current flow.
With the flow of alternating current, the magnetic field inside the core expands and collapses alternatively. This continuously changing magnetic flux permeates from the inner core and reaches the secondary winding wrapped around the same core.
According to Faraday’s Law of electromagnetic induction, as the flux cuts through the secondary winding coil, an electromotive force is produced. By adjusting the number of turns in the two windings, a power transformer‘s turn ratio can be used to step up or down the secondary voltage relative to the primary voltage.
After passing through the isolated secondary winding, this transformed voltage is then available for onward power transmission or distribution applications.
Factors to Consider When Selecting an Electric Transformer
There are several factors to consider when selecting an electric transformer, including:
Voltage and Current Ratings
It is important to choose a transformer with voltage and current ratings that match the requirements of your system. If the transformer is too small, it may not be able to handle the load and could be damaged. Conversely, if it is too large, it will be less efficient and may cost more to operate.
Frequency
The frequency of the transformer should match the frequency of the power source and the load.
Power Rating
The power rating of the transformer should be sufficient to meet the power needs of your system.
Efficiency
The efficiency of the transformer refers to how well it converts electricity. Choosing a more efficient transformer can help reduce operating costs and minimize your carbon footprint.
Physical Size and Weight
The physical size and weight of the transformer should be considered, as it will need to fit in the available space and be transported to the installation site.
Cost
The cost of the transformer should also be taken into account. It is important to choose a transformer that provides the necessary performance and reliability while also being cost-effective.
Manufacturer
It is advisable to choose a transformer from a reputable manufacturer with a track record of producing high-quality products.
Our Factory
JINSHANMEN TECHNOLOGY CO., LTD(JSM for short) is located at 795 Nanming Road, Shuige Industrial Park, Liandu District, Lishui City. It is a domestic transformer industry production enterprise that integrates domestic and foreign high-tech. The company has advanced production equipment and strong technical strength. Its products have passed the ISO9001:2008 international quality system certification and the National Electrical Product Quality Supervision and Inspection Center, meeting IEC and national standards, as well as obtaining relevant certificates such as production licenses, national safety marks, and explosion-proof certificates.
FAQ
As one of the most professional power transformer manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy power transformer for sale here from our factory. Contact us for customized service.
power transformer, 500kva dry type transformer, 50kva transformer 3 phase