3 Phase 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 3 Phase Transformer
In some DC rectification transformers, voltage transformers can be constructed for a single-phase or two, three, six, and even complex combinations of up to 24-phases. Power generation, distribution, and transmission processes can use three-phase, denoted as 3φ or 3-phase. A 3-phase transformer works on a three-phase power supply and both primary and secondary windings have three sets of windings.
Advantages of Three-Phase Transformers
Space Efficiency
Three-phase transformers require less space for installation, making them a preferred choice in areas with limited real estate. They are particularly beneficial for urban installations where space is at a premium.
Lower Weight and Reduced Size
Three-phase transformers are typically lighter and more compact than their equivalent single-phase counterparts. This makes transportation and installation easier and more cost-effective.
Higher Efficiency
Three-phase transformers often exhibit higher efficiency in transforming electrical energy, resulting in reduced energy losses during operation. This can lead to energy cost savings and environmental benefits.
Cost-Effectiveness
Their compact design, higher efficiency, and reduced material requirements contribute to cost-effectiveness, making them a cost-efficient solution for power distribution.
Lower Transportation Costs
The reduced weight and size of three-phase transformers translate to lower transportation costs, as they are easier to transport to their installation sites.
Some common applications of three-phase transformers include:
Power generation
Step-up transmission voltages from generators to transmission lines
Transmission and distribution networks
Matches voltages between substations, distribution, and consumer levels.
Industrial applications
Supports large three-phase motors, variable speed drives, welding systems, etc.
Commercial facilities
Providing three-phase supplies to malls, apartments, offices, etc.
Transportation systems
Power railways, metros, electric vehicles charging infrastructure .
The Three-Phase Transformer Constitution
Apart from the core and windings, there are other vital parts in a transformer, as discussed below:
Insulation: This part acts as a barrier separating the windings from the core.
Thermometers: Thermometers monitor the temperature of the oil.
Transformer Oil: The transformer oil serves two main functions: insulation and cooling. Its insulation properties prevent electricity from shorting and arcing, while it acts as a coolant by transporting heat away from the core and windings.
Voltage Regulators: Voltage regulators adjust the output voltage, which tends to decrease under load conditions. Modifying the tapping turns using a tap changer adjusts the voltage ratio.
Pressure Relief Systems: These systems are part of the safety protocol. They alleviate overpressure situations when oil vaporizes due to short circuits.
Cooler: The cooling system cools the oil. It reduces the temperature of the hot oil via water or air-cooled tubes before returning it to the core and windings.
Tank: The tank protects the transformer windings and core from external conditions and holds the coolant.
Oil Conservator: The oil conservator is a vessel installed separately from the tank. It holds oil after it has expanded due to heating in the windings and core.
Gas-Actuated Relay: Gas-actuated relays, also known as Buchholz relays, detect gas released from the transformer tank. The presence of this gas indicates a potential problem with the transformer.
Breathers: Breathers work to keep the transformer oil dry by removing moisture from the air pockets above the conservator oil level.
What Can Be the Connections of a Three-Phase Transformer?
A three-phase transformer has three sets of primary and secondary windings to achieve different voltage and current requirements.
Delta-Delta Connection: In this arrangement, the three primary windings are linked in a delta configuration. Since there are three secondary windings, this configuration is also a delta. This connection is mainly used when the voltage transformation ratio is 1:1 and the load is balanced.
Delta-Star Connection: In this setup, the three primary windings form a delta, while the three secondary windings are connected in a star configuration. This connection is typically used when the load is not uniformly distributed and the main power is higher than the auxiliary.
Star-Star Connection: In this configuration, the three primary windings form a star connection, and the three secondary windings also form a star.
Autotransformer Connection: In this type of connection, the primary and secondary windings share some of the same wires. The autotransformer connection is generally used to provide a variable voltage output and is commonly applied in electrical power transmission systems.
Installation and Maintenance of Three-Phase Transformers
Three-phase transformers should be installed in strict compliance with electrical safety standards and codes. Regular inspections and electrical testing can not only detect potential electrical risks in a timely manner but also extend the service life of the transformer.
Preparation Before Installation
Safety must always come first when installing a three-phase transformer. To prevent accidental energization, turn off all power and follow lockout/tagout protocols. Carefully inspect the installation location to ensure it has adequate space, good ventilation, and easy access for future maintenance.
Installing the Transformer
Proper installation requires correct positioning and securing of the transformer. Begin by mounting it on a solid, flat surface free from instability or vibration that could impair its performance and durability. Once positioned, follow the manufacturer’s instructions to select the correct type and size of fasteners, securing the transformer with appropriate bolts and brackets. This meticulous attention to placement and securing will facilitate future maintenance and inspections.
Electrical Connections
Before making any primary connections, ensure that the input voltage meets the transformer’s requirements. Once confirmed, make the primary connections using the appropriate cables and connectors, ensuring each connection is tight and adequately insulated. Verify the secondary voltage requirements before proceeding with the secondary connections. This step is critical to prevent mismatches that could damage the connected equipment or the transformer. Follow the manufacturer’s wiring diagram closely to ensure accurate and safe connections.
Grounding and Bonding
An effective grounding system is essential for the safe operation of a three-phase transformer. Every metal component must be securely connected to a single grounding point, directing stray currents into the earth and reducing the risk of electrical fires.
Testing and Debugging
Before powering on the transformer, visually inspect each connection and component for any signs of damage, loose connections, or improper installation that could compromise performance or safety. Once the inspection is complete, gradually power on the transformer. Pay close attention to any unusual vibrations, sounds, or temperature increases, as these can indicate potential problems. Early detection allows for timely remedial action to limit further damage. After successfully powering on the transformer, gradually apply loads to evaluate its performance under operating conditions.
Daily Maintenance
Regular maintenance is essential for three-phase transformers to operate reliably and last a long time. Following a planned maintenance schedule can help avoid problems and maximize equipment lifespan.
●Regular Inspections: Check the transformer regularly for physical damage, corrosion, or overheating. Frequent visual inspections can help detect issues early. Routine oil analysis on oil-containing transformers is important to monitor insulation quality and detect potential problems before they become serious.
●Cleanliness and Ventilation: Keep the area around the transformer clean. Debris and dust can hinder insulation and cooling, leading to inefficiency or damage. Clean the transformer surface regularly to keep it free of impurities. Adequate ventilation is essential for effective heat dissipation during operation, so ensure sufficient airflow around the transformer to avoid overheating.
●Monitor Temperature and Load: Keep a close eye on the transformer’s temperature to identify any signs of overheating. Load balancing is crucial to avoid excessive stress on any single winding; ensure the load is evenly distributed across all phases. Uneven loading can lead to premature failure and wear of components.
●Electrical Testing: Regularly check the integrity of the transformer insulation by performing dielectric tests. These tests help detect faults early, before they become serious.
Types of Three-phase Transformers
Core Type
Three-phase core-type transformer is a type of three-phase transformer in which the primary and secondary windings are placed within one or all of the same core limbs, with each limb having two sets of windings. Each set, then, consists of three separate windings located in different reaches around the coil. The LV winding is wrapped around by HV wires and the HV winding is wrapped around by low voltage wires. The magnetic flux in these coils interact so that an AC voltage can be shared among them
Shell Type
Shell-type 3-phase transformers are three separate 1-phase transformers. Each of these three phases has its own magnetic field, which makes this type of transformer's core five-limbed. The high voltage and low voltage windings are around the three main limbs. The two outermost limbs serve as the flux return paths.
A three-phase transformer operates on the principle of electromagnetic induction. It converts AC power from one voltage level to another by inducing an electromotive force (EMF) in its secondary winding through the alternating magnetic field produced in its primary winding.
Here's how it works:
1.Three-phase AC power is applied to the primary winding of the transformer, creating a magnetic field.
2.The alternating magnetic field produced in the primary winding induces an EMF in the secondary winding.
3.The EMF in the secondary winding generates a secondary current, which is proportional to the number of turns in the secondary winding and the magnitude of the magnetic field.
4.The secondary current produces a secondary voltage, which is proportional to the secondary current and the impedance of the secondary winding.
5.The secondary voltage is transformed to a different voltage level than the primary voltage based on the turns ratio of the primary and secondary windings.
How to Select the Right 3-Phase Transformer
Understanding Load Requirements
While calculating your total connected load is crucial, it’s equally important to account for peak demand periods and potential growth. Consider implementing a demand factor analysis to determine the actual power draw during typical operation. This approach allows for more precise sizing and can potentially reduce initial costs without sacrificing performance.
Voltage Considerations
Examine your entire electrical system, including transmission distances and any intermediate step-down requirements. In some cases, a higher primary voltage can lead to reduced losses and improved efficiency, especially in industrial settings with expansive power distribution networks.
Environmental Factors
Altitude, ambient temperature, and humidity levels can significantly impact a transformer’s performance. For instance, installations at higher elevations may require derating due to reduced cooling efficiency. Our engineering team can guide you through these considerations, ensuring your transformer maintains optimal performance in its specific operating environment.
Harmonic Mitigation
Modern electrical systems often introduce harmonic distortions that can lead to increased heating and reduced transformer life. Consider specifying a K-factor rated transformer or exploring harmonic mitigating designs to address these issues proactively. Harmonic mitigation transformers are appropriate for installations with many harmonic loads, such as educational institutions, government buildings, commercial facilities, medical centers, and call centers, all of which require the consistent operation of computers, printers, and communication equipment. This foresight can result in substantial long-term savings and improved reliability.
Efficiency and Energy Savings
While initial costs are important, evaluating the total cost of ownership over the transformer’s lifespan is crucial. Our high-efficiency models may have a higher upfront cost but can lead to significant energy savings, especially in applications with continuous operation. We can provide detailed ROI calculations to help you make an informed decision.
Future-Proofing Your Installation
Consider potential changes in your power requirements over time. Selecting a transformer with some additional capacity or specifying a unit with multiple secondary taps can provide valuable flexibility for future expansion or system modifications.
The Consequences of Undersizing
While it may be tempting to select a smaller transformer to reduce initial costs, the consequences of undersizing can be severe. These may include:
●Reduced efficiency and increased operating costs
●Premature insulation breakdown due to overheating
●Voltage regulation issues affecting connected equipment
●Shortened transformer lifespan, leading to earlier replacement
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 3 phase transformer manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy 3 phase transformer for sale here from our factory. Contact us for customized service.
high voltage rectifier transformer, 100 kva 3 phase transformer, 33kv to 400v transformer