Solar Transformer, Get The Best Price
Solar energy is the most abundant energy source on earth, and contemporary solar energy can be used to produce other renewable energy sources. We can convert solar energy into electricity. At present, there are two main conversion forms in the world, one is solar photovoltaic power stations, and the other is solar thermal power stations. Whether it is photovoltaic power generation or solar thermal power generation, solar transformers are used.
Daelim is a professional and famous transformer supplier. Its design and production of pad-mounted transformers, substation transformers, and dry transformers can provide solar power solutions for your project. With its professional competence and strict quality control system, Daelim can supply high-quality transformers all over the world. The designed and produced transformers fully comply with IEEE/IEC, DOE, AS/NZS60076, CSA, and other international standards, and the transformers have UL/cUL, CSA, IEEE, CESI, SGS, and other certificates and reports.
From residential rooftops to commercial and industrial applications and utility-grade power plants, DAELIM's fit-for-purpose solar distribution transformers are specifically matched to different solar inverter sizes and their applications.
Continue reading for more details.
The solar transformer is also called a photovoltaic transformer, referred to as a PV transformer. Transformers play a significant role in the production and distribution of solar energy. Transformers are used in photovoltaic projects, mainly to increase the voltage output by the inverter. Help the photovoltaic system to better connect with the grid system. In a solar power plant, it is usually a step-up transformer. The transformer boosts the AC voltage output by the inverter to the grid voltage level. This allows access to the utility grid for use by end users.
The transformers designed and produced by Daelim mainly have the following characteristics:
1. FR3 dielectric fluid provides fire safety, equipment reliability, and a projected lifespan well beyond that of a traditional mineral-oil transformer making it a key component in the balance of system (BOS) distributed energy resources (DER) solutions
2. Custom-optimized transformer designs for specific loading profiles, impedance requirements, and single or multiple inverter connections
3. Increased overload capability above nameplate without loss of insulation life
4. Fully complements solar/energy balance of system (BOS) solutions including DC and AC combiners, disconnects, fuses, breakers and AC recombines, pad-mounted switchgear, pole-mounted reclosers, air switches, capacitors, and a full offering of services
In the photovoltaic grid-connected power generation system, the step-up transformer is one of the key pieces of equipment. How to optimize the selection, reducing the loss of the transformer itself, and improving the efficiency of the transformer is one of the factors to improve the efficiency of the photovoltaic power generation system. Next, we will make a reasonable selection of step-up transformers in photovoltaic grid-connected power generation systems by comparing and analyzing different types of transformers.
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According to active power/power factor = apparent power, this formula is used to calculate the required transformer capacity. The power specified by the power supply bureaus in different regions is not the same, but basically, the power factor of construction electricity and small industry is 0.85. The power factor of large industrial electricity is 0.9. Therefore, assuming a 550kW construction equipment, the transformer size that should be selected = 550kW/0.85=647kVA, so a 630kVA transformer should be selected. The sum of the load power cannot exceed 80% of the selected transformer power.
It should be noted that when using a photovoltaic transformer to access the utility grid, the transformer has no other load. The main consideration is that the maximum output power of the inverter cannot exceed the transformer capacity. The maximum output power of the inverter is related to the capacity of the photovoltaic component, the angle of installation and the inclination angle, and the installation venue. The output power of photovoltaic inverters is generally 0.9 of the component, and the transformer power factor is also 0.9. Therefore, the photovoltaic component and transformer are required to configure 1: 1, or the transformer capacity is greater than the component capacity.
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The primary voltage of the solar transformer is selected according to the voltage value generated in the photovoltaic power generation system, and the voltage of the secondary coil is selected according to the integrated grid voltage. It is best to choose a low-voltage three-phase four-wire power supply. For example, if the output voltage of the solar inverter is 600V, then the primary side voltage of the transformer is 600V. The integrated power grid is 13.8kV, then the secondary side voltage is 13.8kV.
Solar power plant transformer usually uses three-phase transformers.
Learn more about three phase transformer
The step-up transformer for the solar power plants, connection group is mainly composed of Dy1, Dy5, and Dy11.
Photovoltaic transformers are usually Dy-connected. At present, the solar transformers in most countries in the world use the Dy connection, mainly because the use of the Dy connection has advantages compared with the use of the Yy connection:
① D connection has a great effect on suppressing the bad influence of higher harmonics
② In the D-connected transformer winding, its third harmonic circulating current can generate the third harmonic magnetomotive force in the transformer, which can be balanced and offset with the harmonic magnetomotive force of the low-voltage winding;
③ The harmonic electromotive force of the high-voltage winding circulates in the D-connected loop, and the harmonic current can form a circulating current in the D-connected primary winding so that it does not enter the public high-voltage power grid.
④ The zero-sequence impedance of Dy-connected transformers is much smaller than that of Yy-connected transformers, which is beneficial to the removal of low-voltage single-phase-to-ground short-circuit faults.
⑤ The Dy connection makes the transformer's ability to withstand unbalanced loads far greater than the Yy connection.
⑥ Dy connection transformer is more protective and safer than Yy. When one high-voltage phase of the transformer fails, when the first-phase fuse on the high-voltage side is blown, the other two-phase loads of the transformer can still operate normally, but the transformer connected to Yy cannot.
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Considering the particularity of photovoltaic power generation, that is, power generation during the day, no matter whether the power generation device outputs power or not, as long as the transformer is connected to the system, the transformer will always produce no-load loss. The load loss of the transformer is required to be as low as possible. If the transformer runs at night, the no-load loss is also required to be low;
The working place of the transformer is clean, and the dust-free capacity is not very large. Usually, the dry-type transformer can be selected if the capacity is less than 800kVA. Otherwise, the oil-immersed transformer should be selected. The oil-immersed transformer will naturally decide for you whether it is natural cooling or air cooling according to the size of the capacity.
The main features of dry-type transformers are small size, lightweight, fire-proof and explosion-proof, and maintenance-free, but once the dry-type transformer fails, it will be scrapped directly and need to be repurchased.
When the photovoltaic power generation system is connected to the utility grid, the step-up transformer should be selected according to the following principles:
① Self -cooled and low-loss power transformers should be preferred.;
② The volume of the voltage transformer can be selected according to the maximum output power of the photovoltaic square module.
③ A high-voltage/low-voltage pre-installed box-type substation can be selected. For photovoltaic power stations on coastal or wind sand, when the outdoor layout is adopted, the coastal protection level should reach IP65, and the protection level of the photovoltaic power station with wind and sand should reach IP54.
④ The transformer can choose a dual-winding transformer or a split transformer.
⑤ The transformer should be used for unlimited voltage transformers.
The shape and structure of solar transformers are basically the same as ordinary transformers. It mainly includes a tank, iron core, winding, bushings, etc.
With the formal effect of the Global Carbon neutrality of the Paris Agreement in 2016, renewable energy has become a development trend. Wind energy, solar energy, and battery energy storage industries have grown rapidly. It is found that the transformer can improve the voltage generated by the solar inverter and has good economic benefits.
But solar inverters are not allowed to use conventional power distribution transformers in this application. Therefore, a special customization design needs to be carried out. These differences are based on the nature, inverter technology, and operating methods of solar power plants, including:
1. Inject the harmonic current content of the transformer does not exceed 5% of the rated current. A transformer for photovoltaic power generation does not lose life when the current harmonic content of this current
Life. When the total harmonic content of photovoltaic power transformers exceeds 5%of the load-rated current, it should be explained.
2. Between each low-voltage winding and the high-voltage winding, the low-eddy loss electrostatic shields (ESS) must be provided.
- Preventing capacitance coupling between low-voltage and high-voltage winding, in the solar power plant, the low-voltage winding is usually ungrounded wye connection winding.
- Prevent the switch operation of the circuit breaker or multi-stage capacitor group, from the high-voltage winding to the low-voltage winding
- Prevent the transition of high-frequency (harmonic) voltage interference caused by the inverter during voltage reversal.
3. The transformer can only have one point of ground, and the grounding of the transformer must be firm;
4. The insulation class shall be at least F for dry-type transformers and A for oil-type.
5. The protection level of the tank is not less than IP54
6. The air load loss in the performance parameters of photovoltaic power generation and the load loss is not allowed to be a positive deviation.
7. In high altitude areas, the U.S. -Merchant -high -voltage cable head should choose a full insulation plug-in cable head
8. The high-voltage side should adopt the bottom-line method
9. The low-voltage sideline is the bottom line. The low-voltage side is a low -temperature circuit breaker lightning-resistant (surge protector) ten bus bronze volumes. The busbar copper row should consider connecting multiple cables. The height of the busbar's row should be reserved enough to meet the connection and installation of the cable.
10. The transformer for photovoltaic power generation should be used in box change special temperature monitoring devices. This device should meet the following requirements:
- Use the PT100 temperature sensor number to display the oil surface temperature:
- With an independent alarm contact, provide PT100 temperature remote signal or 4 ~ 20mA signal output or 485 communication interface:
- The temperature sensor should be installed at the highest temperature place in the transformer oil;
- The temperature monitor should have 2 pairs of independent electrical contacts, one of which is used for alarm and the other is used for the trip:
- The working temperature range of the device is -40 ~ 70 ℃;
11. The technical parameters of the components used should meet the requirements of the photovoltaic electric field operating environment.
The main feature of oil-immersed transformers is that the cooling effect is good, which can meet the needs of large capacities. The selection of vegetable oil for transformer oil is also environmentally friendly, pollution-free, and has a longer service life. The disadvantage is that frequent inspections and regular maintenance are required to avoid the danger of failure or even transformer explosion due to oil leakage, oil shortage, insulation aging, etc.
The difference between a split transformer and an ordinary transformer is that in its low-voltage winding, one or more windings are split into several branches with equal rated capacity. There is no electrical connection between these branches, but only weak magnetic connection. , and there is a large impedance between the branches. The most widely used is the double-winding double-split transformer, which has one high-voltage winding and two split low-voltage windings, and the rated voltage and rated capacity of the split windings are the same. When a split transformer is used to supply power to two busbars, when a short circuit occurs on one busbar, in addition to effectively limiting the short-circuit current, the voltage on the other busbar can be kept at a certain level without affecting the user's operation.
A photovoltaic step-up transformer is the splitting of the low-voltage side into two windings of the same capacity, connecting the windings of the group and voltage level, and connecting two photovoltaic cells respectively. The main purpose is to limit the short-circuit current and reduce the number of transformers.
Its main feature is safety: it completely insulates the electrical appliances on the primary side and the secondary side and also isolates the circuit. The high-frequency loss of its iron core is large, thereby suppressing the introduction of high-frequency clutter into the control loop. However, it can only be used in small-scale power supply areas and places with short lines. Because the current to the ground is very small, it can protect personal safety, but it is not enough to cause personal injury. Another very important role is to protect personal safety!
1 Self-cooling, low-loss power transformers should be preferred.
2 The capacity of the step-up transformer can be selected according to the maximum output power of the photovoltaic square array unit module.
3 High-voltage/low-voltage prefabricated box-type substations or open-type equipment composed of transformers and high and low-voltage electrical components can be selected. For photovoltaic power stations located on the coast or with heavy wind and sand, when the outdoor layout is used, the coastal protection level should reach IP65, and the protection level of photovoltaic power stations with heavy wind and sand should reach IP54.
4 The transformer can be a double-winding transformer or a split transformer.
5 The transformer should be a non-excitation voltage-regulating transformer.
6 Prevent electrostatic shielding layer between high and low voltage to prevent high and low voltage mutual inductance.
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1. Rated output kVA:
• Based on inverter output ratings, load diagram, harmonic content, weather patterns, and unusual service conditions
2. Nominal Voltage:
• Designed for Inverter Transformer to be compatible with the Pulse voltage shape of inverters
3. Winding connection diagram and vector group:
• Inverter operation is not affected by vector groups like Dy1, Dy5 or Dy11
• No Neutral required on the Primary LV side
• Isolated neutral point on Secondary HV side transformer
4. Electrostatic Shield (ES):
• Recommended installation of ES between primary and secondary windings to minimize the potential transfer of high-frequency voltage disturbances (harmonics, pulses, surges) from primary to secondary
• Windings typically connected to inverter circuits are ungrounded
DAELIM fully complies with C57.159 – 2016 IEEE Guide for Application in DPV Power Generation Systems.
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DB solar transformers' design can be applied to any environmental conditions. Customized design to meet the requirements of all customers. Daelim's solar transformers have the advantage of energy conservation, and according to solar power generation capacity and collecting array voltage level rated, they can fully meet all applicable international standards and regulations. Daelim mainly designs the following two solar transformers.
3 phase pad mounted transformer is an easy-to-install distribution transformer with an anti-tamper and anti-theft design. It is widely used in photovoltaic projects in the North American market and is used to connect solar inverters to integrate electric energy into the grid.
The picture below is the 3-phase pad-mounted transformer drawing designed for the Canadian photovoltaic project. It is different from the ordinary transformer in appearance. The low-voltage terminal is designed side-top on the side of the tank.
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Frequency: 50 Hz, 60Hz
Standard: IEEE, CSA
Tank Type: Padmount
Base rating: 750 kVA through 10,000 KVA
High Voltage (HV): 2.5 kV through 44 kV
Low Voltage (LV): 208Y/120 to 25,000 V
Windings: Copper, Aluminum
Solar pads are available in various configurations to accommodate typical inverter connections and performances
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Frequency: 50 Hz, 60Hz
Standard: IEEE, CSA
Base rating: 750 kVA through 10,000 KVA
High Voltage (HV): 2.5 kV through 35 kV
Low Voltage (LV): 208Y/120 to 25,000 V
Windings: Copper, Aluminum
Solar pads are available in various configurations to accommodate typical inverter connections and performances
The transformers provided by Daelim can match any size inverter in solar photovoltaic power generation.
1. Fast submit the drawing
In order not to affect the delivery time, the DAELIM engineer team delivered the drawings in batches. 60% of the drawings were delivered within two weeks and production was arranged in time . The remaining drawings were successfully delivered in the remaining two weeks.
2. Make a good production plan
DAELIM's management pays much attention to the needs of customers and has communicated with the production team and our supplier team many times. The workers worked overtime to ensure the delivery of customer requests.
3. 100% meet the standard requirements
Our team of engineers studied the CSA Standard carefully. Because they are based on IEEE standards, DAELIM designed and produced them according to them. For the existing technical problems or differences, our team has carried out hundreds of e-mail and telephone communication with customers.
DB solar transformers can be applied to any environmental conditions. Customized design to meet the requirements of all customers. Daelim's solar transformers have the advantage of energy conservation, and according to solar power generation capacity and collecting array voltage level rated, they can fully meet all applicable international standards and regulations.
Click here for specific solar transformer solutions.
There are different types of solar transformers including three-phase pad mounted, oil immersed, substation, and dry transformer. All solar transformers have special needs that affect cost. Dry uses air as the cooling medium, while liquid uses oil.
A three-phase pad-mounted transformer is a kind of oil transformer, and it is also a very common solar transformer in recent years. Especially in the US and Canadian markets in North America. The pad-mounted transformer is widely loved by the market due to its compact structure, tamper-proof design, and easy maintenance.
Daelim's pad mount transformer has SGS, CESI, CSA, and other test reports, UL/cUL, CSA, IEEE, and other certificates, transformers less than 2500kVA can also be designed to meet the US DOE efficiency value standard. Daelim's pad mount transformers are exported to North America in large quantities, and there are after-sales service teams in markets such as the United States and Canada.
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Daelim's pad mount transformer can be designed with dual voltage and meet the K factor rating. Pad mount transformer conventional capacity has 300 kVA, 500 kVA, 750 kVA, 1000 kVA, 1500 kVA, 2000 kVA, 2500kVA, 3000kVA, 3750 kVA, and 5000kVA, Daelim's 3-phase pad mount transformer has A capacity of 10MVA can be achieved.
Daelim's pad mount transformer optional accessories: Oil level gauge, Liquide temperature gauge, Pressure vacuum gauge, Primary termination: externally clamped bushing wells with load break inserts/Integral load break or non-load break bushings, Secondary termination: externally clamped bushings with NEMA 4-hole, 6-hole, 8-hole, 10-hole or 12-hole spades, overvoltage protection, etc. For the above accessories, you can choose Qualitrol, ABB, and other internationally famous brands.
A substation transformer is also a commonly used transformer in solar power plants. It is characterized by low loss, and the radiator and air terminal chamber can be disassembled for easy transportation and movement.
Daelim's substation transformer with high voltage up to 34.5kV, and rating up to 20 MVA. Design and production conform to CSA/ASUL/DOE and other standards, with a UL certificate. There are four structural layouts of American Standard. The high and low voltage bushings are sides out on both sides, the high and low voltage bushings are on top sides, and one side is out and the other side is on top. Substation transformers are usually colored gray and green.
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Unlike dry transformers, the body of an oil-immersed transformer is fitted inside a welded steel tank that has been filled with oil insulation. When an oil-immersed transformer operates, its iron core heats the coil, which is subsequently transported into the insulation fluid and then onto the medium to cool. The voltage of Daelim's oil-immersed transformer can reach 220kV, and the maximum capacity can reach 240MVA.
This type of transformer has no moving parts. They are inert devices that utilize thermal insulation technologies that are environmentally friendly.
The word "dry" refers to the fact that the transformer is kept cool through natural ventilation rather than using silicone, oil, or liquids to cool the coils and electrical core.
Dry-type transformers are not required to be housed in fireproof vaults or catch basins. This type of transformer is safe and may be used in a variety of locations, they can be placed close to the equipment and indoors, making the entire process more efficient.
For enhanced performance, some systems combine dry-type units with tanks. These transformers are appropriate for both indoor and outdoor installations. They are dry-type liquid-cooled transformers, often referred to as dry-and-liquid transformers or hybrids.
The main difference between solar photovoltaic power generation and solar thermal power generation is:
1. Solar thermal power generation has large investment, large construction site, long construction period, and high construction cost;
2. Solar thermal power generation is more controllable than photovoltaic power generation, and the power is stable and adjustable;
3. The transformer capacity for solar thermal power generation is larger and the running time is longer
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1. Requires lower loss;
2. Strong voltage overload capability;
3. There are both DC waves, and a shielding layer should be placed between the high and low to prevent high and low voltage mutual inductance
The function of a solar transformer is very simple, it converts direct current (DC) electricity generated by a solar panel to alternating current (AC) electricity used by the power grid.
There are three main differences between transformers used in solar photovoltaic projects:
Transformers used in solar power plants must have an electrostatic shielding design, which exists to eliminate electromagnetic interference from solar inverters;
Transformers on solar power plants usually need to be used for remote control. Therefore, oil temperature gauges, oil level gauges, pressure gauges, etc. need to have contacts, and these accessory contacts with contacts need to be assembled in a control box.
Due to the design of the electrostatic shield and the control box, the solar transformer price is higher by 10-20%.
The following table is the solar transformer specification, and the part marked in yellow is the special requirement of the solar transformer in the PV project.
|Solar Transformer||Ordinary Transformer|
|HV: 12470Y/17200V||HV: 12740|
|LV: 480deltav||LV: 480Y/1.732|
|60HZ ONAN||60HZ ONAN|
|NEMA 4x Control Box|
|Primary Surge Arresters||Primary Surge Arresters|
|Nitrogen Blanket||Mineral oil 45# (PCB FREE)|
|Electro Static Shields|
|BUILT TO IEEE C57.12.34 Std and DOE St||BUILT TO IEEE Std. C57.12.00 IEEE Std. C57.12.90 IEEE Std. C57.12.34|
Yes, absolutely! Transformers are essential components in both the production and delivery of solar energy. Transformers have previously been used to step-up or step-down electricity from renewable sources.
Three-phase transformers are the most common type of transformer used in power plants. Three-phase systems are more efficient and can handle larger voltages. They can also power three-phase motors, power tools, and major companies. Furthermore, its system structure allows for longer power distribution distances. Transformers are commonly used in solar power generation, the voltage is 6.3-38.5kV, and the capacity is 630kVA-3150kVA.
A three-phase transformer is an electromagnetic device that is used to transfer energy or send electrical signals between circuits using Faraday's electromagnetic induction phenomenon. Three-phase transformers play a crucial part in the transmission of power. They are primarily used in industrial applications to create the power to transmit, distribute and store electricity. Dry type transformer, small substation transformer, pad mounted transformer, and power transformer all have three phases. Three-phase transformers are installed in locations that use an enormous amount of electricity, such as hospital buildings, apartment buildings power stations, and solar power plants.
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There are two primary aspects to be considered when designing transformers powered by inverters that are which are powered by PV arrays.
Considerations for the environment, typically ambient temperature.
Modern PV inverters usually produce a sinusoidal voltage and the current waveform is similar to the ideal sine wave. So grid-tie transformers generally do not need to be large in the event that solar power inverters operate them. General-purpose transformers are typically specifically designed. Non-linear loads could cause the voltage and current to cause Total Harmonic Distortion (THD) which could impact the transformer's performance and cause an increase in heating. A K=4 transformer can manage the distortion typical of non-linear loads when that's an issue. Changes in load speed should not have any effect on the effectiveness of dry-type transformers.
The environmental conditions, like ambient temperature, must also be taken into consideration. Grid-tie transformers typically don't experience a maximum load or, if they do, it will last less than an hour, based on typical load curves for solar facilities. Dry-type transformers with 220 to C insulation and 150 degrees C temperatures are built to handle their highest load for as long as the temperature of the surrounding area is not more than 40 degrees C and averages around 30 degrees C during any 24-hour time period. In areas that have high temperatures in the air in the winter, lower temperatures for dry-type transformers must be taken into consideration. 130 o C Temperature rise raises the maximum ambient temperature to sixty 60C while the median of 50 o C in a 24-hour span. A 115 or C temperature rise is capable of handling more extreme ambient temperatures if required. It is usually more economical to choose transformers with lower temperature rises rather than manually increase the power for the particular transformer.
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Daelim is a professional solar transformer manufacturer with ul/cul and CSA certificates. Wide range of pad mounted transformers, substation transformers, oil-filled transformers, and dry-type transformers for your solar project. In addition, Daelim solar transformers have been applied to photovoltaic projects in the North American market. Contact Daelim to get the project case of Solar Transformer in North America.
1. Experience in supplying multiple projects in American Countries such as U.S. and Canada
2. Qualified with UL, cUL, CSA certificate, SGS test report, etc.
3. Complete after-sales service and installation teams in Canada, USA, etc.
4. Strong design ability for high efficiency, special ambient, low sound level,50 Hz and 60 Hz,k-factor rating, etc
5. 6-7 weeks of production time
Daelim believes that it is essential to produce high-quality products at reasonable prices. Within each component, they never compromise on performance or environmental responsibility. Because of this dedication, they are your one-stop shop for all things electrical. If you have any questions about your project, you can contact the Daelim team, and their professional team will provide quick feedback.
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Delta Wye transformer refers to a transformer type whose connection mode is delta Wye connection. Delta Wye connection is most commonly used on three phase transformer. Delta Wye transformer is a kind of transformer under the transformer classification based on the connection mode.