5MVA Power Transformer Purchase In 2022 | Daelim Belefic
Power transformer with big rated capacity is usually used in substations, solar farms, data centers, and crypto mining farms. Usually, they are the start of the power distribution system, taking the high voltage from the power line to the middle voltage to the distribution transformers.
For a 5MVA power transformer, Daelim can design 3 different types: substation type, pad mounted, or dry type. So which type of 5MVA power transformer will be suitable for your project? What technical information you should know before making the order? And how a 5MVA power transformer looks like? Check out today’s article, you will find out the answers.
What are the types of 5MVA transformers?
As we said at the start of this article, Daelim can design 3 types of 5MVA power transformers: substation type, pad mounted, and dry type. Let’s take a look one by one.
Learn more about 5 MVA Transformer
Substation type 5MVA power transformer:
Daelim designed a substation type transformers based on ANSI/IEEE, CSA, IEC, and AS/NZS standards. Input voltage and output voltage are based on your actual project needs, maybe you need to get high-voltage electric power from the power line, such as 138kV, 66kV, 44kV, etc... and need the output voltage to be connected to the power distribution transformers, such as 34.5kV, 24.94kV, 13.8kV, 12.47kV, etc... Other customers might use the transformers to power up their machines directly, such as their bitcoin miners, so the input voltage should come from the upper-level substation, like 34.5kV, 24.94kV, or 13.8kV, 12.47kV, etc... And their electrical equipment might need the low voltage such as 415/240V, 480/277V, 600V, etc... All based on your actual needs.
The design of substation type 5MVA power transformer can be designed based on the customer’s installation site, high voltage & low voltage bushings can be top mounted or sidewall designed.
For the rated capacity, 5MVA is for the ONAN cooling system, if you want more than 5MVA, just in case the electric energy used is more than estimated, we can also design the cooling system to ONAF. “AF” means “air force”, which is adding cooling fans to the radiators, to improve heat dissipation. If choose “ONAF” cooling, the rated capacity can be upgraded to 7.5MVA or even more.
Learn more: Substation Transformer Ultimate Guide, You Need To Know
Pad mounted 5MVA transformer:
Most of three phase pad mounted transformers are under 4000kVA, 34.5kV, as distribution transformers to power the electrical equipment directly. But in our project experience in the North American market, there are also customers asking for pad-mounted transformer designs with 5MVA, 44kV, or even more.
Pad mounted design 5MVA power transformer can also add cooling fans, to improve the capacity. And the transformer oil can use vegetable oil if necessary.
If the customer also needs a switchboard to connect with the transformer, Daelim can also offer a whole solution “Transformer + Switchboard”. We have a partner in the USA who is a professional manufacturer of UL-listed switchboards. By working with our partner, Daelim will support you with a “one-stop” power supply solution.
Learn more about : 5MVA Pad Mounted Transformer
5MVA Dry type power transformer:
In addition to local lighting, high-rise buildings, airports, and terminal CNC machinery and equipment, dry-type transformers are widely used. Dry-type transformers are those whose iron cores and windings aren't immersed in insulating oil. There are two types of cooling methods: natural air cooling (AN) and air-forced cooling (AF). Under natural air cooling, the transformer can run continuously for a long time below its rated capacity. With air forced cooling, the output capacity of the transformer can be increased by 50%. Due to the large increase in load loss and impedance voltage during overload, it is not suitable for continuous overload operation for long periods of time.
For dry type transformers in the Canadian market, there are 2 temperature rise levels, 150℃ and 200℃. We can produce dry type transformer with 150℃ temperature rise level, so need to confirm with the customer’s engineer and then offer the price and technical solution.
Read more: Ultimate guide of cast resin dry-type transformer
What are the parts of 3-phase 5mva power transformer?
Substation type
For substation type 5MVA power transformer, the standard parts are:
* Insulating mineral oil
* 60/50 Hertz operation
* Externally operated de-energized tap changer with (2) 2.5% full capacity taps above and below nominal
* 65°C average winding rise
* HV and LV bushings
* HV and LV flange connections
* Pressure-vacuum gauge
* Liquid level gauge
* Liquid temperature gauge
* Pressure test valve
* Drain/filter valve with the sampling device
* Tank lifting lugs
* Corrosion resistant nameplate
* Hydran provision (above 7.5 MVA)
Read my article on 5+FAQ About 15kV Transformer
Optional parts:
•High-fire point fluid, such as silicone, hydrocarbon or vegetable fluids. (up to 10 MVA)
• 55° C 55/65° C average winding rise
• Forced air cooling
• Forced air cooling with 2 stages (from 7.5 MVA and up to 15 MVA)
• Removable radiators
• Pressure relief device
• Winding temperature device
• Sudden pressure relay with or without seal in
• Devices with alarm contacts
• Top filter press valve
• HV & LV air terminal compartments
• HV lightning arresters
• Current transformers
• Neutral grounding resistor
• Special impedances
• Low losses
• Special environment (i.e: classified areas)
• Special/low sound level
• Retrofit to specific dimensions
• Non-standard loading conditions such as harmonic loading or specified K-factor
• Stainless steel removable radiators
• Galvanized steel removable radiators
• Special paint for marine ambient
• Special paint thickness
• Special colors
• CSA compliance
• Other special features upon request
Get it now: How to choose pad-mounted transformer for your project?
Pad-mounted 5MVA power transformer
Standard Parts:
-The etching door for security
-Removable sill for easy installation
-Stainless steel cabinet hinges and mounting studs
-Bolted-on cabinet with removable sill having the following depths:
/19’’ deep for 300kVA through 750kVA
/22’’ deep for 1000kVA through 1500kVA
/24’’ deep for 2000kVA through 3750kVA
/30’’ deep for 5000kVA through 7500kVA
-For live front construction, externally clamped high voltage porcelain bushings with a single eyebolt, clamp-type connector (accommodates #6 AWG solid to 250 MCM stranded conductors).
-HV and LV compartment doors-hinged and lift-off type with 120° holding bars.
-Steel HV/LV compartment barrier
-Padlocking facility with one Penta-head bolt on the LV compartment door and two Penta-head bolts on the HV compartment door - including 3 point latching mechanism.
-HV connection:
/Live front-external clamored and removable HV bushings with eyebolt, clamp type connector.
-LV connection:
/Externally clamped polymer & porcelain LV bushing with 4~12 hole spades.
-Oil drain plug for 500kVA and below.
-1’’ drain valve with sampler for 750kVA and above
-Oil fill plug
-Five-legged core/coil assembly.
-Removable LV neutral ground strap as required
-Nameplate per CSA, ANSI/IEEE requirement
-Self-actuating pressure relief valve
-Lifting lugs(4)
Try for free: How to choose pad-mounted transformer for Crypto Mining?
Optional Parts:
-Oil level gauge
-Liquid temperature gauge
-Pressure vacuum gauge
-Welded cover with handhole
-Oil drain valve with or without sampler
-Mechanical pressure relief device mounted on the tank cover
-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
/Spade supports are available. They are provided for 8-hole spades and larger
-Primary Switching:
/LABOR oil switch: one for radial feed.
/Externally operated de-energized tap changer
/Externally operated dual voltage switch
/Externally operated △-Y switch
/2-position load break oil switches
4-position T or V blade sectionalizing loop switches
-Overvoltage Protection:
/Distribution class, metal oxide arresters, 3-36 kV.
/Distribution class, valve-type lightning arresters, 3-27 kV.
-Over-current protection:
/Bayonet-type expulsion fuses with plastic drip cup mounted on each bayonet fuse
/Secondary under the oil circuit breaker
-Additional construction options:
/Stainless steel tank and cabinet design
/Partial stainless steel design (cabinet sill and tank bottom)
/30’’ or 34’’ or 40’’ deep cabinet
/CT’s or PT’s, including mounting support
/LV externally mounted molded case breaker
/Externally mounted kWh meter
/Flip-top cabinet for low profile design
/Additional externally mounted nameplate
/Different paint color per requirement
-Weather cover:
/Transformers may feature an optional weather cover over the cabinet which is hinged to allow clearance for the replacement of the bayonet-type fuses.
/The weather cover can be lifted easily into place and secured with a single supporting arm.
/The weather cover requires no additional hold-down hardware.
Read on: What is a Live Front 25kv Pad Mounted and Substation Transformer Specification?
5 MVA power transformer dimensions & weight?
The dimensions and weight of the 5MVA transformer is depends on the design, standard, and accessories that the customer required.
Here is the production drawing of Daelim’s order to Canada, a 5MVA substation-type transformer with side-mounted bushings, cable box on the HV side, and 4 radiators without cooling fans. For your reference.
Keep reading: The Ultimate Guide to 5mva Transformers
Canadian customer purchases 3-phase 5MVA power transformer case
The three sets of 5MVA power transformers were exported to the Montreal area of Canada in 2020. They are three-phase step-down transformers from 44kv to 12.47kv. The high-pressure side is 44kv, and the low-pressure side is 12.47kv. These two devices are no-load pressure regulating switches, the pressure regulating range is ±2*2.5%, a total of five gears, from 41.8kv to 46.2kv. Many accessories use Qualitrol branded. The cooling method is ONAF, the capacity can reach 5000kva in the case of self-cooling, and the capacity can reach 6667kva in the case of forced-air cooling (turn on the fan).
The customer is located in Canada, so according to the local transformer equipment requirements, the 5mva transformer is designed and produced according to the CSA C88 standard. Daelim's team of engineers has more than 20 years of experience in transformer design and production and can solve any technical problems related to 5mva transformers.
The technical data table of the 5mva power transformer
| Delivered to | Canada |
| Year | 2020 |
| Type | Three phase power transformer |
| Standard | CSA C88 |
| Rated Power | 5 MVA |
| Frequency | 60 HZ |
| Phase | Three |
| Cooling method | ONAN,ONAF |
| Primary Voltage | 44kV |
| Secondary Voltage | 12.47kV |
| Winding Material | Copper |
| Vector Group | Ydn1 |
| Impedance | 5% |
| Tap Changer | NLTC |
| Tapping Range | 2*2.5% |
| Insulation oil weight | 2500kg |
| Total weight | 11320kg |
| ONAN kVA rating | 5000kVA |
| ONAF kVA rating | 6667kVA |
Learn more: How To Purchase 3000kVA Transformer In USA & Canada
5mva power transformer production process
After the customer places the order and confirms the drawings, the technical team will hand over the material list to the purchasing department, and the purchasing department will purchase raw materials strictly according to the material list, including the purchase of imported parts. Daelim has a special quality inspection department to strictly control and review the quality of raw materials.
With the procurement of raw materials in place, the production department will quickly assemble and produce various components of the transformer, including transformer winding, iron core production, theme drying, and overall assembly.
5mva power transformer testing
After the production is completed, it will enter the experimental link to test the performance of the transformer to ensure that it fully meets the CSA standard, and send the test report of the transformer to the customer for confirmation. Only when there is no problem at all can it be shipped from the factory.
5mva power packaging and shipping
Transformers have an important job before transportation, which is the packaging. Daelim's packaging team will use the fumigated logs to make solid wooden support, put the transformer on the wooden support and fix it with straps, and then further fix it in the shipping container. Ensure stability during transport. Some key parts, such as exposed casings, terminal boxes, and other accessories, will be wrapped in layers of plastic wrap to ensure that they will not be corroded or chemically rusted in the humid and acidic environment at sea.
Read more: Do You Know How To Do a Transformer Test?
5mva power packaging and shipping
Transformers have an important job before transportation, which is the packaging. Daelim's packaging team will use the fumigated logs to make solid wooden support, put the transformer on the wooden support and fix it with straps, and then further fix it in the shipping container. Ensure stability during transport. Some key parts, such as exposed casings, terminal boxes, and other accessories, will be wrapped in layers of plastic wrap to ensure that they will not be corroded or chemically rusted in the humid and acidic environment at sea.
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The customer receives 5mva power transformers
Soon the customer successfully received these three 5mva transformers. The customer was very satisfied after seeing the appearance and said that the transformers are very beautiful. Various inspections and experiments were carried out before installation, and all items were in line with CSA standards and technical requirements. Their installation team successfully installed and put it into use according to the installation instructions of the Daelim 5mva transformer.
The client said that Daelim is the best partner he has ever met because he has cooperated with Daelim on many transformer projects, both direct purchase and bidding type, whether in terms of technology, business communication or bidding documents. The preparation made him feel professional and efficient. Until now, I am still cooperating with Daelim to develop and progress together. Win-win is Daelim's business philosophy, so Daelim will be your best partner.
Try for free: The Ultimate Guide to 2500KVA Transformer
FAQ about 5mva transformer
1. How long is the lead time for the transformer?
The delivery time of the transformer depends on its voltage, capacity, and quantity, usually about 4 weeks for transformers below 35kv, and longer delivery times for transformers with large capacity above 35kv.
2. How long is the warranty period for the 3-phase 5MVA power transformer?
The warranty period of Daelim transformers is 24 months, and the warranty period can be extended accordingly according to customer needs.
3. How long does the transformer last?
Typically, transformers are designed for a 20-year lifespan. In standard temperature environments, transformers designed by Daelim typically have a lifespan of 30 years or more.
4. What is the payment method?
Daelim's payment method has TT/LC for you to choose from.
5. What are the test reports for the 5 MVA power transformer?
Daelim transformers have UL certificate, CSA certificate, NEMA, and CESI. The test report includes the factory test report of the transformer, the third-party SGS test report, the CSA test report, etc.
For pad-mounted transformer, substation transformer, and dry type transformer design, Welcome to contact us for a detailed solution based on your project needs.
If you have any project that needs 5mva power transformer, welcome to share with Daelim, Daelim Belefic will be your trusted partner for transformer supply.
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