1,000+ Electrical Transformers (7.2–34.5 kV, 25–3000 kVA) — UL Evaluated, Certificate of Compliance Available — In Stock & Ready to Ship from Houston, CA & Florida. Contact Us Today!
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Daelim’s power transformers are accordance with ANSI/EEE,IEC,CSA,AS as well as NEMA standards, The power ratings are up to 500 MVA and for volumes up o the highest insulation class of 1550 kV. There are a large number of project cases in North and South America, such as: 230kV power transformer in the United States, 115kV power transformer in Mexico, 66kV power transformer in Canada, 69kV, 110kV power transformer in Ecuador, etc. The local service team can provide installation, maintenance, after-sales guidance and other services for your transformer. Quick solution to your problem.
Daelim Transformer, a UL, cUL, and CSA certified power transformer manufacturer, adheres to global standards such as ANSI/IEEE/IEC/CSA/AS and NEMA. They offer transformers with ratings up to 500 MVA and voltage up to 345 kV. Daelim excels in providing innovative electrical transformer solutions, prioritizing safety and sustainability while meeting rigorous standards.
Each transformer is uniquely designed, considering factors like voltage, power rating, climate, and network topology. These solutions prioritize efficiency, eco-friendliness, high short-circuit strength, overload capacity, high-temperature operation, reliable startup during outages, and cost-effective maintenance. Their applications span renewable energy, urban substations, utilities, and industrial sectors.
At Daelim Transformer:
Daelim Transformer stands as a trusted partner, offering innovative and efficient power transformer solutions tailored to meet unique demands.
Design Tools : SOLIDWORKS(3D) / AUTOCAD
Equipment : 3F/2F/1F Multi-winding Transformer / Autotransformer
Standard: ANSI-IEEE /CSA/EN/BS/GOST/AS, IEC
Design: Sealed-tank system /Inert-gas pressure system or conservator-tank system without diaphragm; On load or no load voltage tap changer
Cooling system: ONAN/ONAF/ODAF/OFAF/OFWF/KNAN/KNAF
Insulation: Mineral Oil Inhibited I Not Inhibited I Vegetable oil
Primary voltage: Up to 345kV, up to 1550 kV BIL
Capacity: Up to 500 MVA Frequency: 50/60 HZ
Suitable for indoor and outdoor application.
Ambient temperature: – 50℃-40℃
Relative humidity: ambient air relative humidity should be below 93%，
Altitude: ≤1000m
Max wind speed:≤35 m/s
Earthquake acceleration: horizontal acceleration ≤0.3g
Vertical acceleration ≤0.15g
Special conditions: customized products are available.
Location: British Columbia, Canada
Quantity: 3 units Standards: IEEE & CSA
Special applications: Need to step down 66kV to 12.47kV, then connect to 4 units of 3MVA pad-mounted transformers to supply power for blockchain machines.
Accessories: Some of the accessories need to be explosion-proof, and customer have special requirements for gauges and valves.
Location: Nevada, USA
Quantity: 1 unit Standard: IEEE
The primary voltage is 230 kV, while the secondary voltage is 24.94 kV. This 230 kV transformer is capable of providing power ratings of 10 MVA, 12.5 MVA, and 15 MVA under various cooling methods.
It is designed with a KNAN/KNAF/KNAF configuration, and it utilizes vegetable oil as the insulating liquid.
Location: Australia Application: Solar Farm
Standards: AS & IEC Power rating: 12.5 MVA/15 MVA
Primary voltage: 66 kV Secondary voltage: 33000Y/19052V
Location: Quebec, Canada Application: 69 kV Substation
Standards: IEEE & CSA Power rating: 10000/13300kVA
Primary voltage: 69 kV Secondary voltage: 4.16 kV
Location: Guayaquil, Ecuador Application: Substation
Standards: IEEE Power rating: 40 MVA
High Voltage: 138 kV Low voltage: 34.5 kV
Location: NUEVO LEÓN Mexico Application: Substation
Standards: IEEE Power rating: 20 MVA
High Voltage: 115 kV Low voltage: 13.8 kV
Junction Box Fiber-optic temperature measurements
Neutral Terminals Other Moving Facilities (Wheels)
Rapid Rise Relay Nitrogen gas fluid preservation system
Electrostatic shield Special / low sound level Schrader Valve
Special environment Special paint for marine ambient Gas Test Valve
Line Dissolved Gas Monitor Bushing Mounted Current Transformers
Fire Prevention System (SERGl) On-line monitoring system
High ambient designs available High elevation designs available
Insulating oil: Natural ester( FR3 Enviro Temp, RAPO etc) Fans
Cooling: ONAN/ONAF, KNAN, KNAN/KNAF Frequency: 50 Hertz
Average winding rise: 55°C or 55/65°C Future fan wiring and control
Automatic pressure relief device Galvanized or stainless-steel radiators
Accessories with additional contacts Controls Cabinet: NEMA 3R, 4, 4X
Customizable Colors Harmonic allowances up to k-20
Station Class Seismic designs: Zones 1-4
HV lightning arresters: Distribution Class, Intermediate Class
Capacity range: Through 60 MVA (ONAN), with high-voltage ratings through 230 kV (900 kV BIL)
Service Location: Outdoor Coils: Cylindrical construction;
Core: Regular grain-oriented; mitered cruciform with step-lap construction
all copper windings; custom tempered per design requirements; circular windings with rectangular or continuously-transposed conductor; helical low-voltage windings; continuous disc medium-voltage windings; shielded disc high-voltage windings Radiators: Detachable panel type with shut-off valves, mild steel
Insulating oil: Mineral oil type I & type Il Tank Cover: Welded, Bolted
Manholes: On cover or tank Tank Base: Flat bottom or Skid under base
Tank Material: Mid Steel Frequency: 60 Hertz
Winding Tem rise: 55C
HV Taps: DETC, ETC in the tank or out
– Above rated volts: 2 x 2-1/2% offload taps of full capacity
– Below rated volts: 2 x 2-1/2% offload taps of full capacity
Valve: Drain and Filter Valves, w/Sampler Lifting, Moving, and Jacking Facilities
Pressure relief valve Magnetic oi-level indicator
Dial-type oil temperature indicator Dial-type winding temperature indicator
Dial-type sudden pressure relay Pressure vacuum gauge
Paint: Exterior polyurethane enamel， ANSI 70 gray color; interior polyurethane enamel, white color
HV bushing: IEEE segment 1-4, on the top cover or in the Air Terminal Chamber.
Porcelain Condenser, Solid Bulk.Solid Dielectric, Quick link
LV bushing: IEEE segment 1-4, Cover mounted or in Air Terminal Chamber Porcelain Condenser, Solid Bulk. Solid Dielectric, Quick link
Diagrammatic nameplate, engraved stainless steel
Transformer lifting lugs Tank grounding pads
Routine tests, also known as factory tests, are essential for ensuring the quality of every transformer. These tests include:
Type Tests
Type tests verify if a transformer meets specified standards and whether products of the same type or series meet these standards. Type test items include:
Special Tests
Special tests are conducted as mutually agreed upon by the manufacturer and the user. Special test items encompass:
Core Assembly:
The iron core consists of cold-rolled, granular-oriented silicon steel sheets known for their low loss and high magnetic conductivity. These sheets are structured in multiple steps with a complete tilt to minimize both loss and noise. Fixed clamps are applied to the iron core to enhance mechanical strength and reduce leakage losses. The addition of a PET banding structure further reduces noise and ensures the core column’s stability.
Coil Winding:
For the high-voltage (HV) winding, the adoption of an entanglement or inner-screened continuous design with a phase insulation structure guarantees robust insulating strength. The medium voltage (MV) and low voltage (LV) windings use high-strength conductors or conductor transposition and incorporate forced cooling to reduce temperature rise and enhance short-circuit resilience. The specific winding construction—whether interleaved, shielded disc, helical, disc, or layer—is selected based on voltage and impulse ratings.
Active Parts Assembly:
The assembly process for active parts involves cold pressing to ensure cleanliness and enhance the reliability of leads. Whole assembled phase insulation is utilized to expedite assembly and guarantee the precise dimension and shape of the insulation structure. High-voltage (HV) leads are fortified with specially molded insulation parts for protection, significantly improving insulating strength and reducing the risk of partial discharges.
Oil Tank:
The oil tank undergoes a three-dimensional finite element strength analysis and employs a Pro-E mold to strengthen its mechanical integrity. Welding methods incorporate automatic submerged arc welding, accompanied by ultrasonic fluorescence leakage testing to ensure a leak-free performance. Stringent quality control is maintained throughout the surface coating process.
Daelim Transformer collaborates with clients to understand their specific transformer requirements and tailors solutions accordingly. Once the exact needs are determined, the company’s engineers swiftly recommend the appropriate solutions.
The engineering team has the expertise to meet various performance requirements. This includes enhancing short-circuit strength, upgrading kVA ratings, adjusting voltages, reducing losses, modernizing LTC (Load Tap Changer), reducing sound levels, and modifying the transformer tank.
For technical inquiries, Daelim Transformer’s engineering team responds promptly to address questions from both clients and end-users.
Factory-to-Onsite Logistics Support:
The company provides logistical support for safe transportation, utilizing both ships and trucks. Impact recorders are employed to measure and store three-axis impact data, identifying any unusually severe impacts that could potentially damage the transformer during transportation.
On-Site Technical Assistance:
On-site technical support is available, covering assembly, oil treatment, testing, and commissioning (energization), and is conducted by an experienced engineer.
Training:
Factory specialists offer training on transformer operation and maintenance to ensure clients can effectively manage their equipment.
Repair:
Daelim Transformer’s technicians are capable of performing various repairs, such as replacing gaskets, broken bushings, and accessories. They can also purify or replace the oil, conduct sanding, priming, and repainting as needed. After repairs are completed, the unit undergoes comprehensive testing to ensure proper functionality.
Power transformers are typically high-voltage transformers known for their substantial size and weight. Daelim Transformer often disassembles various components of the transformer for transportation. The primary transformer unit is typically arranged for transport within an open-top container, while the disassembled components are securely packaged in wooden crates and transported using separate 20 ft/40 ft containers.
Throughout the packaging process, Daelim Transformer pays meticulous attention to numerous details. For example, the control box on the transformer unit is individually encased in a wooden crate to safeguard against potential impacts during transit. Moreover, a protective rain and sun cover is placed above the open-top container to ensure that the transformer unit remains shielded from rain, moisture, and corrosion during transportation.
We hold certifications such as UL, CE, and ISO, which attest to the safety and quality of our products. Additionally, our products comply with NEMA, ANSI C.57, DOE, and IEEE standards as applicable.
We operate our own transformer manufacturing facilities in both China and the United States, and we are fully capable of accommodating your custom requirements.
Typically, the production cycle for standard transformers ranges from 5 to 8 months. Actual delivery times depend on the complexity of the order, the quantity, and the destination.
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