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!
Primary Voltage Ratings: 69,000V
Secondary Voltage Ratings: 4,160Y/2,400V
H.V. TAP RANGE: 69kV± 2 x 2.5%
CONNECTION TYPE: Dyn1
TYPE: Three phase oil type
BIL: 350/75kV
Standards: IEEE
Application: Substation in PA
Power Rating: 4200 kVA/5250 kVA
Cooling Method: ONAN/ONAF
In June 2024, Daelim Transformer delivered a 69kV 3-phase power transformer to a customer in the United States for application in a substation in Pennsylvania. This transformer features a high voltage rating of 69kV and a low voltage of 4.16Y/2.4kV. It is designed to operate within an ambient temperature range of -40°C to 40°C. The following image shows the completed installation sent by the end user, with the transformer currently in operation.
| 69kV 4200kVA 5250kVA Transformer Technical Specifications | |
| POWER RATING | 4200/5250kVA |
| RATINGPRIMARY VOLTAGE | 69,000V |
| SECONDARY VOLTAGE | 4,160Y/2,400 |
| FREQUENCY | 60Hz |
| VECTOR GROUP | Dyn1 |
| WINDING MATERIAL | COPPER |
| LOAD LOSS | 7.5KW |
| NO LOAD LOSSES | 30KW |
| IMPEDANCE | 8.5% AT 5,250kVA |
| ALTITUDE | ≤1000m |
| COLOR | ANSI 70 GREY |
| INSULATING OIL WEIGHT | 1,100 GAL |
| TOTAL WEIGHT | 25,900 LBS |
Contact Daelim Transformer for special requirements
| 69kV 4200kVA 5250kVA Transformer Accessories | |
| V bushing 15kV 1767A | Control box |
| H bushing 72.5kV 630A | Ground pads |
| Magnetic oil gauge | Cooling radiators; Fans |
| Core grounding bushing | Drain valve |
| Manhole for access to interior | Pressure vacuum gauge |
| Off-load tap changer | Top oil thermo |
| Transformer lifting lugs | Pressure relief device |
| Nameplate | LV 6Kv station class ploymer lightning arresters |
| Cover lifting lugs | HV 72Kv station class ploymer lightning arresters |
Learn more: 69 kV Power Transformer for Substation in Pennsylvania
Core Features
The transformer meets all relevant IEEE standards, ensuring reliable and safe operation in accordance with international electrical norms.
The design incorporates advanced 3D simulation and electromagnetic analysis to optimize performance. This ensures high operational reliability and efficiency.
The transformer features low partial discharge, minimal noise, low losses, and a high short-circuit withstand capability, contributing to long-term reliability and energy efficiency.
The sleek, modern aesthetic minimizes space usage and simplifies installation, making the transformer an ideal solution for environments where space is limited.
The 69kV 4200/5250kVA power transformer is equipped with both high- and low-voltage lightning arresters, providing effective protection against lightning strikes and overvoltage events. Key benefits include:
Lightning arresters prevent damage to the transformer and related power equipment from lightning strikes.
The lightning arresters reduce overvoltage, safeguarding electrical equipment and ensuring system stability.
By protecting the transformer’s insulation system, the lightning arresters help extend the transformer’s service life and reduce the likelihood of premature failures.
The lightning protection system enhances overall system reliability and reduces both maintenance needs and operational disruptions.
This transformer is equipped with an advanced air cooling system for efficient temperature regulation. The system ensures that the transformer operates within a safe and optimal temperature range, improving both its operational efficiency and lifespan.
The transformer operates at a rated capacity of 4200kVA. The capacity can be increased to 5250kVA with the activation of the cooling fan.
A fan powered by a 120V supply is installed on the transformer’s radiator. The fan operates based on temperature readings from the top oil thermometer:
The cooling system automatically adjusts its operation according to the transformer’s load and temperature, optimizing energy efficiency and cooling performance.
The 69kV 4200/5250kVA transformer is equipped with a no-load tap changer on the high-voltage side, adjustable in five steps within a range of 69kV ± 2 x 2.5%. This feature allows the transformer to adapt to fluctuations in the local grid voltage caused by seasonal and load variations, ensuring a stable and high-quality power supply.
Given the dimensions of the transformer (3.6 meters in height and 3 meters in depth), an efficient transportation plan was required. To achieve the most economical shipping solution, the transformer was packaged in disassembled sections.
Key components such as the high-voltage bushings, lightning arresters, radiator, and fan were disassembled and individually packed in wooden boxes. The transformer body itself was also secured in a wooden crate.
The disassembled components were shipped in a 40H container, which meets the transportation requirements. The transformer was securely fixed inside the container using straps and wooden supports. Additionally, the top of the container was covered with a rainproof cloth to protect the transformer from environmental factors such as rain, dust, and storm during transit.
Daelim Transformer ensures the safe, reliable, and efficient delivery of all transformers, with careful attention paid to packaging, transportation, and handling.
With over 20 years of experience in transformer export, Daelim Transformer is a trusted partner in providing high-quality, reliable, and compliant power solutions. Our expertise in international standards, along with our professional handling of special technical requirements, packaging, and transportation, guarantees the safe and timely delivery of transformers that meet the highest standards of performance and reliability.
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