2500 kVA Pad Mounted Transformer

The ZGSL-H-2500/13.2-0.6 transformer boasts a power rating of 2500 kVA (2.5 MVA). The 2500 kVA pad mounted transformer has a primary voltage rating of 13.2/7.62 kV with a Wye connection, high voltage H0 grounding, and a secondary voltage of 600Y/347V Wye with low voltage H0 grounding.

The ZGSL-H-2500/13.2-0.6 2500 kVA transformer is versatile, and suitable for both indoor and outdoor installation. These transformers are equipped with degradable vegetable oil insulating fluid and maintain a 65°C temperature rise. They come with 3 ELSP fuses and 3 bay-o-net fuses for protection, along with 3 high-voltage bushings, 3 elbow arresters(HV）， and four low-voltage bushings, each with 6 holes. The low-voltage terminal installation position is reinforced with a Padmount plate. Additionally, the 2500 kVA pad mounted  transformer features a four-position load-break switch and a five-position tap changer on the high-voltage side.

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What sets this 2500 kVA transformer apart is that its low voltage is designed to exit from the side. Furthermore, the gauges, tap changer, nameplate, pressure relief valve, and upper fill valve are all positioned on the exterior of the front cabin. These gauges are equipped with contacts and are connected within a NEMA 4 outdoor control box. A vacuum pressure gauge is located on the top of the front cabin. The high-voltage bushing is a porcelain integrated bushing with four holes, and the HV side is equipped with three lightning arresters, each of which provides an insulation cap to protect MV cables. Additionally, anti-condensation heaters are installed in the high-voltage front cabin for optimal performance.

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Remarkably, the customer procured six sets of these 2.5 MVA transformers in a single order. This transformer is designed for use in a dead-front system, without a load break switch. On the high-voltage side, it is equipped with six HV bushing wells, three bay-o-net fuses, a five-position tap changer, and arresters for enhanced safety.

On the low-voltage side, the transformer features four LV bushings with ten holes, gauges for monitoring, a fill plug, an upper fill valve, a pressure relief valve, and a drain valve, ensuring efficient and convenient operation.

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This 2.5 MVA transformer stands out as a unique and custom-engineered solution meticulously crafted by Daelim Transformer for a Canadian client. Notably, it boasts a design where both the high and low-voltage components are positioned on the mounting side, with the high-voltage section featuring a well-placed air terminal chamber extending to its base. The inclusion of instrument valves and strategically positioned accessories on the external fuel tank wall enhances accessibility and ensures added convenience, exemplifying the transformer’s thoughtfully engineered design.

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The 2550 kVA transformer employs the ONAN/ONAF cooling system, and therefore, it includes a set of fans. When operating in the ONAN cooling method, the transformer has a power rating of 2550 kVA. However, the ONAF cooling method can handle a higher power rating of 3300 kVA. Notably, the transformer is equipped with an oil temperature gauge with alarm contacts and is connected to a small 304 stainless steel control cabinet. This configuration allows for remote monitoring of the transformer’s operational status.

The ZGSL-H-2550/34.5/0.415 series comprises a total of four units, specially designed and manufactured for American customers, and is UL-listed to meet stringent safety and quality standards.

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On the low-voltage side, there is a bracket in the row to provide support for the terminal. The insulation liquid used is ASTM II mineral oil, with a capacity of 440 gallons. The tank is designed to withstand a maximum positive tank pressure of 10 PSI and a negative tank pressure of 8 PSI. The fluid level is maintained at 10.0 inches from the top of the hand hole at 25℃, with level changes of 0.4 inches per 10℃. The tank is designed for 7 PSI vacuum filling and is rated for 2550 kVA when energized at 11,847 volts with the tap changer in the 124,700-volt position for a secondary voltage of 415Y/240. These transformers contain no detectable levels of PCB (less than 2 ppm) at the time of manufacture, ensuring environmental safety and compliance.

The 2550 kVA transformer is a specially designed transformer that holds a UL listing, guaranteeing its compliance with rigorous safety and quality standards. The connection group for this transformer is Dy1·Dd0, offering two distinct connection methods for low voltage:

For a 4160V Wye connection, the terminals include X1B, X2B, X3B for phase connections, X1A, X2A, and X3A for neutral connections. For a 2400V Delta connection, the terminals are as follows: C1B to X2A, X2B to X3A, and X3B to X1A.

Daelim Transformer possesses robust design and production capabilities, making it possible to tailor and customize power transformers to suit your specific requirements.

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All 2550 kVA pad-mounted transformers in this series are built to meet the IEEE C57.12.34 standard, guaranteeing top-tier quality and performance. They feature a side-mount throat design for the low-voltage connection, allowing for seamless integration with switchgear. Additionally, the load-break switch for these 2550 kVA transformers is ingeniously designed within the low-pressure chamber of the front cabin, offering four positions for versatility. The tap changer provides five positions, and the pressure adjustment gear is set at 24.94±2×2.5% for precise control. The impedance of these transformers at 85°C is 5.87%, ensuring stable and efficient operation. Moreover, their high-voltage and low-voltage Basic Insulation Levels (BILs) are rated at 125kV and 30kV, respectively, to ensure robust insulation performance.

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