1500 kVA Ansi C57 12.34 Transformer-23/0.44 kV | Salvador 2025

Durable and energy-efficient, the Three Phase Pad Mounted Transformer empowers the modern grid!

01 General

1.1 Project Description

The 1500 kVA three-phase pad-mounted transformer delivered to Salvador in 2025 looks straightforward on paper-23 kV Delta, 0.44/0.254 kV secondary, Dyn1, ONAN cooling, NLTC ±2×2.5%. But the real story is never the numbers. It’s how the transformer is actually used, and what customers quietly worry about long before installation day. Sites are tight. Sometimes urban, sometimes industrial, sometimes just a small concrete pad squeezed between two buildings. Heat, humidity, salt fog-weather keeps changing, but expectations do not: the transformer must be safe, must be sealed, must not surprise anyone during operation. Loads jump around too. Commercial peaks, industrial starting currents, mixed residential demand-all asking for stable voltage and a unit that doesn’t flinch. And of course, customers want something that lasts: no overheating, no corrosion, no expensive maintenance every few months. That’s why this unit comes with copper windings for better conductivity and thermal endurance, bayonet fuses for overcurrent protection, and ELSP fuses to limit fault currents before they cause trouble. Everything built under IEEE C57.12.34-2022, so integration with the local grid stays simple.

1.2 Technical Specification

1500 kVA ansi c57 12.34 transformer specifications type and data sheet

1.3 Drawings

1500 kVA ansi c57 12.34 transformer diagram drawing and size.

1.4 Technical Highlights

	Copper Windings High conductivity, heat and overload resistant, improving efficiency and extending service life
	High-Efficiency Loss Design No-load loss of 1.97 kW and load loss of 16 kW, reducing long-term operating costs
	Safety & Protection Features Includes ELSP and bayonet fuses for enhanced operational safety

02 Manufacturing

2.1 Core

The ansi c57 12.34 transformer features a three-phase three-column core design with three independent columns, each uniformly distributing windings to ensure balanced three-phase power. This design optimizes magnetic flux utilization, reduces losses, and lowers electromagnetic noise and vibration, thereby improving the operating environment. Additionally, it allows for air circulation, enhancing heat dissipation and durability, while also being able to withstand mechanical stress during short circuits, increasing safety.

2.2 Winding

The low-voltage winding utilizes a foil conductor with a large surface area, effectively reducing resistance and losses, thereby enhancing efficiency. In contrast, the high-voltage winding employs wire winding made of materials with good insulation properties to meet high-voltage requirements. This combined design offers advantages such as reduced leakage and electromagnetic interference from the low-voltage foil winding, while improving heat dissipation; the high-voltage wire winding ensures safety and stability under high-voltage conditions, enhancing the equipment’s adaptability to load fluctuations and short-circuit situations.

2.3 Tank

The manufacturing process of the oil tank for the three-phase box transformer includes selecting high-quality mild steel plates, followed by precise cutting and welding to ensure the sealing and strength of the welds. After that, the surface is cleaned and coated with a primer to enhance adhesion and corrosion resistance, followed by a topcoat to improve weather resistance. After multiple layers of coating and drying, air-tightness and pressure tests are conducted to confirm the safety of the oil tank under high-pressure conditions. This series of processes ensures that the oil tank provides excellent protective performance and extends the service life of the transformer.

2.4 10-Hole Bushings With Support Frame

Low-voltage 10-hole bushings with support frame, designed for easy wiring and flexible connections; makes installation straightforward, saves time, reduces complexity. The support frame adds mechanical strength, keeps bushings stable even under vibration or heavy load; helps prevent misalignment, ensures long-term reliable operation. Easy to inspect, simple to maintain, works well in harsh environments, providing a secure and durable interface for low-voltage connections.

03 Testing

04 Packing and Shipping

05 Customization Capabilities

Our ansi c57 12.34 transformer aren’t just “one-size-fits-all.” They’re built to adapt, to flex, to fit the way you actually run your network-whether utility, industrial, or commercial. Almost everything can be tailored, from the electrical specs to mechanical layout, cooling, and protective devices.

Electrical & Performance Options

Rated Power: 45 kVA up to 10,000 kVA

High Voltage: up to 46 kV

Frequency: 50 Hz or 60 Hz

Vector Groups: YNyn0, YNd11, Dyn11, and others

Feed Configurations: radial or loop-feed

BIL Ratings: HV 45–150 kV (Dead Front), 200 kV (Live Front); LV 30–60 kV

Winding & Cooling Customization

Cooling Types: ONAN, ONAN(F), KNAN(F), LNAN(F) available on request

High-Voltage & Low-Voltage Winding Materials: copper or aluminum

Voltage Taps & Tap Changers: NLTC, delta-wye switch, dual-voltage switch

Mechanical & Terminal Options

HV Terminals: dead-front or live-front

LV Terminals: standard flange or custom bus connections

Switch Configurations: LBOR switch (2 or 4 positions), V-blade, T-blade

Accessories: elbow arrester, hot-dip galvanized radiators, winding temperature indicators

Protection & Monitoring

Fuses: bayonet fuse, ELSP fuse, VFI fuse

Additional Monitoring Devices: oil level gauge, temperature gauge, pressure-vacuum gauge, pressure relief devices, gas sampling ports

With these customization options, our transformers can be tailored to meet specific environmental conditions, safety requirements, load profiles, and operational preferences-ensuring maximum reliability, efficiency, and long-term performance for any power distribution project.