750 KVA Step Down Transformer

Built to the customer’s Specifications

A 750 kVA step-down transformer is a critical piece of electrical equipment. It lowers high-voltage power from a utility grid for use by commercial, industrial, and large residential consumers. These are typically three-phase distribution transformers, though single-phase options are available. The 750 kVA capacity is suitable for facilities with substantial power requirements. Depending on the specific application, they are often available as dry-type or liquid-filled models.

Applications

Large commercial buildings and office complexes use these transformers. They power HVAC systems, lighting, and other electrical infrastructure. Industrial facilities and manufacturing plants rely on them for heavy machinery and equipment. Municipal substations and urban power distribution networks utilize these units. They are also found in renewable energy projects, such as solar farms and battery energy storage systems (BESS). Data centers, hospitals, and educational institutions also use them for centralized power.

Features and Benefits

This transformer offers high reliability and durability for long-term performance. It often features a robust, tamper-resistant housing for safety and security. High energy efficiency is a key benefit, reducing operating costs and heat waste. Dry-type models offer fire and explosion protection since they do not use flammable liquid. Liquid-filled (oil-immersed) versions provide excellent cooling for enhanced performance. Low noise levels are a feature on some models. A tap changer is often included for minor voltage adjustments. Winding material is typically either aluminum or copper. High elbow surge arresters offer over-voltage and transient protection.

Specifications

Power Rating: 750 kVA.
Phase: Three-phase is standard, but single-phase is also available.
Primary Voltage: Common options include 13200V or 480V Delta. Other voltages may be specified.
Secondary Voltage: Common options include 480Y/277V or 208Y/120V Wye. Other voltages may be specified.
Cooling Method: Options include natural air (AN) for dry-type and natural convection (ONAN) for liquid-filled.
Windings: Windings can be made from either aluminum or copper.
Enclosure Rating: Varies depending on application. NEMA 2 for indoor and NEMA 3R for outdoor dry-type are common. Liquid-filled padmount versions often have compartmental designs.
Efficiency: Units often meet or exceed US Department of Energy (DOE) and Canadian (NRCan) efficiency standards.
Insulation: A 220°C insulation system is common for dry-type units. Liquid-filled versions use mineral oil or biodegradable vegetable oil ester fluid.
Temperature Rise: A 150°C temperature rise is typical for dry-type units. A 65°C rise is common for liquid-filled versions.

Mating Products

Fuses and circuit breakers provide essential upstream overcurrent protection. Primary and secondary cables connect the transformer to both the grid and the load. High-voltage (HV) elbow connectors consequently terminate the incoming primary lines. Operators typically use standard NEMA two-hole lugs for terminals. Control boxes or cabinets house monitoring gauges; these track oil level, temperature, and pressure. A pad-lockable enclosure and hinged doors offer secure access.

Compatible Devices

Panelboards and switchgear distribute power from the transformer to various circuits. Therefore, heavy motors, compressors, and industrial machinery commonly connect to the transformer. Similarly, commercial HVAC systems are compatible. Users can also power integrated lighting systems with this transformer. Furthermore, battery energy storage systems (BESS) and backup generators can connect to it. Finally, network switches and routers draw power through a distribution system linked to the transformer.

Certifications and Compliance

Panelboards and switchgear distribute electricity from the transformer to different circuits. As a result, heavy motors, compressors, and industrial equipment are frequently connected to the transformer. Commercial HVAC systems are also compatible with it. Additionally, integrated lighting systems can be powered by this transformer. Battery energy storage systems (BESS) and backup generators can likewise be connected. Lastly, network switches and routers receive power through a distribution system linked to the transformer.
A 750 kVA transformer typically holds certifications and adheres to various standards. UL and cUL listings are common for units marketed in North America. CSA certification is often necessary in Canada. Compliance with ANSI and IEEE C57 standards guarantees manufacturing quality and performance. IEC standards may also apply. Many modern units meet DOE 2016 and NRCan efficiency standards. Seismic qualifications are verified through compliance with standards such as CBC or IBC. Some units bear CE marks for sale within Europe.