75kva 34.5kv to 240v/480v single phase Oil Immersed Transformer

75kva 34.5kv to 240v/480v single phase Oil Immersed Transformer

1. Product Description

The 75kVA 34.5kV to 240V/480V single phase oil immersed transformer is a standard ANSI/CSA-certified single-phase distribution transformer designed exclusively for North American 34.5kV medium-voltage utility power grids. As a popular mid-capacity oil-filled step-down transformer widely used in rural, suburban and commercial outdoor power distribution systems, this 34.5kV single phase oil immersed transformer specializes in converting high 34.5kV overhead line voltage into stable dual 240V and 480V single-phase low-voltage output. It perfectly matches the power demands of light industrial machinery, medium-sized commercial equipment and high-power residential electrical systems, complying fully with North American electrical code requirements and DOE energy efficiency guidelines.

Built with premium low-loss grain-oriented silicon steel core and high-purity copper winding coils, the 75kVA single phase 34.5kV to 240V/480V oil immersed power transformer effectively minimizes no-load excitation loss and restricts temperature rise during continuous rated-load operation. Adopting a fully sealed welded steel tank structure and conventional ONAN oil natural air natural cooling system, this oil filled distribution transformer uses PCB-free mineral insulating oil for insulation and heat dissipation, completely shielding internal core and windings from outdoor moisture, dust and oxidative corrosion. Supporting both pole-mounted and pad-mounted installation, this durable single-phase power transformation equipment balances energy-saving performance, operational stability and cost efficiency, serving as a reliable mainstream solution for daily power distribution and grid renovation projects in 34.5kV single-phase power networks.

2. Technical Parameters

3. Core Purpose

The core purpose of the 75kVA 34.5kV to 240V/480V single phase oil immersed transformer is to provide stable, energy-efficient and safe medium-capacity voltage step-down conversion for 34.5kV medium-voltage single-phase power distribution grids. This practical oil-filled single-phase step-down transformer bridges the voltage gap between high-voltage overhead transmission lines and medium single-phase end loads, converting fluctuating 34.5kV grid voltage into standardized 240V and 480V dual low-voltage power that fully complies with North American commercial and light industrial power supply specifications.

In routine utility grid operation, this single phase oil immersed distribution transformer undertakes multiple essential grid protection and regulation functions, including terminal voltage stabilization, load harmonic suppression, three-phase grid balance assistance and circuit safety isolation. It maintains consistent dual 240V/480V output under dynamic medium load changes, effectively preventing voltage drop, current surge and electrical equipment damage caused by insufficient power transformation capacity. Designed for universal medium single-phase power consumption scenarios, it optimizes power supply reliability for suburban and rural 34.5kV power grids, reduces long-term grid operation loss, and delivers continuous stable power guarantee for medium-load civilian and light industrial electrical equipment.

4. Application Scenarios

Featuring moderate 75kVA rated capacity, reliable load adaptability and superior outdoor weather resistance, the 75kVA 34.5kV/240V/480V single phase oil immersed power transformer is widely deployed in mainstream medium-load single-phase power supply scenarios across North American utility networks. It serves as the standard supporting equipment for daily grid operation, renovation and commercial supporting power projects:

• Medium-power Residential Power Supply: Ideal for suburban high-end villa clusters and centralized rural high-power households. The 480V high-voltage single-phase output supports high-power household equipment and intelligent building systems, while 240V output meets daily lighting and conventional electrical load demands, fully adapting to North American high-standard residential power consumption habits.

• Light Industrial Single-phase Distribution: Widely applied in small mechanical processing workshops, woodworking factories, equipment maintenance stations and mini light industrial parks. It provides long-term stable power supply for medium-power single-phase industrial machinery, avoiding production interruption caused by power instability.

• Small & Medium Commercial Facilities: Suitable for suburban retail centers, community supermarkets, street office buildings and public service outlets. It reliably supports commercial refrigeration systems, office electrical devices and public facility equipment operation with stable power quality.

• 34.5kV Rural & Suburban Grid Upgrading: Used for old 34.5kV medium-voltage power grid reconstruction and capacity expansion, replacing outdated high-loss low-capacity transformers to improve regional power supply capacity and reduce overall grid energy consumption.

• Remote Outdoor Facility Power Supply: Adaptable for highway service stations, scenic area supporting facilities, field monitoring bases and remote communication base stations. Its excellent all-weather outdoor performance supports long-term unattended power supply in remote areas lacking manual maintenance conditions.

• Small Distributed New Energy Grid Connection: Matched with medium-sized residential rooftop photovoltaic power generation systems, completing stable voltage conversion and grid-connected power regulation for decentralized new energy equipment to ensure grid power quality and safe grid access.

5. Product Features

This 75kVA 34.5kV to 240V/480V single phase oil immersed transformer adopts mature ANSI-standard manufacturing technology and upgraded energy-saving optimization design. With balanced capacity, stable performance and strong environmental adaptability, it fills the market gap between small-capacity and high-capacity single-phase transformers, fully adapting to complex outdoor operating conditions of modern 34.5kV medium-voltage power grids:

• Balanced Capacity & Reliable Overload Resistance: With 75kVA moderate rated capacity, this single-phase oil immersed transformer perfectly matches medium single-phase load demands, avoiding insufficient capacity of small transformers and idle energy waste of large-capacity models. It maintains stable operation under long-term rated load and short-term peak overload conditions, with low tripping and burnout failure rates.

• Low Loss & High Energy-saving Efficiency: Equipped with high-permeability low-loss silicon steel core and high-purity copper winding structure, the equipment greatly reduces no-load magnetic loss and load copper loss. All loss indicators meet DOE premium energy efficiency standards, effectively lowering long-term grid operation energy consumption and reducing daily operational costs for power supply enterprises.

• Precise Dual 240V/480V Voltage Output: Optimized professional single-phase winding layout ensures accurate and balanced dual low-voltage output. The built-in multi-grade off-circuit tap changer flexibly adapts to regional 34.5kV grid voltage deviation, effectively suppressing grid harmonic interference and voltage fluctuation to guarantee qualified and stable terminal power quality.

• Fully Sealed Structure & Anti-aging Performance: Integral fully sealed welded steel tank completely isolates internal core, windings and insulating oil from external humid air, dust and corrosive substances. It prevents insulating oil aging, moisture ingress and internal insulation degradation, eliminating common oil leakage faults of traditional open-type transformers and extending overall service life.

• All-weather Outdoor Weather Resistance: The whole machine adopts high weather-resistant anti-corrosion electrostatic spraying process, resisting ultraviolet aging, rain erosion, frost and snow damage, wind and sand impact. It can operate stably in high temperature, low temperature, high humidity and dusty harsh outdoor environments throughout the year.

• Flexible Installation & Low Maintenance Cost: Compact and reasonable structural design supports both pole-mounted and pad-mounted installation, adapting to various field terrain and construction conditions. The fully sealed design requires no frequent oil replacement and complex daily maintenance, greatly simplifying routine inspection work and reducing long-term operation and maintenance expenses.

6. FAQ (Frequently Asked Questions)

Q1: Why choose 75kVA 34.5kV 240/480V single phase oil immersed transformer for medium-load distribution?

The 75kVA single phase oil immersed transformer is the most cost-effective mid-capacity model for 34.5kV single-phase power grid medium-load scenarios. Compared with 50kVA and 37.5kVA small-capacity transformers, it has stronger overload tolerance and more stable peak load operation, which can fully meet medium commercial and light industrial power demands without frequent overheating protection. Compared with oversized 100kVA or 167kVA models, it avoids excessive no-load loss and resource waste in conventional medium-load operation. Its standard 240V/480V dual output design is highly compatible with North American medium-power single-phase equipment, making it the most balanced choice for suburban and rural medium-load power distribution projects.

Q2: Can this 34.5kV single phase oil immersed transformer adapt to long-term outdoor unattended operation?

Absolutely. This ANSI-certified 75kVA oil immersed distribution transformer is specially optimized for outdoor unattended utility working conditions. The fully sealed integral steel tank structure completely prevents internal insulation damp, insulating oil deterioration and dust accumulation caused by long-term outdoor exposure. The high-strength weather-resistant and anti-corrosion shell can resist extreme weather impacts including high-temperature aging, low-temperature freezing, heavy rain erosion and strong wind sand. The mature ONAN self-cooling system ensures stable heat dissipation under continuous rated load, supporting 24-hour uninterrupted all-weather stable operation and fully meeting long-term unattended outdoor power distribution requirements.

Q3: What routine maintenance is required for a 75kVA 34.5kV single phase oil immersed transformer?

This medium-capacity single-phase oil immersed transformer features low maintenance threshold and stable long-term operational performance. Daily routine work mainly includes visual inspection of oil tank welding seams and sealing points to check for oil leakage, and confirmation that insulating oil level and oil clarity are within standard range. Operators need to clean radiator surface dust and debris regularly to ensure unobstructed heat dissipation and prevent equipment overheating faults under continuous load. It is necessary to periodically test winding insulation resistance and terminal voltage balance, and check the tightness of high and low voltage wiring terminals. Avoid long-term overload operation in daily use. With standardized simple maintenance, the equipment service life can stably reach more than 20 years.