APPLICATION

Utility Applications

01-14 2026 | By:

Dry-Type, Oil-Immersed Transformers & Prefabricated Substations

Reliable electricity delivery starts with world-class transformer solutions. ZTelec Yuguang offers advanced dry-type resin transformers up to 35kV, oil-immersed power transformers up to 110kV, and prefabricated compact substations (also called box-type / containerized substations) up to 35kV. Our products are engineered for modern utility networks, industrial infrastructure, and critical power systems around the globe.

Transformers & Compact Substations for Utility Networks

In utility applications, transformer solutions must deliver efficient voltage transformation, superior reliability, and long service life under demanding service conditions. ZTelec Yuguang provides comprehensive solutions for:

Distribution networks
Transmission systems
Renewable energy grid integration
Urban infrastructure
Industrial facilities and campuses
Data center power distribution
EPC utility turnkey projects

Our transformer systems support efficient power flow while minimizing losses, ensuring safe operation, and reducing maintenance costs.

Power Transformer Categories

⚡ Dry-Type Resin Transformers (Up to 35kV)

Three Phase Dry Type Transformer

Dry-type transformers with epoxy resin encapsulation provide:

High fire safety and low pollutant risk
Excellent performance for indoor, rooftop, and urban environments
Low maintenance and enhanced personnel safety

Typical use cases:

Indoor distribution substations
Commercial and industrial power systems
Public buildings, hospitals, schools

🔥Oil-Immersed Power Transformers (Up to 110kV)

Oil-immersed transformers with robust insulation and cooling systems deliver:

High voltage capability for transmission and distribution
Strong thermal stability under full load
Flexible tap changer options for grid adaptation

Typical use cases:

Outdoor utility substations
Grid transmission step-up stations
High-load industrial power networks

📦 Prefabricated Compact Substations (Up to 35kV)

Also known as box-type / containerized / compact substations, these units integrate:

MV transformer
MV switchgear
LV distribution
Protection & control panels
Metering and monitoring equipment
Outdoor rated enclosure and civil foundation accessories

Perfect for utility distribution points, solar/wind farm collector stations, commercial parks, and infrastructure sites where space, safety, and installation speed matter.

Compact Sub Stations (CSS)

Application Scenarios

ZTelec Yuguang solutions are designed for a wide range of applications:

✔ Utility power distribution networks
✔ Grid substations and transmission hubs
✔ Renewable energy integration (solar & wind)
✔ Factory and process plants
✔ Commercial and residential complexes
✔ EPC and turnkey power infrastructure projects
✔ Urban expansion & smart grid deployments

Our designs conform to global practices and meet strict quality, safety, and performance standards.

Technical Specifications

Dry-Type Resin Transformers (Up to 35kV)

Parameter	Specification
Transformer Type	Dry-Type Resin (Encapsulated)
Voltage Rating	Up to 35kV
Capacity Range	100 kVA – 15 MVA (customizable)
Phase	Three-Phase
Frequency	50 / 60 Hz
Cooling	AN / AF
Insulation	Epoxy Resin
Impedance	4% – 8%
Operating Temp	–25°C to +50°C
Altitude	≤ 1000 m (higher optional)
Protection	IP23 / IP44
Standards	IEC 60076-11, IEEE C57.13

Oil-Immersed Power Transformers (Up to 110kV)

Parameter	Specification
Transformer Type	Oil-Immersed Power Transformer
Voltage Rating	Up to 110kV
Capacity Range	1 MVA – 200 MVA (custom)
Phase	Three-Phase
Frequency	50 / 60 Hz
Cooling	ONAN / ONAF
Vector Group	Dyn11 / YNd11 / Custom
Impedance	8% – 14%
Insulation Fluid	Mineral Oil or FR3 Biodegradable Fluid
Tap Changer	On-Load / Off-Load
Ambient Temp	–30°C to +50°C
Altitude	≤ 1000 m

Prefabricated Compact Substation (Up to 35kV)

Feature	Detail
System Type	Prefabricated / Box-Type / Container Substation
Voltage Class	Up to 35kV
Integration	Transformer + MV Switchgear + LV Distribution
Capacity	500 kVA – 15 MVA (standard)
Enclosure	Outdoor rated steel / corrosion resistant
Protection	IEC / ANSI Protection sets
Monitoring	Optional Remote SCADA / RTU
Installation	Plug-and-play modular design

Key Features & Benefits

Dry-Type Resin Transformers

✔ Safe for indoor use with fire-resistant insulation
✔ Minimal maintenance and environmental impact
✔ Excellent dielectric performance

Oil-Immersed Transformers

✔ High voltage capability up to 110kV
✔ Efficient cooling and thermal performance
✔ High short-circuit strength and grid adaptability

Prefabricated Substations

✔ Modular turn-key solution
✔ Reduced civil cost and onsite installation time
✔ Integrated protection & monitoring possible

All ZTelec Yuguang products undergo rigorous factory acceptance testing, including winding resistance, dielectric, temperature rise, and full load validation — ensuring quality and reliability.