What is a new energy transformer?

"New energy" or renewable-energy transformers are specially engineered units for solar (PV) plants, wind farms, battery energy storage systems , EV charging infrastructure and distributed generation. They include: Step-up transformers ● that raise inverter output (e.g. 600 V–1,500 V DC side / low-voltage AC) to medium-voltage collection levels (e.g. 33–35 kV) Containerized or skid-mounted transformer stations ● that integrate transformer, switchgear and auxiliary systems in one transportable unit Green transformers ● using environmentally friendly insulating fluids (natural esters) and high-efficiency core designs

What is a pad-mounted transformer?

A pad-mounted transformer — often called a padmount or "box-type" transformer — is a ground-mounted distribution transformer enclosed in a locked steel cabinet installed on a concrete pad . It connects underground primary cables to underground secondary cables, which is why it is the standard solution for underground residential distribution (URD) and commercial underground power systems.

What is a dry-type transformer?

A dry-type transformer cools its windings with ambient air instead of liquid — it is also called an air-cooled or ventilated transformer. Enclosure vents allow air to flow over the core and coils. Because air is a less effective cooling medium than oil, dry-types run at higher average winding temperatures and use solid insulation such as aramid paper or cast resin instead of fluid.

What is an oil-immersed transformer?

An oil-immersed transformer — also called a liquid-filled, oil-filled transformer — uses dielectric fluid to cool, insulate and lubricate its internal components. The most common fluids are mineral oil, FR3 natural ester and silicone. Common configurations include pad-mounted, pole-mounted and substation transformers.

What is a distribution transformer?

A distribution transformer is the final voltage-conversion device between the utility distribution network and the end user. It steps down medium distribution voltage to the low voltage used by homes, businesses and industrial equipment (e.g. 120/240 V, 480 V, 600 V).

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Product Selection and Customization

Advanced Manufacturing Rooted in a Complete Industrial Ecosystem

Our advanced manufacturing factory operates at the heart of a full-category manufacturing ecosystem, giving us access to a complete supply chain — from raw materials and precision components to electrical testing equipment. This integrated ecosystem enables end-to-end production of pad mounted transformers, with strict quality control at every stage. Equipped with modern fabrication lines and professional testing facilities, we ensure every single phase and three phase pad mounted transformer meets international standards before delivery, providing reliable power solutions for residential, commercial, and industrial applications worldwide.

Factory Customization Services

We build single-phase and three-phase pad mounted transformers to order. Standard range: 25–2,500 kVA, primary voltage 15 kV, 25 kV or 35 kV, secondary voltage 120/240 V, 208Y/120 V or 480 V, 50 or 60 Hz. Custom options include impedance, off-circuit tap range (±2 × 2.5%), winding material, tank size, enclosure type, color/coating, bushings, load-break switches, fuses, and surge arresters. Units comply with ANSI/IEEE C57.12.20, C57.12.25, C57.12.26 and C57.12.38; UL certification available on request. Send your spec sheet or application details — our engineers return a full design with drawings and test data before production.

High Efficiency and Energy Saving

Low-loss design cuts operating cost. Amorphous metal cores reduce no-load loss sharply versus conventional silicon steel, and material selection keeps load loss low. Units meet DOE 2016 efficiency and are built ready for DOE 2029 levels; three-phase efficiency is typically 97.9–99.3%. Lower losses mean less wasted heat and lower electricity bills over the transformer's life, with the biggest savings in continuous or lightly loaded service.

Safety, Stability, and Low Maintenance

Dead-front, fully enclosed construction with lockable, tamper-resistant compartments prevents contact with live parts (ANSI/IEEE compliant). The hermetically sealed, corrosion-resistant tank with mineral oil or FR3 oil maintains stable dielectric and thermal performance. Every unit is factory tested: ratio, impedance, no-load and load loss, induced voltage, and dielectric. The sealed design needs no oil sampling or reconditioning — only routine visual inspection. Design life: 25–30 years.

Installation and Application Environment

The pad-mounted transformer is a versatile, field-proven solution for outdoor power distribution. Mounted on a concrete pad, it serves a wide range of applications-from residential communities and commercial complexes to rural networks and industrial sites -delivering steady, reliable performance across diverse climates. Its factory-integrated design enables rapid deployment and immediate commissioning with minimal on-site work. Engineered for safe, durable service, it only requires the installation site and surroundings to meet the following conditions:

Temperature Range
-40℃ ~ +55℃

Humidity Adaptation
0 ~ 100% RH

Seismic Resistance Level
IEC 60068-2-57

Altitude
≤3000m

Production Process

1.Drawing/Design Engineering

Define equipment functions and parameters based on customer requirements.

2.Raw Material Procurement & Incoming Inspection

Silicon steel sheets, copper wire, insulation materials, steel plates.

3.Core Manufacturing

Silicon steel cutting, and stacking.

4.Coil Winding

Automatic winding, interlayer insulation treatment.

5.Enclosure Fabrication

Enclosure welding and anti-rust treatment.

6.Insulation & Active Part Assembly

Insulation treatment, lead wire assembly.

7.Vacuum Drying & Varnish Impregnation

Vacuum dehumidification, varnish impregnation and curing.

8.Final Assembly

Enclosure and accessory installation, sealing test.

9.Factory Acceptance Inspection

Full routine tests.

Testing and Certification

Order Process

Customer Needs Analysis & Parameter Confirmation

Type, kVA, voltages, impedance, cooling, standard (IEC/IEEE/ANSI), qty, destination datasheet, drawings, lead time.

Order Confirmation

PI, contract, payment terms，OEM Details，brand logo, serial no., label language, local marks.

Stock Available in Warehouse?

In-Stock · Picking & Dispatch

Production & QC

Raw Material Inspection, Core Cutting & Stacking, Winding & Insulation, Vacuum Drying, Tank Fabrication & Assembly, Oil Filling & Treatment, Routine Tests, Type Tests , Inspection Reports, Test Certificates, FAT, QC Photos & Videos

Dispatch Preparation

Export Packing, Desiccant & Breather, Lifting Lugs & Skid Base, Shipping Marks, Packing List, Loading Plan & Photos, Cargo Survey, Insurance, Export Documents (Invoice, PL, CO), Customs Clearance, Booking Confirmation

Shipping

Transport Mode (Sea/Air/Rail/Road), Container & Vessel Loading, Fumigation Certificate, Bill of Lading, Shipping Advice, ETD/ETA, Incoterms (FOB/CIF/DDP), Onboard & Lashing Photos

Transport Tracking & Feedback

Vessel/Container Tracking, Voyage Monitoring, Port Discharge, Destination Customs Clearance, Arrival Notice, Status Updates, Delay/Issue Alerts, Customer Feedback, Claims Handling

Customer Receives Goods

Unloading & Visual Inspection, Checklist vs Packing List, Damage/Shortage Check, Photo Evidence, Delivery Receipt Sign-off, Storage Advice (Oil Level, Breather), Installation Readiness

Acceptance & After-Sales

Weilai Electric boasts a team of experienced engineers providing full-lifecycle support—ranging from transformer design consultation and technical drawings to on-site guidance and after-sales service—ensuring customer peace of mind at every stage of the project.

Specific services include: commissioning support, on-site testing (turns ratio, insulation, oil sample analysis), acceptance certification, warranty coverage, technical support, spare parts supply, maintenance guidance, handling of complaints and claims, and feedback management for long-term cooperation.

SUCCESS CASES

2+40sets transformers of Michigan Data Center Project

Project Overview: Large-scale data center project located in Michigan, USA. The power supply and distribution system adopts a high-reliability N+1/2N architecture. Main incoming transformers and dry-type distribution transformers serve as the core power supply equipment for the data center.

15 Sets Distribution Transformers for Municipal Engineering Projects in Rwanda

Construction of a supporting power system for municipal engineering projects in Rwanda.Construction Site: Rwanda, with an altitude of over 1500 meters and a mild and dry climate

14 oil-immersed transformers in a data center in Syria

oil-immersed transformers in a data center

FAQ

Q What is a new energy transformer?

A "New energy" or renewable-energy transformers are specially engineered units for solar (PV) plants, wind farms, battery energy storage systems , EV charging infrastructure and distributed generation. They include:
Step-up transformers
● that raise inverter output (e.g. 600 V–1,500 V DC side / low-voltage AC) to medium-voltage collection levels (e.g. 33–35 kV)
Containerized or skid-mounted transformer stations
● that integrate transformer, switchgear and auxiliary systems in one transportable unit
Green transformers
● using environmentally friendly insulating fluids (natural esters) and high-efficiency core designs
Q What is a pad-mounted transformer?

A A pad-mounted transformer — often called a padmount or "box-type" transformer — is a ground-mounted distribution transformer enclosed in a locked steel cabinet installed on a concrete pad. It connects underground primary cables to underground secondary cables, which is why it is the standard solution for underground residential distribution (URD) and commercial underground power systems.
Q What is a dry-type transformer?

A A dry-type transformer cools its windings with ambient air instead of liquid — it is also called an air-cooled or ventilated transformer. Enclosure vents allow air to flow over the core and coils. Because air is a less effective cooling medium than oil, dry-types run at higher average winding temperatures and use solid insulation such as aramid paper or cast resin instead of fluid.
Q What is an oil-immersed transformer?

A An oil-immersed transformer — also called a liquid-filled, oil-filled transformer — uses dielectric fluid to cool, insulate and lubricate its internal components. The most common fluids are mineral oil, FR3 natural ester and silicone. Common configurations include pad-mounted, pole-mounted and substation transformers.
Q What is a distribution transformer?

A A distribution transformer is the final voltage-conversion device between the utility distribution network and the end user. It steps down medium distribution voltage to the low voltage used by homes, businesses and industrial equipment (e.g. 120/240 V, 480 V, 600 V).

The Group's core businesses cover high-end manufacturing and industrial fields such as chemical products, transformers, and electrical equipment, with transformers and other electrical equipment being the Group's strategic leading industries.

PRODUCTS

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CONTACTS

Tel: +86-18356911563

Add: Shunhua Road Subdistrict, Lixia District, Jinan City, Shandong Province

Opening Hours：

work every day 9:00–18:00

Transformers

Transformers

All Products

Product Selection and Customization

Advanced Manufacturing Rooted in a Complete Industrial Ecosystem

Factory Customization Services

High Efficiency and Energy Saving

Safety, Stability, and Low Maintenance

Installation and Application Environment

Production Process

Order Process

Stock Available in Warehouse?

In-Stock · Picking & Dispatch

Production & QC

Dispatch Preparation

Shipping

Transport Tracking & Feedback

Customer Receives Goods

Acceptance & After-Sales

FAQ

Q What is a new energy transformer?

Q What is a pad-mounted transformer?

Q What is a dry-type transformer?

Q What is an oil-immersed transformer?

Q What is a distribution transformer?

PRODUCTS

QUICK LINKS

CONTACTS