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Certified transformers (≤35kV), smart substations & PV-storage systems — engineered with 9 patents. Precision-built for renewable integration and grid reliability. Request specs
Application scenario
Designed for Critical Power Infrastructure
Whether used in EPC projects or grid upgrades, our transformers deliver reliability, high efficiency, and compliance with international standards.
Industrial Plants
Residential Communities
Urban Distribution Networks
Power Grid Projects
Solar PV Systems
Product Features
Key Features of This Product Line
Built for industrial and utility-scale applications, our products feature high-quality materials, low energy loss, and robust insulation. Each unit is designed and tested to GB/IEC standards, with support for custom voltage levels, tap changers, and protection grades. From core processing to final testing, we ensure long-term reliability and project-specific adaptability.
On-load / off-load tap changers
Transformer ratings up to 35kV
Cabinet design & layout drawings
Site-matching size & interface
Customized cooling / protection level
PV inverter integration & full pre-wiring
Available Models & Technical Specifications
Available Models & Technical Specifications
| Item | Unit | Specification |
|---|---|---|
| Rated Voltage | V | 400 |
| Rated Frequency | Hz | 50 / 60 |
| Transformer Capacity Options | kVA | 10 / 20 / 30 / 50 / 63 / 80 / 100 / 125 / 160 / 200 / 250 / 315 / 400 |
| Capacitor Groups | Levels | 2 / 3 / 4 / 5 (customizable) |
| Feeder Circuits | Channels | 2 (custom capacity per transformer size) |
| Compensation Method | Three-phase compensation | |
| Control Quantity | Reactive power or current | |
| Fastest Response Time | ms | ≤ 20 |
| Protection Level (Indoor) | IP30 | |
| Protection Level (Outdoor) | IP65 |
Custom-Built Prefabricated Substations for Your Project Needs
We Support Cabinet Customization Including:
Transformer capacity and vector group
Tap changer type (if applicable)
Exterior paint, labeling, and wiring format
Capacitor group configuration
Cabinet structure and installation environment
Export packaging and documentation
We support transformer customization including
Factory Tested. Globally Delivered.
In-house vacuum drying, impulse testing, and heat run facilities
100% testing before shipment
CE / ISO9001 / ISO14001 certified
Export packaging + 3rd party inspection supported
Frequently Asked Questions
We understand that as a professional buyer, you may have technical, logistical, or customization concerns. Below are answers to some of the most frequently asked questions to help you make informed decisions.
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Q Can the JP cabinet be used in coastal or high-humidity areas?A
Yes. With an IP65-rated outdoor enclosure and optional anti-condensation devices, it performs reliably in humid or marine environments.
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Q Can I customize the number of capacitor groups?A
Absolutely. We offer flexible configuration from 2 to 5 levels or based on your specific compensation needs.
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Q What certifications do your JP cabinets comply with?A
Our cabinets are manufactured in compliance with IEC standards and GB/T standard requirements, and third-party certification can be provided upon request.
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Q How fast is the response time for reactive power compensation?A
The system responds in ≤20 ms, ensuring stable voltage and improved power factor efficiency.
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Q What support do you offer for international orders?A
We offer international shipping, multilingual manuals, full export packaging, and remote technical support.
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Whether you're upgrading an existing line or starting a new project, STON will customize a CNC solution for your production.