Dry-Type Voltage
Regulators
for Safe Power Control
Wenfei's dry-type voltage regulators deliver eco-friendly, fire-resistant power stabilization without oil or maintenance hassles--trusted in hospitals, data centers, and green buildings across 40+ countries.
Why Choose Dry-Type?
Superior safety and environmental benefits over oil-filled alternatives
Fire Safety
Class F1 fire-resistant insulation--no flammable oil, ideal for occupied buildings and hospitals
Eco-Friendly
Zero oil leakage risk, recyclable materials, compliant with green building standards (LEED, BREEAM)
Low Maintenance
No oil testing, no leak repairs--simple visual inspections reduce lifecycle costs by 40%
Indoor Safe
IP20-IP54 enclosures, low noise (<50dB), no toxic fumes--install directly in occupied spaces
Our Dry-Type Product Line
Comprehensive range from compact residential units to high-capacity industrial systems
SBW-S-100KVA Three-Phase Automatic Compensation Voltage Stabilizer | 380V Industrial Power Regulator
SBW-500KVA Three Phase Automatic Voltage Stabilizer | Industrial Compensation Type Power Regulator 380V
50kVA Heavy-Duty Automatic Voltage Stabilizer | Solves Voltage Fluctuations for CNC & Industrial Production Lines
TNS-Z-30KVA Three-Phase High-Precision Automatic AC Voltage Stabilizer (30KVA Industrial Grade)
TNS-N-90KVA
TNS-N-50KVA
TND-Z-15KVA
TND-3kVA
TND(SVC)-5000VA
TND(SVC)-3000VA
SVC(TND)-2000VA
TND(SVC)-1000VA
SBW-N-500KVA
SBW-N-400KVA
TND-Z-30 KVA
TNS-Z-30 KVA
SBW-N-200KVA
SBW-N-100KVA
SBW-N-50KVA
SBW-N-600KVA
SBW-N-300KVA
Technical Specifications
Key features of Wenfei dry-type voltage regulators
Regulation Accuracy
±1% to ±3% output voltage stability with automatic tap-changing or contactless regulation technology
Insulation Class
Class F (155°C) or Class H (180°C) insulation materials with UL94 V-0 flame retardant rating
Overload Capacity
1.5x rated current for 60 seconds, automatic bypass or shutdown protection on sustained overload
Noise Level
<50dB at 1 meter distance with forced-air or natural cooling, suitable for office/hospital environments
Ideal Applications
Where dry-type voltage regulators excel
Commercial Buildings
Office towers, shopping malls, hotels--indoor installation without fire suppression systems
Healthcare Facilities
Hospitals, clinics, imaging centers--critical equipment protection with zero toxic fume risk
Data Centers
Server rooms, telecom hubs--compact footprint, low heat dissipation, 24/7 reliability
Dry-type Voltage Regulator FAQ
Expert answers to dry-type voltage stabilization questions
What are the key advantages of dry-type voltage regulators over oil-immersed models?
Primary Benefits:
- Fire Safety: No flammable oil--ideal for indoor installations, hospitals, data centers, and high-rise buildings
- Environmental Compliance: Zero oil leak risk, meets stringent green building standards
- Low Maintenance: No oil testing, filtration, or replacement required
- Compact Design: Smaller footprint with vertical mounting options
- Quick Installation: No oil filling process--ready to operate immediately after delivery
🌿 Best For: Indoor applications, urban areas, facilities requiring Class F1/H insulation ratings, and projects with strict environmental regulations.
How do I determine the correct insulation class for my dry-type regulator?
Class F (155°C)
- ✓ Standard industrial environments
- ✓ Ambient temp ≤40°C
- ✓ Normal ventilation conditions
- ✓ Cost-effective solution
- ✓ 20-year typical lifespan
Class H (180°C)
- ✓ High-temperature environments
- ✓ Ambient temp up to 50°C
- ✓ Overload-prone applications
- ✓ Extended service life (25+ years)
- ✓ Premium reliability
Selection Guide: Class F for standard HVAC/lighting; Class H for foundries, tropical climates, or mission-critical loads requiring maximum thermal margin.
What cooling methods are available for dry-type voltage regulators?
Cooling Classification (IEC 60076-11):
- AN (Air Natural): Self-cooled by natural convection--silent operation, up to 500 kVA, requires adequate room ventilation
- AF (Air Forced): Fan-assisted cooling--supports 500-2500 kVA, automatic fan engagement at 60% load, IP23-IP54 enclosures available
- Hybrid AN/AF: Fans activate only under heavy load--combines silence and high capacity
Ventilation Requirements:
- AN models: Minimum 1.5m clearance on all sides, ambient ≤35°C
- AF models: 0.8m clearance sufficient, can operate up to 40°C ambient
- Enclosed rooms: Provide 0.1 m³/s air exchange per 100 kVA capacity
🌡️ Temperature Monitoring: Wenfei units include PT100 sensors with digital displays and configurable over-temperature alarms (typically set at 130°C for Class F).
How do I calculate the required kVA rating for a dry-type voltage regulator?
Step-by-step Sizing Process:
- Calculate Total Load: Sum all connected equipment kW ratings (check nameplates)
- Apply Diversity Factor: For mixed loads, multiply by 0.7-0.9 (not all equipment runs simultaneously)
- Convert to kVA: kVA = kW ÷ Power Factor (use 0.8 if unknown)
- Add Derating: Dry-type units derate 2.5% per °C above 30°C ambient--multiply by 1.1-1.15 for hot environments
- Future Expansion: Add 20-30% margin for load growth
- Example: 80kW load ÷ 0.8 PF = 100 kVA × 1.15 (high temp) × 1.25 (expansion) = 144 kVA → Select 160 kVA unit
💡 Special Cases: For motor-heavy loads (pumps, compressors), use locked rotor current (LRA) for sizing--typically 6-8× running current. Contact Wenfei for free load analysis and thermal calculations.
What maintenance is required for dry-type voltage regulators?
Quarterly Inspection (Every 3 Months):
- Visual check for dust accumulation on windings and coils
- Verify cooling fan operation (AF models)--clean blades if needed
- Inspect terminal connections for discoloration or looseness
- Record temperature readings and compare to baseline
Annual Maintenance:
- Deep Cleaning: Use compressed air (≤0.3 MPa) or vacuum to remove dust from core and windings
- Insulation Test: Megger test at 1000V DC--resistance should exceed 100 MΩ
- Tap Changer Service: Lubricate mechanical contacts, verify position indicators
- Thermal Imaging: Scan for hot spots indicating connection issues
5-Year Major Service:
- Full electrical testing (winding resistance, turns ratio, voltage regulation accuracy)
- Replace cooling fans and filters
- Re-torque all bolted connections to manufacturer specs
🔧 No Consumables: Unlike oil-immersed units, dry-type regulators require no oil changes, DGA testing, or moisture removal--drastically reducing lifetime maintenance costs. Wenfei offers preventive maintenance contracts with remote monitoring options.
Dry-type Voltage Regulator
Advanced Features & Benefits
Wenfei Electrical Equipment
Superior Dry-type Voltage Regulation Technology
Dry-type voltage regulators represent the pinnacle of safe, efficient, and environmentally friendly power conditioning technology. Unlike oil-immersed counterparts, our dry-type units eliminate fire hazards, require minimal maintenance, and operate reliably in diverse environments--from precision manufacturing facilities to medical institutions and data centers where power quality directly impacts operational success.
1 Advanced Insulation & Safety Design
Our dry-type voltage regulators utilize H-class insulation materials (180°C thermal rating) with epoxy resin encapsulation technology, ensuring superior protection against moisture, dust, and environmental contaminants. The non-flammable design meets UL and IEC safety standards, making them ideal for indoor installations in hospitals, laboratories, and commercial buildings where oil-filled transformers are prohibited. Built-in overload protection and thermal monitoring systems prevent equipment damage and extend operational lifespan beyond 25 years.
2 Wide Input Range & Precision Output
Engineered to handle extreme voltage fluctuations from 160V to 480V input, our dry-type regulators deliver stable output voltage with ±1% accuracy under all load conditions. The advanced tap-changing mechanism responds within 1.5 seconds to voltage variations, protecting sensitive equipment like CNC machines, medical imaging systems, and server infrastructure. Three-phase balanced regulation ensures equal voltage distribution across all phases, eliminating neutral point displacement and reducing motor vibration by 40%.
3 High Efficiency & Energy Savings
Wenfei's dry-type voltage regulators achieve 98.5% efficiency through optimized silicon steel core design and precision-wound copper windings. Low no-load losses (typically under 1%) and minimal harmonic distortion (THD < 3%) reduce energy waste and prevent interference with adjacent equipment. For a 100kVA installation operating 24/7, our regulators save approximately $2,800 annually in electricity costs compared to conventional designs, delivering ROI within 18 months while reducing carbon emissions by 12 tons per year.
4 Compact Design & Easy Installation
The dry-type construction eliminates the need for oil containment systems, fire suppression equipment, and extensive ventilation, reducing installation footprint by 30-40% compared to oil-immersed units. Modular design with IP20-IP54 protection ratings allows flexible placement in equipment rooms, basements, or rooftop installations. Pre-wired terminal blocks and clear labeling enable rapid commissioning--typical installations complete in 4-6 hours with minimal specialized tools or training required.
5 Intelligent Monitoring & Maintenance-Free Operation
Equipped with digital control panels and optional IoT connectivity, our dry-type regulators provide real-time monitoring of input/output voltage, current, power factor, and temperature. Smart diagnostics detect abnormal operating conditions and send alerts via SMS or email before failures occur. The sealed, maintenance-free design eliminates routine oil testing, filter changes, and insulation checks--reducing annual maintenance costs by 75% while ensuring 99.9% uptime in mission-critical applications.
Wenfei Dry-type Voltage Regulator Series
Wenfei's dry-type voltage regulator lineup spans 5kVA to 2000kVA capacities, serving applications from small laboratories to large industrial complexes. Our products feature automatic/manual switching modes, bypass circuits for maintenance continuity, and customizable input/output voltage configurations. With ISO 9001 and CE certifications, over 8,000 units deployed across medical facilities, telecom infrastructure, and precision manufacturing plants in 35+ countries, Wenfei delivers proven reliability where power quality cannot be compromised.
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