step down transformer
1.Automatic voltage regulation: real-time voltage adjustment, ensuring qualified and stable voltage.
2.Wide voltage regulation range: solves the problems of low voltage and large fluctuations at the end of the line.
3.Safe and reliable: complete protection, automatic fault isolation.
4.Suitable for outdoor use: can be installed on poles or on the ground, unattended.
5.Energy saving and efficiency improvement: improves power supply quality and reduces line losses.
Product Details of 10kV Automatic Line Voltage Regulator
I. Product Introduction
10kV Automatic Line Voltage Regulator is an outdoor intelligent voltage regulating complete equipment specially developed to solve core problems of 10kV distribution network, such as long-distance power supply, large load fluctuation, low terminal voltage and unqualified voltage quality. As key equipment for distribution network upgrading, it is widely used in rural networks, mountainous areas, industrial parks, urban-rural fringe areas, remote regions and other unstable voltage scenarios, playing an important role in ensuring power supply reliability, improving user experience and reducing grid loss.
The device adopts an integrated design, mainly consisting of regulating transformer body, vacuum on-load tap changer, intelligent measurement and control controller, electric drive mechanism, comprehensive protection system, outdoor sealed cabinet and auxiliary wiring components. It can be installed and commissioned right out of the box without additional auxiliary equipment, featuring short construction period and strong adaptability.
Its working principle is: the intelligent controller collects key parameters in real time, including input voltage, output voltage, load current and power factor. Through the built-in intelligent algorithm, it automatically sends voltage regulation commands to drive the on-load tap changer. Voltage boost and buck regulation are accurately completed without power interruption, ensuring the line voltage is always stabilized within the national qualified range (10kV±10%). It thoroughly solves problems such as undervoltage at peak hours, overvoltage at low hours and frequent voltage fluctuation.
The equipment is specially optimized for harsh outdoor environments with fully sealed and high-protection structure. It supports pole-mounted and outdoor floor-mounted installation without a special distribution room, greatly saving space and construction cost. It features fully automatic operation, unmanned duty, convenient maintenance and long service life.
It fully complies with GB/T 1094.1-2013, GB/T 1094.2-2013 and relevant power industry standards. It can be directly connected to the existing 10kV distribution lines without large-scale reconstruction, with strong compatibility. Compared with traditional voltage regulating equipment, it has obvious advantages in regulation accuracy, response speed, protection performance and operation & maintenance cost, providing the most economical, direct and efficient solution for voltage stability in distribution network reconstruction.
II. Specifications（customizable）
| Item | Specification | Description |
Rated Voltage | 10kV (±10%) | Suitable for standard 10kV distribution lines |
Rated Frequency | 50Hz (±2%) | In line with national power frequency standard |
Rated Capacity | 50kVA–1000kVA (single unit); parallel expansion available | Wide capacity range, customizable according to load and line length |
Voltage Regulation Mode | Vacuum on-load automatic regulation, uninterrupted power supply | No power cut, no flash, no impact during regulation |
Regulation Range | ±5%, ±8%, ±10%, ±15% (customizable) | Wide range to compensate voltage drop of long-distance lines |
Regulation Steps | 5, 7, 9 steps, continuously adjustable | High regulation precision |
Regulation Accuracy | ≤±2% | High precision, meets national power quality standard |
Response Speed | ≤100ms (action response); ≤500ms (voltage stabilization) | Fast response to sudden load change |
Control Mode | Automatic (default), manual (backup), remote control (optional) | Automatic operation, manual for maintenance, remote for monitoring |
Protection Functions | Overvoltage, undervoltage, overcurrent, overload, phase loss, loss of voltage, overheating, lightning protection, short circuit, zero-sequence protection, tap changer fault protection | Full protection to ensure equipment and line safety |
Insulation Class | Class H / Class F (optional) | Class H for high temperature; Class F for general environment |
Cabinet Material | Cold-rolled steel (sprayed) / Stainless steel 304/316 | Cold-rolled steel for general use; stainless steel for corrosive environment |
Protection Degree | IP54 or above (IP65 customizable) | Fully sealed, rainproof, dustproof, suitable for outdoor use |
Installation | Outdoor pole-mounted / floor-mounted | Flexible installation, no need for distribution room |
Operating Environment | Temp.: -40℃～+70℃; Humidity: ≤95% non-condensing; Altitude: ≤2000m; Wind resistance ≥ grade 12; Seismic resistance ≥ grade 8 | Adaptable to extreme outdoor environments |
Service Life | Core components ≥15 years; whole set ≥10 years | Long service life, low failure rate |
Operation Mode | 24h continuous automatic operation | Uninterrupted operation for all-weather power supply |
Noise Level | ≤65dB @ 1m | Low noise, suitable for residential, school, hospital |
III. Main Features
1. Intelligent & Precise Regulation, Stable Voltage
Equipped with high-performance intelligent controller and high-precision sampling module to collect voltage, current, power factor and frequency in real time.
Built-in intelligent algorithm automatically identifies load and voltage variation, realizing “no undervoltage at peak, no overvoltage at low”.
Supports user-defined voltage threshold, parameter memory and fault memory functions.
2. On-load Uninterrupted Regulation, No Impact on Users
Adopts vacuum on-load tap changer, no power interruption, no flash, no voltage surge during regulation.
Vacuum arc extinguishing, reliable operation, long mechanical life (≥100,000 operations).
Multi-step fine regulation ensures smooth and stable voltage.
3. Wide Regulation Range for Long Lines & Weak Grids
Regulation range can be set flexibly from ±5% to ±15%.
Effectively pulls substandard terminal voltage back to qualified range, solving the problem of long-distance voltage drop.
Strong adaptability to light load, heavy load and sudden load change.
4. High-protection Outdoor Design for Harsh Environments
Fully sealed cabinet with protection grade up to IP54–IP65, rainproof, dustproof, anti-moisture, anti-salt mist.
Wide working temperature: -40℃～+70℃, windproof, earthquake-resistant, lightningproof.
Optimized heat dissipation and anti-condensation design for long-term stable operation.
5. Complete Protection, High Safety & Reliability
Full electrical and mechanical protections cover all common faults.
Automatic fault identification, alarm, locking and tripping to prevent accident expansion.
Anti-misoperation design and lightning protection improve outdoor operation safety.
6. Fully Automatic & Unmanned, Low O&M Cost
Fully automatic operation without on-site duty.
Simple structure and convenient maintenance; routine inspection can be done by ordinary electricians.
Optional remote monitoring via computer or mobile APP for remote management.
7. Energy Saving & High Economic Benefits
Reduces 10kV line loss by 5%–15% after voltage stabilization.
Improves transformer and line utilization, avoiding unnecessary capacity expansion.
Reduces equipment damage and production loss caused by unstable voltage.
8. Flexible Installation, Short Construction Period, Low Investment
Integrated pre-assembled structure, ready for installation out of box.
Supports pole-mounted and floor-mounted installation, no need for special room.
Low investment, quick effect; investment can be recovered in 1–2 years.
9. Strong Compatibility for Various Distribution Networks
Directly connected to existing 10kV lines without large reconstruction.
Capacity, regulation range and installation can be customized.
Supports parallel operation and gradual expansion with load growth.
IV. Application Scenarios
1. Rural Power Grids & Rural Network Upgrading
Long supply radius, scattered loads, serious terminal undervoltage. Suitable for rural residential electricity and farm irrigation.
2. Mountainous & Hilly Areas with Long-distance Lines
Complex terrain, large voltage drop, difficult operation and maintenance. The regulator adapts to harsh environments and realizes unattended operation.
3. Industrial Parks & Industrial & Mining Enterprises
Dense high-power loads, frequent fluctuation, easy undervoltage at peak hours. Ensures stable operation of production equipment.
4. Urban-rural Fringe & Old Residential Areas
Aging lines, rapid load growth, obvious peak-valley voltage difference. Improves residential power experience.
5. New Energy Supporting 10kV Lines
Photovoltaic and wind power stations with frequent voltage fluctuation. Stabilizes voltage and supports smooth grid connection.
6. Mining, Breeding, Irrigation Special Lines
Harsh environment, large load change, high voltage stability demand. Ensures normal operation of pumps, fans and mining equipment.
7. Remote & Border Areas
Long lines, scattered loads, difficult maintenance. High-protection, long-life and unattended design.
8. Other Unstable Voltage Scenarios
Rail transit, ports, sewage treatment plants, schools, hospitals and other places requiring high power quality.
