Single Phase Automatic Step Voltage Regulator AVR 13.8KV

The HENTG POWER 13.8 kV single-phase automatic line voltage regulator is designed to maintain stable distribution voltage under changing load and power-flow conditions. It is suitable for utility feeders, renewable energy networks, industrial power systems, rural distribution lines, and other applications requiring precise voltage control.

Using an on-load tap-changing autotransformer design, the regulator automatically raises or lowers the output voltage without interrupting the power supply. Typical configurations provide a ±10% regulation range in 32 steps, with approximately 0.625% voltage adjustment per step.

HENTG POWER provides project-specific equipment selection, control configuration, installation design, testing, and technical documentation for utility companies, EPC contractors, renewable energy developers, and industrial customers.

The regulator continuously monitors the distribution voltage and automatically adjusts the tap position when the measured voltage exceeds the preset control bandwidth. Voltage correction is completed without disconnecting the feeder.

A typical ±10% regulation range with 32 steps provides approximately 0.625% adjustment per step, supporting accurate voltage control while minimizing unnecessary tap-changing operations.

The digital control system can be configured according to actual network operating conditions. Adjustable parameters may include:

• Target voltage
• Voltage bandwidth
• Time delay
• Line-drop compensation
• Forward and reverse power-flow modes
• Tap operating limits
• Alarm and monitoring settings

For feeders connected to solar, wind, BESS, or other distributed energy resources, the controller can be configured to accommodate bidirectional power flow, voltage rise, and changing daytime and nighttime operating conditions.

Internal potential winding taps and, where required, an external ratio-correction transformer allow the regulator to be adapted to different system voltages within the approved design range.

Depending on the project specification, optional functions may include:

• Tap-position indication
• Tap-operation counter
• Voltage and load monitoring
• Equipment status recording
• Alarm reporting
• Data logging
• Remote status indication
• SCADA or distribution automation integration

Communication protocols and interfaces are confirmed according to the customer’s control-system requirements.

Engineering condition:
Long distribution feeders, fluctuating loads, and conductor impedance may cause undervoltage or unstable voltage at remote network locations. This can affect motors, pumping stations, industrial equipment, and residential loads.

HENTG POWER solution:
The automatic line voltage regulator raises or lowers the feeder voltage through precise on-load tap adjustment. The controller can also use line-drop compensation to improve voltage regulation at the remote end of the feeder.

Engineering condition:
Solar, wind, BESS, and distributed generation systems may introduce reverse power flow, voltage rise, and substantial voltage variation under different generation and load conditions.

HENTG POWER solution:
HENTG POWER configures the control logic, operating parameters, and installation position according to feeder load profiles and power-flow direction. Forward and reverse operating modes support effective voltage regulation in renewable energy distribution networks.

Engineering condition:
Incorrect regulator ratings or unsuitable control settings may result in insufficient voltage correction, excessive tap-changing operations, increased equipment wear, or unnecessary project costs.

HENTG POWER solution:
Before equipment design, HENTG POWER evaluates system voltage, maximum load current, feeder voltage drop, short-circuit level, insulation requirements, power-flow conditions, installation environment, and future expansion requirements. This supports the correct selection of rated current, regulator capacity, BIL, regulation range, and controller settings.

The HENTG POWER automatic line voltage regulator can be applied in:

• Utility distribution feeders
• Rural and remote power networks
• Solar and wind power distribution systems
• BESS and distributed energy projects
• Industrial plants and mining facilities
• Pumping and irrigation stations
• Distribution substations
• Networks with long feeder distances
• Systems with frequent load variation
• Grid modernization and voltage-quality improvement projects

Suitable for overhead distribution feeders where compact installation, straightforward line integration, and limited ground occupation are required.

Designed for ground-level installation in urban, industrial, renewable energy, or underground distribution systems. Enclosure protection and cable interfaces can be coordinated with the project layout.

Suitable for utility substations, industrial power systems, and projects requiring integration with switchgear, protection, control, and SCADA systems.

For an accurate technical proposal, please provide:

1. Nominal system voltage and maximum operating voltage
2. Frequency and phase arrangement
3. Maximum continuous load current
4. Required voltage regulation range
5. Feeder length and conductor specifications
6. Sending-end and receiving-end voltage profiles
7. Load power factor and daily load curve
8. Available short-circuit level
9. Required insulation level and BIL
10. Forward or bidirectional power-flow conditions
11. Installation method and available space
12. Ambient temperature, altitude, humidity, and pollution level
13. Required communication protocol and SCADA interface
14. Applicable utility standard or project specification

HENTG POWER provides more than automatic voltage regulator equipment. Our engineering support covers operating-condition analysis, equipment selection, customized design, controller configuration, manufacturing, testing, technical documentation, and project coordination.

For EPC and utility projects, HENTG POWER focuses on:

• Project-specific electrical and mechanical design
• Coordination with feeder and substation operating conditions
• Configurable digital voltage-control systems
• Renewable energy and bidirectional power-flow applications
• Site-specific insulation and environmental design
• Factory testing and technical documentation
• Long-term operational reliability and maintainability

Contact HENTG POWER with your feeder parameters, load profile, voltage-regulation requirements, installation conditions, and communication specifications. Our engineering team will evaluate the application and recommend an appropriate voltage regulator rating, control strategy, and installation configuration.

HENTG POWER — Power Transformation · Smarter Distribution

Our HENTG POWER is a leading transformer manufacturer in China with over 15 years of industry experience, specializing in reliable MV and HV transformer solutions for global power systems since 2011.

With a 100,000 m² manufacturing facility, over 250 skilled workers, 30+ senior engineers, and 10+ professional testing engineers, HENTG POWER is dedicated to delivering high-quality transformer solutions to over 300 customers across 45+ countries, supporting large-scale EPC and utility projects worldwide.

We provide a comprehensive product portfolio, including medium and high voltage transformers, dry-type transformers, oil-immersed transformers, substations, switchgear, and distribution boxes. All products are designed and manufactured in compliance with GB 20052-2024, IEC 60076, and IEEE standards, meeting the technical requirements of power utilities, EPC contractors, and energy solution providers.

HENTG POWER transformers are widely applied across urban and rural distribution networks, industrial and heavy manufacturing facilities, power substations, renewable energy systems, battery energy storage systems (BESS), and data centers, delivering stable and efficient power for critical infrastructure projects.

Guided by our mission — “Transform Energy, Connect the Future.” — HENTG POWER implements strict 5S factory management throughout the entire manufacturing process. Every transformer undergoes 100% Outgoing Quality Control (OQC) with eight comprehensive testing procedures, ensuring long-term reliability, safety, and performance under demanding operating conditions.

Trusted by clients in 45+ countries, HENTG POWER is committed to providing responsive technical support and engineered transformer solutions.

Feel free to contact us today for professional engineering assistance and a free quotation. Thank you.