Overhead Line Single Phase Automatic Step Voltage Regulator 6kV -34.5kV

The Rockwill single-phase automatic step voltage regulator is an oil-immersed tap-changing autotransformer designed for overhead medium-voltage distribution lines. Equipped with an advanced digital controller and a motor-driven on-load tap changer (OLTC), it continuously samples voltage and current signals from the grid and automatically adjusts the output voltage in discrete steps to compensate for line voltage drop, load fluctuations, and source-side instability.

The regulator covers a ±10 % boost and buck range across 32 steps (approximately 0.625 % per step), and is rated for system voltages from 2,400 V (60 kV BIL) to 34,500 V (200 kV BIL), compatible with both 50 Hz and 60 Hz networks.

Key Features

• Precise step voltage regulation ：32-step on-load tap changer provides fine adjustment within a ±10 % range, maintaining stable output voltage under dynamic load conditions

• Real-time adaptive control： Microprocessor-based controller samples line voltage and current via internal potential and current transformers, automatically selecting the appropriate tap position

• Oil-immersed construction：Mineral oil insulation and sealed tank design ensure reliable outdoor operation with minimal maintenance

• Motor-driven on-load tap changer ：Arc-suppression tap-changer mechanism allows tap transitions under load without service interruption, with a mechanical life exceeding one million operations

• Integrated protection；Built-in lockout functions for line fault, overload, overcurrent, and undervoltage conditions

• Remote monitoring capability ： Optional GPRS / GSM / Bluetooth connectivity for remote control and SCADA integration

• Flexible installation： Suitable for pole-mount, pad-mount, and substation deployment

Technical Parameters

Operating Conditions

 Applications

• Utility distribution networks requiring voltage stabilization on long overhead feeders

• Industrial facilities with fluctuating load demands

• Rural and suburban power lines experiencing voltage drop over distance

• Renewable energy systems requiring consistent voltage under variable generation conditions

Additional voltage ratings and customized configurations are available on request. Contact Rockwill for application-specific sizing and technical support.