32 step fully automated maintenance-free voltage regulator 6kV-33kV

The Rockwill RVR-1 is a fully automated, maintenance-free single-phase step voltage regulator designed for reliable voltage regulation in 11 kV to 33 kV distribution networks. Built as an oil-immersed autotransformer with an integrated on-load tap changer (OLTC), it delivers ±10% regulation across 32 steps (approximately 0.625% per step) to maintain stable output voltage under varying load and source conditions.

A microprocessor-based controller continuously monitors load-side voltage and current through internal potential and current transformers, automatically adjusting tap positions to keep line voltage within the programmed target range. This closed-loop control compensates for voltage drops on long feeders, load fluctuations, and source-side instability common in weak or extended distribution systems.

The regulator features an IP-rated hermetically sealed tank that eliminates moisture ingress and oil oxidation, supporting long-term maintenance-free operation in outdoor environments. The sealed design withstands severe weather, corrosion, and temperature extremes without requiring periodic inspection or oil replacement.

Available in multiple voltage ratings between 11 kV and 33 kV, the RVR-1 supports pole-mounted, pad-mounted, or substation installation, making it adaptable to diverse distribution network architectures.

Key Features

• Fully automated operation：Microprocessor-based controller provides real-time tap adjustment without manual intervention, maintaining stable output voltage across all load conditions

• Maintenance-free sealed design：IP-rated hermetically sealed tank prevents moisture ingress and oil oxidation, eliminating periodic maintenance and reducing lifecycle cost

• Precision step regulation：Fine-resolution tap changer delivers tight voltage correction for sensitive loads and long distribution feeders

• On-load tap changing：Motor-driven OLTC enables tap transitions under load without service interruption

• Oil-immersed construction：Proven insulation and thermal performance for reliable outdoor, all-weather operation

• Flexible deployment：Pole, pad, or substation mounting with standard brackets or base plates

• Digital connectivity：Programmable controller with remote communication capability for SCADA integration

• Standardized compliance ：Designed to IEC 60076-21 and IEEE C57.15 for international market acceptance

Specifications 

50Hz

 Main Application Scenarios

• Urban and rural distribution lines：The step voltage regulator stabilizes voltage and solves low voltage and drift issues in long-distance power supply.

• New energy grid connection：The voltage regulator balances voltage fluctuations for photovoltaic and wind power stations.

• Industrial & mining power supply：The step voltage regulator guarantees stable power for heavy-load equipment against voltage surges and drops.

• Rural grid renovation：The voltage regulator adapts to decentralized loads and improves overall power supply quality.

• Substation supporting：The step voltage regulator optimizes system voltage as terminal regulation equipment.

• Remote mountainous & island power supply：The voltage regulator suits harsh environments for unattended steady voltage regulation.