Three-Phase Automatic Step Voltage Regulator-13.8kV to 34.5kV

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Key attributes

Brand	ROCKWILL
Series	RVR-3
Rated voltage	13.8kV to 34.5kV
Rated capacity	38 – 1,000kVA
Rated frequency	50 / 60Hz

Description

The Rockwill three-phase automatic step voltage regulator is an oil-immersed unit designed to stabilize medium-voltage distribution lines. It operates as a self-regulating autotransformer with an advanced digital controller that continuously samples voltage and current signals from the grid. By automatically adjusting the output voltage through a motor-driven on-load tap changer (OLTC), it enhances grid efficiency, maintains power quality, and responds to varying load demands.

The regulator supports both 50 Hz and 60 Hz systems, with standard voltage ratings of 13.8 kV, 14.4 kV, 19.92 kV, and 34.5 kV, and is suitable for pole-mount, pad-mount, and substation installations.

Key Features

Automatic voltage regulation： Continuously monitors grid voltage and current in real time; automatically adjusts taps to maintain stable output within the desired range
Wide regulation range： Provides up to ±20 % voltage regulation through 16 steps with 2.5 % per step, covering boost and buck operation
Oil-immersed construction ： Mineral oil insulation and ONAN cooling ensure reliable operation in demanding outdoor environments
Motor-driven on-load tap changer： Self-developed high-capacity OLTC with limit switches enables precise tap transitions without interrupting load current
Flexible installation： Configurable for pole-mount, pad-mount, or substation layouts to suit utility and industrial distribution networks
Optional remote monitoring： Supports GPRS / GSM / Bluetooth communication for remote control and SCADA integration

Technical Parameters

Parameter	Unit	Value
Rated voltage (nominal system)	kV	13.8 / 14.4 / 19.92 / 34.5
Rated frequency	Hz	50 / 60
Rated capacity (three-phase)	kVA	38 – 1,000
Tap changer type	—	On-load tap changer (OLTC), motor-driven
Regulation range	%	±20 (boost / buck)
Number of regulation steps	—	16
Step voltage	%	2.5
Operating mechanism	—	Motor-driven with limit switches
Cooling method	—	ONAN (Oil Natural Air Natural)
Insulation medium	—	Mineral oil
Winding type	—	Autotransformer
Standard BIL (13.8 / 14.4 kV)	kV peak	125
Standard BIL (19.92 kV)	kV peak	170
Standard BIL (34.5 kV)	kV peak	200
Power frequency withstand (13.8 / 14.4 kV)	kV	38
Power frequency withstand (19.92 kV)	kV	60
Power frequency withstand (34.5 kV)	kV	70
Control / communication	—	Optional GPRS / GSM / Bluetooth
Applicable standards	—	IEC 60076-21, IEC 60214, IEEE C57.15

Applications

Medium-voltage distribution line voltage stabilization for utility networks
Industrial facilities requiring consistent power quality despite load fluctuations
Rural and urban feeder regulation to maintain end-user voltage within statutory limits
Integration into substation, pole-mount, or pad-mount distribution systems

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

Solutions for Voltage Regulator

Step Voltage Regulator Solutions for Southeast Asia: Empowering Grids and Enhancing Voltage Stability

Ⅰ. Southeast Asia Power Sector: Status and Demand Analysis Grid Weakness and Energy Access Challenges Over 35 million people in Southeast Asia still lack electricity access. Remote areas rely on diesel generators (e.g., Padua Village, Indonesia), experiencing unstable supply and high costs. Tropical climate leads to high line losses. Integration of photovoltaic (PV) systems and electric vehicles (EVs) exacerbates three-phase voltage imbalance issues in distribution grids. Demand for New Ener

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FAQ for Voltage Regulator

Q: What is the primary function of the SVR 3 three-phase step voltage regulator？

The SVR 3 is designed to stabilize medium voltage distribution lines by acting as a self regulating autotransformer. It automatically adjusts the output voltage to ensure consistent power quality and grid efficiency regardless of fluctuations in load demand.

Q：How does the SVR smart controller manage voltage regulation？

A:The three-phase step voltage regulator continuously monitors and samples voltage and current signals directly from the grid. Using this real time data it directs the on load tap changer to adjust the voltage steps precisely ensuring that the output remains within the desired range for the distribution network.

Q：What internal components are integrated into the SVR3 system？

A:The three-phase step voltage regulator integrates several critical components including an on load tap changer OLTC current transformers CTs and voltage transformers VTs. It also features limit switches to manage the regulation steps reliably and prevent over travel during the adjustment process.

Q：What makes the three-phase step voltage regulator a reliable choice for power distribution？

A:As a product from Chinas pioneer source factory the SVR 3 benefits from decades of technical expertise and top tier R&D. Its oil immersed design and advanced manufacturing system ensure performance that exceeds industry standards for reliability in various operating environments.

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