Overhead Voltage Regulator Voltage Stabilization and Compensation 6kV-33kV

Attributes Description Documentation Resource Library

Key attributes

Brand	ROCKWILL
Series	RVR
Rated Voltage	6kV-33kV
Rated Current	50-600A
Capacity	30-990kVA
Rated Frequency	50/60 Hz

Description

Single-phase overhead step voltage regulator is an oil-immersed tap-changing autotransformer fully compliant with IEC 60076-21 special standard for line voltage regulators.
It stabilizes fluctuating feeder voltage within ±10% boost & buck range via 32 independent tap steps (0.625% adjustment per step), effectively solving voltage drop caused by long-distance lines and variable loads.
Dual 50Hz / 60Hz frequency design covers global distribution grids. Three mounting options are available: pole-mounted, pad-mounted and substation base. Hermetically sealed oil tank together with motor-driven arc-suppression tap-changer ensures stable, low-maintenance outdoor operation.

Product Showcase Video

Standard Construction & Accessories

Standard Equipped

Hermetically sealed anti-corrosion welded steel tank
ONAN natural circulation cooling radiators
High-creepage medium voltage insulating bushings
Digital programmable regulator controller with data logging
Tap position indicator with calibration function
Pressure relief safety device, oil drain valve, oil level gauge
Galvanized pole-mount brackets and lifting lugs

Optional Extra Parts

Ratio correction transformer for multi-system voltage matching
External lightning surge arrester
Built-in temperature monitoring module

Core Technical Features

Precise Fine Regulation：32-step continuous adjustment within ±10% full range to maintain constant output voltage.
Wide Grid Adaptability：Covers nominal system voltage from 6.35kV to 34.5kV, matched with 60~200kV BIL insulation grades.
Intelligent Digital Control：Customizable voltage threshold and multiple communication protocols for remote monitoring.
Flexible Installation Hardware：Complete mounting kits for overhead poles, ground pads and distribution substations.
Universal Tap Winding Design：Built-in multi-tap windings cooperate with optional ratio transformer to fit various regional grid standards.

Technical Specifications

Voltage (kV)	Current (A)	Capacity (kVA)	BIL (kV)	Power Frequency Withstand Voltage (kV)	Insulation Class
6 / 6.35	50	30/32	75/95	28	A
	100	60/64
	150	90/95
	200	120/127
	300	180/191
	400	240/254
	500	300/318
	600	360/381
11	50	55
	100	110
	150	165
	200	220
	300	330
	400	440
	500	550
	600	660
15	50	75	125/150	50
	100	150
	150	225
	200	300
	300	450
	400	600
	500	750
22	50	110
	100	220
	150	330
	200	440
	300	660
33	50	165	170/200	70
	100	330
	150	495
	200	660
	250	825
	300	990

Product Competitive Advantages

High Long-Term Reliability：Arc-free tap switching eliminates internal sparking; fully sealed tank prevents oil aging and leakage, adapting to humid, coastal and tropical outdoor environments.
Full Customization Support：Adjustable rated current, voltage ratio and control logic to satisfy customized project specifications.
Low Operation & Maintenance Cost：Automatic tap change minimizes manual inspection frequency; 20-year standard design service life.

Application Scenarios

Urban & Rural Overhead Distribution Feeders：Compensate voltage drop on long overhead lines to stabilize residential power supply.
Industrial Parks & Manufacturing Zones：Maintain stable voltage for heavy machinery and precision sensitive equipment.
Distributed New Energy Grids：Suppress voltage fluctuation from photovoltaic and wind power generation.
Outdoor Medium-Voltage Distribution Substations：Improve whole-network voltage control accuracy and power quality.

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

Rockwill
Comprehensive Solution for Substation Step Voltage Regulators: From Working Principles to Future Trends

1. Working Principle and Technological Evolution of Step Voltage RegulatorsThe Step Voltage Regulator (SVR) is a core device for voltage regulation in modern substations, achieving precise voltage stabilization through tap-changing mechanisms. Its core principle relies on transformer ratio adjustment: when voltage deviation is detected, a motor-driven system switches taps to alter the winding turns ratio, adjusting the output voltage. Typical SVRs provide ±10% voltage regulation with step increm

Rockwill
Zanzibar project – voltage regulator selection misalignment with load requirements: root cause analysis & solution

I. Incident BackgroundThe 33kV line voltage regulator (13 taps, 4% step per tap) supplied by our company for the Zanzibar project has been commissioned and is currently in operation. However, during nighttime periods of low load, the regulator has repeatedly caused the low-voltage side voltage at the downstream factory to rise to 420V, triggering overvoltage shutdowns of production machinery. Following these incidents, the customer specified a maximum permissible low-voltage side tolerance of 41

Rockwill
Midnight Voltage Surge to 420V Causes Plant Shutdown? The RVR-1 Automatic Voltage Regulator Breaks the

Introduction: A "Low-Load Hours" Crisis That Struck in the Early MorningBetween 1:00 AM and 7:30 AM on August 24, while most plants were in their low-production overnight window, one facility was forced to shut down three times in succession due to voltage spikes reaching 420V. This was not a grid fault, but a classic case of "off-peak voltage over-limit."During late-night hours when grid load is light, line losses are minimal, and excess reactive power causes the terminal voltage to rise sharpl

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Reference Projects for voltage regulator

Successful Case of 263 Units of 33kV Oil-immersed 32-step Voltage Regulator Controller Project in Bangladesh

Successful Case of 263 Units of 33kV Oil-immersed 32-step Voltage Regulator Controller Project in Bangladesh01 Overall Project Overview1.1 Project BackgroundIn June 2024, 263 units of 33kV oil-immersed 32-step voltage regulator controller were officially delivered and applied to the Bangladesh Medium Voltage Distribution Network Upgrade Project. R&D and manufactured by Rockwill, these devices are used for voltage stability regulation, load fluctuation adaptation and power supply quality impr

Rockwill

Documentation Resource Library voltage regulator

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33 kV On Load Automatic Voltage Regulator

Technical Data

English

PDF

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6kV to 34.5kV Single Phase Automatic Voltage Regulator Brochure

Catalogue

English

PDF

Public.

Rockwill Electric Group Profile

Brochure

English

PDF

Restricted.

RVR-1 Type Single Phase Automatic Voltage Regulator 6kV-34.5kV

Operating Instruction

English

PDF

Restricted.

RVR-1 Single Phase Automatic Voltage Regulator 6kV-34.5kV

Catalogue

English

PDF

Certifications voltage regulator

FAQ for voltage regulator

Does the voltage regulator support 50Hz and 60Hz power grids?

Yes, dual 50Hz/60Hz frequency design fits global distribution grid requirements.

What installation types are supported for the step voltage regulator?

Three flexible installation options: pole-mounted, pad-mounted and substation base installation.

Does the voltage regulator have safety protection devices?

It is equipped with pressure relief device, oil drain valve, oil level gauge and motor-driven arc-suppression tap-changer for safe operation.

What is the warranty period of the overhead voltage regulator?

We provide up to 10 years of warranty service. The warranty covers manufacturing defects under standard installation and normal operating conditions.

$3200.00

Pricing calculator

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Rockwill Electric Group Profile

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Whole life care manager

Whole-life care management services for equipment procurement, use, maintenance, and after-sales, ensuring safe operation of electrical equipment, continuous control, and worry-free electricity consumption.

The equipment supplier has passed platform qualification certification and technical evaluation, ensuring compliance, professionalism, and reliability from the source.