SVR-3 Type Three Phase Automatic Step Voltage Regulator
The SVR-3 Type Three Phase Automatic Step Voltage Regulator is a state-of-the-art on-load tap changing device engineered to provide precise, automatic voltage stabilization for medium-voltage distribution networks. Featuring premium copper windings, high-permeability silicon steel cores, and a fast-response motorized tap changer, the SVR-3 delivers accurate voltage correction with minimal disturbance. Its intelligent digital controller continuously monitors three-phase voltage and automatically adjusts taps to maintain stable output even under rapid load changes. Designed for harsh outdoor conditions, it offers excellent overload capability, low power loss, and comprehensive protection including over/under voltage, overload, short-circuit, and phase imbalance. With remote SCADA/GSM monitoring capability and robust sealed-tank construction, the SVR-3 significantly improves voltage profile, reduces line losses, and enhances overall power quality in distribution systems.
- Primary Voltage Ratings 11 kV / 22 kV / 33 kV
- Secondary Voltage Ratings --
- H.V. Tap Range --
- Type Voltage Regulator
- BIL 11kV - 200kV
- Standards IEC 60076, IEC 60137, ASTM D202
- Application residential, industrial park, industrial voltage stabilization
- Power Rating --
- Certificate UL, CESI, IEEE
- Cooling Method Natural Air Cooling
- Opeartion --
Technical Specifications
Customization Optional
Packing and Shipping
Manufacturer Test
Routine Testing
Application
Technical Specifications
SVR-3 Type Three Phase Automatic Step Voltage Regulator
SVR-3 Type Three Phase Automatic Step Voltage Regulator Parameter
| Parameter | Specification |
| Rated Capacity | 200 kVA – 3000 kVA |
| Rated Voltage | 11 kV / 22 kV / 33 kV |
| Regulation Range | ±15% ~ ±25% (32 steps) |
| Step Voltage | 0.625% ~ 1% per step |
| Response Time | ≤ 1.2 seconds |
| Cooling Method | ONAN / ONAF |
| Short Circuit Withstand | 25 kA / 3 seconds |
| Ambient Temperature | -40°C to +60°C |
Customization Optional
SVR-3 Type Three Phase Automatic Step Voltage Regulator
The SVR-3 Type Three Phase Automatic Step Voltage Regulator offers extensive customization to perfectly suit various distribution network requirements. Customers can select rated voltage (6kV–36kV), capacity (200kVA–3000kVA), regulation range (±10% to ±30%), and number of tap steps (16–40). The control system supports multiple protocols such as IEC 61850, DNP3, Modbus TCP/RTU, and 4G/GSM remote monitoring for full SCADA integration. We provide enhanced cooling systems (ONAF), stainless steel tanks for coastal areas, and heavy overload designs capable of 200% loading for extended periods.
Special options include harmonic suppression filters, automatic power factor correction integration, low-noise configurations for urban installations, solar-powered backup controllers, and programmable voltage profiles with time-of-day scheduling. Enclosure choices range from compact pole-mounted to pad-mounted or substation frame types with advanced anti-corrosion treatment and animal protection. These flexible customization capabilities allow utilities and contractors to deploy the most effective voltage regulation solution for improving end-user voltage quality and reducing system losses.
Packing and Shipping
SVR-3 Type Three Phase Automatic Step Voltage Regulator
The SVR-3 Type Three Phase Automatic Step Voltage Regulator is packaged with heavy-duty protection suitable for its size and sensitivity. The unit is firmly secured on a reinforced steel skid with anti-vibration mounts and multiple high-strength strapping bands. All bushings, radiators, and the control cabinet are protected with custom wooden frames and high-density foam. The entire regulator is wrapped in multi-layer waterproof and anti-static film with sufficient desiccants. A robust, ISPM 15-compliant wooden crate or steel-reinforced open frame provides complete enclosure, equipped with shock indicators and tilt sensors for full transit monitoring.
We offer reliable shipping solutions tailored to project needs. Sea freight in 20ft or 40ft flat-rack/open-top containers with professional lashing ensures safe international transport, typically taking 25–60 days. Air freight is available for urgent components. Domestic shipments use specialized low-bed trailers with hydraulic cranes and GPS tracking for oversized loads.
Full sets of export documents are prepared in advance, including commercial invoices, packing lists, certificates of origin, test reports, and installation manuals to facilitate smooth customs procedures. We emphasize sustainable logistics by using recyclable materials and optimizing load planning. Customers receive a secure tracking portal with real-time GPS updates and dedicated coordinator support.
Upon delivery, we provide optional professional unloading supervision, oil level checks, and initial inspection guidance. For large projects, we support consolidated multi-unit shipments and scheduled phased deliveries to reduce site storage needs and logistics expenses. This thorough packing and shipping process ensures every SVR-3 regulator arrives safely and ready for immediate installation.
We offer reliable shipping solutions tailored to project needs. Sea freight in 20ft or 40ft flat-rack/open-top containers with professional lashing ensures safe international transport, typically taking 25–60 days. Air freight is available for urgent components. Domestic shipments use specialized low-bed trailers with hydraulic cranes and GPS tracking for oversized loads.
Full sets of export documents are prepared in advance, including commercial invoices, packing lists, certificates of origin, test reports, and installation manuals to facilitate smooth customs procedures. We emphasize sustainable logistics by using recyclable materials and optimizing load planning. Customers receive a secure tracking portal with real-time GPS updates and dedicated coordinator support.
Upon delivery, we provide optional professional unloading supervision, oil level checks, and initial inspection guidance. For large projects, we support consolidated multi-unit shipments and scheduled phased deliveries to reduce site storage needs and logistics expenses. This thorough packing and shipping process ensures every SVR-3 regulator arrives safely and ready for immediate installation.
32
32 years of industry experience
Manufacturer Test
SVR-3 Type Three Phase Automatic Step Voltage Regulator
Progress Test
Early manufacturing progress testing for the SVR-3 regulator includes core material validation through Epstein frame and watt-loss testing to confirm superior magnetic properties. Copper winding resistance, insulation resistance, and inter-turn withstand tests are performed before core-coil assembly. The motorized on-load tap changer undergoes extensive mechanical endurance testing (over 20,000 operations) to verify switching reliability. Tank welding quality is inspected using helium leak detection and radiographic methods. Initial controller board calibration checks voltage sensing precision, protection logic, and communication interfaces. These early inspections, supported by full digital traceability, establish strong mechanical and electrical foundations. Oil processing, degassing, and vacuum filling are strictly controlled for optimal dielectric performance. The automatic regulation algorithm is simulated under wide input voltage and load variations to verify accuracy and response time.
Design Tests
All transformer will be test after finished the production, test items as below:
♦ Insulation Power Factor
♦ Ratio, Polarity, and Phase Relation
♦ Winding Resistance
♦ Impulse Tests
♦ On load Loss Test
♦ No Load Loss Test
♦ Transformer Turns Ratio/TTR (All Tap Voltages)
♦ Impedance Voltage & Load Loss (Rated Voltage)
♦ Polarity, 1-Ph / Phase Relation, 3-Ph (Rated Voltage)
♦ Excitation & No-Load Loss (Rated Voltage)
♦ Applied Voltage
♦ Induced Voltage
♦ Lightning Impulse
♦ Insulation Resistance (Rated Voltage)
♦ Temperature Rise
♦ Dielectric Withstand (Hipot)
Factory Acceptance Test
Factory Acceptance Testing for the SVR-3 Type Three Phase Automatic Step Voltage Regulator begins with accurate ratio, polarity, and impedance verification across all tap positions. No-load loss and excitation current measurements confirm core efficiency. Full-range automatic regulation tests verify output voltage stability and step precision under different load conditions. All protection functions (over/under voltage, overload, short-circuit, phase imbalance) are activated and validated. Control system calibration, display accuracy, alarm functions, and remote communication protocols are thoroughly tested. These core tests are documented with detailed waveforms and data sheets. Advanced FAT includes extended heat-run testing at 100% and 150% rated load to verify temperature rise and cooling effectiveness. On-load tap changer endurance cycling under load confirms long-term mechanical and electrical reliability.
Routine Test - Applied Voltage
Purpose of Testing
The purpose of testing the applied voltage is to verify the insulation strength of the transformer by applying a voltage higher than its normal operating level, ensuring it can withstand potential electrical stresses. This test helps identify any weaknesses or defects in the insulation system before the transformer is put into service.
Testing Equipment
Test equipment: High voltage tester (e.g. TTR, Hipot, etc.)
Voltage source: usually 1 kV, 5 kV, 10 kV, or customized according to customer needs
Temperature and humidity meter: used to record environmental conditions
Voltage source: usually 1 kV, 5 kV, 10 kV, or customized according to customer needs
Temperature and humidity meter: used to record environmental conditions
Pre-Test Preparation
Disconnect the device from the power supply and make sure it is properly grounded and discharged.
Check the connection terminals and wiring to ensure that they are not loose or contaminated.
Test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C).
Check the connection terminals and wiring to ensure that they are not loose or contaminated.
Test under suitable environmental conditions: relative humidity below 75% and no rain (recommended temperature: 20-30°C).
Test Progress
Connect the Test Instrument:
Properly connect the test equipment to the bushings or terminals of the device under test and ensure that all connection points are properly grounded.
Selecting the test voltage:
Select the appropriate applied voltage based on the rated voltage of the equipment.
Properly connect the test equipment to the bushings or terminals of the device under test and ensure that all connection points are properly grounded.
Selecting the test voltage:
Select the appropriate applied voltage based on the rated voltage of the equipment.
Measure and Record
Start the test and record the following parameters:
Measuring leakage current
Applied voltage
Current stability
Any possible voltage fluctuations
Measuring leakage current
Applied voltage
Current stability
Any possible voltage fluctuations
Temperature Correction
If necessary, the measured data is temperature corrected to ensure that it corresponds to standard temperature conditions (usually 20°C).
Repeat Testing (if necessary)
Multiple tests were conducted on different windings (high voltage, medium voltage, low voltage) and bushings, and comparative analysis was performed.
Evaluation Criteria (Reference)
The test was normal and the equipment performed well (qualified)
The current value exceeded the allowable range and the equipment needs to be inspected or maintained (pending repair)
There was a serious fault or instability and the equipment could not continue to operate (unqualified)
The current value exceeded the allowable range and the equipment needs to be inspected or maintained (pending repair)
There was a serious fault or instability and the equipment could not continue to operate (unqualified)
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Perfect for long rural and suburban overhead distribution feeders suffering from significant voltage drop due to distance and heavy loading, automatically maintaining stable voltage for residential and agricultural users.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
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What is a Transformer?A transformer is an electrical device used to change the voltage of alternating current (AC). It works on the principle of electromagnetic induction, converting high-voltage current into low-voltage current or low-voltage current into high-voltage current. Transformers are widely used in power transmission, distribution systems, and various electronic devices.
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What are the main uses of a transformer?The main use of a transformer is voltage conversion. Transformers are used in power transmission systems to help transfer electricity from power plants to consumers. In addition, transformers are also used in electronic devices such as chargers, televisions, power adapters, etc., to adjust the voltage to meet the requirements of different devices.
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Do you have UL listed?Yes, our transformer has UL listed. We have exported to America many pad mounted transformer,substation transformer and HV.
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