Single Phase Automatic Step Voltage Regulator
The Single-phase Automatic Step Voltage Regulator is an advanced, intelligent voltage stabilization device designed to automatically correct voltage fluctuations and deliver stable output for sensitive electrical equipment. Utilizing a high-efficiency toroidal or laminated core with premium copper windings and multiple tap positions, this regulator provides fast, precise step-type voltage correction (±10% to ±30% input range) with response times under 1 second. It features a microprocessor-based digital controller with LCD display, multiple protection functions (over-voltage, under-voltage, overload, short-circuit, and surge), and automatic bypass capability. Built with robust construction and high overload capacity (up to 200% for short durations), it ensures reliable performance in varying load conditions while maintaining low waveform distortion and high efficiency (>98%). Ideal for single-phase 220V/230V/240V systems, this voltage regulator is widely used in residential, commercial, and light industrial applications to protect equipment from unstable grid voltage and extend service life.
- Primary Voltage Ratings 15kV / 33kV class (50Hz)
- Secondary Voltage Ratings --
- H.V. Tap Range --
- Type Voltage Regulator
- BIL 11kV - 200kV
- Standards IEC 60076, IEC 60137, ASTM D202
- Application residential, commercial, 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
Single Phase Automatic Step Voltage Regulator
Single Phase Automatic Step Voltage Regulator Parameter
15kV,33kV Step voltage regulator Specification
Single Phase Automatic Step Voltage Regulator Technical Data
| Parameter | Specification |
| Rated Capacity | 5kVA – 100kVA |
| Input Voltage Range | 150V – 270V / 100V – 280V (customizable) |
| Output Voltage | 220V / 230V ±1% – ±3% |
| Response Time | ≤1 second |
| Efficiency | ≥98% |
| Frequency | 50/60Hz |
| Protection Functions | Over/Under voltage, overload, short circuit, surge, bypass |
| Operating Temperature | -15°C to +45°C |
| Display | LCD + LED indicators |
| Cooling Method | Natural air cooling |
The 15kV and 33kV Step Voltage Regulator (SVR) is a single-phase, oil-immersed, pole-mounted automatic voltage regulator designed for medium voltage distribution lines. Compliant with EEU standards and IEC/IEEE requirements, it provides precise voltage stabilization with ±10% regulation in 32 steps of approximately 0.625% (5/8%) each.
Key Specifications:
- Voltage Rating: 15kV / 33kV class (50Hz)
- Regulation Range: -10% to +10%
- Capacity: 15kV series up to 600A (660kVA+); 33kV series 50-250A (165-825kVA)
- BIL: 95-200kV
- Cooling: ONAN self-cooled
- Control: Microprocessor-based automatic control with SCADA compatibility
- Features: Arc-free tap changer, fully sealed tank, maintenance-free, high-creepage bushings for tropical environments
Ideal for long feeders in Ethiopian distribution networks, these regulators reduce losses, improve power quality, and ensure stable voltage under varying loads. Equipped with pressure relief valve, oil gauges, and position indicators.
Perfect for EEU projects requiring reliable overhead line voltage regulation. Custom ratings available per tender specifications.
|
Voltage(kV)
BIL(kV)
|
Load Current
(Amperes)
|
kVA
|
|
2.5 kV
60 kV BIL
|
200
300
400
500
668
1000
1332
1665
|
50
75
100
125
167
250
333
416
|
|
5.0 kV
75 kV BIL
|
100
150
200
250
334
500
668
833
|
50
75
100
125
167
250
333
416
|
|
7.62 kV
95 kV BIL
|
100
150
219
328
438
546
656
875
1093
|
76
114
167
250
333
416
500
667
833
|
|
13.8 kV
95 kV BIL
|
100
150
200
300
400
483
604
|
138
207
276
414
552
667
833
|
|
19.92 kV
150 kV BIL
|
50
100
167
200
335
418
502
|
100
200
333
400
667
833
1000
|
|
33 kV
200 kV BIL
|
50
100
200
|
165
330
660
|
Customization Optional
Single Phase Automatic Step Voltage Regulator
Our Single-phase Automatic Step Voltage Regulator offers extensive customization to meet diverse grid conditions, load requirements, and installation environments. Customers can select input voltage ranges (e.g., 120V–260V, 140V–280V, or wider), output precision (±1%, ±2%, or ±3%), and capacity from 5kVA to 100kVA. The number of regulation steps (8–32 steps) and regulation speed can be optimized for specific applications. Advanced digital controllers with RS485/Modbus communication, Wi-Fi/GSM remote monitoring, and programmable delay times are available for smart grid integration. Enclosure options include IP20 indoor, IP54 weatherproof, or outdoor pole-mounted designs with anti-corrosion coatings. Additional features such as surge arresters, manual bypass switches, high-temperature insulation upgrades, and custom LCD interfaces with data logging ensure full adaptability to regional standards and harsh operating conditions.
For specialized needs, we provide ultra-wide input range designs for unstable rural grids, high-overload models (up to 300% momentary), low-noise configurations for hospitals and offices, and integration with backup generators or solar systems. Custom color, branding, and multi-unit parallel operation capability further enhance flexibility. These tailored solutions make our automatic step voltage regulator the preferred choice for clients searching for “custom single-phase automatic voltage regulator with high overload capacity.”
Packing and Shipping
Single Phase Automatic Step Voltage Regulator
Secure packaging is critical for protecting the precision components of the Single-phase Automatic Step Voltage Regulator. Each unit is mounted on a reinforced wooden pallet with anti-vibration rubber pads and heavy-duty steel strapping to absorb shocks during transit. Sensitive electronic modules, LCD displays, and copper windings are protected with thick foam inserts and custom-molded plastic shields. The entire regulator is wrapped in multi-layer waterproof and anti-static film, with silica gel desiccants placed inside to control humidity. A sturdy, fumigated export wooden crate compliant with ISPM 15 standards fully encloses the product, reinforced with corner protectors and impact/tilt monitoring labels for complete traceability.
We offer flexible global shipping solutions tailored to project timelines and destinations. For international orders, sea freight in 20ft or 40ft containers ensures cost-effective and secure transport with professional blocking and bracing, typically taking 20–45 days. Air freight is available for urgent requirements, delivering within 5–10 days. Domestic and regional shipments utilize specialized trucks with GPS tracking and weatherproof tarping to guarantee safe delivery. All shipments are covered by comprehensive all-risk insurance up to the full product value.
Complete export documentation is provided, including commercial invoices, packing lists, certificates of origin, test reports, and compliance declarations to facilitate smooth customs clearance. Environmentally conscious practices such as recyclable packing materials and optimized load planning help reduce carbon footprint. Clients receive real-time tracking links and proactive updates from our dedicated logistics team.
Upon arrival, we offer optional professional unpacking guidance, on-site inspection support, and responsible disposal of packaging materials. For bulk or project orders, consolidated shipping and phased delivery options are available to minimize storage needs and project costs. This meticulous packing and shipping process ensures your automatic step voltage regulator arrives in perfect working condition, ready for immediate installation.
We offer flexible global shipping solutions tailored to project timelines and destinations. For international orders, sea freight in 20ft or 40ft containers ensures cost-effective and secure transport with professional blocking and bracing, typically taking 20–45 days. Air freight is available for urgent requirements, delivering within 5–10 days. Domestic and regional shipments utilize specialized trucks with GPS tracking and weatherproof tarping to guarantee safe delivery. All shipments are covered by comprehensive all-risk insurance up to the full product value.
Complete export documentation is provided, including commercial invoices, packing lists, certificates of origin, test reports, and compliance declarations to facilitate smooth customs clearance. Environmentally conscious practices such as recyclable packing materials and optimized load planning help reduce carbon footprint. Clients receive real-time tracking links and proactive updates from our dedicated logistics team.
Upon arrival, we offer optional professional unpacking guidance, on-site inspection support, and responsible disposal of packaging materials. For bulk or project orders, consolidated shipping and phased delivery options are available to minimize storage needs and project costs. This meticulous packing and shipping process ensures your automatic step voltage regulator arrives in perfect working condition, ready for immediate installation.
32
32 years of industry experience
Manufacturer Test
Single Phase Automatic Step Voltage Regulator
Progress Test
Manufacturing progress testing for the Single-phase Automatic Step Voltage Regulator begins with core material validation using Epstein frame and watt-loss testing to confirm low-loss silicon steel performance. Winding resistance and insulation strength are measured on the copper coils before assembly. Tap changer mechanism undergoes 10,000-cycle endurance testing for mechanical reliability. Initial control board calibration checks microprocessor accuracy, voltage sampling precision, and protection threshold settings. Early enclosure assembly includes IP rating verification and grounding continuity tests. These incremental checks, supported by digital traceability records, ensure foundational quality and high overload capacity during early production stages. Response time, output voltage precision, and waveform distortion are measured using precision power analyzers. Overload and short-circuit protection functions are rigorously tested at 150%–300% rated load. Thermal imaging confirms even heat distribution during continuous operation.
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 Single-phase Automatic Step Voltage Regulator starts with detailed input/output voltage accuracy verification across the full regulation range using calibrated voltage sources. No-load and full-load efficiency measurements confirm performance above 98%. Step switching response time and output voltage stability (±1–3%) are tested under sudden load changes. All protection functions—including over/under voltage, overload, short-circuit, and surge—are activated and validated. Control panel display accuracy, alarm functions, and communication interfaces (if equipped) are thoroughly checked. These routine electrical and functional tests, documented with waveforms and data sheets, establish baseline compliance. Advanced FAT includes extended overload testing at 150% rated capacity for 2 hours and short-time 200–300% overload simulation to verify thermal stability and automatic recovery. Harmonic distortion and power factor measurements are performed under different load types.
Routine Test - Impulse Tests
Purpose of Testing
The purpose of Impulse Tests is to verify the insulation strength of electrical equipment when it is subjected to lightning strikes or switching overvoltages. By applying high-energy impulse voltages, it is possible to detect potential defects in the insulation system.
Testing Equipment
Impulse voltage generator (e.g. Haefely, Hipotronics, Tettex, etc.)
Voltage divider (used to measure impulse voltage waveform, resistor divider or capacitor divider)
Oscilloscope (used to record impulse waveform, common brands such as Tektronix, Keysight)
Voltage divider (used to measure impulse voltage waveform, resistor divider or capacitor divider)
Oscilloscope (used to record impulse waveform, common brands such as Tektronix, Keysight)
Pre-Test Preparation
Please test under suitable environmental conditions: relative humidity less than 65%, no rain or condensation (recommended temperature: 15-30°C).
Calibrate and check the impulse voltage generator, measurement system, and control system to ensure that the instruments and equipment are in good condition and meet the test standards.
Calibrate and check the impulse voltage generator, measurement system, and control system to ensure that the instruments and equipment are in good condition and meet the test standards.
Test Progress
Connect the Test Instrument:
Connect the impulse voltage generator correctly to each winding terminal (high voltage terminal, ground terminal) of the device under test, and ensure that all test instruments are well grounded.
Apply Test Voltage:
Select the appropriate impulse voltage waveform and amplitude according to the rated voltage of the equipment
Connect the impulse voltage generator correctly to each winding terminal (high voltage terminal, ground terminal) of the device under test, and ensure that all test instruments are well grounded.
Apply Test Voltage:
Select the appropriate impulse voltage waveform and amplitude according to the rated voltage of the equipment
Measure and Record
Collect and record the impact waveform, including:
Front Time
Time to Half-Value
Peak Voltage
Distortion
Ambient temperature and humidity (especially when the test environment needs to be corrected)
Front Time
Time to Half-Value
Peak Voltage
Distortion
Ambient temperature and humidity (especially when the test environment needs to be corrected)
Waveform Correction
Check whether the impulse voltage waveform meets the specification requirements (wave head time 1.2μs ±30%, half-peak time 50μs ±20%).
If the waveform deviation is too large, adjust the impulse generator parameters and reapply the test.
If the waveform deviation is too large, adjust the impulse generator parameters and reapply the test.
Repeat Testing (if necessary)
Impact tests are performed for different phases and windings (HV/MV/LV).
In special cases, inter-winding impact, voltage-to-ground impact or coil corner impact are performed (according to the test plan).
In special cases, inter-winding impact, voltage-to-ground impact or coil corner impact are performed (according to the test plan).
Evaluation Criteria (Reference)
No internal insulation breakdown or flashover (detected by observing waveform continuity and audibly).
Waveforms are stable and meet standard specifications.
Waveform variations between repeated tests are minimal (usually good waveform overlap with no noticeable abnormal excursions).
Waveforms are stable and meet standard specifications.
Waveform variations between repeated tests are minimal (usually good waveform overlap with no noticeable abnormal excursions).
*These comprehensive tests ensure that each transformer meets performance standards and operates
reliably under various conditions.
Application
Ideal for small commercial shops, offices, medical clinics, and light industrial workshops, protecting sensitive equipment such as computers, servers, and CNC machines from voltage fluctuations.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
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