3 Phase 50kVA SCR Static AVR

3 Phase 50KVA SCR Static AVR uses a high-speed DSP computing chip as the control core to monitor the changes in three-phase input voltage in real time. When the grid voltage fluctuates, the DSP system calculates the required compensation voltage within milliseconds and performs contactless rapid switching compensation through the SCR (thyristor) module, thereby achieving instantaneous voltage stability of the output. The entire process does not require any mechanical moving parts, completely eliminating the troubles of carbon brush wear, spark generation, and regular replacement.

Product Parameter

Key Features

1. No contact control

The SCR module is used to achieve rapid compensation and regulation of voltage. The entire machine has no any mechanical moving parts (no carbon brushes, no servo motors). This completely eliminates the maintenance pain points of traditional voltage regulators such as carbon brush wear, sparking, and regular replacement, achieving true maintenance-free operation and significantly reducing the full life cycle operation cost.

2. DSP digital control

Using a DSP computing measurement chip as the control core, combined with fast AC sampling technology and effective value correction technology, it can monitor the changes in grid voltage in real time. The response speed can reach 10ms to 40ms (adjustable), and it can complete regulation within milliseconds of grid fluctuations, ensuring instantaneous stability of the output voltage, especially suitable for equipment with sensitive voltage transients.

3. High voltage stabilization accuracy

The phase voltage stabilization accuracy is ±1%, and the line voltage accuracy is ±1.5%. The output waveform distortion rate is less than 0.1%, without generating incremental harmonics, providing pure and stable power supply guarantee for precision instruments, medical equipment, and numerical control systems.

4. High efficiency

The 3 Phase 50KVA SCR Static AVR efficiency is ≥99%, much higher than the 96% of traditional servo-type voltage regulators. The self-loss is extremely low, and long-term operation can significantly reduce energy consumption costs, meeting the requirements of enterprises for energy conservation and emission reduction and green production.

5. Zero current switching technology

Using zero current switching technology, the SCR module is turned on and off at the zero current point, effectively avoiding the current shock and voltage spike during the switching moment, improving the safety and reliability of equipment operation.

6. Programmable protection and intelligent monitoring

Users can set the overvoltage, undervoltage, overcurrent protection thresholds and voltage stabilization accuracy through programming. The built-in multiple protection functions such as overload, overvoltage, undervoltage, short circuit, overheating, and phase loss, as well as the automatic bypass function. The digital LED display shows the three-phase voltage, current, and power in real time, and the operating status is clear at a glance.

7. E-class insulation, high withstand voltage strength

The insulation grade reaches E-class, and the insulation strength can withstand AC 2500V/1min without flashover or breakdown. The product operating temperature range is -5℃ to 40℃, relative humidity is less than 90%, and it is suitable for various industrial site environments.

Product Applications

1. Industrial automation production line: Provides high-speed stable voltage power supply for PLC control systems, servo drives, robot workstations, and automated assembly lines, preventing equipment alarms, shutdowns, and production disruptions caused by voltage transients.

2. Large-scale mechanical and metal processing equipment: Suitable for large power processing equipment such as large machine tools, laser cutting machines, plasma cutting machines, and stamping equipment, providing stable voltage power supply to ensure processing accuracy and equipment safety.

3. Medical facilities: Provides high-precision, high-purity stable power supply for hospital imaging centers (CT, MRI), operating room equipment, and precision instruments in the laboratory, ensuring diagnostic quality and patient safety.

4. Communication base stations and data centers: Used for switch power supplies and front-end of precision air conditioners in 5G communication base stations and small and medium-sized data centers， ensuring that communication equipment does not crash due to voltage fluctuations.

5. Elevators and building equipment： Provides stable power supply for key equipment such as elevator systems， central air conditioning， and fire pumps in high-rise buildings， avoiding equipment failures and safety hazards caused by abnormal voltages.

6. Research and testing institutions： Provides high-precision stable voltage power supply for environmental test chambers， precision measuring instruments， and high-power testing equipment in university laboratories， quality inspection centers， and research institutes， ensuring the accuracy and repeatability of experimental data.

What are the differences and advantages compared to traditional servo motor type voltage regulators?

With the continuous improvement of modern industrial automation and precision manufacturing levels， more and more electrical equipment has higher requirements for power supply quality， not only requiring stable voltage， but also being able to respond instantly to voltage fluctuations to avoid PLC program disorders， servo drive alarms， and measurement deviations of precision instruments. Although traditional servo motor type voltage regulators have reliable performance， their mechanical carbon brush adjustment method determines that the response speed has a physical limit (usually within seconds)， which is difficult to meet the requirements of high-end loads that are sensitive to voltage transients.

The 3 Phase 50KVA SCR Static AVR has a voltage regulation accuracy of ±1%， far superior to the ±3% of traditional servo type voltage regulators. Its response speed can reach up to 10ms， completing the adjustment action within the first cycle of grid voltage fluctuations， ensuring that sensitive equipment at the back end hardly feels voltage changes.

In terms of efficiency， the product efficiency is ≥99%， and it can save considerable electricity expenses for enterprises over the long term.

In terms of intelligence， SBWZ-50KVA is equipped with programmable setting functions. Users can set the overvoltage， undervoltage， overcurrent protection thresholds， and voltage regulation accuracy parameters according to actual on-site needs. The digital LED display can display real-time operating data such as three-phase phase voltage， phase current， and power. The product supports three-phase five-wire connection (L1， L2， L3， N， PE)， and is compatible with 50/60Hz dual-frequency grids.

Customization Services

KTAC provides OEM/ODM services, including appearance color, packaging method, input/output voltage range, and special function modules (such as EMI filter devices, lightning protection devices, RS232/RS485 monitoring interfaces), etc. Please contact us for customized solutions.

FAQ

1. What are the essential differences between the SBWZ series and the traditional SBW servo motor voltage stabilizer?

The SBWZ series adopts DSP digital control and SCR contactless switch technology, and the entire machine has no mechanical moving parts (no carbon brushes, no servo motors). While the traditional SBW series relies on servo motors to drive the carbon brushes to slide on the transformer coils to regulate voltage, it has problems of mechanical wear and slow response speed. The response speed of SBWZ can reach 10ms to 40ms, which is tens of times faster than that of the SBW series (second-level); the voltage stabilization accuracy of ±1% is also much better than that of the SBW series' ±3%.

2. What does "contactless" mean? What are the advantages?

"Contactless" means that during the voltage regulation process of the voltage stabilizer, there are no mechanical contact components (such as the sliding contact between the carbon brush and the coil). Voltage compensation is completed through the SCR thyristor module in an electronic switching manner. The advantages include: no mechanical wear, no maintenance, no sparks, fast response speed, long lifespan, high reliability, and suitability for long-term continuous operation.

3. What does the response speed of 10ms to 40ms mean in practical applications?

It means that when the grid voltage fluctuates, the SBWZ-50KVA can complete the detection, calculation and compensation process within one grid cycle (20ms). For sensitive devices at the back end (such as PLC, servo drives, precision instruments), there is almost no voltage change, and the equipment can operate continuously without alarms or shutdowns due to voltage transients.

4. How is the efficiency of 3 Phase 50KVA SCR Static AVR ≥ 99% achieved?

The SBWZ series adopts a design scheme combining SCR contactless switch technology and efficient isolation transformers. The conduction voltage drop of the SCR module is extremely low, and the conduction loss is much less than the loss of traditional carbon brush contact resistance; at the same time, the DSP control algorithm optimizes the compensation strategy, enabling the transformer to always operate in the efficient range. The comprehensive efficiency can reach over 99%, significantly more energy-efficient than traditional servo-type voltage stabilizers (about 96%).

5. What parameters can the programmable setting function set?

Users can set the overvoltage protection threshold, undervoltage protection threshold, overcurrent protection threshold, and voltage stabilization accuracy and other key parameters through the device panel or communication interface. This enables the SBWZ-50KVA to flexibly adapt to different grid environments and load requirements, and complete parameter matching quickly at the construction site without factory presetting.

6. What communication protocols and monitoring methods does the equipment support?

The standard configuration supports RS485 communication interface, and the Modbus-RTU protocol can be expanded. The equipment can be connected to the factory DCS system, SCADA system or energy management platform (EMS) to achieve remote real-time monitoring of voltage, current, power and alarm status, supporting unmanned operation and predictive maintenance.