3 Phase 30kVA Servo Motor AVR

For the factory chief engineer and the equipment maintenance supervisor, when planning the power system, "space" and "power" are always a pair of conflicting factors that require careful consideration. Especially in the urban industrial parks where land is scarce, the area of the distribution room is often fixed during the construction of the factory buildings, and the subsequent expansion of the civil engineering costs are extremely high and the process is lengthy.

The 3 Phase 30KVA Servo Motor AVR can effectively solve this problem. It shares the exact same chassis size, the same installation base hole positions, and the same incoming and outgoing terminal layout with the lower-capacity SBW-20KVA, but it accommodates a larger-sized compensation transformer and voltage regulating coil. The rated output capacity increases from 20KVA to 30KVA.

This means that when your production line upgrades from a 15-18KW load to a 22-27KW load, you don't need to contact the construction team to knock down walls and drill holes, don't need to re-make the foundation steel bars of the distribution cabinet, or worry about whether the original incoming and outgoing cables are too short. Just pull out the 20KVA whole machine, push it in place as 30KVA, and reconnect the cables to complete the "capacity leap-like" upgrade.

Product Parameter

Performance advantages

The rated capacity of 30KVA corresponds to a rated current of approximately 46A (three-phase 380V), which can cover the entire assembly line of small and medium-sized factories, large screw-type air compressors (37KW level), 200-300 ton injection molding machine heating and hydraulic systems, as well as large-power central air conditioning units in shopping malls and office buildings.

The starting current of the motor can reach 7-8 times the rated current. Ordinary electronic voltage stabilizers are prone to error bypass or damage due to instantaneous overcurrent. While the SBW-30KVA adopts electromagnetic induction servo regulation, there is no risk of power semiconductor device overcurrent breakdown. Its transformer and carbon brush components have extremely strong short-term overload capacity, which can calmly cope with the severe tests brought by the frequent start-stop of large motors.

In addition, the 3 Phase 30KVA Servo Motor AVR adopts three-phase phase-by-phase independent regulation technology. Even in heavy-load conditions where the three-phase current is unbalanced, it can stabilize the output voltage of each phase within ±3% accuracy. The intelligent temperature-controlled fan is combined with the high-grade A-level insulation system to ensure continuous 24-hour operation at full load in an environment of 40℃, making it a truly "industrial-grade heavy-duty player".

Key Features

1. Ultra-high power density

The external dimensions are 500×380×670mm, exactly the same as the 20KVA model, but with a capacity increase of 50%. The power density is industry-leading, especially suitable for renovation and upgrade projects in distribution rooms with limited space and no expansion possibility. The installation holes and wiring terminals are consistent, enabling quick replacement within minutes.

2. High impact load tolerance

Specially optimized for inductive loads such as high-power motors, compressors, and hydraulic pumps, 3 Phase 30KVA Servo Motor AVR can withstand short-term impact currents exceeding the rated current by 8 times without tripping or bypassing, ensuring the smooth startup of heavy-load equipment and avoiding production interruptions caused by startup voltage drop.

3. Long-term stability under heavy load conditions

Using thickened compensation transformer coils and larger-sized brush components, the rated current carrying capacity is increased to 46A, with lower heat generation. The net temperature rise is less than 60°C, and combined with a forced air cooling system, it can perform continuous three-shift operations in high-temperature and dusty industrial environments.

4. Independent three-phase high-precision regulation

The sampling circuit independently detects and drives each phase voltage, even when the three-phase load is severely unbalanced (such as connecting a large amount of single-phase lighting and three-phase power simultaneously), it can independently stabilize each phase output within ±3% to effectively protect voltage-sensitive PLCs, servo drives, and precision temperature control instruments.

5. High-reliability electromagnetic topology structure

Different from all-electric voltage stabilizers, this machine adopts a servo motor + column-type voltage regulator structure, without vulnerable power switching devices, with strong resistance to lightning surges, and suitable for remote industrial areas with poor grid quality (severe harmonics, drastic voltage fluctuations). The designed service life exceeds 15 years, with an extremely low failure rate throughout the entire life cycle.

6. Comprehensive system-level protection and bypass

Integrated six-layer protection including overload, overvoltage, undervoltage, short circuit, overheating, and phase loss, and built-in mechanical/electrical dual bypass functions. When an internal anomaly occurs, it automatically seamlessly switches to direct power supply from the mains, ensuring that critical loads are never powered off, while the panel emits audible and visual alarm indications.

7. Flexible interface expansion capability

Standard configuration includes digital LED three-phase voltage display; optional RS485 communication interface, supporting Modbus-RTU protocol, can be connected to factory DCS systems or energy management platforms (EMS), enabling remote monitoring, voltage trend recording, and fault warning.

Product Applications

1. Centralized power distribution management for small and medium-sized factories: Installed at the main incoming cabinet of the workshop, it provides centralized voltage stabilization for the entire production line (numerical control machine groups, welding equipment, lifting equipment), improving the power quality of the entire workshop.

2. Large-scale injection molding and die-casting industry: Provides stable power supply for the heating rings and hydraulic oil pump motors of 200T to 350T injection molding machines, preventing voltage fluctuations from causing uncontrolled heating temperatures or unstable injection pressure, and reducing the scrap rate.

3. Compressed air system: Equipped with 37KW and below screw air compressors and piston air compressors, it solves the problem of large current impact during startup, ensuring stable pressure of the compressed air system and protecting contactors and thermal relays.

4. Commercial large-scale HVAC system: Suitable for central air conditioning water-cooled units, cooling tower fans, and circulating water pumps in large-scale shopping malls, hotels, and office buildings, providing stable voltage power supply to avoid compressor overheating protection tripping due to low voltage.

5. Metal processing and sheet metal forming: Provides pure power supply for the hydraulic systems and CNC controllers of large shearing machines, bending machines, and punching machines, ensuring processing accuracy and mold lifespan.

6. Water treatment and municipal facilities: Used in large power stations for water pumps, aeration fans in sewage treatment plants, and municipal drainage pump stations, etc., to ensure the stable operation of public infrastructure.

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. The SBW-30KVA and the 20KVA have exactly the same dimensions. How is the capacity increase achieved internally?

Without changing the cabinet frame, we enhance the energy conversion density per unit volume by optimizing the magnetic materials (using high-permeability high-performance silicon steel sheets) and improving the coil winding process. At the same time, we strengthen the heat dissipation air duct design to ensure that the temperature rise remains within the standard range. This "small size, high power" design has been fully verified in mature mass-produced models.

2. My factory was originally using a 20KVA stabilizer. Now the load has increased. Can I directly replace it with this 30KVA one?

In most cases, it is possible. The installation base hole dimensions and the spacing between input/output copper strips of the two are exactly the same. However, please note to confirm whether the specifications of the front-end incoming cable and circuit breaker are sufficient - the rated current of the 30KVA is approximately 46A. It is recommended to use a ≥63A circuit breaker and a ≥10mm² copper core cable at the front end. Our technical team can provide on-site inspection services before the replacement.

3. How does the 30KVA handle the impact current during the start-up of large motors?

The servo motor type voltage regulator is essentially a large variable transformer. Its electromagnetic inertia determines that it allows short-term overload. The sliding contact between the carbon brush and the coil can withstand several times the rated current instantaneous impact. The control circuit will delay judgment and will not trigger overcurrent protection like the electronic stabilizer. As long as the impact current drops within 5 seconds, the stabilizer can remain in normal operation.

4. Can the 3 Phase 30KVA Servo Motor AVR really achieve an efficiency of 96%? Is it still energy-efficient under light load conditions?

Yes, under full-load operation, the efficiency is ≥96%. Under light load (40% - 60% load rate), due to the relative increase in iron loss, the efficiency will slightly drop to around 93% - 95%, but it is still much higher than traditional magnetic saturation stabilizers. We recommend keeping the load rate within the range of 50% - 80% to achieve the best overall energy efficiency.

5. How does the three-phase independent regulation work?

Inside the equipment, there are three completely independent sampling transformers, control circuit boards, and servo motor drive mechanisms. When the voltage of phase A is low, only the carbon brush on phase A is moved upward for supplementary pressure, while phases B and C are not affected at all. This ensures the complete decoupling regulation of the three-phase output voltage. Even if the three-phase load on the user side is severely unbalanced, the three-phase voltage at the output end still maintains a high symmetry.

6. What are the main daily maintenance tasks for the equipment?

The daily maintenance is very simple: every quarter, check and clean the carbon brush dust (using a vacuum cleaner to remove it from the ventilation port), every half year, check if the carbon brush length has worn below the marking line, and tighten the screws of the incoming and outgoing terminal once a year. Compared to electronic equipment that requires regular detection of electrolytic capacitor capacity, the maintenance volume and spare parts cost of the SBW series are highly advantageous.