AUTOMATIC VOLTAGE REGULATOR (AVR)
NISHISHIBA ELECTRIC CO.,LTD
Refurbished
The NISHISHIBA VZRAB-4A(PT)DSGS Automatic Voltage Regulator (AVR) is a specialized generator voltage control unit designed for marine and industrial alternator applications. The unit is responsible for maintaining stable generator output voltage by automatically controlling excitation current supplied to the generator field winding. Automatic Voltage Regulators are essential components in modern marine power generation systems and ensure reliable electrical power distribution throughout the vessel. NISHISHIBA Electric has long been recognized as a manufacturer of generator control and power regulation equipment for marine and industrial applications.
The VZRAB series AVR is commonly installed on shipboard diesel generators where voltage stability is critical for navigation equipment, automation systems, communication systems, engine monitoring systems, cargo handling systems, and hotel loads. By continuously monitoring generator output voltage and automatically adjusting excitation levels, the AVR maintains constant voltage despite varying electrical loads.
Reliable voltage regulation is particularly important onboard ships where fluctuations can negatively affect sensitive electronic equipment and reduce generator performance. The NISHISHIBA VZRAB-4A series provides dependable generator voltage control and contributes significantly to vessel operational safety and electrical reliability.
The NISHISHIBA VZRAB-4A(PT)DSGS functions as the central voltage regulation device within the generator excitation system. The AVR continuously measures generator terminal voltage and compares it with a preset reference value. When generator voltage deviates from the desired level, the regulator automatically adjusts excitation current supplied to the generator field winding.
This closed-loop control process allows the generator to maintain a stable output voltage during varying load conditions, motor starting events, sudden load changes, and parallel generator operation.
The VZRAB series incorporates:
Documentation for the VZRAB family confirms compatibility with VZRAB-4A configurations and includes wiring arrangements for single CT, double CT, and cross-current compensation systems used in marine generators.
The model shown in the image is rated for marine generator applications and is designed to integrate directly with NISHISHIBA generator control systems. Commercial references identify VZRAB-4A(P) variants as 450V generator voltage regulators.
The primary function of the VZRAB-4A is to automatically maintain generator output voltage within specified operating limits regardless of load variations. This ensures stable electrical power distribution throughout the vessel.
The AVR continuously controls excitation current supplied to the generator rotor field winding. Proper excitation control improves generator performance, efficiency, and voltage stability.
The VZRAB series supports generator load sharing and parallel operation through cross-current compensation functions. This feature is critical for vessels operating multiple generators simultaneously.
NISHISHIBA AVRs are specifically designed for demanding marine environments where continuous operation and electrical reliability are essential.
The front-panel damping adjustment allows optimization of voltage response characteristics and generator stability under dynamic load conditions. This feature helps minimize oscillation and improve voltage regulation performance.
The VZRAB-4A is designed for direct integration with marine alternators and generator control panels, simplifying installation and replacement procedures.
The AVR utilizes solid-state electronic control technology for improved reliability, fast response, and reduced maintenance requirements compared with older electromechanical regulators.
| Parameter | Specification |
|---|---|
| Product Name | Automatic Voltage Regulator |
| Model | VZRAB-4A(PT)DSGS |
| Manufacturer | NISHISHIBA Electric Co., Ltd. |
| Equipment Type | Generator Automatic Voltage Regulator |
| Function | Generator Voltage Control |
| Application | Marine Alternator Excitation System |
| Generator Type | Marine Diesel Generator |
| Voltage Rating | 450V (series reference) |
| Control Method | Solid-State Electronic Regulation |
| Parallel Operation | Supported |
| Cross Current Compensation | Supported |
| Installation | Generator Control Panel |
Technical specifications may vary depending on exact model revision and vessel configuration. Available references confirm VZRAB-4A family compatibility and 450V-rated variants.
The NISHISHIBA VZRAB-4A(PT)DSGS AVR is widely used in marine power generation systems onboard:
Provides stable generator voltage for propulsion auxiliaries, cargo systems, navigation equipment, and accommodation loads.
Supports reliable electrical power generation during loading, unloading, and voyage operations.
Maintains stable power for cargo pumps, control systems, and safety equipment.
Ensures continuous operation of automation and cargo handling systems.
Provides voltage regulation for critical electrical and control systems.
Supports reliable generator performance under varying operational loads.
Used in dynamic positioning systems, drilling support vessels, and offshore production facilities.
Ensures high-quality electrical power for passenger services and hotel systems.
Provides stable voltage supply for sensitive scientific equipment.
Supports reliable power generation for onboard processing and refrigeration systems.
The AVR integrates with:
SM MARINE SERVICE™ provides sourcing and supply support for:
Both replacement units and reconditioned equipment may be available depending on stock availability and customer requirements.
SM MARINE SERVICE™ provides complete support services for NISHISHIBA Automatic Voltage Regulators.
Diagnosis of:
Professional repair services for AVR modules, control circuits, power electronics, sensing circuits, and excitation control assemblies.
Adjustment and verification of voltage regulation parameters and generator performance characteristics.
Functional testing under simulated generator operating conditions.
Complete inspection, refurbishment, component replacement, and operational verification.
Support may be available for:
Our engineers provide workshop repair services and onboard attendance worldwide for troubleshooting, testing, calibration, commissioning, and generator automation support.
SM MARINE SERVICE™
Bangladesh Office
Samir Market, DT Road, Pahartali, Beside CDA Market, Chattogram, Bangladesh
China Warehouse and Support Center
Shanghai, China
SM MARINE SERVICE™ supplies both New Equipment and Reconditioned Equipment depending on customer requirements and budget.
We provide worldwide supply, sourcing, repair, calibration, technical support and spare parts services for marine automation, navigation, communication and marine electronic systems.
Website : https://www.smmarineservice.com
Email : info@smmarineservice.com
WhatsApp and Viber : +8801818929292
Marketing Contact: Nazmul Hasan Bhuiyan
Mobile WhatsApp and Viber : +8801730296909
The NISHISHIBA VZRAB-4A(PT)DSGS Automatic Voltage Regulator is a critical component within marine generator excitation systems, ensuring stable voltage regulation, reliable generator performance, and dependable electrical power distribution throughout the vessel. Its support for excitation control, parallel generator operation, and voltage stabilization makes it a trusted solution for marine power generation applications.
For NISHISHIBA VZRAB-4A(PT)DSGS AVR supply, repair, calibration, troubleshooting, spare parts, technical documentation support, reconditioned equipment, onboard attendance, and worldwide marine services, contact SM MARINE SERVICE™. We provide professional marine electrical and generator automation support for shipowners, ship managers, chief engineers, and marine operators worldwide.
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