The ABB 3BHE030579R0003 is the brains of the UNITROL 1020 excitation system!Designed specifically for synchronous generators,this high-performance excitation regulator offers precise voltage regulation,fast response,and strong interference immunity.It is widely used in critical power supply systems such as power plants,ships,and oil fields.Genuine quality ensures immediate,reliable operation,and is the cornerstone of generator set safety.
Supply Voltage:24VDC/220VAC(selectable)
Control Mode:AVR(Automatic Voltage Regulation),PSS(Power System Stabilizer)
Communication Interface:RS-485,Modbus RTU
Operating Temperature:0°C to+55°C
Protection Rating:IP20(Requires installation in a control cabinet)
Technical Specifications
Product Model:3BHE030579R0003
Manufacturer:ABB
Product Type:UNITROL 1020 Excitation Regulator Control Module
System:ABB UNITROL 1000 Series Excitation System
Core Functions:Automatic Voltage Regulation(AVR),Power System Stabilizer(PSS),Reactive Power Control
Supply Voltage:24VDC or 100–240VAC(auto-sensing)
Power Consumption:≤10W
Input Signal:Three-phase voltage(PT signal),rotor current(CT signal)
Output Signal:±10V Analog to power unit(triggering thyristors)
Communication interface:1 x RS-485,supports Modbus RTU protocol
Control accuracy:≤±0.5%of rated voltage
Response time:<1ms(step response)
Operating temperature:0°C to+55°C
Storage temperature:-40°C to+80°C
Protection rating:IP20
Mounting:DIN rail(TS-35 standard)
Certifications:CE,UL,CSA,IEC 61010-1,IEC 60255
Product Overview
Hey friends,today we’re talking about the ABB 3BHE030579R0003,officially known as the UNITROL 1020.It’s the flagship of ABB’s excitation systems!This isn’t just any control board;it’s a digital Automatic Voltage Regulator(AVR)designed specifically for synchronous generators.Essentially,it manages the generator’s voltage woes.
Just imagine:upon startup,the voltage fluctuates wildly,overwhelming the power grid and potentially damaging equipment.This is where the UNITROL 1020 comes in.It monitors key parameters like the generator terminal voltage and rotor current in real time.Using high-speed calculations,it dynamically adjusts the excitation current,keeping the voltage firmly fixed at the set value,with fluctuations within±0.5%.This accuracy is incredible!
This unit,part of ABB’s UNITROL 1000 series,is a perfect match for small and medium-sized generator sets(e.g.,under 10MW).Whether it’s thermal,hydropower,or diesel generators,or even marine power plants or oilfield backup power,any synchronous generator requires it.It not only stabilizes voltage but also operates as a power system stabilizer(PSS)to suppress low-frequency oscillations and improve overall grid stability.It’s no exaggeration to call it the”stabilizing force”of a generator set.
Main Features and Advantages
The 3BHE030579R0003 module’s greatest strengths are its speed,accuracy,and stability.It utilizes a high-speed digital signal processor(DSP),boasts a high sampling frequency,advanced control algorithms,and a step response time of less than 1 millisecond.What does this mean?Even if the grid voltage suddenly drops by 10%,it instantly increases the excitation current,bringing the voltage back up,with no noticeable fluctuations to the on-site equipment.
Secondly,it supports multiple control modes.The most commonly used is AVR mode for voltage stabilization;there’s also FCR mode(excitation current control)for manual commissioning;and even more impressive is PSS mode,which can identify low-frequency oscillation signals(0.1–2.0 Hz)from the grid and actively inject reverse damping to prevent the system from drifting.This is a life-saving feature in isolated or weak grid conditions.
Furthermore,it boasts exceptional self-diagnostic capabilities.The module features built-in LED indicators for clear indication of power,operation,and alarm status.Connecting to a computer via the RS-485 interface and using ABB’s dedicated software(such as Unitrol Toolbox)allows for easy access to all measured values,setpoints,fault records,and event logs,expediting troubleshooting.It also records Sequence of Events(SOE)with millisecond accuracy,providing comprehensive documentation for incident analysis.
Finally,it offers excellent compatibility and scalability.Its±10V analog output signal can directly drive ABB’s own power stacks and is also compatible with third-party thyristor trigger boards.Modbus RTU communication allows for easy integration into DCS or SCADA systems for remote monitoring.DIN rail mounting with clear terminal blocks ensures easy maintenance.
In essence,the ABB 3BHE030579R0003 UNITROL 1020 is a high-performance digital excitation regulator engineered for reliable and precise control of synchronous generators.Delivering exceptional voltage regulation accuracy(±0.5%)and ultra-fast response(<1ms),it ensures stable power output even under dynamic grid conditions.Its integrated Power System Stabilizer(PSS)actively function damps low-frequency oscillations,enhancing overall grid stability—critical for islanded or weak networks.Designed for robustness and ease of integration,the UNITROL 1020 supports multiple control modes(AVR,FCR,PSS),offers comprehensive self-diagnostics,and features Modbus RTU communication for seamless SCADA/DCS connectivity.Built to industrial standards with wide input voltage range and proven reliability,it is the ideal solution for diesel generators,hydro units,and industrial backup power systems demanding uninterrupted,high-quality electrical supply.
Application areas
This UNITROL 1020 There are countless applications for this device.The most common application is diesel generator sets,especially as emergency backup power sources in data centers,hospitals,and airports.Once the mains power goes out,the generator must connect to the grid within 0.5 seconds,and the voltage must remain stable,otherwise even the UPS will struggle.The 3BHE030579R0003 can handle these”golden 30 seconds.”
There are also hydroelectric power stations,especially small hydropower stations in mountainous areas,where the grid is weak and the load fluctuates greatly.The UNITROL 1020’s PSS function is invaluable,preventing”oscillation load shedding”after the generator is connected to the grid.It’s also commonly used in self-contained power plants in oil fields and mines,despite the harsh environments,but this device is tough and can withstand them.
On ships,both the main and emergency generators rely on it for voltage regulation.When a ship sways at sea,unstable voltage can disrupt radar and communication equipment.The UNITROL 1020’s high noise immunity makes it ideal for these complex operating conditions.
Even some wind farm diesel maintenance power supplies and communication base station backup power systems—as long as the synchronous generator is used—the 3BHE030579R0003 is capable.
Selection Guide/Purchasing Recommendations
Before purchasing the 3BHE030579R0003,you must first understand your generator’s specifications.The rated voltage,rated current,and excitation method(brushless?Static thyristor?)must all match.This module is the”brains,”but it also requires the”hands and feet”—the power unit and instrument transformers.ABB has a matching UNITROL 1010 power module.If you’re using a non-ABB power unit,you’ll need to confirm that the interface signals match.
Secondly,consider the power supply.This module supports both 24VDC and 100–240VAC power supply methods.You must select the correct version based on your site’s power supply.Don’t expect to find the voltage incorrect after purchase—that would be embarrassing.
Furthermore,do you need PSS functionality?If your unit is grid-connected,especially when connected to a weak or isolated grid,it’s strongly recommended to enable PSS.However,PSS parameters should be adjusted by a professional;don’t tinker with them.
Finally,and most importantly,ensure genuine products!Some”imitation”modules on the market have the same housing but fake chips,resulting in poor stability and potential failure at critical moments.Our products are guaranteed to be from genuine suppliers,unopened,with factory inspection reports and a three-year warranty,ensuring peace of mind and peace of mind.
Frequently Asked Questions(FAQs)
Q:Can the UNITROL 1020 be used in a brushless excitation system?
A:Yes!The 3BHE030579R0003 is highly versatile and can be used in both static thyristor excitation systems and brushless excitation systems(using a rotating rectifier).Simply connect the correct wiring and set the parameters.
Q:If the module alarms,can the generator still generate power?
A:It depends on the type of alarm.If the fault is minor(such as a PT disconnection),manual operation may be required.If the fault is severe(such as a thyristor failure),protection will activate,de-excitation,and the generator will shut down due to demagnetization.Please refer to the alarm code for details.
Q:Is remote monitoring supported?
A:Yes.Using the Modbus RTU protocol over RS-485,data such as voltage,current,power,and alarm status can be transmitted to the SCADA system in the central control room,enabling unmanned operation.
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