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Description
Description
The ABB GRID BREAKER UNIT GBU72 3BHB030310R0001 is a high-voltage generator circuit breaker(GCB)designed for the protection and control of large generators in thermal,combined-cycle gas turbine(CCGT),hydro,and renewable energy power plants.As a critical component in generator step-up(GSU)substations,the GBU72 safely connects and disconnects the generator from the high-voltage grid during normal operation,maintenance,and fault conditions.Engineered for extreme reliability and performance,this unit operates at 145 kV with a rated current of 3150 A and an impressive short-circuit interrupting capacity of 40 kA,ensuring robust protection against electrical faults.
Housed in SF6(sulfur hexafluoride)insulated enclosures,the GBU72 leverages ABB’s proven self-blast arc-quenching technology for fast,reliable interruption with minimal maintenance.The 3BHB030310R0001 designation refers to the specific configuration,control wiring,and auxiliary components tailored for seamless integration into ABB’s automation and protection systems.
Application Scenarios
At a 600 MW CCGT power plant in South Korea,operators faced repeated failures in generator synchronization due to aging generator circuit breakers with slow operating mechanisms and degraded insulation.The root cause was traced to moisture ingress and contact wear in the original GCBs,leading to delayed closing times and failed auto-reclosing attempts.The plant replaced the obsolete breakers with ABB GRID BREAKER UNIT GBU72 3BHB030310R0001 units.Immediately,synchronization success rates improved—closing time was reduced to≤45 ms,and opening time to≤35 ms,enabling precise grid connection during peak demand.During a system disturbance,the GBU72 successfully interrupted a 38 kA fault current without restrikes or contact damage.“The 3BHB030310R0001 didn’t just fix the sync issue—it gave us confidence in our entire generator protection scheme,”said the chief electrical engineer.This case highlights how modern GCBs enhance grid stability,reduce downtime,and extend equipment life in high-capacity power generation facilities.
Parameter
Main Parameters Value/Description
Product Model GBU72(Series)/3BHB030310R0001(Specific Unit Configuration)
Manufacturer ABB High Voltage Products
Product Category Generator Circuit Breaker(GCB)
Rated Voltage 145 kV–Suitable for medium to large power plants
Rated Current 3150 A–Continuous load capability
Short-Circuit Breaking Capacity 40 kA(RMS)–High fault current interruption
Operating Mechanism Spring-operated–Reliable,maintenance-friendly,fast response
Insulation Medium SF6(Sulfur Hexafluoride)–Excellent dielectric and arc-quenching properties
Closing Time≤45 ms–Fast grid synchronization
Opening Time≤35 ms–Rapid fault isolation
Rated Impulse Withstand Voltage 650 kV(peak)–High insulation strength
Control Voltage 110–220 VDC or 110–240 VAC–Flexible control power options
Mounting Outdoor or indoor GIS(Gas-Insulated Switchgear)installation
Standards IEC 62271-100,IEEE C37.04,ISO 9001–Global compliance
Lifetime>30 years/10,000 operations–Long service life with minimal maintenance
Technical Principles and Innovative Values
Innovation Point 1:Self-Blast Arc-Quenching Technology
The GBU72 uses ABB’s advanced self-blast interruption principle,where arc energy is harnessed to generate the pressure needed for arc extinction—eliminating the need for high-pressure gas reservoirs and reducing operating energy.
Innovation Point 2:Spring-Operated Mechanism for High Reliability
Unlike hydraulic or pneumatic systems,the spring mechanism is immune to fluid leaks and pressure drops,ensuring consistent performance even during black-start conditions.
Innovation Point 3:Optimized for Generator Duty(High X/R Ratio)
Generators produce fault currents with high DC offset(long time constant).The GBU72 is specifically designed to interrupt these asymmetric currents safely,meeting IEEE Std C37.013 requirements.
Innovation Point 4:Fast Closing for Grid Synchronization&Black Start
With a closing time of≤45 ms,the GBU72 enables precise phase matching during generator synchronization and supports fast restoration after outages.
Innovation Point 5:Integrated Monitoring&Predictive Maintenance
Optional sensors monitor contact wear,SF6 pressure,and mechanism health.Data can be fed into ABB’s Ability™Condition Monitoring systems for predictive maintenance and reduced unplanned outages.
Application Cases and Industry Value
A hydroelectric station in Switzerland upgraded its generator protection system by installing ABB GRID BREAKER UNIT GBU72 3BHB030310R0001 breakers.The plant required ultra-fast and reliable switching for frequent load changes and emergency shutdowns.After commissioning,the GBU72 units demonstrated exceptional performance—successfully performing over 500 reclosing operations during seasonal peak loads without degradation.The SF6 insulation remained stable in the alpine environment(-25°C to+40°C),and the spring mechanism operated flawlessly during multiple black-start drills.Over five years,the breakers achieved 100%availability.“The 3BHB030310R0001 is not just a breaker—it’s a grid stability asset,”said the plant manager.This case demonstrates how high-performance GCBs enhance operational flexibility,safety,and lifecycle efficiency in modern power systems.
Related Product Combination Solutions
ABB REL670/REG670–Generator Protection Relay–Provides differential,overcurrent,and loss-of-excitation protection,interfacing with GBU72 trip/close commands.
ABB MCBM(Mechanical Condition Based Monitoring)–Monitors operating time,contact travel,and spring charge for predictive maintenance of GBU72.
ABB SDA(Switchgear Diagnostic Assistant)–Online SF6 monitoring system–Tracks gas density,moisture,and leakage in GBU72 enclosures.
ABB ZX2/ZX1.2–Medium Voltage Switchgear–Complements GBU72 for auxiliary and station service power.
ABB Ability™Smart Sensor for Switchgear–IoT-enabled monitoring–Enables remote health assessment of GBU72.
ABB OHS(Outdoor High Voltage Switchgear)–Complete outdoor installation package–Includes disconnectors,earthing switches,and CTs for GBU72.
ABB DCS&HMI Systems(Symphony Plus)–Supervisory control and data logging–Integrates breaker status and alarms into central control.
ABB SF6 Gas Handling Units–For maintenance,filling,and recycling of SF6 in GBU72 during servicing.
Installation,Maintenance,and Full-Cycle Support
The ABB GRID BREAKER UNIT GBU72 3BHB030310R0001 is typically installed as part of a generator switchyard or GIS substation.Installation must be performed by certified high-voltage engineers following ABB’s technical guidelines.Key steps include foundation alignment,SF6 gas filling,control wiring,and integration with protection relays.Post-installation,a series of mechanical and electrical tests(e.g.,contact resistance,timing,insulation resistance)are required before energization.
Routine maintenance is minimal due to the sealed SF6 design and robust spring mechanism.ABB recommends:
Annual inspection:Check SF6 pressure,control circuit integrity,and auxiliary contacts.
Every 5 years:Perform contact resistance measurement and mechanism lubrication.
Every 10,000 operations or 15 years:Major overhaul(optional,based on condition monitoring).
ABB provides comprehensive lifecycle support,including spare parts,technical documentation,retrofit kits,and digital monitoring solutions.For end-of-life units,ABB offers SF6 recycling and responsible decommissioning.
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