This device is used for reactive power compensation and power factor correction, suitable for 50/60Hz AC systems. It can be integrated with ABB ACS800 and ACS6000 medium-voltage frequency converters, and is designed for three-phase connections.  Internal components are equipped with fuses for automatic fault protection.  In substations, it serves as a reactive power compensation unit, improving the power factor (target ≥0.9), reducing line losses, and enhancing voltage quality.

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　　3BHE048994R0001 Other Names:

　　Control Unit 3BHE048994R0001

　　3BHE048994R0001 Input/Output Unit

　　Analog Unit 3BHE048994R0001

　　Key Parameters and Functions

　　Model Related Information:

　　GBU72: Part of the ABB power grid circuit breaker unit series, rated voltage 72.5kV, rated current up to 3150A, insulation level 170kV, interrupting capacity 25kA. Supports overload, short-circuit, undervoltage protection and arc-extinguishing functions, response time <1μs.

　　3BHB Series: Includes IGCT/IGBT module drivers (e.g., 3BHB030310R0001), rated voltage 4500V, current 4000A, used in applications such as rail transportation, wind power converters, and industrial drives.

　　Capacitor Characteristics:

　　High-voltage shunt capacitor, used for reactive power compensation and power factor correction, suitable for 50/60Hz AC systems.

　　Structure includes a casing, core (all-film dielectric element), and terminal bushings; with built-in fuse and discharge resistor (voltage drops below 75V within 10 minutes).

　　Environmental Adaptability: Temperature -25℃~+40℃, altitude ≤1000m, no conductive dust or explosive gases. Application Scenarios

　　Power Systems: Power grid circuit breaker units, reactive power compensation devices, power distribution and protection.

　　Industry and Energy: Subway traction converters, wind power converters, medium-voltage frequency converters (e.g., ACS6000), string-type photovoltaic inverters (TRIO-TM series).

　　Special Applications: High-voltage direct current transmission, data center power management, and drive systems for metallurgical/mining equipment.

　　Key Technical Features

　　Protection Mechanism: Integrated overcurrent, overvoltage, and undervoltage fault detection; supports rapid and safe shutdown; communicates with the main controller (e.g., AC 800PEC) via fiber optic, compatible with MODBUS protocol.

　　Heat Dissipation and Installation: Ensures proper pressure and heat dissipation contact; avoids electrostatic damage; supports remote parameter configuration (e.g., drive threshold).

　　Compatibility: Integrates with ABB ACS800 frequency converters, ACS6000 medium-voltage frequency converters, etc.; suitable for three-phase wiring; internal fuses for self-clearing of faults.

　　Voltage and Current: Rated voltage range from 480V to 72.5kV (e.g., GBU72: rated voltage 72.5kV, current 3150A, insulation level 170kV).

　　Protection Features: Integrated arc-extinguishing technology, undervoltage protection (automatically disconnects circuit when voltage drops below threshold), overload capacity of 1.8 times rated current.

　　Structure and Materials: Uses metallized polypropylene film, self-healing design, metal enclosure, dry insulation, and meets environmental requirements (e.g., oil-free/gas-free design).

　　Application Scenarios and Functions

　　Core Application Areas

　　Power Electronics Systems: As a core component of inverters/converters, used in wind power and photovoltaic renewable energy systems, ensuring stable operation of IGCT/IGBT modules. Industrial Drives: Integrated into ABB ACS6000 medium-voltage frequency converters, controlling high-power motors (e.g., in metallurgy and mining equipment).

　　Rail Transportation: Used in subway traction converters for smooth acceleration/braking and reduced energy consumption.

　　Power Grid Optimization: Used in substations as a reactive power compensation device to improve power factor (target ≥0.9), reduce line losses, and enhance voltage quality.

　　Specific Functions

　　Reactive Power Compensation: Improves system power factor and reduces apparent power demand through a capacitor bank.

　　Harmonic Filtering: Suppresses 5th and higher-order harmonics with a 7% reactance series reactor, preventing harmonic amplification.

　　Voltage Stabilization: Protects electrical equipment during grid fluctuations or faults by rapidly switching on/off.

　　Installation and Maintenance Requirements

　　Installation Guidelines

　　Mechanical Requirements: Ensure proper clamping pressure and heat dissipation for the IGCT module; the capacitor bank must be directly connected to the discharge device, avoiding intermediate switches/fuses.

　　Electrical Connections: Correctly connect the 24V DC power supply and fiber optic interface to prevent electrostatic damage; discharge residual charge from the capacitor bank using a discharge resistor or coil.

　　Environmental Conditions: Operating temperature range -25°C to +55°C, altitude ≤4000m, IP20/IP54 protection rating (depending on model).

　　Maintenance and Protection

　　Regular Inspection: Check for bulging or leakage in the capacitor casing; test insulation resistance (≥100MΩ@500V DC).

　　Troubleshooting: Fuse protection (fuse current 1.5-2.5 times rated current); after overvoltage/overcurrent protection triggers, investigate the cause and replace components as needed.

　　Safety Precautions: Do not close the circuit while energized; wait at least 3 minutes after power off before touching the capacitor bank.

　　Environmental Requirements: Installation location must be free from severe vibration, harmful gases, and conductive dust; temperature range -25°C to +40°C; special considerations required for altitudes above 1000m.

　　Electrical Connections: Correctly connect the 24VDC power supply and fiber optic interface; use flexible wires to avoid mechanical stress.

　　Periodic Checks: Monitor capacitance deviation (-5% to +10%), insulation resistance, cooling status, and protection function effectiveness; avoid overvoltage or overcurrent operation (steady-state overcurrent ≤1.43In).

　　Industry Standards and Compatibility

　　Standard Compliance

　　Compliant with GB50227-95 (Design Specification for Reactive Power Compensation Devices), IEC 60747-5-5 (Semiconductor Device Standard), and UL certification (safety certification).

　　Environmental Protection: Uses Class H insulation material, non-toxic gas mixture, and reduces CO2 emissions (50% less than traditional equipment).

　　Compatibility Design

　　Communicates with ABB main controller (e.g., AC 800PEC) via fiber optics, supporting remote parameter configuration (e.g., drive threshold, protection parameters).

　　Works with filter reactors and power factor controllers (e.g., RVT-L) for automatic switching and dynamic compensation. This device is a core component of ABB's high-voltage power electronics system, featuring high reliability, multiple protection mechanisms, and broad compatibility, making it suitable for industrial and energy applications requiring efficient power conversion and robust protection.

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