ABB 3BHE02195R0124 excitation control unit



ABB 3BHE02195R0124 excitation control unit

Product Overview

ABB 3BHE02195R0124, as a professional excitation control unit, occupies a core position in industrial power generation and large-scale motor operation systems. It is mainly responsible for precise control and dynamic adjustment of the excitation system of synchronous generators, large industrial motors and other equipment. By stabilizing the excitation current, it ensures the stability of equipment output voltage, frequency and other parameters, and is a key equipment to ensure the reliable operation of power production and industrial power systems.

Functional Features

High precision excitation regulation: adopting advanced PID control algorithm and adaptive regulation technology, it can monitor the operating parameters of the generator or motor in real time (such as terminal voltage, reactive power, etc.), and quickly adjust the excitation current,

Even in the case of severe load fluctuations, it can respond quickly, maintain the stability of equipment output, and effectively avoid equipment failures or production interruptions caused by voltage fluctuations.

Comprehensive protection function: It integrates multiple protection mechanisms, including overexcitation protection, underexcitation protection, overvoltage protection, overcurrent protection, etc. When an abnormality is detected in the excitation system (such as excessive excitation current or voltage exceeding the safe range), the protection action can be immediately triggered to cut off the excitation circuit or issue an alarm signal, preventing equipment damage due to the expansion of the fault and ensuring system safety.

Flexible operating mode: supports switching between multiple operating modes, such as constant voltage mode, constant reactive power mode, constant excitation current mode, etc. Users can choose the appropriate mode based on their actual operational needs, such as grid scheduling requirements and load characteristics, to enhance the flexibility and adaptability of system operation. For example, when operating in a large power grid, a constant reactive power mode can be used to compensate for reactive power in conjunction with the grid; When running independently, switch to constant voltage mode to ensure stable output voltage.

Powerful data acquisition and communication capabilities: Equipped with high-speed data acquisition modules, it can collect various operational data of the excitation system in real time (such as excitation voltage, current, power factor, etc.), and communicate with the upper computer or SCADA system through communication interfaces such as RS485 and Ethernet to achieve remote monitoring, data storage, and analysis. Facilitating real-time monitoring of system status by operators for remote debugging and fault diagnosis.

Working principle

After 3BHE02195R0124 is connected to the excitation system, the terminal voltage and stator current signals of the generator or motor are first collected through voltage transformers and current transformers. After being processed by internal signal conditioning circuits (filtering, amplification, isolation), they are transmitted to the core control chip. The control chip compares the actual measured value with the set value based on the preset operating mode (such as constant voltage), calculates the deviation, and generates excitation regulation instructions through PID algorithm.

After the instruction is converted from digital to analog, it drives a power amplifier circuit (such as a thyristor rectifier bridge) to adjust the DC current output to the excitation winding. At the same time, the system monitors real-time feedback signals such as excitation current and excitation voltage to form a closed-loop control and continuously optimize the adjustment accuracy. When abnormal signals (such as overexcitation) are detected, the protection circuit immediately activates, cutting off power output and triggering an alarm to ensure equipment safety.

Installation and maintenance

Installation requirements: It should be installed in a control cabinet with good ventilation, no severe vibration, and away from strong magnetic fields (such as large transformers), with an ambient temperature of -10 ℃ -+50 ℃ and a relative humidity of ≤ 90% (no condensation). Special guide rails or screws should be used for installation to ensure that the wiring terminals are firmly connected to external cables (such as excitation cables and control cables), and grounding treatment should be done (grounding resistance ≤ 4 Ω) to reduce electromagnetic interference.

Maintenance points: Regularly (recommended every 6 months) check whether the wiring terminals are loose and whether the cable insulation layer is damaged; Clean the dust on the surface of the equipment and the heat dissipation holes to ensure good heat dissipation; View historical operating data and alarm records through the upper computer, and analyze system stability. If there is an abnormal excitation regulation (such as voltage fluctuation exceeding the standard), the sensor and output module can be recalibrated through the calibration function; If the protection action is triggered, external equipment such as the excitation winding and power unit need to be checked, and the fault should be eliminated before resetting the operation.

Application scenarios

Thermal power plant: In a thermal power unit, it is used to control the excitation system of a steam turbine generator. When the load of the power grid changes, quickly adjust the excitation current to maintain the stability of the generator terminal voltage, and adjust the reactive power output according to the requirements of the power grid dispatch to improve the stability of the power grid. For example, when the unit is connected to the grid for operation, it can cooperate with the power grid to achieve automatic allocation of reactive power and reduce line losses.

Hydroelectric power station: Suitable for excitation control of hydro generators to cope with load fluctuations caused by unstable water flow. By dynamically adjusting the excitation, the generator ensures stable operation under different water head and flow conditions, while participating in frequency and voltage regulation of the power grid, improving the grid connection performance of the hydropower system.

Large industrial motors: used for excitation control of large synchronous motors (such as rolling mill motors, compressor motors) in industries such as steel and chemical. By stabilizing excitation, the power factor of the motor is improved, energy consumption is reduced, and the smoothness of the motor during starting and braking is ensured, thereby extending the service life of the equipment.

New energy support: As the excitation control core of generators in new energy power plants such as biomass energy and garbage power generation, it ensures the stable grid connection between the new energy power generation system and the power grid, and meets the strict requirements of the power grid for voltage and frequency.