ABB

1.Function

High-precision Current Sampling & Signal Conversion Collect AC/DC current signals from generator CTs, convert raw current signals into standardized low-level analog signals for the excitation controller. Provide accurate current feedback for excitation closed-loop regulation.
Signal Conditioning & Isolation Filter, amplify and isolate sampled current signals to suppress electromagnetic interference in power plant environments, protect the main excitation control CPU from high voltage surges. www.plcva.com
Hardware Overcurrent Monitoring Built-in hardware threshold detection, trigger alarm or interlock signals when generator current exceeds preset safety limits, providing fast hardware-level protection independent of software logic.
Data Communication with Excitation Main Controller Transmit conditioned current measurement data to the UNITROL main control board via internal backplane bus, support real-time current value upload for excitation regulation calculation.
Board Self-diagnosis & Fault Reporting Continuously monitor board power supply, sampling circuit and signal channel health status. Report channel failure, signal loss or board fault to the excitation system alarm log. www.plcva.com
Modular Hot-replaceable Spare Design Standard rack-mounted plug-in PCB. It can be replaced during maintenance after power isolation to restore excitation current measurement function.

ABB 3BHE017574R0001 Physical photo

ABB 3BHE017574R0001 Physical photo

Installed inside ABB UNITROL series generator excitation cabinets, serving as the current sensing signal interface board for synchronous generators.
Core spare replacement component for power plant excitation systems. When the original current sensing board fails, replace it with 3BHE017574R0001 to recover generator current feedback and excitation regulation. www.plcva.com
Typical industries: Thermal power plants, hydropower plants, diesel power stations and industrial self-generation power plants.