ABB 3BHE027825R0150 I/O Signal Interface Board

Product Description

ABB 3BHE027825R0150 is a dedicated I/O signal interface board for UNITROL excitation system. It is a matching board for synchronous generator AVR automatic voltage regulator. It collects PT voltage, CT current, excitation current, unit status digital signals, performs signal isolation, conditioning and analog-to-digital conversion, and realizes signal interaction between main control unit and primary field equipment. Designed with electrical isolation, surge protection and anti-interference circuit, suitable for power plant heavy EMI environment. It is critical spare part for signal acquisition and I/O expansion of UNITROL excitation control system, widely used for new power station supply, existing excitation system retrofit and spare parts replacement.

Technical Parameters

1. Order Code: 3BHE027825R0150
2. Product Type: Excitation System Signal I/O Interface Board
3. Power Supply: 24VDC
4. Analog Channels: Multi-channel voltage/current acquisition, support PT secondary voltage, CT current and excitation current sampling
5. Digital Channels: Multi DI/DO, passive dry contact input and relay output
6. Signal Isolation: Galvanic isolation, common-mode noise suppression, surge protection
7. Operating Temperature: -40℃ ~ +70℃
8. Storage Temperature: -40℃ ~ +85℃
9. Protection Class: IP20 (PCB board, installed inside control cabinet)
10. Communication: On-board internal bus for data exchange with UNITROL main CPU board
11. Certifications: CE, UL, comply with grid excitation equipment standards

Application Scope

• Supporting UNITROL excitation system for synchronous generators: steam turbine, hydro turbine and gas turbine generator sets
• Signal acquisition for excitation control cabinet of industrial self-owned power plants and diesel gensets
• Upgrade retrofit of old excitation systems, replacement of legacy I/O board spare parts
• Signal monitoring and protection logic acquisition for grid-connected generator AVR voltage regulation system
• Marine power station and large industrial synchronous motor excitation control system

UNITROL Excitation I/O Board Series Models

1. 3BHE027825R0100: Basic I/O interface board with fewer channels
2. 3BHE027825R0120: Standard signal acquisition board, standard for conventional power plants
3. 3BHE027825R0150: Enhanced version with mixed multi analog & digital channels (this model)
4. 3BHE027825R0180: High-density I/O expansion board for large capacity generating units
5. 3BHE027825R0200: Dual-channel redundant I/O board for critical power station redundant excitation systems