Description
‑ Power Supply: Powered by excitation rack back‑plane bus, 24 VDC auxiliary power
‑ Power Consumption: approx 8.5 W
‑ Mechanical Structure: Eurocard plug‑in board for UNITROL rack, metal front panel, back‑plane bus connector, multi‑channel analog signal terminal block
‑ On‑board Resources: PSS algorithm processing unit, analog signal conditioning circuit, filter logic unit, back‑plane bus controller, module self‑diagnosis circuit, conformal‑coating protection layer, optimized signal‑filter circuit for R2 revision
‑ Communication Interface: Internal dedicated back‑plane bus for excitation main‑control board
‑ Galvanic Isolation: Galvanic isolation for external PSS sampling signal channels, isolation rating 2500 VAC
‑ Input Signal Types: generator active‑power signal, rotating‑speed deviation signal for PSS calculation
‑ Core Function Hardware: PSS‑2A/PSS‑4 power‑system stabilizer algorithm operation, supplementary‑regulation signal output
‑ Protection: input surge‑suppression, signal over‑range monitoring
‑ Status LED Indicators: Power indicator, Module Fault indicator, signal input status LED, PSS operating status LED
‑ Weight: approx 0.93 kg
‑ Collects generator active‑power and speed‑deviation analog signals, completes filtering and conditioning, executes PSS power‑system stabilizer algorithm calculation, generates supplementary control signal and transmits to excitation main‑control board.
‑ Suppresses inter‑area low‑frequency oscillation of grid after generator disturbance, improves damping characteristic of generator‑grid tie‑in system, guarantees safe and stable parallel‑operation of generator on power grid.
‑ Supports multiple sets of PSS parameter‑group configuration, can switch parameters adaptively according to generator operating condition. R2 version optimizes filtering circuit, reduces interference‑caused false‑output risk.
‑ Module self‑diagnosis monitors signal‑sampling channel, algorithm processing circuit, rack power‑supply and back‑plane bus communication; detects signal loss, hardware circuit abnormality, uploads module‑level fault‑alarm information to main‑control board. Conformal‑coating improves long‑term reliability under harsh power‑plant site condition.
‑ Cannot run independently; must be installed inside UNITROL excitation rack and cooperate with excitation main‑control board. HENF450295R2 is hardware revision variant of G3EFa series; pin‑compatible within G3EFa revision family, cannot directly interchange with other series excitation boards.
‑ Continuously monitors PSS input‑signal channel status, module power‑supply and internal hardware health. Detected faults activate fault LED and send fault word to excitation main controller.
‑ No local numerical display; PSS operating parameters and fault codes are read via excitation commissioning tool or upper‑level HMI workstation.
‑ Module hardware failure will cause PSS function deactivation; generator AVR voltage‑regulation still runs normally, but power‑grid low‑frequency oscillation damping capability is lost, brings hidden risk for grid parallel‑operation.
‑ Back‑plane connector: connects to excitation rack internal bus, receives sampling data, transmits PSS supplementary‑control instruction and diagnostic status to main‑control board.
‑ Analog signal terminal block: wiring terminals for generator power and speed‑deviation sampling shielded cables.
‑ Mounting: Plug‑in installation inside UNITROL excitation cabinet rack
‑ Operating Temperature: ‑20 °C ~ +60 °C
‑ Storage Temperature：−40 °C ~ +70 °C
‑ Relative Humidity: 5‑95 %RH, non‑condensing
‑ Protection Class: IP20 (cabinet internal)
- G3EFa PSS power‑system stabilizer board (HENF450295R2)
Complementary parts: UNITROL excitation rack and back‑plane, excitation main‑control board, power/speed measuring device, shielded analog signal cables, excitation commissioning software.
‑ Power off the whole excitation rack before inserting or removing this board. PSS sampling signal wiring must adopt shielded cable with single‑end shield grounding; strictly distinguish PSS signal loop and PT/CT sampling loop wiring, avoid wrong wiring causing board burnout.
‑ For spare‑part replacement: Verify complete part number HENF450295R2. After replacement, confirm back‑plane bus identification, download matching PSS parameter set, verify signal acquisition, PSS algorithm operation and fault‑reporting function. Hardware revision mismatch will lead to PSS output distortion.
‑ Module hardware fault will result in power‑system stabilizer function failure.
Thermal‑power and hydro‑power generator excitation cabinets; ABB UNITROL6000 generator excitation system; industrial spare‑part replacement for generator PSS power‑system‑stabilizer computing unit.
- UNITROL6000 excitation system dedicated G3EFa PSS board, completes power‑system stabilizer algorithm calculation, outputs supplementary control signal to restrain grid low‑frequency oscillation, hardware variant HENF450295R2.
- Conformal‑coating processing, adapts to power‑plant high‑humidity and corrosive harsh site environment. R2 revision optimizes signal‑filter circuit for stronger anti‑interference performance.
- PSS sampling channels adopt opto‑coupler galvanic isolation, resists strong electromagnetic interference of power‑plant cabinet.
- Channel‑level self‑diagnosis function, convenient for field PSS signal‑loop fault location.
- Standard Eurocard rack‑mount plug‑in structure, convenient installation and on‑site maintenance.
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