ALSTOM FV200-M2 and LC110-M2 are the fault detection and limit monitoring modules used in the excitation control system of Gecostat/C10/120-M2. FV200-M2 undertakes the functions of quick detection and protection triggering of excitation faults, while LC110-M2 is responsible for continuous monitoring of excitation limits and implementation of adjustment boundaries. Together, they constitute the safety line of the excitation system under abnormal working conditions, and are suitable for thermal power, hydropower, and industrial self-owned power plant generator sets still running on the legacy platform.
FV200-M2: excitation fault detection and protection front end
FV200-M2 plays the role of "sentry" of the excitation system in the Gecostat architecture. According to the description of the spare parts channel, this module is installed in the generator excitation cabinet as the fault monitoring front end of the automatic voltage regulator (AVR), and directly collects the excitation current, PMG voltage, and stator current feedback signals. Its core function is to detect rotor over-excitation, loss of excitation, and asymmetry faults through multi-level threshold comparison and vector analysis, and trigger the protection relay to cut off the excitation circuit when judging abnormality to prevent rotor burning.
In terms of performance characteristics, the source mentioned that the module supports programmable threshold adjustment, the response time is in the millisecond level (different sources give < 50ms and < 3 ms respectively, which is different), it has Modbus communication ability to support SCADA integration, and it conforms to the IEC 60255 relay standard. These characteristics make it different from ordinary overcurrent relays and can provide faster protection response for transient anomalies of the excitation system.
LC110-M2: Monitoring and regulating boundary of excitation limit value
The positioning of LC110-M2 is relatively consistent among multiple sources: it is a limit module in the C10/120-M2 excitation control system, which is responsible for excitation fault detection and limit monitoring. In AVR architecture, this module monitors the generator voltage, current, power factor, and other parameters, and imposes upper and lower limits on the excitation signal to prevent over-excitation (leading to rotor overheating) or under-excitation (endangering synchronous stability). Its function is to enforce the stability boundary, not to act as a general PLC or signal converter.
Supporting relationship and system role
FV200-M2 and LC110-M2 have complementary functions in the Gecostat/C10/120-M2 system: FV200-M2 focuses on rapid detection and trip triggering when faults occur, while LC110-M2 focuses on limit constraints under normal operation and boundary conditions. Together, they ensure that the excitation system will not transmit the fault to the generator rotor or power grid when the AVR is abnormal.
Alstom MV7306P21
Alstom MV7306P22
Alstom MV7306P23
Alstom MV7306P24
ALSTOM L54E2900XK00
ALSTOMA AL129A
ALSTOM I/OBE2 P/N:12004-104-00 V1.0.0
