UNITROL® 5000 Software Functionality

UNITROL® 5000 Software Functionality
The well-structured software of the standard program already offers most of the regulation, protection and monitoring functions required for the secure operation of the excitation system and comprehensive event and data logging for diagnostics and service

Functionality of the standard program

This comprises the following excitation specific functions: Regulator functions • Voltage regulator with PID filter (AUTO operating mode) •Field current regulator with PI filter (MAN operating mode) • Reactive load and/or active load droop/compensation •Limiters for:– maximum and minimum field current– maximum stator current (lead / lag)– P/Q underexcitation– Volts-per-Hertz characteristic • Follow-up control– CHANNEL 1 ↔ CHANNEL 2 (for dual automatic channel systems)– active CHANNEL ↔ BACKUP (for systems with backup regulator)– operating mode AUTO ↔ MAN • Power factor / reactive load regulation • MANUAL restrict • Power system stabilizer (option)– conventional in accordance with IEEE – PSS2A– Adaptive power system stabilizer– Multiband power system stabilizer.

Protection and monitoring functions

•Field flashing time • Overcurrent protection (instantaneous / inverse time) • Volts-per-Hertz protection • Loss of excitation protection • Power converter temperature • Rotor temperature • Rotating diodes monitoring • Thyristor conduction monitoring • Power converter fuses monitoring • Power converter fans monitoring • Measuring circuit supervision.Monitoring and protection functions are classified in three different action levels: • Fault display only • Switch-over to the second channel or to the backup regulator (if provided) or use of the available power con verter redundancy •Instantaneous excitation trip for pro tection purposes
Control functions All standard excitation sequences and interlocks are software-based with fixed pre-programmed function blocks. They can be extended with freely pro grammable function blocks by the user.

Data recording

The UNITROL 5000 software has an event recorder (fault logger), that can record up to 100 events and alarms with real-time stamp. The logs are read and analyzed with the control panel or the CMT software. Up to six measurement signals can be recorded in real-time with the data recorder (data logger). These can be displayed graphically in the CMT soft ware trend window for diagnostic pur poses

Monitoring of the processor

Self check After the power supply is switched on, the processor starts a self-check. The processor also monitors the various power supply voltages. Program execution monitoring The processor card has an internal watchdog function, which monitors the correct execution of the program.