Specifications include, but are not limited to: 1) Digital excitation controller with field flashing and integral Power System Stabilizer (PSS) 2) Human Machine Interface (HMI) Locally on the Door 3) AC Disconnect 4) Rectifier Bridge 5) Field Ground Detection Relay with alarm and trip output contacts 6) Exciter control and protection system a) Excitation controller shall control the field current to regulate voltage, power factor, or VARs. Controller shall be set for voltage regulation during startup when the generator circuit breaker is open and shall be set for power factor or VAR regulation when the generator is running in parallel with the utility’s distribution system. b) Field flashing controls shall be provided utilizing a dedicated 125V dc power circuit from the station battery system. c) Exciter controller shall be furnished with standard factory software for calibration, testing, setup, and commissioning, along with communication cable required for connection to a laptop. d) The excitation controller shall be capable of forcing the field voltage either positive or negative during operation. e) Control power for the excitation controller shall be 125V dc. f) Excitation controller shall have capability to communicate to the existing control system. g) Excitation controller shall be furnished with a voltage matching feature to allow it to sense the bus voltage during unit startup and automatically adjust the generator voltage to match. h) The voltage regulator shall have an integral Power System Stabilizer (PSS). The PSS shall be an IEEE type PSSA in accordance with Standard 421.5. 7) The excitation system shall provide the following compensating and limiting functions: a) Maximum stator current limiter function. b) Maximum field current limiter function for inductive (overexcited) load region. c) Load angle limiter function or alternatively a stability limiter function for capacitive (underexcited) load region.
