CAT C32 - 3.5. Caterpillar Digital Voltage Regulator (CDVR)

Technical CATERPILLAR – 1000 kVA Page 10
Description UTILITY POWER MODULE
Revision 1.0 1 May 2006
3.5. Caterpillar
®
Digital Voltage Regulator
®
(CDVR
®
)
3.5.1. CDVR
®
Description
The Caterpillar
®
Digital Voltage Regulator (CDVR) is a microprocessor-based control
designed to provide precise voltage control, robust transient response, and generator
protection with industry leading features and versatility.
3.5.2. CDVR
®
Features
 Microprocessor based control featuring choice of three control modes standard:
o Automatic Voltage Regulation (AVR)
o Power Factor Regulation (PF)
o Reactive Power Regulation (Var)
 Programmable stability settings.
 Soft start control with an adjustable time setting in AVR control mode.
 Dual Slope Underfrequency (volts/hertz) regulation
 Three-phase or single-phase generator voltage (RMS) sensing/regulation in AVR
mode
 Single-phase generator current sensing for regulation purposes
 Field current and field voltage sensing
 Five contact sensing inputs for system interface
 One common LED for visual indication of Alarm and Shutdown fault conditions
 Fault Shutdown Driver and Alarm Output Driver for indication of Alarm and Shutdown
fault conditions
 Generator paralleling with reactive droop compensation and reactive differential
compensation
 Line drop compensation
 UL 508A Recognized and CE certified
 Ten generator protective functions.
o Generator Overvoltage
o Generator Undervoltage
o Loss of Excitation
o Instantaneous Field Overcurrent
o Over Excitation
o Loss of Sensing
o Diode Fault Monitor
o Internal Watchdog Failure
o Internal Memory Failure
o Fault Reset Closed Too Long