DECS-100 Digital Excitation Control System DECS 100 AVR DECS100

Description

The DECS-100 is a microprocessor-based regulation system designed to control the output of a brushless excited synchronous generator. The DECS-100 is perfect for paralleling applications where generator to generator and/or generator to utility paralleling occurs with VAR/PF control and Over- and Underexcitation Limiting. The DECS-100 offers high functionality, communications, and performance at an extremely affordable price. The DECS-100 is very rugged and offers an extremely robust mechanical design that is cURus recognized, CE compliant, and DNV certified.

Features

• Microprocessor based
• 0.25% Voltage Regulation Accuracy
• 0.5% accuracy up to 40% THD (harmonics associated with 6 SCR load)
• 63Vdc @ 7Adc PWM output
• 0-3X V/Hz limiting
• Soft Start capability
• 20 standard stability selections and one customizable selection
• VAR/PF control
• Overexcitation limiting
• Underexcitation limiting
• Voltage Matching
• Manual Mode (Field current regulation)
• Paralleling input from 1 or 5A CT secondaries
• Nominal sensing inputs of 120, 240, 480 and 600Vac
• Power Input from 50/60Hz shunt connections or PMGs operating at 50 to 400Hz
• Five generator protection functions including Loss of Sensing transfer to manual
• Alarm Contact Output
• Accessory input
• LED Annunciation of operating conditions
• Setup via PC using BESTCOMS software (included)
• cURus recognition per UL 508 and CSA Standard C22.2 No. 14
• DNV Standard for Certification 2.4
• CE compliant

Specification

INPUTS
Power Input*

Voltage:                                        88-250Vac
Phase:                                          Single- or three-phase
Burden:                                         650VA
Frequency:                                    50 to 400Hz
Minimum Build-up Voltage:             6.0Vac
* NOTE: For Station Power application, refer to Accessories (page 8) regarding ICRM-7.

Sensing Input

Nominal Voltage Input:                   100/120, 200/240, 400/480, 600Vac, Single- or three-phase
Burden:                                         <1VA
Current Input:                                1 or 5 Amp (two models)
Burden:                                         <1 VA
Frequency:                                    50/60Hz

Accessory Input

±1Vdc creates a ±10% adjustment (respectively) for AVR, FCR and VAR set point.

±1Vdc creates a ±0.1PF adjustment (respectively) in the PF mode set point.
(adjusts only the active regulation mode)

OUTPUTS
DC Output
Continuous voltage:                        63Vdc
Continuous current:                         7.0Adc
10 second Forcing Voltage:             135Vdc (with nominal input applied)
10 second Forcing Current:             15.0Adc
Minimum Field Resistance:             9 Ohms

Alarm Contact Output
Dry Contact Rated:                        120/240Vac - make 30A for 0.2S, carry 7A continuously,
                                                     break 0.1A inductive

REGULATION ACCURACY
Regulation accuracy: ±0.25% no load to full load
Temperature drift: ±0.5% for a 40°C change in one hour
Response time: <1 cycle to the limit of the A/D converter
THD: ±0.25% for 20% THD and ±0.5% for 40% THD
(distortion as seen with a 6 SCR load)