BASLER DECS-200-2L Digital Excitation Control System

BASLER DECS-200-2L Digital Excitation Control System DECS2002L

One DECS-200 Digital Excitation Control System can accommodate 32Vdc, 63Vdc, or

125Vdc applications up to 15Adc. This unique flexibility provides precision control of

generators of virtually any size. The DECS-200 also incorporates a pulse width modulated

power stage, which improves system performances in non-linear load applications.

• True RMS sensing, single or three phase

• 32Vdc, 63Vdc, and 125Vdc outputs at 15Adc

• 0.25% Voltage Regulation Accuracy

• Setup from front panel HMI or by PC with Windows® setup software included

• 20 standard stability selections

• User customizable stability selection

• Paralleling compensation

• Underfrequency compensation or V/Hz Ratio Limiter

• Soft start buildup

• Field Current Regulation Mode (Manual Mode)

• Autotracking between operating modes and between DECS-200 units

(optional)

• Minimum Excitation Limiter (Internally generated or customizable)

• On and off-line Maximum Excitation Limiters

• Stator Current Limiter

• Var and Power Factor Controllers

• Exciter Diode Monitoring (EDM)

• Sequence of Events Recording

• Oscillography

Generator Current Sensing Two ac current sensing ranges and two channel (phase) inputs:

• For metering and control: 1A and 5A.

• For cross current compensation: 1A and 5A.

Sensing Burden Voltage: Less than 1VA per phase.

Current: Less than 1VA.

Parallel Compensation: Less than 1VA.

Contact Switching Inputs 11 contact switching inputs are supplied with 24Vdc to accommodate dry

contacts. Contacts are as follows:

• Start • Var/PF Enable

• Stop • Pre-position

• Secondary DECS Enabled (optional) • Raise Switch

• Unit/Parallel Operation • Lower Switch

• AVR Mode • Alarm Rest

• FCR Mode

Remote Set Point Control Two separate analog inputs for remote set point control. Typically used to accept

(Accessory Input) a signal from a Power System Stabilizer. Select one from the configuration menu.

• ±10Vdc

• 4 to 20 milliamperes

DECS-200-1C

DECS-200-1L

REGULATION ACCURACY

AVR Mode: Voltage regulation equals ±0.25% over the load range at rated power factor and constant

generator frequency. Steady state stability equals ±0.1% at a constant load and generator frequency.

Temperature drift equals ±0.5% for 0 to 50°C temperature change. Underfrequency (volts/hertz)

characteristic slope from 0 to 3.0 P.U. is adjustable in 0.1 P.U. increments.

FCR Mode: Field current regulation equals ±1.0% of the nominal value for 10% of the bridge input voltage

change or 20% of the field resistance change.

var Mode: ±2.0% of the nominal VA rating at the rated frequency.

PF Mode: ±0.02 PF in the set point PF for the real power between 10 and 100% at the rated frequency.

(e.g. -set point PF=0.80, PF regulation is from 0.78 to 0.82 PF.)

Internal autotracking(optional): ±0.5% of the nominal field voltage change when transferring.

PARALLEL COMPENSATION Can use either reactive droop or reactive differential (cross-current) compensation.

Adjustable from 0 to 30% of the rated generator voltage droop with optional 1 ampere or less or 5 amperes

or less input. Line drop compensation uses this same parameter; however, it is adjustable from -30% to 0.

FIELD OVERVOLTAGE PROTECTION Adjustable in increments of 1.0Vdc from 1.0 to 325Vdc rated output

voltage with a 0.2 to a 0.2 to 30 second inverse time delay settable in increments of 0.1 second.

FIELD OVERCURRENT PROTECTION Adjustable in increments of 0.1Adc steps of rated field current from 0 to

16Adc excitation current setting with an inverse time delay (ANSI C50.13).

EXCITER DIODE MONITOR (EDM) The DECS-200's EDM can detect open and shorted diodes on brushless

generators. To do this, the DECS-200 requires the user to input the number of generator poles and the number of

exciter poles (both adjustable from 0 to 20 in increments of 2). The open and shorted diode ripple threshold is

adjustable from 0 to 100% of field current. The open diode protection time delay is adjustable from 10 to 60

seconds, and the shorted diode protection time delay is adjustable from 5 to 30 seconds.

GENERATOR UNDERVOLTAGE PROTECTION Adjustable in increments of 1Vac from 0 to 30kV sensing voltage