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Parallel compensation, Generator protection functions, Overvoltage (59) and undervoltage (27) – Basler Electric DECS-250N User Manual

Page 328: Loss of sensing

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9440500990 Rev D

Specifications

DECS-250N

Steady-State Stability ....................... ±0.25% at rated PF with constant generator frequency and ambient

temperature

Temperature Drift ............................. ±0.5% between 0 and 40

°C at constant load and generator

frequency

Var Operating Mode

Setpoint Range ................................ –100% (leading) to +100% (lagging) of the generator nominal

apparent power in increments of 0.1%

Regulation Accuracy ........................ ±2.0% of the nominal generator apparent power rating at the rated

generator frequency

Power Factor Operating Mode

Setpoint Range ................................ 0.5 to 1.0 (lagging) and –0.5 to -1.0 (leading), in increments of 0.005
Regulation Accuracy ........................ ±0.02 PF of the PF setpoint for the real power between 10 and 100%

at the rated frequency

Parallel Compensation

Modes ............................................... Reactive Droop, Line Drop, and Reactive Differential (Cross-Current)
Cross-Current Input Burden ............. Can exceed 1 VA if external resistors are added to the CT circuit for

cross-current compensation

Cross-Current Input Terminals ......... CCCT+, CCCT–

Setpoint Range

Reactive Droop ................................ 0 to +30% of Rated Voltage
Line Drop .......................................... 0 to 30% of Rated Voltage
Cross-Current ................................... –30 to +30% of Primary CT Current

Generator Protection Functions

Overvoltage (59) and Undervoltage (27)

Pickup
Range ............................................... 1 to 600,000 Vac
Increment ......................................... 1 Vac

Time Delay
Range ............................................... 0.1 to 60 s
Increment ......................................... 0.1 s

Loss of Sensing

Time Delay
Range ............................................... 0 to 30 s
Increment ......................................... 0.1 s

Voltage Balanced Level
Range ............................................... 0 to 100% of Positive Sequence Voltage
Increment ......................................... 0.1%

Voltage Unbalanced Level
Range ............................................... 0 to 100% of Positive Sequence Voltage
Increment ......................................... 0.1%

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