GE D30 Instruction Manual page 435

CHAPTER 5: SETTINGS
FlexCurves
FlexCurves are described in the FlexCurves section later in this chapter. The curve shapes for the FlexCurves are derived
from the formulae:
where
T = operate time (in seconds)
TDM = Multiplier setting
I = Input Current
I = Pickup Current setting
pickup
T = Reset Time in seconds (assuming energy capacity is 100% and
RESET
Definite time curve
The Definite Time curve shape operates as soon as the pickup level is exceeded for a specified period of time. The base
definite time curve delay is in seconds. The curve multiplier of 0.00 to 600.00 makes this delay adjustable from
instantaneous to 600.00 seconds in steps of 10 ms. The definite time curve shapes are defined as follows:
where
T = Operate Time (in seconds)
TDM = Multiplier setting
I = Input Current
I = Pickup Current setting
pickup
T = Reset Time in seconds (assuming energy capacity is 100% and RESET: Timed)
RESET
Recloser curves
The D30 uses the FlexCurve feature to facilitate programming of 41 recloser curves. See the FlexCurves settings section
earlier in this chapter for details.
5.7.7.3 Phase time overcurrent (ANSI 51P, IEC PTOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  PHASE CURRENT  PHASE TOC1(2)
 PHASE TOC 1

D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PHASE TOC1

FUNCTION: Disabled
PHASE TOC1 SIGNAL

SOURCE: SRC 1
PHASE TOC1

INPUT: Phasor
PHASE TOC1

PICKUP: 1.000 pu
PHASE TOC1

CURVE: IEEE Mod Inv
: Timed)
RESET
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: Phasor, RMS
Range: 0.020 to 30.000 pu in steps of 0.001
Range: see Overcurrent Curve Types table
GROUPED ELEMENTS
Eq. 5-11
Eq. 5-12
Eq. 5-13
5
Eq. 5-14
5-225