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CHAPTER 6: SETPOINTS
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PH TOC PKP
Range: 0.05 to 20.00 x CT in steps of 0.01 x CT
Default: 1.00 x CT
This setting sets the time overcurrent pickup level. For example, a PKP setting of 0.9 x CT
with 300:5 CT translates into 270A primary current.
PH TOC CURVE
Range: ANSI Extremely/Very/Moderately/Normally Inverse, Definite Time, IEC Curve A/B/C
and Short Inverse, IAC Extremely/Very/Inverse/Short, FlexCurve A, FlexCurve B
Default: Extremely Inverse
This setting sets the shape of the selected TOC inverse curve. If none of the standard
curve shapes is appropriate, a custom User curve, or FlexCurve can be created. Refer to
the User curve and the FlexCurve setup for more detail on their configurations and
usage.
PH TOC TDM
Range: 0.05 to 50.00 in steps of 0.01
Default: 1.00
This setting provides selection for Time Dial Multiplier by which the times from the
inverse curve are modified. For example if an ANSI Extremely Inverse curve is selected
with TDM = 2, and the fault current was 5 times bigger than the PKP level, the operation
of the element will not occur before an elapsed time from pickup, of 495 ms.
PH TOC RESET
Range: Instantaneous, Linear
Default: Instantaneous
The "Instantaneous" reset method is intended for applications with other relays, such as
most static relays, which set the energy capacity directly to zero when the current falls
below the reset threshold. The "Timed" reset method can be used where the relay must
coordinate with electromechanical relays.
OUTPUT RELAY X
For details see
Common
BLOCK 1/2/3
For details see
Common
setpoints.
setpoints.
S3 PROTECTION
6–71
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