undercurrent feature when machine is disconnected from the network it shall be supervised by
appropriate signal (e.g. blocked when generator CB is open). Simplified logic diagram of this
.
ANSI12000021-2-en.vsdx
AND
OR
37 PICKUP
MeasurCurrent
37 Enable
IBase
37 trip delay
t
x
ANSI12000021 V2 EN-US
Figure 320: Undercurrent protection feature
Tripping logic
This tripping logic provides some additional features regarding blocking and tripping options
available within the function. The list below describes functionality of every binary input and
output from the function which influence the trip logic.
Available binary inputs:
BLOCK prevents operation of overload and undercurrent features, at the same time all binary
outputs are forced to zero.
BLOCK37 prevents operation of undercurrent feature only
SETLKOUT forces lockout operation (output LOCKOUT) by external signal
RESET resets lockout and forces Theta value to zero
Available binary outputs:
TRIP, operation of the overload feature
37 TRIP, operation of the undercurrent feature
PICKUP, current bigger than
IPickup level
37 PICKUP, current smaller than
37 PICKUP level
LOCKOUT, sealed-in TRIP output signal from the function. Note that lockout feature is only
enabled by setting
AutoLockout = “On”
79M BLOCK, output signal active as long as Theta >
ReclsLevTheta, which can be used to block
closing of the generator CB
Section 8
1MRK 502 066-UUS B
Current protection
596
Technical manual
Содержание Relion 670 series
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