Manual 37137B
ESDR 4 - Current Differential Protection Relay
© Woodward
Page 23/35
Monitoring
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monitoring
ON
Monitoring ON/OFF
ON
................ Monitoring of the differential current is active and the follow-
ingscreens of this option are displayed.
OFF
.............. The monitoring is de-activated and the following screens are not dis-
played.
release limit
Is/In X=000%
Trigger Value I
S
/I
N
(X12)
50 to 300 %
Definition of the threshold characteristic for the monitoring of levels 1 and 2.
This value determines the horizontal position (X12-coordinates of points
P [X12/Y1] and P [X2/Y2]) of the corner points of the Warning and Tripping char-
acteristics.
release limit
Id/In Y=000%
Limit valueI
d
<I
N
(Monitoring level 2, Y2)
5 to 40 %
This value determines the vertical position (Y2-coordinate) of the corner point
P [X12/Y2] of the tripping characteristic (monitoring level2).
pick-up t. Id>IN
release 0,00s
Relay enable delay time for I
d
>I
N
(monitoring level 2)
0.04 to 3.00 s
If the differential current surpasses the generator rated current without interruption
over this time period, a fault condition for exceeding the threshold limit will be ini-
tiated.
pick-up t. Id<IN
release 0,00s
Relay enable delay time for I
d
<I
N
(monitoring level 2)
0.04 to 3.00 s
If the differential current surpasses the adjusted trigger threshold without interrup-
tion over this tme period, a fault condition for exceeding the threshold limit will be
initiated.
release time
release 0,00s
Relay disable delay time (monitoring level 2)
0.10 to 3.00 s
Only visible when the screen "Automatic reset of the relay" is configured to
ON .
If the differential current value which initiated the fault condition should fall 2% or
more below the trigger threshold limit and remain uninterrupted for the period of
time configured here, the fault condition will be terminated and the relay output
and the fault text will be reset.
automatic reset
error text ON
Automatic reset of error text
ON/OFF
Only visible when the screen "Automatic reset of the relay" is configured to
ON
ON
................ The displayed fault text will be automatically deleted, when the fault
conditions are no longer detected.
OFF
.............. The displayed fault text must be deleted manually, and can only be
done when fault conditions are no longer detected.
