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additional lower alarm level. By activating inputs, the HZPDIF (87) function can either be
blocked completely, or only the trip output.
AlarmPickup
AlarmPickup
0-tAlarm
0
0.03s
0
en05000301_ansi.vsd
ANSI05000301 V1 EN
Figure 48:
Logic diagram for 1Ph High impedance differential protection HZPDIF
(87)
6.3.8
Technical data
Table 43:
HZPDIF (87)technical data
Function
Range or value
Accuracy
Operate voltage
(20-400) V
I=V/R
± 1.0% of I
n
Reset ratio
>95%
-
Maximum continuous
power
V>Pickup
2
/SeriesResistor ≤200 W
-
Operate time
10 ms typically at 0 to 10 x V
d
-
Reset time
100 ms typically at 10 to 0 x V
d
-
Critical impulse time
2 ms typically at 0 to 10 x V
d
-
6.4
Generator differential protection GENPDIF (87G)
1MRK 502 048-UUS A
Section 6
Differential protection
131
Technical manual
Summary of Contents for 650 series
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