Hitachi Relion 670 Series Product Manual page 88

Line differential protection RED670
Version 2.2
Table 40. High speed line differential protection for 4 CT sets, 2-3 line ends L4CPDIF with 2 Mbit/s communication
Function
Minimum operate current
SlopeSection2
SlopeSection3
EndSection1
EndSection2
Unrestrained limit function
Second harmonic blocking
Fifth harmonic blocking
Critical impulse time
Operate time with two input groups'
currents, restrained function, in a 50
1)
Hz system
Operate time with two input groups'
currents, restrained function, in a 60
1)
Hz system
Operate time, restrained function at
0 to 10 x I , in a 50 Hz system
dMin
Operate time, restrained function at
0 to 10 x I , in a 60 Hz system
dMin
Reset time, restrained function at 10
2)
x I to 0
dMin
Operate time, unrestrained function
2)
at 0 to 10 x I
dUnre
Reset time, unrestrained function at
2)
10 x I to 0
dUnre
The data in the table are valid for single IED with 2 Mbit/s communication in loop-back mode.
The operate (trip) time is measured from general operate (trip) signal. In case of phase selective trip, the discrepancy between different phases
might be few milliseconds for a three-phase fault.
1) This data is obtained by applying two three-phase input groups' currents to simulate an internal fault with default settings. I
currents. The fault is performed by simultaneously increasing one group's currents to 10 x I
2) This data is obtained by applying one three-phase input group's currents only.
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Range or value
(20-200)% of IBase
(10.0-100.0)%
(30.0-100.0)%
(20–200)% of IBase
(100–1000)% of IBase
(100–10000)% of IBase
(5.0–100.0)% of fundamental
(5.0–100.0)% of fundamental
2 ms typically at 0 to 10 x
I
dMin
Min. = 10 ms
Max. = 20 ms
Min. = 8 ms
Max. = 17 ms
Min. = 10 ms
Max. = 20 ms
2)
Min. = 8 ms
Max. = 17 ms
2)
Min. = 45 ms
Max. = 65 ms
Min. = 5 ms
Max. = 17 ms
Min. = 45 ms
Max. = 65 ms
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Accuracy
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
-
-
-
-
±1.0% of I at I ≤ I
r r
±1.0% of I at I > I
r
±1.0% of I
r
Note: fundamental magnitude = 100% of I
±3.0% of I
r
Note: fundamental magnitude = 100% of I
-
-
-
-
-
-
-
-
r
and decreasing the other group's currents to 0.
dMin
1MRK 505 379-BEN R
r
r
is applied to both input groups as pre- and post-fault
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