SEMOD175136-2 v9
Table 47. Out-of-step protection OOSPPAM
Function Range or value Accuracy
Impedance reach (0.00 - 1000.00)% of Zbase ±2.0% of U
r
/(√3 ⋅ I
r
)
Rotor start angle (90.0 - 130.0) degrees ±5.0 degrees
Rotor trip angle (15.0 - 90.0) degrees ±5.0 degrees
Zone 1 and Zone 2 trip counters (1 - 20) -
SEMOD175144-2 v10
Table 48. Loss of excitation LEXPDIS
Function Range or value Accuracy
X offset of Mho top point for zone 1
and zone 2
(–100.0–100.0)% of Z
Base
±2.0% of U
r
/(√3 ⋅ I
r
)
Diameter of Mho circle for zone 1 and
zone 2
(30.0–300.0)% of Z
Base
±2.0% of U
r
/(√3 ⋅ I
r
)
Independent time delay for zone 1
when impedance jumps from the
outside the set circle to the center of
the set circle
(0.00-60.00) s ±0.2% or ±60 ms whichever is greater
Independent time delay for zone 2
when impedance jumps from the
outside the set circle to the center of
the set circle
(0.00-60.00) s ±0.2% or ±60 ms whichever is greater
Operate time, start when impedance
jumps from the outside the set circle
to the center of the set circle
Min. = 35 ms
Max. = 50 ms
-
GUID-3740D5F1-3245-40EC-89B7-81297A3125D1 v3
Table 49. ROTIPHIZ technical data
Function Range or value Accuracy
Fault resistance sensitivity Can be reached at steady state
operating condition of the
machine
500 kΩ
Typically 50 kΩ
Injection frequency (75.000 - 250.000) Hz ±0.1 Hz
Trip limit of fault resistance (100 - 100000)Ω 5% of 1 kΩ at R
f
≤ 1 kΩ
5% of set value at 1 kΩ < R
f
≤ 20 kΩ
10% of set value at R
f
> 20 kΩ
Alarm limit of fault resistance (100 - 500000)Ω 5% of 1 kΩ at R
f
≤ 1 kΩ
5% of 10 kΩ at 1 kΩ < R
f
≤ 20 kΩ
10% of set value at 20 kΩ < R
f
≤ 200 kΩ
Operate time, start at R
f
~ 0 Ω and filter
length = 1 s
1.00 s typically -
Operate time, trip at R
f
~ 0 Ω and filter
length = 1 s
3.00 s typically -
Alarm time delay at R
f
~ 0 Ω and filter
length = 1 s
(0.00 - 600.00) s ±0.2% or ±2.00 s whichever is greater
Generator protection REG670
1MRK 502 074-BEN M
Hitachi Power Grids 75
© Copyright 2017 Hitachi Power Grids. All rights reserved
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