ABB 1MRK002826-AG - Page 76

GUID-956187E5-A466-47BF-B671-F46548A5DF2E v4
Table 50. STTIPHIZ technical data
Function Range or value Accuracy
Fault resistance sensitivity Can be reached at steady state
operating condition of the
machine
50 kΩ
Typically 10 kΩ
Injection frequency (50.000 - 250.000) Hz ±0.1 Hz
Injection voltage 240 V
Trip limit of fault resistance (100 - 10000)Ω ±5% of 1 kΩ at R
f
≤ 1 kΩ
±10% of set value at R
f
> 1 kΩ
Alarm limit of fault resistance (100 - 100000)Ω ±5% of 1 kΩ at R
f
≤ 1 kΩ
±10% of 10 kΩ at 1 kΩ < R
f
≤ 10 kΩ
±50% of set value at R
f
> 10 kΩ
Operate time, start at R
f
~ 0Ω and filter
length = 1 s
1.00 s typically -
Operate time, trip at R
f
~ 0Ω and filter
length = 1 s
3.00 s typically -
Alarm time delay at R
f
~ 0Ω and filter length
= 1 s
(0.00 - 600.00) s ±0.2% or ± 2.00 s whichever is greater
GUID-E8104D00-3183-4F55-89F9-A74B14BFE6FE v7
Table 51. Underimpedance protection for generators and transformers ZGVPDIS
Function Range or value Accuracy
Number of zones 3 -
Forward reach
(3.0 - 200.0)% of Z
r
where Z
r
=UBase/√3∗IBase
±5.0% of set impedance
Conditions:
Voltage range: (0.1 - 1.1) x U
r
Current range: (0.5 - 30) x I
r
Reverse reach
(3.0 - 200.0)% of Z
r
where Z
r
=UBase/√3∗IBase
±5.0% of set impedance
Conditions:
Voltage range: (0.1 - 1.1) x U
r
Current range: (0.5 - 30) x I
r
Impedance angle (5 - 90) degrees -
Reset ratio 105% typically -
Start time at 1.2 x set impedance to 0.8 x
set impedance
Min. = 15 ms
-
Max. = 35 ms
Independent time delay to operate at 1.2 x
set impedance to 0.8 x set impedance
(0.000 – 60.000) s ±0.2% or ±40 ms whichever is greater
Generator protection REG670
1MRK 502 074-BEN M
Version 2.2
76 Hitachi Power Grids
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