Hitachi Relion 670 Series Product Manual page 114

Line differential protection RED670
Version 2.2
Table 77. Residual overvoltage protection, two steps ROV2PTOV
Function
Operate voltage, step 1 - step 2
Absolute hysteresis
Inverse time characteristics for low and
high step, see table
Definite time delay low step (step 1) at 0
to 1.2 x U
set
Definite time delay high step (step 2) at 0
to 1.2 x U
set
Minimum operate time
Operate time, start at 0 to 2 x U
Reset time, start at 2 x U to 0
set
Operate time, start at 0 to 1.2 x U
Reset time, start at 1.2 x U
set
Critical impulse time
Impulse margin time
Table 78. Overexcitation protection OEXPVPH
Function
Operate value, start
Operate value, alarm
Operate value, high level
Curve type
Minimum time delay for inverse
function
Maximum time delay for inverse
function
Alarm time delay
114
Range or value
(1.0-200.0)% of UBase
(0.0–50.0)% of UBase
-
(0.00–6000.00) s
(0.000–60.000) s
(0.000-60.000) s
Min. = 15 ms
set
Max. = 30 ms
Min. = 15 ms
Max. = 30 ms
Min. = 20 ms
set
Max. = 35 ms
to 0 Min. = 5 ms
Max. = 25 ms
10 ms typically at 0 to 2 x U
15 ms typically
Range or value
(100–180)% of (UBase/f
(50–120)% of start level
(100–200)% of (UBase/f
IEEE or customer defined
×
(0.18 ) k
=
IEEE t :
- 2
( M 1)
EQUATION1319 V1 EN-US
where M = (E/f)/(Ur/fr)
(0.000–60.000) s
(0.00–9000.00) s
(0.00–9000.00)
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M13317-2 v16
Accuracy
± 0.5% of U
r
± 0.5% of U at U > U
± 0.5% of U
r
± 0.5% of U at U > U
See table 229
± 0.2% or ± 45 ms whichever is greater
± 0.2% or ± 45 ms whichever is greater
± 0.2% or ± 45 ms whichever is greater
-
-
-
-
-
set
-
M13338-2 v12
Accuracy
) ±0.5% of U
rated
±0.5% of U at U ≤ U
r
±0.5% of U at U > U
) ±0.5% of U
rated
±5.0 % or ±45 ms, whichever is greater
(Equation 2)
±1.0% or ±45 ms, whichever is greater
±1.0% or ±45 ms, whichever is greater
±1.0% or ±45 ms, whichever is greater
1MRK 505 379-BEN R
at U ≤ U
r
r
at U ≤ U
r
r
r
r
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