Table 40. Two step residual overvoltage protection ROV2PTOV
Function
Range or value
Accuracy
Operate voltage, step 1
(1-200)% of
UBase
± 0.5% of U
r
at U < U
r
± 0.5% of U at U > U
r
Operate voltage, step 2
(1–100)% of
UBase
± 0.5% of U
r
at U < U
r
± 0.5% of U at U > U
r
Reset ratio
> 98%
-
Inverse time characteristics for low and high step, see table
-
Definite time setting, step 1
(0.00–6000.00) s
± 0.5% ± 25 ms
Definite time setting, step 2
(0.000–60.000) s
± 0.5% ± 25 ms
Minimum operate time for step 1 inverse characteristic
(0.000-60.000) s
± 0.5% ± 25 ms
Operate time, start function
30 ms typically at 0 to 2 x U
set
-
Reset time, start function
40 ms typically at 2 to 0 x U
set
-
Critical impulse time
10 ms typically at 0 to 1.2 xU
set
-
Impulse margin time
15 ms typically
-
Table 41. Overexcitation protection OEXPVPH
Function
Range or value
Accuracy
Operate value, start
(100–180)% of (
UBase/f
rated
)
± 0.5% of U
Operate value, alarm
(50–120)% of start level
± 0.5% of U
r
at U ≤ U
r
± 0.5% of U at U > U
r
Operate value, high level
(100–200)% of (
UBase/f
rated
)
± 0.5% of U
Curve type
IEEE
2
(0.18 )
:
(
1)
k
IEEE t
M
×
=
-
EQUATION1319 V1 EN
(Equation 2)
where M = (E/f)/(Ur/fr)
± 5% + 40 ms
Minimum time delay for inverse
function
(0.000–60.000) s
± 0.5% ± 25 ms
Alarm time delay
(0.00–9000.00)
± 0.5% ± 25 ms
Transformer protection RET650
1MRK 504 137-BEN B
Product version: 1.3
ABB
47
