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Transformer protection RET650
Product version: 1.1
Table 35. Two step residual overvoltage protection ROV2PTOV
Function
Operate voltage, step 1
Operate voltage, step 2
Reset ratio
Inverse time characteristics
for low and high step, see
table
66
Definite time setting, step 1
Definite time setting, step 2
Minimum operate time for
step 1 inverse characteristic
Operate time, start function
Reset time, start function
Critical impulse time
Impulse margin time
Table 36. Overexcitation protection OEXPVPH
Function
Operate value, start
Operate value, alarm
Operate value, high level
Curve type
Minimum time delay for
inverse function
Alarm time delay
58
Range or value
(1-200)% of UBase
(1–100)% of UBase
>95%
-
(0.00–6000.00) s
(0.000–60.000) s
(0.000-60.000) s
30 ms typically at 0 to 2 x U
40 ms typically at 2 to 0 x U
10 ms typically at 0 to 2 x U
15 ms typically
Range or value
(100–180)% of (UBase/f
rated
(50–120)% of start level
(100–200)% of (UBase/f
rated
IEEE
×
(0.18 )
k
=
IEEE t
:
-
2
(
M
1)
(Equation 2)
EQUATION1319 V1 EN
where M = (E/f)/(Ur/fr)
(0.000–60.000) s
(0.000–60.000) s
1MRK 504 127-BEN -
Issued: February 2011
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
66
± 0.5% ± 25 ms
± 0.5% ± 25 ms
± 0.5% ± 25 ms
-
set
-
set
-
set
-
Accuracy
)
± 0.5% of U
± 0.5% of U
at U ≤ U
r
± 0.5% of U at U > U
)
± 0.5% of U
Class 5 + 40 ms
± 0.5% ± 25 ms
± 0.5% ± 25 ms
at U < U
r
r
at U < U
r
r
r
r
ABB
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