ABB RET670 Product Manual page 65

ABB
Transformer protection RET670
Pre-configured
Product version: 1.1
Table 44. Two step overvoltage protection OV2PTOV
Function
Operate voltage, low and
high step
Absolute hysteresis
Inverse time characteristics
for low and high step, see
table 93
Definite time delays
Minimum operate time,
Inverse characteristics
Operate time, start function
Reset time, start function
Critical impulse time
Impulse margin time
Table 45. Two step residual overvoltage protection ROV2PTOV
Function
Operate voltage, low and
high step
Absolute hysteresis
Inverse time characteristics
for low and high step, see
table 94
Definite time setting
Minimum operate time
Operate time, start function
Reset time, start function
Critical impulse time
Impulse margin time
Range or value
(1-200)% of Ubase
(0–100)% of U
base
-
(0.000-60.000) s
(0.000-60.000) s
25 ms typically at 0 to 2 x U
25 ms typically at 2 to 0 x U
10 ms typically at 0 to 2 x U
15 ms typically
Range or value
(1-200)% of Ubase
(0–100)% of Ubase
-
(0.000–60.000) s
(0.000-60.000) s
25 ms typically at 0 to 2 x U
25 ms typically at 2 to 0 x U
10 ms typically at 0 to 2 x U
15 ms typically
1MRK 504 091-BEN B
Issued: June 2010
Accuracy
± 1.0% of U at U < U
r
± 1.0% of U at U > U
± 1.0% of U at U < U
r
± 1.0% of U at U > U
See table 93
± 0.5% ± 10 ms
± 0.5% ± 10 ms
-
set
-
set
-
set
-
Accuracy
± 1.0% of U at U < U
r
± 1.0% of U at U > U
± 1.0% of U at U < U
r
± 1.0% of U at U > U
See table 94
± 0.5% ± 10 ms
± 0.5% ± 10 ms
-
set
-
set
-
set
-
r
r
r
r
r
r
r
r
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