ABB RET670 Product Manual page 57

ABB
Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Voltage protection
Table 33. Two step undervoltage protection UV2PTUV (27)
Function
Operate voltage, low and high step
Absolute hysteresis
Internal blocking level, low and high step
Inverse time characteristics for low and
high step, see table 82
Definite time delays
Minimum operate time, inverse
characteristics
Operate time, pickup function
Reset time, pickup function
Critical impulse time
Impulse margin time
Table 34. Two step overvoltage protection OV2PTOV (59)
Function
Operate voltage, low and high step
Absolute hysteresis
Inverse time characteristics for low and
high step, see table 81
Definite time delays
Minimum operate time, Inverse
characteristics
Operate time, pickup function
Reset time, pickup function
Critical impulse time
Impulse margin time
Range or value
(1–100)% of VBase
(0–100)% of VBase
(1–100)% of VBase
-
(0.000-60.000) s
(0.000–60.000) s
25 ms typically at 2 to 0 x V
set
25 ms typically at 0 to 2 x V
set
10 ms typically at 1.2 to 0.8 x V
15 ms typically
Range or value
VBase
(1-200)% of
VBase
(0–100)% of
-
(0.000-60.000) s
(0.000-60.000) s
25 ms typically at 0 to 2 x V
set
25 ms typically at 2 to 0 x V
set
10 ms typically at 0 to 2 x V
set
15 ms typically
1MRK 504 118-BUS A
Accuracy
± 0.5% of V
n
± 0.5% of V
n
± 0.5% of V
n
See table 82
± 0.5% ±10 ms
± 0.5% ± 10 ms
-
-
-
set
-
Accuracy
± 0.5% of V at V < V
n
± 0.5% of V at V > V
± 0.5% of V at V < V
n
± 0.5% of V at V > V
See table 81
± 0.5% ± 10 ms
± 0.5% ± 10 ms
-
-
-
-
n
n
n
n
57