ABB RET670 Product Manual page 58

Transformer protection RET670 ANSI
Pre-configured
Product version: 1.2
Table 35. Two step residual overvoltage protection ROV2PTOV (59N)
Function
Operate voltage, low and high step
Absolute hysteresis
Inverse time characteristics for low and
high step, see table 83
Definite time setting
Minimum operate time
Operate time, pickup function
Reset time, pickup function
Critical impulse time
Impulse margin time
Table 36. Overexcitation protection OEXPVPH (24)
Function
Pickup value, pickup
Pickup value, alarm
Pickup value, high level
Curve type
Minimum time delay for inverse
function
Maximum time delay for inverse
function
Alarm time delay
58
Range or value
VBase
(1-200)% of
(0–100)% of VBase
-
(0.000–60.000) s
(0.000-60.000) s
25 ms typically at 0 to 2 x V
25 ms typically at 2 to 0 x V
10 ms typically at 0 to 2 x V
15 ms typically
Range or value
VBase /f
(100–180)% of ( )
n
(50–120)% of pickup level
(100–200)% of ( VBase /f )
n
IEEE or customer defined
×
(0.18 TD )
=
IEEE t :
-
2
( M 1)
(Equation 2)
EQUATION1645 V1 EN
where M = (E/f)/(Vn/fn)
(0.000–60.000) s
(0.00–9000.00) s
(0.000–60.000) s
1MRK 504 118-BUS A
Accuracy
± 0.5% of V at V < V
n
± 1.0% of V at V > V
± 0.5% of V at V < V
n
± 1.0% of V at V > V
See table 83
± 0.5% ± 10 ms
± 0.5% ± 10 ms
-
set
-
set
-
set
-
Accuracy
± 0.5% of V
± 0.5% of V at V ≤ V
n n
± 0.5% of V at V > V
n
± 0.5% of V
Class 5 + 40 ms
± 0.5% ± 10 ms
± 0.5% ± 10 ms
± 0.5% ± 10 ms
n
n
n
n
ABB