ABB RET670 Product Manual page 66

Transformer protection RET670
Customized
Product version: 1.2
Table 58. Two step residual overvoltage protection ROV2PTOV
Function
Operate voltage, step 1 and step 2
Absolute hysteresis
Inverse time characteristics for low
and high step, see table 114
Definite time setting, step 1
Definite time setting
Minimum operate time
Operate time, start function
Reset time, start function
Critical impulse time
Impulse margin time
Table 59. Overexcitation protection OEXPVPH
Function
Operate value, start
Operate value, alarm
Operate value, high level
Curve type
Minimum time delay for inverse
function
Maximum time delay for inverse
function
Alarm time delay
Table 60. Voltage differential protection VDCPTOV
Function
Voltage difference for alarm and
trip
Under voltage level
Timers
66
Range or value
(1-200)% of UBase
(0–100)% of UBase
-
(0.00–6000.00) s
(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
UBase /f
(100–180)% of ( )
rated
(50–120)% of start level
(100–200)% of ( UBase /f )
rated
IEEE or customer defined
×
(0.18 ) k
=
IEEE t :
- 2
( M 1)
(Equation 3)
EQUATION1319 V1 EN
where M = (E/f)/(Ur/fr)
(0.000–60.000) s
(0.00–9000.00) s
(0.00–9000.00)
Range or value
UBase
(0.0–100.0) % of
UBase
(0.0–100.0) % of
(0.000–60.000)s
1MRK 504 117-BEN D
Accuracy
± 0.5% of U at U < U
r
± 1.0% of U at U > U
± 0.5% of U at U < U
r
± 1.0% of U at U > U
See table 114
± 0.5% ± 10 ms
± 0.5% ± 10 ms
± 0.5% ± 10 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
± 5% + 40 ms
± 0.5% ± 10 ms
± 0.5% ± 10 ms
± 0.5% ± 10 ms
Accuracy
± 0.5 % of U
r
± 0.5% of U
r
± 0.5% ± 10 ms
r
r
r
r
r
r
ABB