ABB RELION 670 Series Product Manual page 88

Transformer protection RET670 2.1 IEC
Table 65. 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 162
Definite time delay low step (step 1) at 0 to 1.2 x U
Definite time delay high step (step 2) at 0 to 1.2 x U
Minimum operate time
Operate time, start at 0 to 2 x U
Reset time, start at 2 to 0 x U
Operate time, start at 0 to 1.2 x U
Reset time, start at 1.2 to 0 x U
Critical impulse time
Impulse margin time
Table 66. 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
88
set
set
set
set
set
set
Range or value
UBase /f
(100–180)% of (
(50–120)% of start level
(100–200)% of ( UBase /f
IEEE or customer defined
×
(0.18 ) k
=
IEEE t :
-
2
( M 1)
EQUATION1319 V1 EN-US
where M = (E/f)/(Ur/fr)
(0.000–60.000) s
(0.00–9000.00) s
(0.00–9000.00)
M13317-2 v12
Range or value
UBase
(1.0-200.0)% of
UBase
(0.0–50.0)% of
-
(0.00–6000.00) s
(0.000–60.000) s
(0.000-60.000) s
Min. = 15 ms
Max. = 30 ms
Min. = 15 ms
Max. = 30 ms
Min. = 20 ms
Max. = 35 ms
Min. = 5 ms
Max. = 25 ms
10 ms typically at 0 to 2 x U
15 ms typically
M13338-2 v11
Accuracy
) ±0.5% of U
rated
±0.5% of U at U ≤ U
r
±0.5% of U at U > U
) ±0.5% of U
rated
±5.0 % or ±45 ms, whichever is greater
(Equation 3)
±1.0% or ±45 ms, whichever is greater
±1.0% or ±45 ms, whichever is greater
±1.0% or ±45 ms, whichever is greater
1MRK 504 155-BEN F
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 162
± 0.2% or ± 45 ms whichever is
greater
± 0.2% or ± 45 ms whichever is
greater
± 0.2% or ± 45 ms whichever is
greater
-
-
-
-
-
set
-
r
r
at U ≤ U
r
r
at U ≤ U
r
r
ABB