ABB RET670 Product Manual page 66

Transformer protection RET670
Pre-configured
Product version: 1.1
Table 46. 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 47. Voltage differential protection (PTOV)
Function
Voltage difference for
alarm and trip
Under voltage level
Timers
66
Range or value
(100–180)% of (Ubase/f
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 2)
EQUATION1319 V1 EN
where M = relative (V/Hz) = (E/
f)/(Ur/fr)
(0.000–60.000) s
(0.00–9000.00) s
(0.000–60.000) s
Range or value
(0.0–100.0) % of U
base
(0.0–100.0) % of U
base
(0.000–60.000)s
1MRK 504 091-BEN B
Issued: June 2010
Accuracy
) ± 1.0% of U
± 1.0% of U at U ≤ U
r
± 1.0% of U at U > U
) ± 1.0% of U
Class 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
ABB