Table 60. Overexcitation protection OEXPVPH
Function Range or value Accuracy
Operate value, start (100–180)% of (
UBase
/f
rated
) ± 0.5% of U
Operate value, alarm (50–120)% of start level ± 0.5% of U
r
at U ≤ U
r
± 0.5% of U at U > U
r
Operate value, high level (100–200)% of (
UBase
/f
rated
) ± 0.5% of U
Curve type IEEE or customer defined
EQUATION1319 V1 EN (Equation 3)
where M = (E/f)/(Ur/fr)
± 5.0 % or ± 45 ms, whichever is greater
Minimum time delay for inverse
function
(0.000–60.000) s ± 1.0% or ± 45 ms, whichever is greater
Maximum time delay for inverse
function
(0.00–9000.00) s ± 1.0% or ± 45 ms, whichever is greater
Alarm time delay (0.00–9000.00) ± 1.0% or ± 45 ms, whichever is greater
Table 61. Voltage differential protection VDCPTOV
Function
Range or value Accuracy
Voltage difference for alarm and
trip
(2.0–100.0) % of
UBase
±0.5% of U
r
Under voltage level (1.0–100.0) % of
UBase
±0.5% of U
r
Independent time delay for
voltage differential alarm at 0.8 to
1.2 x UDAlarm
(0.000–60.000)s ±0.2% or ±40 ms whichever is greater
Independent time delay for
voltage differential trip at 0.8 to 1.2
x UDTrip
(0.000–60.000)s ±0.2% or ±40 ms whichever is greater
Independent time delay for
voltage differential reset at 1.2 to
0.8 x UDTrip
(0.000–60.000)s ±0.2% or ±40 ms whichever is greater
Table 62. Loss of voltage check LOVPTUV
Function
Range or value Accuracy
Operate voltage (1–100)% of UBase ±0.5% of U
r
Pulse timer when disconnecting
all three phases
(0.050–60.000) s ±0.2% or ±15 ms whichever is greater
Time delay for enabling the
functions after restoration
(0.000–60.000) s ±0.2% or ±35 ms whichever is greater
Operate time delay when
disconnecting all three phases
(0.000–60.000) s ±0.2% or ±35 ms whichever is greater
Time delay to block when all three
phase voltages are not low
(0.000–60.000) s ±0.2% or ±35 ms whichever is greater
Transformer protection RET670 2.0
1MRK 504 141-BEN C
Product version: 2.0
74 ABB
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