ABB ret650, Technical Manual

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9.3.8 Technical data
Table 147: ROV2PTOV technical data
Function Range or value Accuracy
Operate voltage,
step 1
(1-200)% of
UBase
± 0.5% of U
r
at U < U
r
± 0.5% of U at U > U
r
Operate voltage,
step 2
(1–100)% of
UBase
± 0.5% of U
r
at U < U
r
± 0.5% of U at U > U
r
Reset ratio > 98% -
Inverse time
characteristics for
low and high step,
see table 564
- See table 564
Definite time setting,
step 1
(0.00–6000.00) s ± 0.5% ± 25 ms
Definite time setting,
step 2
(0.000–60.000) s ± 0.5% ± 25 ms
Minimum operate
time for step 1
inverse characteristic
(0.000-60.000) s ± 0.5% ± 25 ms
Operate time, start
function
30 ms typically at 0 to 2 x U
set
-
Reset time, start
function
40 ms typically at 2 to 0 x U
set
-
Critical impulse time 10 ms typically at 0 to 1.2 xU
set
-
Impulse margin time 15 ms typically -
9.4 Overexcitation protection OEXPVPH
9.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Overexcitation protection OEXPVPH
U/f >
SYMBOL-Q V1 EN
24
9.4.2 Functionality
When the laminated core of a power transformer or generator is subjected to a
magnetic flux density beyond its design limits, stray flux will flow into non-laminated
components that are not designed to carry flux. This will cause eddy currents to flow.
These eddy currents can cause excessive heating and severe damage to insulation and
1MRK 504 135-UEN A
Section 9
Voltage protection
221
Technical manual