Technical Data; Overexcitation Protection Oexpvph; Identification; Functionality - ABB RET650 Technical Manual

1MRK 504 135-UEN A
9.3.8
9.4
9.4.1
9.4.2
Technical manual

Technical data

Table 147: ROV2PTOV technical data
Function Range or value
Operate voltage, (1-200)% of
step 1
Operate voltage, (1–100)% of
step 2
Reset ratio > 98%
Inverse time -
characteristics for
low and high step,
see table 564
Definite time setting, (0.00–6000.00) s
step 1
Definite time setting, (0.000–60.000) s
step 2
Minimum operate (0.000-60.000) s
time for step 1
inverse characteristic
Operate time, start 30 ms typically at 0 to 2 x U
function
Reset time, start 40 ms typically at 2 to 0 x U
function
Critical impulse time 10 ms typically at 0 to 1.2 xU
Impulse margin time 15 ms typically

Overexcitation protection OEXPVPH

Identification

Function description
Overexcitation protection

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
UBase
UBase
set
set
set
IEC 61850 IEC 60617
identification identification
OEXPVPH
Section 9
Voltage protection
Accuracy
± 0.5% of U at U < U
r r
± 0.5% of U at U > U
r
± 0.5% of U at U < U
r r
± 0.5% of U at U > U
r
-
See table 564
± 0.5% ± 25 ms
± 0.5% ± 25 ms
± 0.5% ± 25 ms
-
-
-
-
ANSI/IEEE C37.2
device number
24
U/f >
SYMBOL-Q V1 EN
221