Table 94. Overexcitation protection (OEPVPH)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
±3.0% of the set value
Start time
1)
Frequency change:
Typically 200 ms
Voltage change:
Typically 40 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<35 ms
Operate time accuracy in definite-time mode
±1.0% of the set value or ±20 ms
Operate time accuracy in inverse-time mode
±5.0% of the theoretical value or ±50 ms
1)
Includes the delay of the signal output contact
Table 95. Overexcitation protection (OEPVPH) main settings
Parameter
Function
Value (Range)
Step
Start value
OEPVPH
100...200%
1
Operating curve type
1)
OEPVPH
Definite or inverse time
Curve type: 5, 15, 17, 18, 19, 20
Time multiplier
OEPVPH
0.1...100.0
0.1
Operate delay time
OEPVPH
200...200000 ms
10
Cooling time
OEPVPH
5...10000 s
1
1)
For further reference, see the Operation characteristics table
Table 96. Three-phase thermal protection for feeders, cables and distribution transformers (T1PTTR)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
Current measurement: ±1.5% of the set value or ±0.002 × I
n
(at currents
in the range of 0.01...4.00 × I
n
)
Operate time accuracy
1)
±2.0% of the theoretical value or ±0.50 s
1)
Overload current > 1.2 × Operate level temperature
1MRS759144 A
REX640
Product version: 1
ABB
59
Summary of Contents for RELION REX640
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