Table 84. Positive-sequence overvoltage protection (PSPTOV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 1.1 × set
Start value
29 ms
32 ms
34 ms
U
Fault
= 2 × set
Start value
32 ms
24 ms
26 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
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Positive-sequence voltage before fault = 0.0 × U
n
, f
n
= 50 Hz, positive-sequence overvoltage of nominal frequency injected from random phase angle
2)
Measured with static signal output (SSO)
Table 85. Positive-sequence overvoltage protection (PSPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
PSPTOV
0.400...1.600 × U
n
0.001
Operate delay time
PSPTOV
40...120000 ms
10
Table 86. Positive-sequence undervoltage protection (PSPTUV)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured voltage: f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
Minimum
Typical
Maximum
U
Fault
= 0.99 × set
Start value
U
Fault
= 0.9 × set
Start value
52 ms
44 ms
55 ms
47 ms
58 ms
50 ms
Reset time
Typically 40 ms
Reset ratio
Depends on the set
Relative hysteresis
Retardation time
<35 ms
Operate time accuracy in definite time mode
±1.0% of the set value or ±20 ms
Suppression of harmonics
DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1)
Start value = 1.0 × U
n
, positive-sequence voltage before fault = 1.1 × U
n
, f
n
= 50 Hz, positive sequence undervoltage with nominal frequency injected from random phase angle, results based
on statistical distribution of 1000 measurements
2)
Includes the delay of the signal output contact
Table 87. Positive-sequence undervoltage protection (PSPTUV) main settings
Parameter
Function
Value (Range)
Step
Start value
PSPTUV
0.010...1.200 × U
n
0.001
Operate delay time
PSPTUV
40...120000 ms
10
Voltage block value
PSPTUV
0.01...1.00 × U
n
0.01
1MRS759144 A
REX640
Product version: 1
56
ABB
Summary of Contents for RELION REX640
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