Table 62. Positive-sequence overvoltage protection (PSPTOV)
Characteristic
Value
Operation accuracy
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 1.1 × set
Start value
U
Fault
= 2.0 × set
Start value
Typically 29 ms (±15 ms)
Typically 24 ms (±15 ms)
Reset time
<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)
Includes the delay of the signal output contact
Table 63. Positive-sequence overvoltage protection (PSPTOV) main settings
Parameter
Function
Value (Range)
Step
Start value
PSPTOV
0.800...1.600 pu
0.001
Operate delay time
PSPTOV
0.040...120.000 s
0.001
Table 64. Positive-sequence undervoltage protection (PSPTUV)
Characteristic
Value
Operation accuracy
At the frequency f = f
n
±1.5% of the set value or ±0.002 × U
n
Start time
1)2)
U
Fault
= 0.9 × set
Start value
Typically 28 ms (±15 ms)
Reset time
<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 = 1.1 × U
n
, f
n
= 50 Hz, positive-sequence undervoltage of nominal frequency injected from random phase angle
2)
Includes the delay of the signal output contact
Table 65. Positive-sequence undervoltage protection (PSPTUV) main settings
Parameter
Function
Value (Range)
Step
Start value
PSPTUV
0.010...1.200 pu
0.001
Operate delay time
PSPTUV
0.040...120.000 s
0.001
Voltage block value
PSPTUV
0.01...1.0 pu
0.01
Generator Protection and Control
1MRS757583 C
REG630
Product version: 1.3
38
ABB
Summary of Contents for Relion 630 Series
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