Alstom MiCOM P545 - 1.3.17 Independent rate of change of frequency protection

Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-45
ST
Setting range
Menu text Default setting
Min. Max.
Step size
F< Function Link 0000
Bit 0
F<1 U/V Block
Bit 1
F<2 U/V Block
Bit 2
F<3 U/V Block
Bit 3
F<4 U/V Block
Settings that de
P.DEAD/POLEDEA
term whether undervoltage leve tting C AIL &
D V gnal bl e underfr y eleme
ines
OLTAGE/V< ) si
l (se
equenc
B F
nts. ock th
OVERFREQUENCY
F>1 Status Enabled Enabled or Disabled N/A
Setting to enable or disable the first stage overfrequency element.
F>1 Setting 50.5 Hz 45 Hz 65 Hz 0.01 Hz
Setting that determines the pick-up threshold for the first stage overfrequency element.
F>1 Time Delay 2 s 0 s 100 s 0.01 s
Setting that determines the
element.
minimum operating time-delay for the first stage overfrequency
F>2 Status
(s s stage1 ame a
above)
Disabled Enabled or Disabled N/A
1.3.17 Independ
T ides four ependent stages te of cha freque tection
( sitive or
n , with an
i being in e threshold
ent rate of change of frequency protection
he relay prov ind of ra nge of ncy pro
df/dt+t). Depending upon whether the rate of change of frequency setting is set po
egative, the element will react to rising or falling frequency conditions respectively
ncorrect setting dicated if th is set to zero.
Setting range
Menu text Default setting
in. ax.
p size
M M
Ste
DF/DT PROTECTION
GROUP 1
df/dt Avg. Cycles 6 6 12 6
This setting is available for calculating the rate of change of frequency measurement over
a fixed period of either 6 or 12 cycles.
df/dt>1 Status Enabled Enabled or Disabled N/A
Setting to enable or disable the first stage df/dt element.
df/dt>1 Setting 2.000 Hz/s 100.0 mHz/s 10 Hz/s 100 mHz/s
Pick-up setting for the first stage df/dt element.
df/dt>1 Dir'n. Negative Negative/Positive/Both N/A
This setting determines whether the element will react to rising or falling frequency
conditions respectively, with an incorrect setting being indicated if the threshold is set to
zero.
df/dt>1 Time 500.0 ms 0 100 10 ms
Minimum operating time-delay setting for the first stage df/dt element.