Extended Protective Relaying
39
7.9
Over Frequency
The trip unit can alarm or trip on the frequency of the monitored
power by setting the parameters from the
Over Frequency
selection of the
Protective Relays Menu
. To alarm, or to trip
and alarm, on over frequency:
1.
From the
Protective Relays Menu
, select
Over Fre-
quency
. The Alarm checkbox is highlighted, but alarming
has not yet been set.
2.
To enable alarming, press the Up
Arrow key, then press
Enter
. If you have enabled alarming, a checkmark
appears and the pickup settings are highlighted.
3.
Select a pickup value by pressing the Up
or Down
Arrow keys until the value is at the desired level. The possi-
ble pickup values are 1, 2, 3, 4, 5, 7, 9, 12 Hz above the
nominal frequency. Press Enter
.
4.
Then select a delay time by pressing the Up
or Down
Arrow keys until the value is at the desired level. Possible
time delay settings are 1, 2, 3, 4, 5, 7, 10 and 15 seconds.
Press Enter
.
7.10
Under Frequency
The trip unit can alarm or trip on the frequency of the monitored
power by setting the parameters from the
Under Frequency
selection of the
Protective Relays Menu
. To alarm, or to trip
and alarm, on under frequency:
1.
From the
Protective Relays Menu
, select
Under Fre-
quency
. The Alarm checkbox is highlighted, but alarming
has not yet been set.
2.
To enable alarming, press the Up
Arrow key, then press
Enter
. If you have enabled alarming, a checkmark
appears and the pickup settings are highlighted.
3.
Select a pickup value by pressing the Up
or Down
Arrow keys until the value is at the desired level. The pos-
sible pickup values are 1, 2, 3, 4, 5, 7, 9, 12 Hz below the
nominal frequency. Press Enter
.
4.
Then select a delay time by pressing the Up
or Down
Arrow keys until the value is at the desired level. Possi-
ble time delay settings are 1, 2, 3, 4, 5, 7, 10 and 15 sec-
onds. Press Enter
.
If you want to
enable...
Then...
alarming only
follow steps 2–4 and press Escape
. Then press Enter
at the verifi-
cation screen.
alarming and tripping
follow steps 2–4, press Enter
to
highlight the Trip checkbox, then
repeat the process you used in
steps 2–4 to set pickup and delay
values. After setting both the alarm
and trip values, press Escape
.
Then press Enter
at the verifica-
tion screen.
If you want to
enable...
Then...
alarming only
follow steps 2–4 and press Escape
. Then press Enter
at the verifi-
cation screen.
alarming and tripping
follow steps 2–4, press Enter
to
highlight the Trip checkbox, then
repeat the process you used in
steps 2–4 to set pickup and delay
values. After setting both the alarm
and trip values, press Escape
.
Then press Enter
at the verifica-
tion screen.
