Figure 4-22. Overcurrent Screen, 50T/150T Tab
The default unit of measure for the
Pickup
setting is secondary amps. Primary amps (Pri Amps), per unit
amps (Per U Amps), and percent amps (% Amps) can also be selected as the pickup setting unit of
measure. The unit of measure for the
Time
setting that represents the element's time delay, defaults to
milliseconds. It is also selectable for seconds, minutes, and cycles.
If time delay settings are made in cycles, they are converted to seconds or milliseconds (per the nominal
frequency setting stored in EEPROM) before being stored and rounded to the nearest whole millisecond.
See Section 3,
Input and Output Functions, Power System Inputs, Current Measurement
, for more
information about this setting. If the nominal frequency setting is being changed from the default (60
hertz) and time delay settings are being set in cycles, the frequency setting should be entered and saved
before making any time delay settings changes.
Beside the
Logic
pull-down menu is a pull-down menu labeled
Settings
. The Settings menu is used to
select the setting group that the element's settings apply to.
Table 4-11 summarizes the operating settings for Instantaneous Overcurrent.
Table 4-11. Operating Settings for Instantaneous Overcurrent
Range
Setting
5 A
1 A
Increment
Unit of
Measure
Default
Pickup
0 = Disabled
0.5 to 150
0 = Disabled
0.1 to 30
0.01 for 0.01 to 9.99
0.1 for 10.0 to 99.9
1.0 for 100 to 150
Secondary
amps
0
0 to 999 milliseconds
1 m
Milliseconds
0.1 to 60 seconds
0.1 for 0.1 to 9.9 sec
1.0 for 10 to 60 sec
Seconds
Time Delay
0 to 3600 (60 Hz) or 0 to 2500 (50 Hz)
Cycles
0
Time delays less than 10 cycles can be entered to the nearest 0.1 cycles from the optional HMI. All
time delays can be entered to the nearest 0.01 cycles from the ASCII command interface. Time delays
entered in cycles are converted to milliseconds or seconds. Increment precision after conversion is limited
to that appropriate for each of those units of measure.
4-26
BE1-CDS240 Protection and Control
9365200990 Rev F
Summary of Contents for BE1-CDS240
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