Basler BE1-CDS220, Instruction Manual

Page: 90 / 476

4-24 Protection and Control BE1-CDS220
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.
Retrieving Instantaneous Overcurrent Status from the Relay
The status of each logic variable can be determined from the ASCII command interface using the RG-
STAT command. See Section 6, Reporting and Alarm Functions, General Status Reporting, for more
information.
51 - Time Overcurrent Protection
There are three independent functions for phase (51P, 151P, 251P), three for neutral (51N, 151N, 251N),
and three for negative-sequence (51Q, 151Q, 251Q) inverse time overcurrent protection. Each function
can be attached to either of the two hardware CT input circuits by the BESTlogic mode setting.
Figure 4-21 shows the 51P (phase time overcurrent) as a typical 51 function. Each of the nine
independent functions has two logic outputs #51nPU (picked up) and #51nT (trip) where n indicates
whether it is a P (phase), N (neutral), or Q (negative-sequence). The # differentiates between the
protective functions (51, 151, or 251).
D2843-03
07-24-00
BLK
51PT
Mode =
0-disable
1-ct ckt 1
2-ct ckt 2
SL-51P
LOGIC
51PPU
Figure 4-21. Time Overcurrent Logic Block
NOTE
When changing settings with the relay in service, an error message (PU TOO
LOW) will be generated if the new setting is within approximately 90% of the
metered current level. This is intended to prevent the user from inadvertently
causing a trip when changing a setting.