Basler BE1-CDS220, Instruction Manual

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BE1-CDS220 Protection and Control 4-27
Figure 4-23. Overcurrent Screen, 51 Tab
Table 4-13. Operating Settings for Time Overcurrent
Range
Setting
5 A 1 A
Increment
Unit of
Measure
Default
Pickup
0 = Disabled
0.5 to 16
0 = Disabled
0.1 to 3.2
0.01 for 0.01 to 9.99
0.1 for 10.0 to 16.0
Sec. Amps 0
Time Dial 0.0 to 9.9 0.1 N/A 0
Curve See Appendix A N/A N/A V2
Example 1. Make the following settings to the Phase 51P time overcurrent element in BESTCOMS.
Refer to Figure 4-23.
Pickup: 10 secondary amps
Time Dial: 3.0
Curve: S1R
Retrieving Time Overcurrent Status from the Relay
The status of each logic variable can be determined through the ASCII command interface using the RG-
STAT (report general-status) command. See Section 6, Reporting and Alarm Functions, General Status
Reporting, for more information.
Programmable Curves
Time current characteristics for trip and reset programmable curves are defined by Equation 4-7 and
Equation 4-8 respectively. These equations comply with IEEE standard C37.112-1996. The curve specific
coefficients are defined for the standard curves as listed in Appendix A, Time Overcurrent Characteristic
Curves. When time current characteristic curve P is selected, the coefficients used in the equation are
those defined by the user. Definitions for these equations are provided in Table 4-16.
Equation 4-7. Time OC Characteristics for Trip
K BD
C M
AD
T
N
T
+ +
−
=
Equation 4-8. Time OC Characteristics for Reset
1
2
−
=
M
RD
T
R