Table 13-49. Instantaneous Overcurrent 250T/350T/450T/550T/650T/750T Element Test Logic
Replace These Commands
With These Commands For x50T Element Tests
(where x = 3,4,5,6,7)
SL-50T=1,0 SL-x50T
=
1,0
SL-VO1=50TPT SL-VO1
=
x50TPT
SL-VO2=50TNT SL-VO2
=
x50TNT
SL-VO3=50TQT SL-VO3
=
x50TQT
SG-TARG=50T
SG-TARG = x50T
SG-TRIGGER=50TPT+50TNT+50TQT,
50TQPU,0
SG-TRIGGER = x50TQT,
x50TQTPU,0
Step 9:
(Optional.) Repeat Steps 1 through 8 for the each x50T element in Setting Groups 1, 2 and 3.
Use the following information as a guide to program the 50T/ 150T/ 250T/ 350T/ 450T/ 550T/
650T/ 750T elements in higher order setting groups.
In order to program the pickup of the elements in a higher order-setting group, you would
replace the
0
in the S
0
-50TP, S
0
-50TN, and S
0
-50TQ commands in Table 13-46 with a 1, 2,
or 3 for Setting Groups 1, 2, or 3. Using the HMI, you can program each set of values by
navigating to the appropriate setting group screen \PROT\SGn\50T\50T where n is equal to
the setting group you desire. Refer to the CS/CO-GROUP command in Section 4,
Protection
And Control Functions,
for more information on changing the active setting group.
To change from Setting Group 0 to Setting Group 1, execute the following commands:
CS-GROUP=1 select Setting Group 1
CO-GROUP=1 execute Setting Group 1
Using the basic information in Table 13-46, program the pickup of the elements for Setting
Group 1 and, optionally, proceed with Group 1 testing.
Sidebar 13-10. Negative-Sequence Overcurrent Element Pickup
A three-phase electric power system can be modeled using a set of balanced equations known as
symmetrical components. These components provide a practical method of analyzing power system
operation during unbalanced conditions such as would occur during a fault.
The symmetrical components of a power system are segregated into positive, negative, and zero-
sequence components. At any given time, all of these components may be present in load current due to
unbalanced load, etc. In practice however, asymmetrical current or voltage conditions are more typical
due to unbalanced loads, unbalanced system faults, open conductors, etc. In the case of an unbalanced
load, this condition may be detrimental to the operation of a power system and the equipment. Under
unbalanced fault conditions, these components will very likely be harmful to equipment and potentially to
personnel. Positive-sequence components are comprised of balanced three-phase currents and line-to-
neutral voltages supplied by power system generators. Under any of these scenarios, negative-sequence
and zero-sequence components will be present. The associated figure shows the sequence components
in phasor form.
positive
negative
zero
I
c1
I
b1
I
a1
I
c2
I
b2
I
a2
I
a0
= I
b0
= I
c0
Sequence Components In Phasor Form
9365200990 Rev F
BE1-CDS240 Testing and Maintenance
13-59
Summary of Contents for BE1-CDS240
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Page 349: ...Figure 12 5 Horizontal Rack Mount Front View 9365200990 Rev F BE1 CDS240 Installation 12 5 ...
Page 361: ...Figure 12 17 Typical DC Connection Diagrams 9365200990 Rev F BE1 CDS240 Installation 12 17 ...
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