Schweitzer Engineering Laboratories SEL-311C - Application Settings; Convert SEL-221 C Settings to SEL-311 C Settings; Table 14.24 SEL-311 C Settings Calculated from SEL-221 C Settings

14.40
SEL-311C Relay Instruction Manual Date Code 20060320
Application Settings for SEL-221 Series Relays
SEL-221C to SEL-311C Settings Conversion Guide
Application Settings
From Access Level 2, set the SEL-311C application setting to “221C” as
shown below:
=>>SET APP TERSE <Enter>
Line Parameter Settings:
Application
(311C,221G,221G5,221H,221F,221F3,221C,221-16,2PG10)APP = 311C ? 221C <Enter>
Enable Settings:
Fault Location(Y,N) EFLOC = Y ? END <Enter>
Save Changes(Y/N)? Y <Enter>
Settings saved
=>>
Convert SEL-221C
Primary Quantities to
SEL-311C Secondary
Quantities
All SEL-221C current settings must be converted from primary to secondary
amps to be used in the SEL-311C. Divide the SEL-221C current setting by the
current transformer ratio setting (CTR) to make the change.
SEL-221C impedance settings must be converted from percent of primary line
impedance to secondary impedance in ohms. For example, the Zone 1 distance
setting in the SEL-311C (Z1P) is calculated as
Equation 14.6
Convert SEL-221C
Settings to SEL-311C
Settings
Table 14.24 shows all the SEL-311C settings that must be entered for the relay
to perform protection similar to the SEL-221C when APP = 221C. Calculate
each SEL-311C setting from SEL-221C settings using the formula shown.
Instruction manual references are to subsection headings rather than to section
headings.
where:
Z1% = the SEL-221C distance reach setting
Z1MAG = the SEL-311C positive-sequence line impedance setting
in secondary ohms
Z1P = the SEL-311C Zone 1 reach setting in secondary ohms
Z1P
Z1%
100
------------
Z1MAG• =
Table 14.24 SEL-311C Settings Calculated From SEL-221C Settings (Sheet 1 of 4)
SEL-311C
Setting
a
Calculated From SEL-221C Settings
SEL-311C Instruction
Manual Section
SEL-221C Instruction
Manual Section
RID None Settings Sheets for the
SEL-311C Relay
Section 3—Set n
TID = ID
CTR = CTR Settings Sheets for the
SEL-311C Relay
Section 5—Current and Potential
Transformer Ratio Selection
CTRP = CTR
PTR = PTR
PTRS = PTR
Z1MAG
Settings Sheets for the
SEL-311C Relay
Section 5—R1, X1, R0, X0, and
Line Length (LL)
Z1ANG
R1
2
X1
2
+()=
CTR
PTR
------------
•
Arc tan
X1
R1
-------
= (degrees) = MTA