Schweitzer Engineering Laboratories SEL-311C - Table 14.28 SEL-311 C Settings Calculated from SEL-221-16 Settings

14.48
SEL-311C Relay Instruction Manual Date Code 20060320
Application Settings for SEL-221 Series Relays
SEL-221-16 to SEL-311C Settings Conversion Guide
Application Settings
From Access Level 2, set the SEL-311C application setting to “221-16” as
shown below:
=>>SET APP TERSE <Enter>
Line Parameter Settings:
Application
(311C,221G,221G5,221H,221F,221F3,221C,221-16,2PG10)APP = 311C ? 221-16 <Enter>
Enable Settings:
Fault Location(Y,N) EFLOC = Y ? END <Enter>
Save Changes(Y/N)? Y <Enter>
Settings saved
=>>
Convert SEL-221-16
Primary Quantities to
SEL-311C Secondary
Quantities
All SEL-221-16 current settings must be converted from primary to secondary
amps to be used in the SEL-311C. Divide the SEL-221-16 current setting by
the current transformer ratio setting (CTR) to make the change.
SEL-221-16 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 14.7
Convert SEL-221-16
Settings to SEL-311C
Settings
Table 14.28 shows all the SEL-311C settings that must be entered for the relay
to perform protection similar to the SEL-221-16 when APP = 221-16.
Calculate each SEL-311C setting from the corresponding SEL-221-16 setting
using the formula shown. Instruction manual references are to subsection
headings rather than to section headings.
Carefully note the difference between the SEL-311C and SEL-221-16 in the
implementation of certain protection and logic schemes. For example,
reclosing settings do not correspond exactly between the two relays. Always
thoroughly test logic schemes to be sure they operate as intended.
where:
Z1% = the SEL-221-16 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 14.28 SEL-311C Settings Calculated From SEL-221-16 Settings (Sheet 1 of 3)
SEL-311C
Setting
a
Calculated From SEL-221-16 Settings
SEL-311C Instruction
Manual Section
SEL-221-16 Instruction
Manual Section
RID None Settings Sheets for the
SEL-311C Relay
Section 3—Set
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)
R1
2
X1
2
+()
=
CTR
PTR
------------
•