14.19
Date Code 20060320 Instruction Manual SEL-311C Relay
Application Settings for SEL-221 Series Relays
SEL-221H to SEL-311C Settings Conversion Guide
Application Settings
From Access Level 2, set the SEL-311C application setting to “221H” as
shown below:
=>>SET APP TERSE <Enter>
Line Parameter Settings:
Application
(311C,221G,221G5,221H,221F,221F3,221C,221-16,2PG10)APP = 311C ? 221H <Enter>
Enable Settings:
Fault Location(Y,N) EFLOC = Y ? END <Enter>
Save Changes(Y/N)? Y <Enter>
Settings saved
=>>
Convert SEL-221H
Primary Quantities to
SEL-311C Secondary
Quantities
All SEL-221H current settings must be converted from primary to secondary
amps to be used in the SEL-311C. Divide the SEL-221H current setting by the
current transformer ratio setting (CTR) to make the change.
SEL-221H 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 14.3
Convert SEL-221H
Settings to SEL-311C
Settings
Table 14.9 shows all the SEL-311C settings that must be entered for the relay
to perform protection similar to the SEL-221H when APP = 221H. Calculate
each SEL-311C setting from SEL-221H settings using the formula shown.
Instruction manual references are to subsection headings rather than to section
headings.
where:
Z1% = the SEL-221H 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 14.9 SEL-311C Settings Calculated From SEL-221H Settings (Sheet 1 of 3)
SEL-311C
Setting
a
Calculated From SEL-221H Settings
SEL-311C Instruction
Manual Section
SEL-221H 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—Choosing Current and
Potential Transformers
CTRP = CTR
PTR = PTR
PTRS = PTR
Z1MAG
Settings Sheets for the
SEL-311C Relay
Section 5—Choice of
Line Impedances
Z1ANG
Section 5—Choice of Maximum
Torque Angle (MTA)
R1
2
X1
2
+()=
CTR
PTR
------------
•
Arc tan
X1
R1
-------
= (degrees) = MTA
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