14.6
SEL-311C Relay Instruction Manual Date Code 20060320
Application Settings for SEL-221 Series Relays
SEL-221G to SEL-311C Settings Conversion Guide
Convert SEL-221G
Output Mask Logic
Settings to SELOGIC
Control Equations
See Programmable Output Contact Mask Settings in Section 5: Applications
in the SEL-221G Instruction Manual for a description of output masks. In the
SEL-311C, output masks are replaced by SEL
OGIC control equations as
shown in Table 14.2.
Table 14.3 shows all SEL-221G Relay Word bits, and an approximate
equivalent SEL-311C SEL
OGIC expression, when setting APP = 221G in the
SEL-311C. Table 14.2 shows each SEL-221G Mask Logic Setting and the
equivalent SEL-311C SEL
OGIC control equation. To convert an SEL-221G
Mask Logic Setting to a SEL
OGIC control equation, logically OR each
ORDER Q
V
I
= 32QE
= 32VE
= 32IE
Directional Control for Ground
Distance and Residual Ground
Overcurrent Elements on
page 4.9
Section 2—Directional Elements
79OI1 = 79OI1 Section 6: Close and Reclose
Logic
Section 5—Reclose Logic
79OI2 = 79OI2
79OI3 = 79OI3
79RSD None (SEL-221G setting 79RS serves a
slightly different purpose.)
Reclosing Relay Timer Settings
on page 6.14
Section 6—79RS Timer Eliminates
Standing Close
79RSLD None
52AEND = 52BT (Pickup Switch-Onto-Fault Trip Logic
on page 5.7
Section 5—High Set Phase Over-
current Setting (50H)
SOTFD = 52BT (Dropout)
TDURD = TDUR Unlatch Trip on page 5.4 Section 5—Trip Duration Timer
(TDUR)
SV1PU = 50MFD
a
SEL-311C phase-to-phase fault detector settings 50PP1, 50PP2, and 50PP3 are set to 0.1 •I
NOM
and are hidden. This corresponds to
SEL-221G setting 50L.
b
Curve U1 in the SEL-311C is slightly different from curve 1 in the SEL-221G. Time dial adjustments may be necessary.
c
The SEL-221G uses a circular out-of-step characteristic. The SEL-311C uses a quadrilateral out-of-step characteristic.
Table 14.1 SEL-311C Settings Calculated From SEL-221G Settings (Sheet 3 of 3)
SEL-311C
Setting
a
Calculated From SEL-221G Settings
SEL-311C Instruction
Manual Section
SEL-221G Instruction
Manual Section
Table 14.2 SEL-311C SELOGIC Equation Equivalent to Each SEL-221G Mask
Logic Setting
SEL-221G Settings Mask SEL-311C SELOGIC Control Equations
MTU TR
MPT SV2 (DTT)
MTB SV3 (DTT)
MTO TRSOTF
MA1 OUT104
MA2 OUT105
MA3 OUT106
MA4 OUT107
MRI 79RI
MRC 79DTL
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