14.44
SEL-311C Relay Instruction Manual Date Code 20060320
Application Settings for SEL-221 Series Relays
SEL-221C to SEL-311C Settings Conversion Guide
For example, the factory default setting for MTU in the SEL-221C is shown in
Table 14.27. From Table 14.25, the equivalent SEL-311C SEL
OGIC control
equation to MTU is TR. Constructing the logical OR of the equivalent of each
element selected in the MTU mask from Table 14.26 gives:
TR = 51PT + MABC1 + 51GT + 67G1 + MPP1 + 67G2T + 67G3T + M3PT + OC +
IN101
Since IN101 (DT) is also included in the DTT tripping logic equation, it can
be eliminated from the TR equation. Also, MABC1 + MPP1 can be replaced
by M1P. Therefore, the TR equation becomes:
TR = M1P + M3PT + 67G1 + 67G2T + 67G3T + 51PT + 51GT + OC
which is the default SEL
OGIC control equation for TR when APP = 221C.
When setting APP = 221C, the SEL-311C automatically sets the following
SEL
OGIC control equations. Change the settings just as you would change the
Mask Logic settings in an SEL-221C to customize the relay logic.
51NT 51GT
67N1 67G1
67N2 67G2
67N3 67G3
51NP 51G
Z1P MPP1
Z2P MPP2
Z3P MPP3
DF 32GF
DR 32GR
Z2GT 67G2T
Z3GT 67G3T
50MF SV1T (SV1 = 50P2 * ILOP)
RC None (SEL
OGIC equation 79DTL)
RI None (SEL
OGIC equation 79RI)
Z3PT M3PT
50M 50P2
TRIP TRIP or OUT101 or OUT102
TC OC
DT IN101
52BT SOTFE
59N 59N1
Ta ble 1 4. 26 SE L
OGIC Equivalent to SEL-221C Relay Word Bits (Sheet 2 of 2)
SEL-221C Relay Word Bit
Equivalent
SEL
OGIC Expression
Table 14.27 Default SEL-221C Mask Logic Setting for MTU (Sheet 1 of 2)
51PT 1ABC 2ABC 3ABC 51PP 50H 50L LOP
11000000
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