Schweitzer Engineering Laboratories SEL-421-4 - Figure 5.99 Trip Logic Diagram

5.142
SEL-421 Relay Instruction Manual Date Code 20171021
Protection Functions
Trip Logic
Figure 5.99 Trip Logic Diagram
1
CYC
0
PTRX
ECOMM := N
UBB
E3PT
SPO
Z3RBC
Z3RBB
Z3RBA
ECOMM = POTT3
Z3RB
ECOMM := POTT2
ECOMM := DCB
ECOMM := POTT
DSTRT
BTX
DTA
SPOA
SPOB
SPOC
DTB
DTC
DTR
TR
TRSOTF
SOTFE
FSA
|mAG1F|
|mBCF|
67Q2
67G2
TRCOMM
Z3RB
SPO
PTDRX
TRCOMMD
ECTT
ECTTA
ECTTB
ECTTC
EWFC :=Y, SP
Z2P
ECOMM := POTT3
ECOMM=POTT2
PT3
E3PT
3PT
3φ
φa
φb
φc
Z1G
SOTFT
3-Phases
Selected
RX Trip
Permission
Comm.-Assisted
Trip Permission
Z2GT
Z2GTSP := Y
67QGSP := Y
ECOMM := POTT3
XAG2
XAG2
Z2P
PTA
ECOMM := POTT3
ECOMM := POTT3
ECTTA
ECTT
Z3RBA
XAG1
MAG1
MAG2
MAG2
APS
ECOMM := POTT3
APS
COMPRM
TRPRM
RXPRM
3PS
DTA
SPOA
27AWI
EWFC := SP
CPS
BPS
APS
PTDRX