Schweitzer Engineering Laboratories SEL-352-1 - Load Current Protection Scheme 1; Load Current Protection Scheme 2

Date Code 20010731 Setting the Relay 7-21
SEL-352-1, -2 Instruction Manual
Load Current Protection Scheme 1
The default SEL
OGIC control equation settings for the load current protection logic Scheme 1
follow:
LLAS =!/TRIPA*TRIPA*50LDA
LLAR =!50LDA
LLBS =!/TRIPB*TRIPB*50LDB
LLBR =!50LDB
LLCS =!/TRIPC*TRIPC*50LDC
LLCR =!50LDC
LPA =LLAQ
LPB =LLBQ
LPC =LLCQ
LDA =LLAQ
LDB =LLBQ
LDC =LLCQ
L52S =NA
L52R =NA
AP =NA
AF =NA
LPF =LPAD + LPBD + LPCD
LBF =LDAD + LDBD + LDCD
Load Current Protection Scheme 2
The default SEL
OGIC control equation settings for the load current protection logic Scheme 2
follow:
LLAS =!/TRIPA*TRIPA*50LDA
LLAR =!50LDA
LLBS =!/TRIPB*TRIPB*50LDB
LLBR =!50LDB
LLCS =!/TRIPC*TRIPC*50LDC
LLCR =!50LDC
LPA =LLAQ
LPB =LLBQ
LPC =LLCQ
LDA =LLAQ
LDB =LLBQ
LDC =LLCQ
L52S =/TRIP3
L52R =!52AA*!52AB*!52AC + 86BFT
AP =L52Q
AF =L52Q
LPF =LPAD + LPBD + LPCD + APD
LBF =LDAD + LDBD + LDCD + AFD