Schweitzer Engineering Laboratories SEL-352-1 - Thermal Protection of Trip and Close Resistors; Flashover Protection Scheme 1

7-22 Setting the Relay Date Code 20010731
SEL-352-1, -2 Instruction Manual
Thermal Protection of Trip and Close Resistors
The default SEL
OGIC control equation settings for the thermal protection logic follow:
OPA =37OPA*87THA
OPB =37OPB*87THB
OPC =37OPC*87THC
LTAS =CLOSE + MCLOSE
LTAR =TRIPA
LTBS =CLOSE + MCLOSE
LTBR =TRIPB
LTCS =CLOSE + MCLOSE
LTCR =TRIPC
TRMEA =OPAD*!LTAQ
TRMEB =OPBD*!LTBQ
TRMEC =OPCD*!LTCQ
CRMEA =OPAD*LTAQ*!(52AA*X27DA*Y59LA + 52AA*Y27DA*X59LA) NOTE: !(X + Y) => !X * !Y
CRMEB =OPBD*LTBQ*!(52AB*X27DB*Y59LB + 52AB*Y27DB*X59LB) !(X * Y) => !X + !Y
CRMEC =OPCD*LTCQ*!(52AC*X27DC*Y59LC + 52AC*Y27DC*X59LC)
TTF =(26TFA*50MNA) + (26TFB*50MNB) + (26TFC*50MNC)
CTF =(26CFA*50MNA) + (26CFB*50MNB) + (26CFC*50MNC)
Flashover Protection Scheme 1
The default SEL
OGIC control equation settings for the flashover protection logic Scheme 1
follow:
F1A =87HA
F1B =87HB
F1C =87HC
F2A =50LDA
F2B =50LDB
F2C =50LDC
F3A =TRIPA + CLOSE + MCLOSE
F3B =TRIPB + CLOSE + MCLOSE
F3C =TRIPC + CLOSE + MCLOSE
LHAS =NA
LHAR =NA
LHBS =NA
LHBR =NA
LHCS =NA
LHCR =NA
LVAS =F1AD*!87HA*!F2AD*50LDA*!87FOA*!F3AD
LVAR =!(50LDA*!F3AD*!87FOA)
LVBS =F1BD*!87HB*!F2BD*50LDB*!87FOB*!F3BD
LVBR =!(50LDB*!F3BD*!87FOB)
LVCS =F1CD*!87HC*!F2CD*50LDC*!87FOC*!F3CD
LVCR =!(50LDC*!F3CD*!87FOC)
FPA =LVAQ
FPB =LVBQ
FPC =LVCQ
FFA =LVAQ
FFB =LVBQ
FFC =LVCQ
FOPF =FPAD + FPBD + FPCD
FOBF =FFAD + FFBD + FFCD