Protection Engineering Basics and Schemes Protection Engineering | Page 93

when in case of fault , the tripping relay 94 activated and
same time lock out relay 86 operated , and break switch
27 will close and Reset Switch (make switch) will be at
apart(off) position , the lock out relay can be reset
electrically or manually , wiring shows that manual
connection is bypassing the electrical reset circuit. When
we reset electrically or manually the 25 make switch will
be make but sensing from 27 will remain intact, if fault
still in circuit the relay will not reset and circuit remain
off. Also not 27 and 25 are coupled, one will on at a time.
pg. 93