Ashida ADR241B, Instruction Manual

Page: 97 / 272

ADR241B
Doc ID : ADR241B-DO_IM_01
Ref ID : ADR241B/IM/PLF
Rev No. : 06
Page No. : 97 of 272
Fig. 7 show conventional 3 Phase and Earth fault (3OC+1EF) here user can use as Ground
Earth Fault (IE Measured) or Residual Earth fault (3Io) measured earth fault for earth fault
detection depend upon external wiring.
Figure 7: Logic Diagram for Conventional 3OC + 1EF Connection
Fig 8: in this case Ground Earth fault can be use as Restricted Earth fault (REF) and
Residual Erath fault 3Io can be use as earth fault
Figure 8: Logic Diagram for 3OC + 1EF + 1REF Connection