4-46
Protection and Control
BE1-951
Figure 4-27. 60FL Element
Figure 4-28. 60FL Element
The function includes two independent outputs, 25VM1 and 25VM2 as illustrated in Figure 4-26. The logic
conditions are summarized in Table 4-37. Any combination of logic settings can be selected as shown in
Table 4-36. When a logic condition is selected, it closes the respective switch in Figure 4-25 associated with
each of the outputs. The two independent logic outputs might be used to set up different closing supervision
criteria for automatic reclose versus manual close used, for example.
Table 4-37. Voltage Monitor Logic Settings
Voltage Monitor Logic
Condition
Logic Setting
Dead Phase and Dead Aux
1
Dead Phase and Live Aux
2
Live Phase and Dead Aux
3
VOLTAGE TRANSFORMER FUSE LOSS DETECTION
BE1-951 relays have one 60FL element that can be used to detect fuse
loss or loss of potential in a three-phase system. The 60FL element is
illustrated in Figure 4-27. When the element logic becomes TRUE, the
60FL logic output becomes TRUE. A logic diagram is shown in Figure 4-
28.
Logic: 60FL = (A * B * C * D * G) + (E * F * B * G)
