ABB REU 523 - Page 24

24
1MRS 750942-MUM
Combined Overvoltage and Undervoltage Relay
Technical Reference Manual
REU 523
SGF2/3 Tripping of stage U<< when conventional undervoltage
measurement is in use
• 0 = normal use for detecting loss of voltage when all voltages fall
below the set value
• 1 = more sensitive tripping: the stage starts the moment one of
the phases falls below the set start value. To avoid unnecessary
start situations, the start voltage of stage U<< is to be set to 0.6 x
U
n
or below.
0
SGF2/4 Internal blocking of stage U< when the measured voltage falls
below 0.2 x U
n
• 0 = internal blocking of U<
• 1 = no internal blocking of U<
0
SGF2/5 Internal blocking of stage U<< when the measured voltage falls
below 0.2 x U
n
• 0 = internal blocking of U<<
• 1 = no internal blocking of U<<
0
SGF2/6 Inhibition of stage U>>
• 0 = stage U>> is not inhibited
• 1 = stage U>> is inhibited
0
SGF2/7 Inhibition of stage U<<
• 0 = stage U<< is not inhibited
• 1 = stage U<< is inhibited
0
SGF2/8 Blocking of the tripping of stage U< by the start of stage U<<
• 0 = tripping of stage U< is not blocked
• 1 = tripping of stage U< is blocked
0
Σ SGF2 0
Table 4.1.4.6-4 SGF3
Switch Function
Default
setting
SGF3/1 The operation mode of the start indication of stage U>
• 0 = the start indication will automatically be cleared once the
fault has disappeared
• 1 = latching. The start indication will remain active although the
fault has disappeared.
0
SGF3/2 The operation mode of the trip indication of stage U>
• 0 = the trip indication will automatically be cleared once the fault
has disappeared
• 1 = latching. The trip indication will remain active although the
fault has disappeared.
1
SGF3/3 The operation mode of the start indication of stage U>>
• 0 = the start indication will automatically be cleared once the
fault has disappeared
• 1 = latching. The start indication will remain active although the
fault has disappeared.
0
SGF3/4 The operation mode of the trip indication of stage U>>
• 0 = the trip indication will automatically be cleared once the fault
has disappeared
• 1 = latching. The trip indication will remain active although the
fault has disappeared.
1
Table 4.1.4.6-3 SGF2
Switch Function
Default
setting