Impedance Setting; Voltage Setting - ABB KLF Instruction Leaflet

KLF Loss-of-Field Relay

IMPEDANCE SETTING

VOLTAGE SETTING

TD-1
TD-2
ADVANTAGES
Special Settings for Multi Machines Bussed at Machine Terminals
IMPEDANCE SETTING
VOLTAGE SETTING
TD-1
TD-2
Table 1
Recommended Settings for KFL Relay
Zone 1 (Alone)
See Figure 5
(a) Contact shorted or
(b) Set at 80% for security
1/4 to 1 sec
(1 sec preferred)
Not required for
(a) above
(b) for above use 1 min.
Less sensitive to stable
system swings
Table 2
Zone 1 (Alone)
See Figure 5
(a) Contact shorted or
(b) Set at 87% for security
1/4 to 1 sec
(1 sec preferred)
Not required for
(a) above
(b) for above use 10 sec
for cond. cooled, 25 sec
for conv. cooled
Zone 2 (Alone)
See Figure 6
80%
1/4 to 1 sec
(1 sec preferred)
1 min.
1) More sensitive to
LOF condition
2) Can operate on
partial LOF
3) Provide alarm
features for manual
operation
Zone 2 (Alone)
See Figure 6
87%
1/4 to 1 sec
(1 sec preferred)
10 sec for cond. cooled
25 sec for conv. cooled
41-748P
Both Zone 1 and Zone 2
See Figures 5 & 6
Zone 1 voltage contact
shorted with Zone 2 set
at 80%
Zone 1 timer = 1/4 sec
Zone 2 timer = 1 sec
1 min.
(1) Same as 1), 2) and
3) at left.
(2) Provides back-up
protection
Both Zone 1 and Zone 2
See Figures 5 & 6
Zone 1 voltage contact
shorted with Zone 2 set
at 87%
Zone 1 timer = 1/4 sec
Zone 2 timer = 1 sec
10 sec for cond. cooled
25 sec for conv. cooled
9