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KLF-1 Loss-of-Field Relay
tance, Xd. The short-reach should be set
equal to one-half transient reactance, Xd /2 .
The trip circuit should be energized directly,
with no time delay. The alarm circuit should
operate a timer which may be set from 0.4 to
1.0 seconds, depending on use preference.
If the condition persists, this timer permits
tripping.
The second-zone KLF-1 may be set with a
larger impedance characteristic and will
detect partial loss-of-field conditions. A typi-
cal setting would be to just allow the machine
to operate at maximum hydrogen pressure
and .95 per unit voltage. If a low voltage con-
dition occurs, it is recommended that tripping
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
RECOMMENDED SETTINGS FOR KLF-1 RELAY
ZONE 1 (ALONE)
See Figure 11 (page 25)
(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
ZONE 1 (ALONE)
See Figure 11 (page 25)
(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
be accomplished through a timer set for 0.6
seconds. Added to the X unit dropout time of
0.4 seconds, this gives an overall time of 1.0
second. If the voltage is maintained, then the
alarm circuit should start a "last ditch" timer.
This timer may be set anywhere from 10 sec-
onds to one minute, depending on machine
type and user preference.
7.0 SETTING THE RELAY
The type KLF-1 relay requires a setting for each of
the two compensators T
auto-transformers primaries S
undervoltage unit.
Table 1:
ZONE 2 (ALONE)
See Figure 12 (page 26)
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
Table 2:
ZONE 2 (ALONE)
See Figure 12 (page 26)
87%
1/4 to 1 sec
(1 sec preferred)
10 sec for cond. cooled.
25 sec for conv. cooled.
41-748.31B
and T
, for each of the two
A
C
and S
, and for the
A
C
BOTH ZONE 1 &
ZONE 2
See Figure 11 & 12
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 & ZONE 2
See Figure 11 & 12
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
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