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4. CHARACTERISTICS
The tupe KLF relay is available in one range. Long
Reach ohms -2.08 to 56. Short Reach ohms -0.79 to
18.0
4.1. DISTANCE UNIT
The distance unit can be set to have characteristic
circles that pass through origin, include it, or exclude
it, as shown in figure 5.
The Z
and Z
values are determined by compensa-
A
C
tor settings and modified by autotransformer settings
S, L, and R. The impedance settings in ohms reach
can be made for any value from 1.08 to 56 ohms for
Z
, and from 0.79 ohm to 18 ohms fro Z
A
3 percent.
The taps are marked as follows:
-------------------------------------------------------------------------------------------- -
,
,
,
2.4 3.16 4.35 5.93 8.3 11.5 15.8
-------------------------------------------------------------------------------------------- -
,
,
,
0.0 0.19 1.27 1.82 2.55 3.64 5.1
(
-------------------- -
(
M
-------------------------------------------------------------------------------------------- -
±
values between taps .03, .06, .06
4.2. DIRECTIONAL UNIT
The KLF relay is designed for potential polarization
with an internal phase shifter, so that maximum
torque occurs when the operating current leads the
polarizing voltage by 43 degrees. The minimum
pickup has been set by the spring tension to be
approximately 1 volt and 5 ampere at maximum
torque angle.
4.3. UNDERVOLTAGE UNIT
The undervoltage unit is designed to close its con-
tacts when the voltage is lower than the set value.
The undervoltage unit is energized with V
contacts can be adjusted to close over the range of
60 to 100 percent of normal system voltage. The
actual range of adjustment is 40 to 70 V
dropout ratio of the unit is 98 percent or higher.
4.4. TRIP CIRCUIT
The main contacts will safely close 30 amperes at
in steps of
C
T
A
,
,
,
T
C
,
,
,
,
)
S
S
A
C
, ,
1 2 3
,
)
M
A
C
PH.3-N
L-N
250 volts dc and the seal-in contacts of the indicating
contactor switch will safely carry this current long
enough to trip a circuit breaker.
The indicating contactor switch has two taps that pro-
vide a pick-up setting of 0.2 or 2 amperes. To change
taps requires connecting the lead located in front of
the tap block to the desired setting by means of a
screw connection.
4.5. TRIP CIRCUIT CONSTANT
Indicating Contactor Switch (ICS)
0.2 ampere tap - 6.5 ohm dc resistance
2.0 ampere tap - 0.15 ohm dc resistance
4.6. BURDEN
T
& T
A
C
Settings
Max.
Min.
Phase 1
S = 1
S = 2
S = 3
Phase 2
phase 3
. The
4.7. THERMAL RATINGS
. The
Potential: 75 volts (L-N) continuous
Current: 8 amperes continuous
200 amperes for 1 second
Current at 5 Amps
VA
Angle of lag
60 Hz
50 Hz
60 Hz
12.05
10.6
58˚
4.17
3.94
36˚
Potential at 69 Volts
(Phase-to-Ground)
VA
Angle of lag
60 Hz
50 Hz
60 Hz
6.1
6.1
9˚
1.5
1.5
9˚
0.7
0.7
9˚
3.18
2.9
48˚
2.76
2.55
43˚
DC Circuit
Rating
Watts @ Rated
125
3.9
250
7.8
I.L. 41-748.1F
50 Hz
53˚
31˚
50 Hz
7.5˚
7.5˚
7.5˚
43˚
38˚
7
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