ABB KD-10 Instruction Leaflet page 18

41-490J
13.2 SHAFT CLEARANCE
The upper pin bearing should be screwed down until
there is approximately .025 inch (one complete turn
of the screw) between it and the top of the shaft
bearing. The upper pin bearing should then be se-
curely locked in position with the lock nut. The lower
bearing position is fixed and cannot be adjusted.
13.3 AUTO-TRANSFORMER CHECK
Auto-transformers may be checked for turns ratio
polarity by using the No. 1 test connections of Figure
25 (page 54), and the procedure outline below.
Set S, S , and S on tap number 3. Set the "R" leads
A C
of M, M , M all on 0.0 and disconnected all the "L"
A C
leads. Adjust the voltages V
volts. Measure the voltage from terminal 8 to the #1
tap of S and S . It should be 29.4 volts. From 8 to the
A
#2 tap of S and SA should be 58.6 volts. The voltage
should read 29.4 volts from 8 to S
from 8 to S = 2.
C
Set S, S , and S on 1 and adjust V
A C
for 100 volts. Measure the voltage drop from terminal
8 to each of the M and the M
should be equal to 100 (1 + the sum of values be-
tween R and the tap being measured). Example
100(1+.03+.09) = 112 volts.
Check the taps of M in the same manner. Trans-
C
former that have an output different from nominal by
more than 1.0 volts probably have been damaged
and should be replaced.
13.4 DISTANCE UNIT CALIBRATION
a. Make the following relay settings:
Relay Range .2 - 4.5
T, T , T , T , T 1.23
A B B C
+.15
M, M , M
A C
1.0
S, S , S
A C
b. Read Section 11.1, ELECTRICAL TESTS
(page 12) and Section 12.1, DISTANCE UNITS
(page 17), to become familiar with testing con-
nections, instrumentation, and measurements.
Use Figure 25 (page 54) or 26 for test connec-
tions.
18
and V for 90
1F2F
2F3F
= 1 and 58.6 volts
C
and V
1F2F 2F3F
taps. This voltage
A
.75 - 21.2 1.27 - 36.6
5.8 10.0
+.15 +.15
1.0 1.0
Type KD-10 and KD-11 Compensator Distance Relay
14.0 THREE-PHASE UNIT
(LOWER UNIT) P
P ADJUSTMENTS.
3A
Use test connections #1 and set V
volts. The current required for test should be:
Relay Range
Current
Phase-shifter Settings
The Nominal M-T-Angle
For others angles set test current according to Equa-
tion (12), page 9.
14.1 P ADJUSTMENT
3
To check the P adjustment, measure voltage
3
across C . Vary phase angle in both directions of
3A
the set value, to see that a low voltage across C
(below 1 volt) is obtained at the maximum torque an-
gle setting. If minimum voltage is within 2 degrees,
do not readjust. If the minimum voltage is obtained at
some other angle readjust phase-shifting resistor or
potentiometer (P ) at the desired angle.
3
14.2 CORE ADJUSTMENT
For an initial adjustment of the core, restraint spring
is to be set as above per Section 13.1, INITIAL
SPRING SETTING (page 17). The relay should be
preheated for at least one hour in the case with
closed cover to compensate for effects of self-heat-
ing.
a. Connect relay terminal 8 and 9 together, apply
rated ac voltage between terminals 7 and 8. Ad-
just core by turning it slightly until the contact arm
floats or restrains very slightly.
b. KD-10 ONLY: Connect the relay terminals 7 and
8 together and apply rated ac voltage between 7
and 9. Adjust core until the contact arm just floats
or restrains very slightly. If this is not possible, ro-
tate core 90° and adjust. Recheck part "1" to de-
termine if contact is floating or restraining. If not,
repeat parts 1 and 2.
14.3 P ADJUSTMENT
3A
Remove current. Connect relay terminals 7 and 9 to-
gether and apply rated ac voltage between 7 and 8.
, CORE, &
3
= V = 25
2F1F 2F3F
.2 - 4.5 .75 - 21.2 1.3 - 36.6
15.6 3.3 1.92
60° 75° 75°
60° 75° 75°
3A