Installation; External Connections - ABB KD-10 Instruction Leaflet

Type KD-10 and KD-11 Compensator Distance Relay
The sign of the "M" value is determined by which
lead is in the higher position on the tap plate. The
sign is positive (+) if the L lead is higher and negative
(-) if the R lead is higher.
An "M" setting may be made in the following manner.
Remove the connector screws so that the L and R
leads are free. Determine from the Tables I to III the
desired "M" value. Neither lead connector should
make electrical contact with more than one tap at a
time.
7.4 LINE ANGLE ADJUSTMENT
Maximum torque angle adjustment, if required, is ac-
complished by adjusting the compensator loading
resistors P3, P , and P
2A
pair Calibration, for procedure.
7.5 INDICATING CONTACTOR SWITCH (ICS)
Connect the lead located in front of the tap block to
the desired setting by means of the connecting
screw. When the relay energizes a 125 or 250 volt dc
type WL relay switch, or equivalent, use the 0.2 am-
pere tap; for 48 volt dc applications set the unit in a
tap 2 and use a type WL relay with a S#304C209G01
coil, or equivalent. The relay is shipped set for 2.0
tap.

8.0 INSTALLATION

The relays should be mounted on switchboard pan-
els or the equivalent in a location free from dirt, mois-
ture, excessive vibration and heat. Mount the relay
vertically by means of the mounting stud for the type
FT projection case or by means of the four mounting
holes on the flange for the semi-flush type FT case.
Either the stud or the mounting screws may be uti-
lized for grounding the relay. The electrical connec-
tions may be made directly to the terminals by
means of screws for steel panel mounting or to the
terminal stud furnished with the relay for thick panel
mounting. The terminal stud may be easily removed
or inserted by locking two nuts on the stud and then
turning the proper nut with a wrench.
For detail information on the FT case refer to Instruc-
tion Leaflet 41-076. The relay contacts should stay
open with panel de-energized.

9.0 EXTERNAL CONNECTIONS

Figure 19 (page 50) shows the connections for
3-zone protection utilizing the TD-4 timer. Figure 24
(page 53) is similar to Figure 19 except that the
. Refer to Section 13, Re-
2C
TD-52 timer is used instead of the TD-4. Figure 20
(page 51) and Figure 21 (page 51) show the use of
a 15/5 auxiliary current transformer so that the CT
neutral may be formed elsewhere.
Ac connections for additional applications are shown
in Figures 20 (page 51), 21 page 51), 22 (page 52)
and 23 (page 52). Three of these, Figures 20, 21,
and 22 apply when the transmission line is terminat-
ed in a power transformer, and when low side volt-
age and current are used to energize the relays. In
calculating the reach setting, the bank impedance
must be added to the line impedance.
For the case of a wye-delta bank (Figures 21 and 22)
the voltages and currents are phase-shifted by 30;
however, this fact should be ignored, as the KD-10
a n d K D - 1 1 r e l a y s a r e n o t a f f e c t e d b y t h i s
phase-shift.
Figure 23 shows a KD-10 and TD-5 relay connected
for generator back-up protection.
10.0 SWITCHBOARD TESTING
Immediately prior to placing the relay in service, the
external wiring can be checked by manipulating the
current and voltage applied to the relay. If such a
check is desired, refer to Appendix A for the proce-
dure.
10.1 CURRENT VOLTAGE RELAYS WITH
MUTUAL REACTOR PRECAUTIONS
Relays which include compensators to modify the
applied voltage (such as the KD types) will produce
an output at their voltage terminals when the current
circuits are energized.
Thus, it is possible to pull potential fuses and still
have v oltage a ppear o n the relay side of the fuses.
The magnitude of this voltage is dependent on mag-
nitude of load or fault current, relay settings, relay im-
pedance, and other potential circuit burden connect-
ed i n pa ra lle l wi th the re lay c onta ini ng th e
compensator.
To avoid any difficulties due to interaction between
current and voltage circuits, it is recommended that
when PT fuses have been pulled to permit work on
voltage circuits, that these circuits should not be con-
sidered safe until the current circuits have been
de-energized, or until the voltage circuits have been
shorted on the relay side of the fuses.
41-490J
11