ABB KD-10 Instruction Leaflet page 22

41-490J
versely, decreasing the P
in smaller angles.
For lower maximum torque angle than 70 de-
grees move red lead on fixed phase-shifting re-
sistor R and R
2A 2C
Where R and R
2A
combination with P
the lead.
b. Use the No. 4 test connection and repeat the
procedure above for checking the T
sator.
15.2 SPRING RESTRAINT
a. Use test No. 1 connections except reverse the
voltage phase sequence by interchanging the
Brush connections so that Brush No. 1 is con-
nected to 3F and Brush No. 2 is connected to 1F.
b. Adjust the voltage V
each with Brush No. 2 and Brush No. 1 respec-
tively. Position the moving-contact spring adjust-
er so that the contact just floats and then return
the circuit connections to normal with Brush No.
1 to 1F and Brush No. 2 to 3F. De-energize the
relay. Spring should reset the contacts.
15.3 CONTACT ADJUSTMENT
The procedure for contact adjustment for the
phase-to-phase unit is identical to that described for
three-phase unit.
15.4 IMPEDANCE CHECK
Using the connections for Test Nos. 5, 6, and 7, set
the phase-shifter so that the current lags voltage by
θ
. The current required to trip the phase-to-phase
m
unit should be within the limits specified for each of
the voltages. Note that for the phase-to-phase unit
t h e i m p e d a n c e m e a s u r e d b y t h e r e l a y i s
V
L L –
Z where V
= -------------- -
L-L
R
2I
L
voltage and I is phase current.
L
The current required to close contacts of the top unit
should be:
22
or P value results
2A 2C
to the opposite terminal.
are adjustable, use it in
2C
and P without moving
2A 2C
compen-
B C
and V for 3.5 volts
1F2F 2F3F
is phase-to-phase fault
Type KD-10 and KD-11 Compensator Distance Relay
Relay Range
V = V (Volts)
fault 1F-2F
∆ Trip Current (amps) 13.3 - 14.7 2.85 - 3.15 1.63 - 1.80
Phase-shifter
Set at current lagging
V (θ )
1F-2F m
∆ For current limits when θ m maximum torque angle is not 75°, multi-
ply the values above by
angle for which the relay was calibrated.
For test voltages to be of correct sequence and val-
ues, use the following equation:
V V
=
1 1F 2 2F
–
15.5 INDICATING CONTACTOR SWITCH (ICS)
Close the main relay contacts and pass-sufficient dc
current through the trip circuit to close the contacts
of the ICS. The current should not be greater than
the particular ICS tap setting being used for the
0.2–2.0 ampere ICS. The operation indicator target
should drop freely.
The contact gap should be approximately 0.047" for
the 0.2/2.0 ampere unit between the bridging moving
contact and the adjustable stationary contacts. The
bridging moving contact should touch both station-
ary contacts simultaneously.
16.0 COMPENSATOR CHECK
Accuracy of the mutual impedance Z
pensators is set within very close tolerances at the
factory and should not change under normal condi-
tions. The mutual impedance of the compensators
can be checked with accurate instruments by the
procedure outlined below.
a. Set T, T , T , T
A B
on the 1.23 tap for
5.80 tap for
10.0 tap for
b. Disconnect the "L" leads of sections M, M
M and the red-marked leads of R
C
(with resistor loading removed θ = 90°.
R
2C
.2 - 4.5 .75 - 21.2 1.3 - 36.6
30 30
75° 75°
sin 75
where β = new maximum torque
-------------- -
β
sin
V – V
in fault
= ---------------------------- -
–
2
of the com-
C
, and T
B C
.2 - 4.5 range
.75 - 21.2 range
1.3 - 36.6 range
, R
3
30
75°
[Equ. 24]
, and
A
, and
2A