ABB KD-10 Manual

Effective: April 1981
NEW INFORMATION
ABE Power T&D Company Inc.
Relay Division
Coral Springs, FL 33065
Instruction Leaflet
I.L. 41-498.5
Type KD Compensator
Distance Relays Calibration
and Maintenance Procedures
These instructions are intended to supplement
Instruction Leaflets 41-491, 41-498.11, 41-491.4,
41-498.12 and 41-490, covering the KD-1, 4, 41,
5, 10, and 11 line of compensator distance relays,
respectively. These instructions expand on the in-
formation given in these I.L.'s and suggest what
elements should be included in a calibration and
maintenance program.
A calibration and maintenance program
should involve two steps: 1) a receiving accept-
ance check and 2) a routine (periodic) mainten-
ance program. These two steps are outlined below:
RECEIVING ACCEPTANCE
Received relays should be subjected to the
checks outlined in the applicable I.L. These checks
will insure that there is no shipping damage and
that the relay has been received in the same cali-
brated condition as it left the factory. They will
insure that set-up procedures such as removing
contact blocking has been accomplished. A re-
ceiving acceptance check should include the
following steps:
1. Perform all of the mechanical and electrical
tests listed in the receiving acceptance section
of the applicable I.L., include the maximum
torque angle test, even if it is not called for
in some
I.L.‘s.
2. Follow the appropriate test procedures outlined in
I.L.‘s covering the K-DAR FIELD TEST UNIT.
It is suggested that all dial test readings in each test
be recorded for future reference. This information
3.
will be very helpful in recognizing possible drift of
electrical characteristics.
If the settings to be applied to the relay when it is
installed are known, the relay should be set to
these settings and checked with the field test units
as noted in step 2 above. A record
for future refer-
ence should be taken. The relay test values using
the KDAR test unit should check to be within 2 7
percent of the relay settings.
ROUTINE MAINTENANCE
The relay should be checked periodically at
time intervals dictated by previous experience
and practices.Westinghouse recommends that
the time interval between checks be a maximum
of two years. Routine maintenance should include
at
1.
2.
3.
leas; the following steps:
Repeat step 2 or 3 under Receiving Acceptance
and record test results.
Compare test results with previous results. If
any test values deviate from previous checks
by more than
&5 percent, recheck relay per-
formance in line with the receiving acceptance
checks outlined above step 1.
Retain records of test results on each particular
relay. During each routine maintenance, the
records should be analyzed to determine if
there is any evidence of drift; i.e., continued
change in characteristic in the same direction.
Evidence of drift should be traced to the parti-
cular element involved, usually a capacitor or
resistor and this element replaced.
All possible contingencies which may arise during installation, operation or maintenance, and all details
and variations of this equipment do not purport to be covered by these instructions. ff further information
is desired by purchaser regarding this particular installation, operation or maintenance of this equipment,
the local ABB Power T&D Company Inc. representative should be contacted.
Printed in U.S.A

4. Some of the more common component pro-
blems may be detected as follows:
With the relay mounted on a panel and energ-
ized by station C.
T.‘s & P. T.‘s, open all
trip circuits and all current switch positions
12, 13, 14, 16, 17, 18, 19, and, phase C voltage
switches (terminal 9) and if applicable an
additional switch position on the
separately-
energized
38 unit. Check the internal schematic
for your particular relay. Jumper terminal 7
to terminal 9 and to any other applicable switch
normally connected to phase C, on the relay
side (upper half of the switch). The contacts
of both operating units should stay open. If
the
3-phase unit contact closes, it indicates
misadjustment -of resistor, R3A, or potentio-
meter,
P3A (most common cause), or a de-
fective capacitor,
C3C, follow the instructions
for troubleshooting in Section E for KD-4 and
KD-5 relays and the proper instruction leaflet
for KD, KD-1, and KD-10 and KD-11 relays.
If phase-to-phase unit closes, recheck for:
KD & KD-1 relays
RMA & RMC-Calibration
KD-4, KD-5, &
KD-41 relay RAC-Calibration
KD-10
& KD-11 XLAC-Adjustment
CALIBRATION AND TROUBLE
SHOOTING HINTS:
A. Experience has shown that calibration of the
relay for maximum torque angle is the pro-
cedure most
suscetible to error. Two poten-
tial sources of error are most common:
1. Instrumentation errors
- Be sure of the
accuracy of calibration of all instruments
and phase shifters used. Instruments should
be chosen and ranges selected so that
readings are taken with the instrument
reading in the top third of the scale.
When a phase shifter is used, attention
should be paid to the fact that voltage
and current settings will change as the
angle is varied. To avoid inaccuracies due
to this effect, check the voltage and current
settings when contact operation indicates
that maximum torque angle check point
has been reached.
2. Failure or miscalibration of components not
connected with angle adjustment to distin-
guish between the two sources of error it is re-
commended to perform compensator nulling
test as follows:
B. For KD-4, 41, 5, 10, and 11 relays
Phase-to-phase unit (TAB and TBC
compensators) Maximum Sensitivity Angle
1.
2.
3.
4.
5.
Use “PH-PH-1-2 Phase Test” - connec-
tion for TAB-compensator, and
“PH-PH-
2-3” Test connection for TBC compen-
sator. Refer to the figure in the I.L. titled
“Test Connections.”
Measure voltage across
C2A for TAB and
across
C2C for TBC.
Set current equal to:
VlF2F
RELAY SETTING
The current should be high enough to pro-
vide an accurate phase angle meter reading,
or any convenient value if a phase-shifter
is used for direct angle reading.
Set the phase shifter for the desired maxi-
mum torque angle value.
Note the voltage.
Vary the phase angle in both directions of
the set value, to see that a low voltage
(below 1 volt) is obtained at the maximum
torque angle setting. If within +2 degrees,
it can be left undisturbed. If the minimum
voltage is obtained at some other angle,
readjust phase shifting resistor or potentio-
meter at the desired angle.
C. For KD and KD-1 Relays
Follow procedure above except:
1. For Ta compensator, use connection #2
omit voltage connection to terminal 9, dis-
connect LA-lead, insert voltmeter to mea-
sure open circuit voltage and use twice
the current value obtained for KD-10 tests.
Follow procedure outlined above except
adjust
R2A when required. _

I.L. 41498.5
D.
E.
2.
3.
For TR compensator, use procedure out-
lined above, except use
#3 connection and
adjust
R2R when required.
For
TC compensator, use connection #4,
omit voltage connection to terminal 7,
disconnect LC-lead, and adjust
R2C when
required as per Part I.
Three-phase unit (T compensator) of all KD
type relays:
1.
2.
3.
4.
5.
Use connection #l.
Measure VOltage across C3A
Set the current equal to:
V1F2F
1.5 Relay Setting
The current should be high enough to pro-
vide an accurate phase angle meter reading,
or any convenient value if a phase-shifter
is used for direct angle reading.
Set the phase-shifter for the desired maxi-
mum torque angle value.
Note the voltage.
Vary phase angle in both directions of the
set value, to see that a low voltage (below
1 volt) is obtained at the maximum torque
angle setting. If minimum voltage is with-
in
+2 degrees, do not readjust. If the mini-
mum voltage is obtained at some other angle
readjust phase-shifting resistor or potentio-
meter at the desired angle.
Suggested Procedure for Detecting and
Replacing Defective C3C Capacitor
For KD-4, KD-5 and KD-10 Relays
Step 1
Set S =1 for the 3-phase unit.
Apply approximately 120 volts to relay terminal 7
and 8 and short out terminals 7 and 9 (for KD-5
between terminals 6 and 9 and some short reach
KD-4).
If contacts of the 3-phase unit close, then, the
C3C capacitor is under suspicion but im-
properly adjusted
R3A can be suspected, as
well.
Step 2
Remove the connections made in Step 1.
Apply approximately 120 volts (i.e., 100-130
volts) to: terminals 8 and 9 =
Vg9.
Measure the voltage across the C3C capacitor
with a high impedance voltmeter
- 5000
OHMS/volt.
For
.75-20 OHM reach KD-4 relays, the
minimum_
.voltage should be Vmin = 3.72 x
Vg9. If Vmin less than 3.72 x Vg9 replace
capacitor
C3C.
For .24.35 OHM reach KD4 and KD-5
relays, the minimum voltage should be Vmin
= 2.82 x
Vg9 if Vmin less than 2.82 x Vg9,
replace capacitor C3C.
For all ranges KD-10 use same procedure as for
.75-20 OHM reach.
Step 3
Relays which fail either step 1, or have C3C
capacitor replaced after failing step 2, or
after
C3A capacitor iS replaced, require
readjustment of R3A or P3A. Repeat step 1 and
adjust
R3A or P3A so that contacts jUSt open.
Measure total R3F and R3A resistance
Omit this procedure for KD- 10 relays.
a) for .75-20 OHM reach KD-4 relays
l when the relay is preheated as per I.L.,
decrease
R3A setting by 10% of total
R3F and R3A resistance.
or l for a cold rela
R3A so that t h
repeat step 1 and adjust
e contact just opens. No
further adjustment is required.
b) for .2-4.35 OHM reach KD-4 relays with
sub “A” in the style number
l for a cold relay, decrease R3A setting
8% of total R3A + R3F resistance.
l for a hot relay, decrease R3A setting
8% of total R3A + R3F resistance.
3

c) for .2-4.35 OHM relays without sub “A”
in style number
l for a cold relay, decreases R3A setting
7% of total R3A + R31z resistance.
l for a hot relay, decrease R3A setting
4% of total
R3A + R~F reSiStanCe.
NOTE: R3A range of adjustment may occasion-
ally be insufficient. If so, set R~F for
maximum resistance, or replace
R~F
resistor with higher value.
d) For KD-10 follow instruction leaflet to ad-
jUSt R~A OI- P3A.
F)
G.
Suggested procedure for C3C for KD-1, KD-41,
KD-11 relays.
4
b)
No voltage test is required across the C3C
capacitor.
If C3C has been found bad (shorted or
leaky) repeat
P3A or R3A adjustment
above.
Suggested Procedure for Replacement of
CzC,
C~A Capacitors
After the capacitors have been replaced:
a>
b)
Open relay switch 9 (phase C potential).
short terminals 7 & 9 on relay side and apply
approximately 120 volts to terminals 7 and
8.
c)
4
e)
adjust RCA resistor for KD-4-41 relays
and
XIAC for KD-10-11 relays so contact
just floats
-
favoring contact opening
direction.
if desired, repeat 2.5 volts calibration point.
for KD & KD-1 relays, follow procedure
for RMA
& RMC calibration.
ABB Network Partner
ABB Power T&D Company Inc.
4300 Coral Ridge Drive
Coral Springs Florida 33065
[phone]
FAX: [phone]
-
Printed in USA