Table of Contents
Advertisement
KLF-1 Loss-of-Field Relay
should jump from 0 to the rated voltage after
a time delay of 0.4 ± 10% seconds. A trimpot
on the PC board can be adjusted to obtain
the desired time delay from 0.03 to 0.5 sec-
onds.
H. Compensator Check
Accuracy of the mutual impedance T of the com-
pensators is set within very close tolerances at
factory and should not be changed under normal
conditions. The mutual impedance of the com-
pensators can be checked with accurate instru-
ments by the procedure outlined below:
1. Set
T
on the 15.8 tap
A
T
on the 5.1 tap
C
2. Disconnect the L-leads of sections M
M
.
C
3. Pass 10 amperes ac current in terminal 9
and out of terminal 8.
4. Measure the compensator voltage with an
accurate high resistance voltmeter (5000
ohms/volt).
5. Compensator A-voltage should be checked
between lead L
a. For T
should be 158 volts ± 3%.
6. Compensator C voltage should be checked
between lead L
reactor (X
a. For T
volts ( ± 3%).
7. For all other taps the compensator voltage is
IT ( ± 3%).
where I = relay current
and
A
11.0 RENEWAL PARTS
Repair work can be done most satisfactorily at the
factory. However, interchangeable parts can be fur-
nished to the customers who are equipped for doing
repair work. When ordering parts, always give the
complete nameplate data.
41-748.31B
and terminal 5.
A
= 15.8 the voltage measured
A
and the front terminal of the
C
).
D
= 5.1, the voltage should be 51
C
T = tap setting.
19
Advertisement
Table of Contents
