TYPE HQS RELAY
If
the two helical springs which reset the
aramture are replaced by new springs, they
should be
weakened slightly to stretching to
obtain the 1
ampere calibration. The coil
resistance is approximately 0.16 ohm.
Three - Phase Negative Sequence Filter
The filter is adjusted for balance at the
factory and no further adjustments or mainte
nance should be required. With balanced three
phase currents of 10 amperes, 60 cycles, phase
rotation A,
B,
C, introduced into the input
terminals as marked on Fig. 2, the voltage be
tween the output
terminals A', B',
and C',
should be zero. Use a high resistance volt
meter for this chec;,.
Connect
terminals A',
B',
and C' to termi
nals 20,
22 and 24 of
the type HQS relay.
Connect the relay terminals 19, 21 and 23 to-
14/l
gether,
With balanced three-phase currents of
5
amperes, 60 cycles, phase rotation A, B, C,
applied to the filter input terminals A, B, C,
and the
neutral made by connecting terminals
A",
B"
and C"
together,
the voltage across
tke relay terminals 19 and 20, 21 and 22, and
23 and 24 should be
zero.
Now, reverse the
connections to the filter input terminals A
and B and check the voltage now appearing
across the relay terminals.
These three volt
ages should be substantially 0.7 volt.
RENEWAL PARTS
Repair work can be done most satisfactorily
at
the factory.
However,
interchangeable
parts can be
furnished to the customers who
are
equipped for doing
repair work.
When
ordering parts, always give the complete name
plate data.
6
.leJ0-.32 -!>CREW.S
FOR TERMIAIAW
if
D/.11, MT4. HOLES
(4-HOLES)
Fig. 3-0utline and Drilling Plan of the Three Phase Negative Sequence Filter.
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