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tt
oc =
� =
where
angle read by phase angle meter in degrees
85°
All other parameters are as defined under equation (2) .
tt
Recommended
angles
equation (2) reduces to:
tt
tt
where:
VT (30)
Note:
If IT is not at least three times the value of the Overcurrent
Supervision setting, a distorted Mho Characteristic may be measured.
4 .
Alternate Test Method for Reach Tests
An alternate method of testing the relay characteristic is shown
in Figure 25 where the R-X test combination is employed.
uses the test box (102L201) , test reactor (6054975) and test resistor
(6158546)
described
s.
resistor-reactor fault impedances are available,
the relay characteristic can be checked.
The
integrating
indicated in Table
POTENTIOMETER
DESIGNATION
LOCATION
Pl
P2
P3
These
potentiometers
adjusted
unless
improper pickup time setting.
6.6 ,
5/6)
time
V
2 X I T X ZR X -cos (
T
=
=
relay base reach angle in degrees
for
testing
=
test voltage at ±30° from angle of maximum
reach
VT should not be greater than 110% of rated voltage.
If VT is greater, reduce IT until VT is correct.
in
GEI-44236.
XV.
timer
(IT)
POTENTIOMETER
FUNCTION
Bottom
Transient
Pickup Time
Top
Steady State
Pickup Time
Middle
Dropout Time
have
a
plot
of
the
setting.
The
GEK-49861
- flf)
1
T
100
oc
are
55°
and
Since
card
has
TABLE XV
60 HZ RELAY
FACTORY SETIING
MILLISECONDS
5.5
4.16
5
been
factory
mho
characteristics
The timer has a 5. 5,
Pl
potentiometer,
22
115°
at
which
The circuit
a
limited
number
only a few points on
three
adjustments
50 HZ RELAY
FACTORY SETTING
MILLISECONDS
6.6
5.0
6
set
and
should
indicates
4/5
(50 hertz
used
for
transient
( 3 )
angles
( 4 )
of
as
-
not
be
an
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