GE STD15C Instructions Manual page 13

C K U P
The
current be different depending upon the UDG
0 . 3 0 1 T a p
course, when
the acceptable as found values being
II 0.30
Example UDG 1 Tap
CURRENT RESTRAINT
The for
the test current values must be modified
12 (DC) 0.80 x UDG 1 Tap
UDG I Tap to 1.10 x
In event a suitable DC meter
be 2.22 if the rectifier back resistance
UDG 1 lap
If DC meter is not available,
RESTRAINT
order to check the
to take into account any difference
I4
of
For any combination of taps,
setting.
Slope
where
smaller tap setting
higher tap setting
differential current
smaller of the two through currents
Courtesy of NationalSwitchgear.com
pickup is as described under the heading INSTALLATION
pickup on a particular service
Tap to 1.10
0.30
YDG
0.90 x 0.30 3.5 to 1.10
0.94 to 1.16 a m p e r e s
harmonic restraint Is as described
1
available. I2 (AC)
0.80 x 3.5 2.8 amperes
0.90 x 3.5 to 1.10 3.5
3.15 to 3.85 amperes
(AC) 2.25 x 2.8
the lead from
is connected to the stud
percent slope is given by the
Pickup value
IO percent
the
UDG I
0.30 3.5
the heading
follows:
2.25
the current values indicated in Table IV must
13 to the test Plug is
to the
of
be determined as
variation Still
TESTS
(DC). (Theoretically
the circuit in
to the stud
tap