Eaton Cutler-Hammer Digitrip RMS 510 - Page 32

AD 33-855-4
Page 31
SECTION
8
TESTING
RETROFITTED
BREAKERS
8.1
Dielectric
and
Meggar
Testing
REFER
TO SECTION
1,
ENTITLED
"GENERAL
INFORMATION
AND
SAFETY
PRECAUTIONS",
AND
REVIEW
ALL
THE DIRECTIONS
SET
FORTH
IN THAT
SECTION
PRIOR
TO STARTING
ANY
TESTING
PROCEDURE.
FAILURE
TO
FOLLOW
THE SAFE
PRACTICES
RECOM-
MENDED
IN
SECTION
1 GOULD
RESULT IN
PERSONAL
INJURY
DEATH,
AND
/ OR
EQUIP-
MENT
DAMAGE.
TESTING
SHOULD
ONLY
BE
CARRIED
OUT BY
PERSONNEL
FAMILIAR
WITH
THE HAZARDS
ASSOCIATED
WITH
WORKING
ON
POWER CIRCUIT
BREAKEFS
AND SWITCHGEAR
ASSEMBLIES.
I
crurroru
TO AVOID
POSSIBLE
DAMAGE
TO THE
TRIP
UNIT,
PERFORM
THE
FOLLOWING
TWO STEPS
BEFORE
APPLYING
MORE
THAN
6@
VOLTS TO
A BREAKER
RETROFITTED
WITH A
DIGITRIP
RMS
TRIP
SYSTEM.
1. Disconnect
the
white
plug
from
the
Potential
Transformer
(PT)
Module.
This
action
disconnects
the
Breaker
Primary
Voltage
from the
Trip Unit
(RMS
81O,
910,
and
OPTIM).
2. For
kits
with a Breaker
Mounted Control
Power
Transformer
(CPT),
disconnect
it
from
the
Breaker by
removing
the two
in-
line
fuses
from
the system
voltage
wires.
8.2
Trip System
Testing
-
General
Notes
Each
Retrofitted
Breaker
must be
tested using
the
Primary
lnjection
method
to confirm
the
entire
system
operation
(including
Sensors)
prior
to installation.
Use
the test
settings
shown
in Table
8-1
.
Once
the Breaker
has
been
tested using
the
Primary
lnjection
method,
the Self-Test
or
the
Secondary
lnjection
method
may be used
for
subsequent
preventative
maintenance
testing.
lf
you
wish
to test
the Trip
Unit at
the
customer's
settings,
then we suggest
using
Cutler-Hammers
Digitest software
program,
which
will facilitate
any
combination
of
settings.
Please call
Cutler-Hammer
at
1-800-937-5487
for
more information
on
the
Digitest
program.
Each
Retrofitted
Breaker
must be
set up
per
the
distribution
system
coordination
study
prior
to
installation.
C. Digitrip
Trip Units are
calibrated,
sealed
at
the
faciory,
and are
not
repairable.
Field testing
of
the
Retrofit
Kits confirms
that
the Retrofitted
Breaker
meets the
published
Time-Current
Curves
shown
in Figures
3-2, 3-3,
and 3-4.
Each
pick-up
or time
setting
on Digitrip
Trip
Units
is selected
by
choosing
one
position
of
eight on
each switch.
However,
the Discriminator
function
has
an eight
position "On / Off" switch.
Positions
one through
seven
(1
-7)
are
"On" while
position
eight
(8)
is
"Off " for the
Discriminator
function.
Each
switch
setting
has a
tolerance band
associ-
ated
with
it as defined
in the Figures
3-2,3-3,
and
3-4.
B.
Ftfective I /01
ElT.il