I 1
I i
Megger"
The
DDA
Series
offers
high
capacity
in
a
single,
relatively
compad
enclosure
that
can
be
easily
maneuvered.
.1.
When
testing a circuit breaker
or
a device
which
has
no
auxiliary contact to monitor (e.g., a single-pole circuit
breaker),
the
timer starts
when
the
output
current starts
to
flow
and
stops
when
the
output
current is interrupted.
2.
When
testing a device
and
monitoring normally closed
contacts,
the
timer starts
when
the
output
current starts
to
flow
and
stops
when
the
contacts
open.
3.
When
testing a device
and
monitoring normally
open
contacts,
the
timer starts
when
the
output
current starts
to
flow
and
stops
when
the
contacts close.
Digital
voltmeter:
Model DDA-l
can
be
used
to
measure
the
input
voltage
to
the
test set
or
the
output
voltage from
the
test set.
It
also
can
be
used
as a diagnostic tool
to
evaluate contact condition
by
measuring the voltage
drop
across
breaker
contacts while subject
to
high current.
Panel indicators: Panel lamps incorporated for
operator
safety
and
convenience, indicate:
1.
Output
of
the
set ENERGIZED
2.
Thermal
WARNING
or
SHUIDOWN
3.
GROUND INTERLOCK
open
4.
OVER
RANGE
of
ammeter
External initiate circuit: Allows initiation
of
the test
set
from a
remote
location
when
desired.
SPECIFICATIONS
Input
Because Model DDA-3000/-6000 is
used
all over
the
world
to
test
low-voltage circuit breakers, there are a
number
of
test sets
designed
to
contend
with
the
many
different input voltages
and
frequencies.
When
ordering, select
the
test set which best suits
the
power
system available.
The
standard input
power
requirements for
the
DDA-3000
and
DDA-6000 series are as follows:
Output
Output
Circuit:
The
output
of
the
test set is easily adjustable from
zero
to
the
maximum
current available through
the
impedance
of
the
device
under
test.
Two
output
ranges are provided
to
accommodate
a variety
of
load
circuit impedances.
For
high
impedance
devices,
the
output
can
be
connected
in
DDA-3000
and
DDA-6000
Universal
Circuit
Breaker
Test
Sets
Output
Current
Maximum
Continuous
Current
Maximum
Current
Maximum Current
Through
a
Through
a
Short
Circuit
Breaker
Circuit
4500
A
35,000
A
60,000 A
4446
A
2S,OOOA
48,000
A
4446
A
2S,OOOA
48,000
A
DOA6000.
6250
A
60,000
A
100,000 A
6175 A
50,000
A
SO,OOOA
:ODA-.600:?
6175A
50,000
A
SO,OOOA
··;M~d~
..
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____
D_I_M_E_NTS_I_O_N_S
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--I
'~'''
..•. ',.,
Ib
kg
H X W X D
(in.)
H X W X D
(em)
PR);;-'3QOOS¢t!¢S1000 454
46X46X28in.
117X117X71em
DDA~600(rs~i,~f
1200 545 46 X 55 X 28 in. 117 X 140 X
71
em
'.-
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,,~~
.
.'.
-;
.yo:.:.:':
,,:-,-,.
series (with the series
bar
provided)
to
double
the
output
voltage
at a
reduced
maximum current.
The maximum current available from
the
test
set
is determined
primarily
by
the impedance
of
the
load
circuit.
The duration
of
the available current is determined primarily
by
thermal conditions within
the
test set.
Output
Connections:
To provide
maximum
utilization
of
the
output
available from
the
test set,
each
set
is
equipped
with a
Megger stab
adapter
board
and
stab
sets Model
CBS-1
and
Model
CBS-2
for
use
with drawout style, metal-clad breakers. The stabs
eliminate the significant losses that
occur
if leads are
used
to
connect
the
breaker
under
test to
the
test set. Cables must
be
used
when
testing molded-case
breakers
or
other
devices which
will
not
connect directly
to
the
stabs.
Duty
Cycle:
The
test
set
will
supply
the
rated continuous current
indicated for 30 minutes, followed
by
30 minutes off.
Maximum
Output
Current:
Model DDA-3000/-6000 Series will
produce
the
following outputs
at
rated
input
voltage:
Instrumentation
Digital
Ammeter
Operating
Mode
Memory
Continuous
Digital
Display:
5-digit display
with
0.281 in.
C7
mm) numerals
Ranges:
200/2000/20,000/200,000 A
Overall
Ammeter
System
Accuracy
Continuous ±1%
of
reading
Peak Pulse
±2%
of
reading
RMS
Pulse ±1.5%
of
reading
Digital
Timer
Digital
Display:
5-digit display
with
0.281 in.
C7
mm) numerals
Ranges
0.0001
to
99999 seconds
0.0001
to
99999 cycles
Accuracy:
± 1 %
of
reading
Digital
Voltmeter
Operating
Mode
Input
voltage
Output voltage
External voltage
Digital
Display:
5-digit display
with
0.281 in. (7
mm)
numerals
Ranges:
0
to
600 V
Accuracy:
±
1%
of
reading
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