Atec DDA-1600 User Manual

DDA-1600

Circuit Breaker Test Set

■

Model DDA-1 Digital Data Acquisition
Instrumentation and Control System

■

Variable pulse time and firing-angle
output current control

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Tests wide range of breakers

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Modular, portable design

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Compliant with NEMA AB-4 test
guidelines

DDA-1600

Circuit Breaker Test Set

DESCRIPTION

The Model DDA-1600 Circuit Breaker Test Set incorporates
proven transformer design with the latest development in
high-current instrumentation and control. This new design
means the DDA-1600 is fully compliant with NEMA AB-4
test guidelines.

This combination provides the user with a portable,
economical, high-current source for primary injection
testing.

Model DDA-1600 provides all the controls, instrumentation
and output capabilities to test low-voltage circuit breakers
in a three-module configuration.

Module 1 – Controller and instrumentation module
contains all the control circuitry and instrumentation
needed for manually testing low-voltage circuit breakers.

Module 2 – Power module contains the coarse and fine­current controls, along with the SCR initiate package.

Module 3 – Output module contains the high-current
output transformer and the current sensors.

Model DDA-1600 comes complete with all interconnect
cables. Each module is housed in its own rugged, compact
enclosure. The test set is easily transported and may be
connected to the test device by cables or stab assemblies.

APPLICATIONS

Ideally suited for industrial, utility and testing service
company use, Model DDA-1600 is designed to maintain
and test low-voltage power circuit breakers rated to 1600­ampere frame size.

In addition, it can be used for verifying the ratio of current
transformers and testing thermal or magnetic motor
overload relays.

In the series configuration, the higher voltage output of
Model DDA-1600 permits ready use in substations for
primary injection testing of high-voltage circuit breakers
and protective relays.

FEATURES AND BENEFITS

Model DDA-1600

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Portable: Housed in a lightweight, rugged, three-piece
chassis that can be carried. This reduces the need for
heavy equipment to transport the test set.

■

Versatile: Designed to test a wide range of air frame and
molded-case circuit breakers. Model DDA-1600 will test
airframe circuit breakers rated up to 1600 amperes and
molded-case circuit breakers rated up to 1200 amperes.

■

Initiating control circuit: Fully digital initiating
control circuit provides both pulsed and maintained
control modes of output duration.

The pulsed mode automatically pulses the output to any
programmed pulse duration. This provides additional
testing capabilities for electromechanical and solid-state
trip devices. A short pulse duration also limits the
preheating of the breaker under test while setting the
test current.

In the maintained mode, the output remains energized
until the device under test operates, which both stops
the timer and de-energizes the output.

DDA-1600

Circuit Breaker Test Set

■

Zero dc offset: Use of digitally controlled SCRs instead
of a contactor to initiate the output of the test set
eliminates closing-time error and ensures precise
initiation at of the output current waveform every time.

Accurate, repeatable test results are ensured even with
currents of very short duration, as when conducting tests
of instantaneous or short-time delay trip elements.

The digital control of the SCRs also allows the unit to
initiate at any point within 90 degrees of the zero
crossover point of the output-current waveform. This will
allow the elimination of a the dc offset caused by a
change in impedance of the varying loads.

Controller and Instrumentation

Module

Model DDA-1: The Digital Data Acquisition
Instrumentation and Control system was designed
specifically to provide precise control of the output current
and accurate metering of the breaker under test. Model
DDA-1 uses the latest in Digital Signal Processing (DSP)
technology. This technology provides complete digital
control of the SCRs and digitally samples the output
current for high-accuracy measurements.

Digital ammeter: Model DDA-1 samples the output
current digitally and mathematically calculates the current
that is supplied to the breaker under test.

This process increases the accuracy of the ammeter
systems and provides extreme flexibility in what current
value is displayed. For example, when the test set is
delivering a continuous current, the digital ammeter is
continuously sampling the output waveform and can
therefore display a true rms value of the current.

For measuring short-duration currents, Model DDA-1 can
calculate the output current in the following ways via
selection from the soft control buttons on the panel:

1.For any output current greater than one cycle, Model
DDA-1 can calculate the true rms value of the output
current pulse. For any output less than one cycle, a true
rms measurement is invalid.

2.For any current pulse, Model DDA-1 can measure the
peak current and calculate an anticipated rms value of
the current from the peak current.

This multiple-current calculation feature is also useful
when testing different styles of solid-state trip devices. This
feature allows the test set to simulate a similar type of
current calculation that is being used by the various solid­state trip devices.

Digital timer: Because of the Model DDA-1 digital signal
processing technology, the system knows exactly when
current is present and when the breaker under test opens.

This provides a high-accuracy timing even when testing
the instantaneous trip function on fast-acting breakers. The
digital timer can display the breaker trip time in cycles or
seconds.

A completely digital, solid-state circuit automatically starts
the timer when the output current starts to flow and stops
it when the device under test operates. This circuit will
accommodate a variety of test conditions including:

1.When testing a circuit breaker or a device which has no
auxiliary contact to monitor (each as 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-1 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 SHUTDOWN

3. GROUND INTERLOCK open

4. OVER RANGE of ammeter

External initiate circuit: allows initiation of the test set
from a remote location when desired.

Model DDA-1600 uses the Model DDA-1 Digital Data Acquisition Instrumentation and Control System. This system offers the latest in digital signal
processing technology to control the test set and measure reactions of the breaker under test.

DDA-1600

Circuit Breaker Test Set

SPECIFICATIONS

Input

Other input voltages are available with an optional input
autotransformer, Model AT-5: 208/240/575 V, 1.

(Refer to the Optional Accessories section.)

Digital Timer

Digital Display: 5-digit display with 0.281 in. (7 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

Digital Display: 5-digit display with 0.281 in. (7 mm) numerals
Ranges

Up to 600 V

Accuracy

±1% of reading

OPTIONAL ACCESSORIES

Model AT-5 Input
Autotransformer

If nameplate input voltage is not available, or if Model DDA-1600
is to be used at various locations with different input voltages,
specify Model AT-5 Input Autotransformer.
The multitapped autotransformer with power ON/OFF switch and
appropriate sockets and plugs is housed in a rugged, sheet-metal
enclosure with casters and handles.
Model DDA-1600 is designed to be placed on top of Model AT-5,
providing a compact, transportable system. Model AT-5 tap
selections are: 208, 240 and 575 volts, 60Hertz, single-phase. For
other input voltage and frequency, contact Technical Sales.
Model AT-5 may reduce the maximum output of the test set. For
example, a 208-volt input, stepped up to 460 volts, may not be
sufficient to provide maximum output.

Transport Cart

The transport cart is a mobile base that supports Model
DDA-1600. This allows the test set to be rolled from one
test site to another.

Stab Adapter

To obtain the maximum output current of the unit, the
appropriate stab adapter connects the output bus of Model
DDA-1600 in a parallel configuration while providing an output
base for stab set Models CBS-1, CBS-2 or CBS-3. The Model
DDA-1600 test set uses Stab Adapter Model CBS-7.
Refer to the catalog entry for Circuit Breaker Stab Sets to
determine the proper stab set selection.

Model No. Input Voltage

(single phase)

Input

Frequency

Input

Current

DDA-1600/50

DDA-1600 460 V ± 5%

380 V ± 5%

60 Hz

50 Hz

150 A

150 A

Model No.

Maximum

Continuous

Current

Maximum Current
Through Air-Frame

Circuit Breaker

Maximum Current

Through Molded-Case

Circuit Breaker

DDA-1600/50

DDA-1600

1,600 A

1,580 A

19,200 A

16,000 A

14,400 A

12,000 A

Output Current

Output

The output of the test set is easily adjustable from zero to the
maximum current available through the impedance of the device
under test. For low-current, high impedance devices, the output
can be connected in series with the optional series bar to double
the output voltage.

Model DDA-1600 will deliver the rated continuous current for a
24 hour period.
The maximum current available from the test set is determined
primarily by the test-circuit impedance. The duration of the
available current is determined by the thermal conditions within
the test set.
The maximum current through an air frame circuit breaker is the
maximum current the test set can deliver through a breaker
connected with stabs.
The maximum current through a molded-case circuit breaker is
the maximum current the test set can deliver through a breaker
connected with 5 ft (1.5m) cables provided.

Instrumentation
Digital Ammeter

Operating Mode

Memory
Continuous

Digital Display: 5-digit display with 0.281 in. (7 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

Model No. Module

Weight Dimensions

Power
Output

DDA-1600

lb

19
100
210

kg

8.6

45.4

95.4

H x W x D (in.)

9.9 x 14.1 x 11.3
14 x 29 x 12.5

7.5 x 33 x 18

H x W x D (cm)

27 x 54 x 24.8

35.6 x 73.6 x 31.8
19 x 83.8 x 45.7

Control and

Instrumentation

DDA-1600

Circuit Breaker Test Set

Item (Qty) Cat. No.

Model DDA-1600 DDA-1600
Model DDA-1600/50 DDA-1600/50

Included Accessories

Input leads, 15 ft (4.5 m), 4AWG, [2] 17165
Ground lead, 8 in. (45.7 cm) [1] 15067
Timer leads,12 ft (3.7 mm) [2] 2997
Output leads, quadruple 4/0, 5 ft. (1.5 m) [1 set] 15397

Signal cable interconnect [1] 17413
Control cable interconnect [1] 17435
Power interconnect [1] 14783

Fuses

1.5 A, 250 V MDL [5] 11898
3 A, 250 V MDA [5] 951

0.5 A, 250 V MDL [5] 982
2 A, 250 V MDA [5] 983

1.6 A, 500 V FLQ [5] 15533

ORDERING INFORMATION

Item (Qty) Cat. No.

Instruction manual [1] 50550

Optional Accessories

Model AT-5 Autotransformer AT-5
Stab adapter CBS-7
Optional stab sets CBS-1, CBS-2
Transport cart 11685
Series bar CBS-8
Model CBS-3 stabs Contact Technical Sales

UK

Archcliffe Road Dover
CT17 9EN England
T [phone]
F [phone]

UNITED STATES

4271 Bronze Way
Dallas TX75237-1088 USA
T 800 723 2861 (USA only)
T [phone]
F [phone]

OTHER TECHNICAL SALES OFFICES

Valley Forge USA, Toronto CANADA,
Mumbai INDIA, Trappes FRANCE,
Sydney AUSTRALIA, Madrid SPAIN
and the Kingdom of BAHRAIN.

Registered to ISO 9001:2000 Reg no. Q 09290
Registered to ISO 14001 Reg no. EMS 61597

DDA1600_DS_en_V10

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