Primary Current Injection Test System
ODEN AT
Primary Current Injection Test System
▪
Most Advanced Primary Current Injection
Test System to simplify all types of
switchgear and CT commissioning, ground
grid, circuit breaker testing and more
▪
Modular design to permit optimal
user configuration of output current
vs. unit size
▪
Compact transport cart facilitates
portability into switchgear rooms
with limited space
▪
Unique I/30 function allows the current to
be pre-set using low current to prevent
test sample heating, thus eliminating
corruption of test result
ODEN AT
Description
This powerful test system is designed for primary injection testing
of protective relay equipment and circuit breakers. It is also used
to test the turns ratio of current transformers and for other
applications that require high variable currents.
The system consists of a control unit together with one, two or
three current units. There are three versions of the current unit: S,
X and H. The S and X current units are identical except that the X
unit has an additional 30/60 V output. The H unit is rated for even
higher current. This makes it possible to configure an ODEN AT
system in a suitable way. All parts are portable, and ODEN AT can
be quickly assembled and connected.
The control unit has many advanced features – a powerful
measurement section for example, that can display turns ratio as
well as time, voltage and current. A second measurement channel
can be used to measure an additional current or voltage. Current
transformer turns ratio, impedance, resistance, power, power
factor (cos φ) and phase angle are calculated and shown in the
display. Current and voltage can be presented as percentages
of nominal value. The fast-acting hold function freezes shortduration readings on the digital display when the voltage or contact
signal arrives at the stop input, the object under test interrupts the
current or injection is stopped
Application
Primary current injection testing and breaker testing
These tests require high currents and the ability to measure very
short duration, current flow. ODEN AT has been designed
especially to meet these needs. No extra contacts are needed to
measure the operating time of a low-voltage breaker. Testing stops
at the instant when the main breaker contacts open to interrupt
the current. Output current initiation is synchronized with the
currents zero-crossover point to ensure good repeatability and
minimized DC offset.
Testing current transformers
For turns ratio testing, the primary current and either the
secondary current or the turns ratio are displayed simultaneously.
Since the turns ratio is displayed directly as the nominal value
(1000/5 for example), no further calculation is needed. Burden of
secondary circuits can be measured and presented in VA.
Polarity testing
The currents phase displacement is shown, and the polarities of
the outputs are clearly marked.
Heat runs
ODEN AT is ideal for performing heat runs. Current can be
applied continuously or through programmable intervals. The
times can be shown in minutes and hours which facilitates longterm testing capability.
Automatic reclosers and sectionalizers
ODEN AT can also be set to test circuit breakers with reclosing
relays. Operating limits, partial times, total times and the number
of operations before lockout can be measured. User-selectable
reclosing sequences can be programmed for testing sectionalizers.
Testing integrity of ground grids and safety-ground devices
One way to test ground grids is by injecting current between a
reference ground and the ground to be tested and measuring the
voltage drop and the percentage of current flowing through the
ground grid. The type X current unit included with ODEN AT
is designed for this type of application. Personal safety grounds
must be tested at rated current, a task for which ODEN AT is well
suited.
Features and Benefits
1. Display. The display presents time, output current, voltage,
current shown on ammeter 2 and phase angle. You can scroll
through entities Z, P, Q, R, X, S, power factor (cos φ) and I
max.
2. Miniature circuit breaker used for current output. Interrupts output current. Can also be actuated manually for safe
disconnection of load.
3. Current reduction button. Used during setting to reduce the
output current to 1/30. Useful in order to avoid for example
unintentional tripping and overheating.
4. Fine adjustment knob. Knob for fine adjustment of current
and +/- buttons for coarse adjustment.
5. Indicator lamps. Indicate whether ammeter 2 or the voltmeter is enabled.
6. Input for voltmeter. Used to measure voltage and for mi-
crohmmeter measurement.
7. Input for ammeter 2. Used to measure current in an external
circuit (in a current transformer´s secondary winding for example).
8. Hold function. This function freezes readings on the display.
9. Selection/setting (CHANGE) knob. Selects the desired
menu option (shown in the display window). Also used to
change numerical values.
10. Setting buttons. Personnel unfamiliar with ODEN AT can
use the pre-defined settings very effectively, while experienced
users can make their own basic settings.
• Ammeter. Used to set the main current-output ammeter. You
can select the desired range or select autoranging.
• V/A Meter. Toggles between the voltmeter and ammeter 2.
Also used to select the desired range or select autoranging.
• System. Used for general settings.
• Memory. Used to save or recall settings to or from the ten
ODEN AT memories. One of these memories contains the default (pre-defined) settings that are invoked when ODEN AT is
powered up.
ODEN AT
Primary Current Injection Test System
• Application. Used to invoke the desired measurement mode:
automatic recloser, sectionalizer or microhmmeter.
ODEN AT can also be set to generate pulse trains with user-selectable pulse and pause times.
11. Injection. Starts current injection and timing.
12. Momentary Injection. When this button is used, injection
continues only as long as it is pressed. Useful in order to avoid
for example overheating.
13. RS232 for computer. ODEN AT is equipped with a serial port
for communication with PC (for transfer of test data for example).
14. Manual shut-off. Injection and timing are stopped when this
button is pressed.
15. Automatic injection stop. Generation stops after a user-spec-
ified interval or when condition at the input is met. The diodes
show the selected OFF condition.
16. Stop-condition indicator. Indicates that a stop condition is
met, voltage or contact triggered.
17. Status indicator. Indicates if a contact connected to the input
is closed or if voltage is present.
18. Stop input. Used to freeze a reading or stop injection. Activat-
ed when current is interrupted by the object being tested, when
an external contact is actuated or when a voltage is applied or
removed.
1
2
3
4
12111098
13 14
5 7
15
6
16 17 18
Specifications ODEN AT
Specifications are valid at nominal input voltage and an ambient
temperature of +25°C, (77°F). Specifications are subject to change
without notice.
System designation
An ODEN AT-system consists of a control unit and one, two or
three current units. There are three different versions of the current
units: S-unit (standard), X-unit (extra 30/60 V outlet) and H-unit
(high current). The system designation indicates the number and
version of current units included.
Example: ODEN AT/2X
2 = Number of current units
X = Version of current unit (S, X or H)
Environment
Application field The instrument is intended for use
in high-voltage substations and
industrial environments.
Temperature
Operating 0°C to +50°C (+32°F to +122°F)
Storage & transport -25°C to +55°C (-13°F to +127°F)
Humidity 5% – 95% RH, non-condensing
CE-marking
LVD 2006/95/EC
EMC 2004/108/EC
General
Mains voltage 240 / 400 V AC, 50 / 60 Hz
480 V AC / 60 Hz
Mains inlet IEC 60309-2, 63 A
Input current Output current x open circuit voltage
/ input voltage
Protection The output transformer has a built-in
thermal cut-out, and the primary
side is protected by a miniature
circuit breaker.
Dimensions
Control unit AT 570 x 310 x 230 mm
(22.4” x 12.2” x 9”)
Current unit S, X H 570 x 310 x 155 mm
(22.4” x 12.2” x 6”)
Complete with cart 690 x 350 x 860 mm
(27.2” x 13.8” x 33.9”)
Weight
Control unit AT 25 kg (55 lbs)
Current unit S 42 kg (92.6 lbs)
Current unit X 45 kg (99.3 lbs)
Current unit H 49 kg (108 lbs)
Cart 11 kg (24.3 lbs)
Display LCD
Available languages English, German, French, Spanish,
Swedish.
ODEN AT
Primary Current Injection Test System
Measurement section
Ammeters
Measurement method AC, true RMS
Inaccuracy 1% of range ±1 digit
Ammeter 1
Ranges 0 – 4800 A / 0 –15 kA
0 – 9600 A / 0 – 30 kA
0 – 960 A / 0 – 3 kA
Ammeter 2
Ranges 0 – 2.000 A / 0 – 20.00 A
Maximum current 20 A (The input is not protected by
a fuse)
Voltmeter
Measurement method AC, true RMS
Ranges 0 – 0.2 V, 0 – 2 V, 0 – 20 V,
0 – 200 V, AUTO
Inaccuracy 1% of range ±1 digit
Input resistance (Rin) 240 kΩ (range 0 – 200 V)
24 kΩ (other ranges)
Dielectric withstand 2.5 kV
Timer
Presentation In seconds, mains frequency cycles
or hours and minutes
Ranges 0.000 – 999.9 s
0 – 9999 cycles
0.001 s – 99 h 59 min
Inaccuracy ±(1 digit + 0.01% of value)
For the stop condition in INT-mode
1 ms shall be added to the specified
measurement error.
Stop input
Max. input voltage 250 V AC / 275 V DC
Phase angle
Range 0 – 359º
Resolution 1º
Inaccuracy ±2º (for voltage and current readings
that are higher than 10% of the
selected range)
Z, P, R, X, S, Q and power factor (cos φ)
For these measurements the result is calculated using U, I and
sometimes φ.
Imax
Stores highest current value that exists ≥100 ms
INT-level
Threshold indicating that current is interrupted. Can be set to
0.7% or 2.1% of Ammeter 1 range.