Megger ODEN AT/3X Primary Current Injection Test System

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Megger ODEN AT/3X
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ODEN AT/3X Datasheet
The Megger ODEN AT/3X is a powerful test system 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 short duration 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.
Megger ODEN AT/3X Features
  • 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
Megger ODEN AT/3X Specs
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.


The instrument is intended for use in high-voltage substations and industrial environments.

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

The output transformer has a built-in thermal cut-out, and the primary side is protected by a miniature circuit breaker.

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)
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
Phase angle
Range 0 – 359°
Inaccuracy ±2° (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.