Megger/HDW/SebaKMT OWTS M28, 28 kV Partial Discharge Analyzer

Megger/HDW OWTS M 28 Partial Discharge Test and Fault Location System
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The Megger/HDW/SebaKMT OWTS M28, 28 kV Partial Discharge Analyzer is used to identify, evaluate and locate partial discharge (PD) faults in a cable insulation and accessories in all types of medium voltage cables.

The system consists of a notebook as a WLAN control unit and a HV unit. The HV unit contains a HV source and a resonance inductor with an integrated electronic switch to generate the AC test voltage. The HV divider and an embedded controller for the digital data acquisition and partial discharge signal processing is integrated. The storage, analysis and evaluation of the partial discharge signals takes place in the notebook and can be done either on site or in the office. The partial discharge fault location is based on the time domain refl ection method.

For the partial discharge diagnosis the test object is charged to the preselected peak value by a HV source within a couple of seconds and afterwards shorted with an electronic switch via a resonance coil. Thus a sinusoidal oscillating AC voltage with low damping is created (DAC). The frequency is fixed in a range from 50 Hz to several 100 Hz, depending on the capacitance of the test object.


  • Partial discharge diagnosis by means of damped AC voltage (DAC)
  • Partial discharge level measurement according to IEC 60270
  • Automatic adjustment of the bandwidth of the measurement circuit for optimised signal detection
  • Automatic calibration mode with joint location feature
  • PC with WIN XP and WLAN for system control
  • Statistical partial discharge fault acquisition, online processing
  • Menu-driven unit to operate the test sequence
  • Portable design, low weight, easy set-up on-site
  • Online processing for complex partial discharge-Diagnosis
  • Integrated tan δ - measurement


Max. DAC outputvoltage 28 kVpeak / 20 kVrms
DAC frequency range 50 Hz … 800 Hz
Capacitance range 0,025 μF … 2 μF
HV charging current 10 mA
Partial discharge measuring range 1 pC … 100 nC
Partial discharge level detection acc. to IEC 60270
Bandwidth for partial discharge localization 150 kHz … 45 MHz
Dissipation factor tan δ 0,1 % … 10 %