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OWTS M 60
Partial discharge Test and Fault
Location System
Benefi ts:
PD Measurement by means of DAC similar
to nominal net frequency
Online processing for complex PD-Diagnosis
Portable test system, compact design and
low weight
Integrated tan δ - measurement
Description
The oscillating wave test system OWTS 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 PD
signal processing is integrated. The storage, analysis and
evaluation of the PD signals takes place in the notebook and
can be done either on site or in the offi ce. The PD fault
location is based on the time domain refl ection method.
For the PD 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 fi xed in a
range from 50 Hz to several 100 Hz, depending on the
capacitance of the test object.
Since the frequency of the test voltage is close to nominal service conditions, all measured PD activities can be effectively
evaluated.
The oscillating voltage energizes the test object only for a few
100 ms and therefore cause no long-term infl uences.
The PD extinction voltage and the tan
determined due to the decaying amplitude of the test voltage.
Critical PD levels responsible for the future status of the cable
insulation are an important criteria in the evaluation.
The analysis and evaluation of the typical PD parameter as
well as the PD fault location supports the Asset Management
for reliable decision criteria for maintenance- or replacement
activities.
δ-value can be easily
Technical Data
Max. DAC outputvoltage
DAC frequency range 50 Hz … 800 Hz
Capacitance range 0.025 µF … 2 µF
HV charging current 7 mA
PD measuring range 1 pC … 100 nC
PD level detection acc. to IEC 60270
Bandwidth for PD-
localisation
Dissipation factor tan δ 0.1 % … 10 %
Power supply 110 … 240 V-AC, 50 … 60 Hz
Operating temperature -10 °C … +40 °C
Weight app. 80 kg
Components
Unit 1 Ø: 650 mm, H: 970 mm
Unit 2 Notebook app. 2 kg
Features
PD diagnosis by means of damped AC voltage (DAC)
PD 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 PD fault acquisition, online processing
Menu-driven unit to operate the test sequence
Portable design, low weight, easy set-up on-site
Scope of delivery
HV unit
Notebook with WL AN connection to the HV unit
Safety-Box with HV ON/OFF; Emergency push button
and key switch
Accessory bag
Operating manual
5 m HV test lead; power supply- and grounding cable
OWTS Explorer package, 2 Dongle CD-ROM
Calibrator
60 kVpeak / 42 kVrms
150 kHz … 45 MHz
SebaKMT · Dr.-Herbert-Iann-Str. 6 · 96148 Baunach/Germany · Tel. +49(0) 95 44 - 6 80
Fax +49(0) 95 44 - 22 73 · sales@sebakmt.com · www.sebakmt.com
ISO 9001:2000
sebaKM T is a regi stered tr adema rk of the sebaKM T group
Technical data subject to change without notice.
LFT_OWTS M 60_eng_2007_05
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