Atec HDW-OWTS-HV150 User Manual

SebaKMT · Dr.-Herbert-Iann-Str. 6 · 96148 Baunach/Germany · Tel. [phone] - 6 80
Fax [phone] - 22 73 · [e-mail] · www.sebakmt.com

ISO 9001:2000

OWTS HV 150

Partial Discharge Diagnosis
System for HV Cables up to 150 kV

Benefits

Non-destructive testing and diagnosis using

damped AC voltages

Advanced PD detection and PD site

localisation
Integrated dielectric losses - measurement
Portable test system, compact design and

low weight
Real-time analysis and reporting using

Explorer software

Technical data subject to change without notice.
LFT_OWTS HV 150_eng_2007_18

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Description

The oscillating wave test system (OWTS) is used to identify,
evaluate and locate partial discharge (PD) faults in cable
insulation and accessories in all types of high voltage power
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 damped AC test voltage. The HV divider and the
coupling capacitor are integrated in a separate unit together
with the embedded controller for the digital data acquisition
and PD signal processing.
The storage, analysis and evaluation of the PD signals takes
place in the notebook and can be done either on site or in the
office. The PD fault location is based on the time domain
reflection 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 150kV
switch via a resonance coil. Thus a sinusoidal damping AC
voltage with low damping is created (DAC). Depending on the
capacitance of the test object the AC frequency varies in the
range from tens to hundreds of Hz.
Since the DAC frequency of the test voltage is close to
nominal AC service conditions all measured PD activities can
be effectively evaluated.
The PD inception voltage (PDIV), PD extinction voltage (PDEV)
and the dielectric losses value can be easily determined due
to the decaying amplitude of the test voltage. Critical PD levels
responsible for the insulation degradation status of the cable
insulation are 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.

Features

PD diagnosis by means of damped AC voltage (DAC)
PD level measurement according to IEC 60270
Adjustment features to optimize detection sensitivity
Automatic calibration mode with joint location feature
PC with WIN XP and WLAN for system control
Real-time data processing
Menu-driven unit to operate the test sequence
Portable design, low weight, easy set-up on-site

Technical Data

Max. DAC output voltage 150 kVpeak / 106 kVrms
DAC frequency range 20 Hz … 500 Hz
Capacitance range 0.025 µF … 13 µF
HV charging current 10 mA

PD measuring range 1 pC … 100 nC

PD level detection acc. to IEC 60270
Bandwidth for PD-

localisation

150 kHz … 45 MHz

Dissipation factor δ δ

0.1 % … 10 %

Power supply 115 / 230 V, 50 / 60 Hz
Operating temperature -10 °C … +40 °C
Weight app. 300 kg
Components
Unit 1 HV source and LTT switch
Unit 2 (3 coils &basis) Ø: 650 mm, H: 1400 mm
Unit 3 HV divider and DAQ
Unit 4 Notebook app. 2 kg

Scope of delivery

HV unit with HV source, LTT switch and inductive coil with

base unit and three additional modules
HV divider with controller and coupling capacitor
Notebook with WLAN connection to the HV unit
Safety-Box with HV ON/OFF ; Emergency OFF push button

and key switch
Accessory bag
Operating manual
HV connection: Metallic corrugated flexi tube
Set of connection cables
Control cables
OWTS Explorer Package, 2 Dongles, CD-ROM
PD Calibrator