Atec DDX9121B User Manual

DDX 9121B

Modular Partial Discharge (PD) & Radio Interference Voltage (RIV) Detector

The DDX 9121b is the latest in the DDX family for partial
discharge & radio interference voltage testing. With the
DDX 9121b you can setup, control, test, monitor and
generate test reports from a single computer.

Its modular design makes the DDX9121b flexible for any
application. From single measuring input to simultaneous 9
measuring inputs. From traditional partial discharge
according IEC60270 to RIV measurement or PD under DC.
From pass/fail test to advance phase resolution time
analysis. The DDX9121b includes all you need, and have all
you want.

The DDX 9121B comprises 1 to 9 rack-mounted unit(s)
communicating with a remote PC (not included), which
handles the display of PD information using the DDX
9121b/SWR data acquisition and remote control software.
The software displays test results, generates test reports,
and provides a means to calibrate the system.

Digital filters allow the measurement frequency range to be
at any range into the measuring band to suppress
frequency dependent noise. In addition gating possibilities
allow blanking out stationary interferences.

The reports can then be printed out from the software or
displayed as a web page. With help of the software the
user can also export the results for use in a spreadsheet.
Software also provides bitmaps for inclusion in other
reports.

FEATURES

 User defined measuring band.
 Modular design, 1 to 9 detectors, easily upgradable.
 Embedded switch with four PD inputs per detector.
 Simultaneous RIV and PD reading.
 PD patterns like φ
 High resolution spectrum analyzer with oscilloscope.
 Data acquisition and test report generation.
 AC and DC measuring modes

-q-n

( phase, magnitude, occurrence)

BENEFITS

Reduce your ground noise –The built in frequency

spectrum analysis and selectable frequency band let you
optimize your setup in seconds.

Optimize your investment if your needs change. Unit can

be easily upgraded (RIV, 4 inputs switch, simultaneous PD
readings, PD on DC…)

Reduce your training time –The Windows based software

makes the use of the device easier than ever. Operators can
start using the device in minutes.

Straightforward replacement –replacement is as simple as

removing the obsolete PD detector and measuring
quadripole and installing the DDX9121b.

PD interpretation – The phase resolved analysis and

recording capabilities allow for future data analysis.

Easy to integrate into test systems – Its compact design

standard BNC measuring cables and remote control
capabilities make it ideal for an integrated PD test system
together with an AC power supply.

APPLICATIONS

Testing of:

 Power and distribution transformers
 Instrument Transformers
 Rotating Machines
 Power Capacitors
 Switchgears
 Surge Arrestors
 Research & Development

Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice. LL_DDX9121b-1_1311_SG_1.doc – 1/6

USER ORIENTATED INTERFACE

The user interface has been designed to make PD readings
easy. All options are grouped by categories, and the scope
window shows all test related information. Even specific
colours have been selected to reduce the strain on the
user’s eyes during long term testing.

Indications about the detector status, selected frequency
band, input channel, PD level, Test voltage, and frequency
are grouped in the scope window and can be displayed at
any time.

Detector settings are displayed next to the scope window
by clicking the settings button, all options are grouped by
category to make the configuration of the device easier
than ever.

MODULAR DESIGN

for normal partial discharge test on one phase test objects
the DDX9121-1 is equipped with one measuring input
(DDX9121b-1).

For distribution transformers, the DDX9121b-MUX option
(released by software code) add an embedded manual

switch with “ALL” option. With this new feature the

transformer is tested as a single phase test object, and
switch is only used to locate the phase if PD level is above
the limit.

For power transformers, several detectors (up to 9) can be
combined and connected to a single computer providing
simultaneous PD readings. Complete measuring system
can be controlled from a laptop or built into a measuring
desk.

REAL TIME SIMULTANEOUS MEASUREMENTS

The DDX®9121b multi-detector PD system provides
simultaneous PD level and phase resolved displays of the
PD activity at any given moment during the test. A user can
use this information to characterize and possibly locate the
origin of discharge sources.

A chart recorder provides a hard copy of partial discharge
level versus voltage and testing time for each channel in
one customized graph. Any time during the test the partial
discharge levels can be monitored and after the completion
of the test, customized test reports for the multiple
channels can be generated which automatically populate
with snap-shots from notable events.

Haefely has a policy of continuous product improvement. Therefore we reserve the right to change design and specification without notice. LL_DDX9121b-1_1311_SG_1.doc – 2/6