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

0

20

40

60

80

100

120

1 10 100 1000 1000 0

Frequency (kHz)

f

1

f

2

0

20

40

60

80

100

120

1 10 100 10 00 1000 0

Partial discharge FFT

RF broadcast FFT Tyristor pulse FFT

Optimized measuring band

f(khz)

SELECTABLE MEASURING BAND

A wide band detector measures and displays the composite
of all the signals and interference present within its
bandwidth. Any PD activity will be difficult to differentiate
from the noise floor. However, there could be a number of
areas in the frequency spectrum where PD signals is at a
much higher level than the unwanted interference. Defining
a measuring band within these optimized areas will result
in a higher measuring sensitivity and therefore a lower
ground noise level.

The IEC 60270 defines some limits in regards to the
measuring band as following.

30kHz < f1 < 100kHz

f2 < 500kHz

100kHz<f <400kHz

EASY TO CONFIGURE

The DDX9121b measuring system is based on passive
coupling impedances without batteries. In addition the wide
range of the input voltage (140 V) makes the device
connection easier than ever.

Just connect the coupling impedance (AKV9310) to your
coupling capacitor, plug the DDX9121 to the net and
connect through a normal or fiber optic (optional) LAN
cable to the computer. Connect the included twin BNC
cable between the DDX9121b and the impedance and start
measuring PD.

SIMULTANEOUS PD AND RIV READINGS
(OPTIONAL)

The DDX 9121b measures RIV according to ANSI and
NEMA 107-1987, therefore the replacement of outdated RIV
measuring instruments is straight forward without
differences in measurement results.

Both RIV voltage (mV, According to NEMA 107-1987) and
Partial discharge (pC, according IEC 60270) measurements
are done simultaneously, therefore both are performed in a
single test without overstressing the test object. In
addition, real time comparison between PD level and RIV is
possible.

PD UNDER DC (OPTIONAL)

The DDX9121b is equipped with a frequency spectrum
analyzer, where the operator can easily select the optimized
measuring band based on the measured ground noise.

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 – 3/6

While measuring PD on DC test voltage, an
accurate recording of each PD event is of maximum
importance, as the accepting/rejecting value will
take into consideration not only the magnitude of
the pulses, also the number of pulses during the
test duration. The DDX9121b is a trusty device
while doing this particular test.

V(kV)

PD(pC)

Inception

Voltage

PD trigger level

Extintion

Voltage

PD Pattern

Noise Pattern

DATA ACQUISITION & ANALYSIS

The advanced data acquisition and analysis software allows
a wide variety of possibilities such as recording PD pulses
of each and every test voltage cycle and analyzing them
both in the temporal and phase domain.

A chart recorder provides a hard copy of partial discharge
level versus voltage and testing time for each channel in
one customized graph. At 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.

Chart Recorder with graphs PD vs. voltage and time

With the pattern acquisition and analysis module, several
two- and three-dimensional PD pulse patterns of all the
monitored channels (when equipped with a multiplexer)
can be displayed and recorded. Snaps shots of the 3D
patterns can be saved into a windows gallery for further
uses like customized test report generation or to export
them as image files.

Data filters and time-sliced views further permits a detailed
look at the PD pattern as deep as every cycle of the applied
test voltage and in certain cases, helps separate and
identify noise interferences.

INCEPTION AND EXTINTION PD TEST

IEC 60270, on paragraph 8.3.1 describes the
inception/extinction PD test. Generally the test is performed
by increasing the voltage until the PD level reaches a
trigger level, and then voltage is decreased until the PD
level goes below the trigger level. Voltage levels are
recorded at those two moments as Inception and extinction
voltages.

The DDX9121b can show graphically the results of this
particular test, and provide the inception and extinction
voltages.

DATA EXPORT AND REPORTING

The reports are saved as HTML files containing graphs and
charts. In addition all data can be exported as comma
separated values(CSV) format for further analysis or highly
customized test reports in other programs like MS Excel

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 – 4/6

Simultaneous PD inputs

1 1 3 3 4 4 6 6 8 8 Non-simultaneous PD inputs
Option DDX9121b/MUX

Opt 4 Opt 3 Opt

12

Opt

11

Opt

16

Opt

15

Opt

24

Opt

23

Opt

32

Opt

31

Simultaneous RIV inputs

Not 1 Not 3 Not 4 Not 6 Not 8 Non simultaneous RIV inputs

Option DDX9121b/MUX

Not

Opt 3 Not

Opt

11

Not

Opt

15

No

Opt

23

Not

Opt

31

PD on DC
Option DDX9121b/DC

Opt

Opt

Opt

Opt

Opt

Opt

Opt

Opt

Opt

Opt

Phase resolve analysis

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Spectrum analyzer and scope

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Selectable measuring band

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

DDX9121b/MUX

DDX9121b/FO

software key to enable the embedded
non simultaneous 4 inputs

Fiber optic adaptor to connect the
DDX9121b and the computer
DDX9121b/DC

Software key to enable PD measurement
under DC

LAPTOP

DESK WITH MINIRACK AND PCI COMPUTER

Laptop with DDX9121b software
preinstalled and configured. Windows 7
in English included.

Desk with minirack including PCI
computer, screen and mouse.
DDX9121b and windows 7 pre-installed
MINIRACK

Rack on wheels for multi-detector
configurations, rack can be located into
the test room and connected to the
computer through fiber optics

Key code

Key code

STANDARD CONFIGURATIONS

Opt -> Option

Other configurations than the ones below in regards to number of detectors or options are available upon request.

RIV calibrator included in the device picture is requested but has to be purchased separately

OPTIONS

COMPUTERS AND RACKS

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 – 5/6

PD Measuring

Input Impedance

50 

PD System Bandwidth

30 kHz … 1.5 MHz (-6dB)
(with internal analog filter)

10 kHz … 1.5 MHz (-6dB)
(without internal analog filter)

Filter Center Frequency

Freely selectable (32 kHz … 1.498

MHz)

Filter Bandwidth

4 kHz / 4.5 kHz / 9 kHz

10 … 100 kHz, in 10 kHz steps

100 … 500 kHz, in 50 kHz steps

600 kHz … 1 MHz, in 100 kHz steps

Sensitivity

< 0.1 pC (directly at AKV 9310/T
quadripole input)

Input Atten. Range

0 dB / 20 dB / 40 dB

Linearity Error

< 5 % (1 … 100 % FSR)

Pulse Phase Resolution

0.35°

Voltage Measurement

Input Voltage Range

0.14 … 140 VAC (RMS)

-200 … -0.2 / +0.2 … +200 VDC

Frequency Range

15 … 400 Hz

Input Impedance

1.7 M / 11 pF

Linearity Error

< 1 % (0.1 … 100 % FSR)

Synchronization

Voltage or Mains input

Synchronization Accur.

< 5° Environmental

Operating temperature

0°C … +45°C

Storage temperature

-20°C ... +60°C

Relative Humidity

5% … 80%, non-condensing

RIV Measurement System

Frequency Range

850 … 1150 kHz

IF Filter Bandwidth

4.5 kHz and 9 kHz

Image Rejection

> 55 dB

Stop Band Attenuation

> 70 dB @ 7.5 kHz

> 60 dB @ 10 kHz

Linearity Error

2 dB @ 10 Hz … 1 kHz PRF, 1/10
… 10x calibration level

Quasi-Peak Detector
Response

According to NEMA 107, ANSI
C63.2-1996

Power Supply & Mechanical

Voltage

90 … 264 VAC

Frequency

50 / 60Hz

Dimensions (WxDxH)

483 mm x 306 mm x 89 mm

Weight

6.2 kg

EMC

Compliant to EMC directive
2004/108/EC (EN 61326-1)

Safety

Low voltage directive 2006/95/EC
(IEC 60010-1)

Vibration

MIL-STD-810G Table 514.6C-II,
Category common carrier

Applicable Standards

IEC-60060 Parts 1&2

ICEA T-24-380

IEC-60270

ASTM D1868-93

IEC-885-2 and 885-3

ANSI C57.113

IEEE Std. 4, 1995

ANSI C57.124-91

ANSI C63.2-1996

NEMA 107

CALIBRATORS

KAL 9520 High precision PD calibrator

High precision partial discharge
calibrator touch screen controlled with
a very wide, continuously variable
output pC range

9216 hand held battery PD calibrator

Small battery powered PD calibrator.
Pulses outputs ranges are 10, 100, 1000
and 10’000 pC

KAL 9530 RIV calibrator

RIV calibrator (KAL 9530) including a
signal generator, RIV calibration set,
clamp and a switching.

MEASURING IMPEDANCES

AKV 9310 passive universal coupling impedance

Compact impedance fully passive
with enhanced sensitivity.
AKV 9330 Capacitors optimized coupling impedance

Active measuring impedance optimized
for PD testing of power capacitor as per
IEC 60270. It is rated for 300 amperes.

COUPLING CAPACITORS

9230 coupling capacitors

Consist of a high voltage unit mounted
on a mobile (with wheels) base frame
and includes a suitable top electrode
and a coupling impedance.

Europe, Asia, South &
Central America, Australia

Haefely Test AG
Birsstrasse 300
4052 Basel
Switzerland
 + 41 61 373 4111
 + 41 61 373 4912
 [e-mail]

China (Sales & Service Office)

Haefely Test AG – Beijing Office

8-1-602, Fortune Street

No. 67, Chaoyang Road, Chaoyang District

Beijing, 100025

P. R. China

 + 86 10 8578 8099

 + 86 10 8578 9908

 [e-mail]

North America

Hipotronics Inc.

1650 Route 22

PO Box 414

Brewster, NY 10509

USA

 + 1 845 279 3644
 + 1 845 279 2467

 [e-mail]

TECHNICAL SPECIFICATIONS

ACCESSORIES FOR PD TESTING

www.haefely.com

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 – 6/6