The system consists of two parts: the control unit (including
laptop), and the HV unit. The HV unit divides in two,
making transport and set-up much easier. One of the
unique features of the MV DAC-30 is that the HV unit
consists of a voltage source with an internal PD detector.
Unlike with other PD measurement systems, the cable
under test is the only accessible live component when
testing with the MV DAC-30, making it much safer.
The operating software guides the user through the entire
process. Some key features are:
Integrated cable database
Fully automatic calibration
Live PD mapping: evaluation and display of results
during the actual measurement
Reporting by mouse click
DESCRIPTION
The MV DAC-30 is a DAC (Damped AC Voltage) test set
with a peak voltage of 30 kV. The test set can be used for
quality control on newly installed cables, in accordance with
the IEEE 400.4 standard. In addition, to prevent unplanned
outages, the unit can also be used for condition-monitoring
purposes on aged cable circuits.
The main use of the DAC test set is to identify, evaluate
and locate partial discharge (PD) faults in the insulation and
accessories of all types of medium voltage power cables. PD
activity is an indication of incipient insulation faults and is
therefore widely regarded as one of the best ‘early warning’
indicators of deteriorating medium and high voltage
insulation.
Partial discharges are regarded as the main breakdown
cause for MV and HV cables. Performing offline PD
measurements on MV and HV cables using a DAC voltage
test set helps support the asset management process so
that the correct decisions are made for future maintenance
and replacement activities.
Since the DAC frequency of the test voltage is close to
nominal AC service conditions, all measured PD activities
can be accurately evaluated and compared with the
power frequency. The PD inception voltage (PDIV) and PD
extinction voltage (PDEV) can be easily determined due to
the decaying amplitude of the test voltage.
Safest operation thanks to fully isolated design.
Uses well proven DAC excitation voltage for
PD measurements (acc. IEC 60270)
Real-time data evaluation and display of results
Two part design for easy transportation
MV DAC-30
Test and diagnosis system for medium
voltage cables
TECHNICAL DATA*
Output voltage
DAC 3 … 30 kV
peak
Precision ± 1 %
Resolution 0.1 kV
Frequency range 20 ... 500 Hz
Capacity range 1 nF ... 10 μF at 20 kV
peak
1 nF ... 4.25 μF at 30 kV
peak
PD sensitivity range 2 pC … 100 nC (acc. to IEC60270)
Resolution ± 1 pC
System noise level < 20 pC at 30 kV
peak
PD impulse repetition rate 100 kHz
PD localisation
Measuring range 0 … 16,000 m | V/2 = 80 m/µs
Propagation velocity 5 … 120 m/µs
Sampling rate 125 MHz (8 ns)
Bandwidth 3/25 MHz (switchable)
Precision 1 % of the cable length
Resolution ± 1 pC / ± 0.1 m
Filter Analog und digital
Input voltage 110/230 V, 50/60 Hz, 500 VA
Temperature
Operation - 20 °C … 55 °C
Storage - 30 °C … 70 °C
Relative humidity 93 % at 30 °C
(non-condensing)
IP rating IP 20
Weight
HV module 30 kg
Control module 25 kg
Dimensions (W x D x H) 56 x 42 x 100 cm
FEATURES
Safe-to-touch, enclosed metallic casing
Internal PD Detector
“Live” evaluation and display of results
Two part design for easy transportation
Conforms to VDE safety standards
High test capacity
SALES OFFICE
Megger Germany GmbH
Dr.-Herbert-Iann-Str. 6,
D-96148 Baunach
T +49 9544 68-0
E team.international@megger.com
MV-DAC-30_DS_EN_V02
www.megger.com
ISO 9001
The word ‘Megger’ is a registered trademark
MV DAC-30
Test and diagnosis system for medium
voltage cables
ORDERING INFORMATION
Product Order no.
MV DAC-30 100 6132-S
control and HV unit, laptop, calibrator, SW license, set of cables (incl. 5 m HV-connection cable)
Options:
HV-connection cable 5 m 200 6817
HV-connection cable 10 m 200 8839
HV-connection cable 15 m 200 8840
Rugged flight case for control unit 9 001 7826
Rugged flight case for HV unit 9 001 7827
* We reserve the right to make technical changes.