MV DAC-30
Test and diagnosis system for medium voltage cables
MV DAC-30
Test and diagnosis system for medium
voltage cables
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, according to 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 cable insulation and
accessories of all types of medium voltage power cables. PD
activity is an indication of incipient faults in the insulation
and is therefore widely regarded as one of the best ‘early
warning’ indicators of the deterioration of medium and high
voltage insulation.
Partial discharges are regarded as the main breakdown
cause for MV and HV cables. Performing ofine PD measure-
ments on MV and HV cables using a DAC voltage helps sup-
port the asset management process so that reliable decisions
can be made for maintenance or replacement activities.
Since the DAC frequency of the test voltage is close to nom-
inal AC service conditions, all measured PD activities can be
effectively evaluated and are comparable with the power
frequency. The PD inception voltage (PDIV) and PD extinc-
tion voltage (PDEV) can be easily determined due to the de-
caying amplitude of the test voltage.
■
Safest operation as of fully save to touch
metallic enclosed housing with integrated
voltage source and PD detector
■
Uses well proven DAC voltage for
PD measurements (acc. IEC 60270)
■
“Live” evaluation and display of results
■
As of two-part design easy to transport
DESCRIPTION
The system consists of a notebook as a control unit and the
HV part. The HV part contains of two units allowing easy
transportation and set-up. One of the unique features of the
MV DAC-30 is that the HV part consists of a voltage source
with internal PD detector. During testing no other “live”
components apart from the cable being tested are accessible
like with other PD measurement systems.
The operating software guides the user through the entire
process. Some key features are:
■
Integrated cable data base
■
Fully automatic calibration
■
“Live” PD mapping; evaluation and display of results
during the actual measurement
■
Reporting by mouse click
2
Seba Dynatronic
Mess- und Ortungstechnik GmbH
Dr.-Herbert-Iann-Str. 6
96148 Baunach
Germany
T 0049 9544 68-0
E team.international@megger.de
SALES OFFICES
Megger GmbH
Obere Zeil 2
D-61440 Oberursel
Germany
T 0049 6171 92987-0
E info@megger.de
MVDAC30_DS_EN_V01
www.megger.com
ISO 9001
The word ‘Megger’ is a registered trademark.
* We reserve the right to make technical changes.
ORDERING INFORMATION
Product Order no.
MV DAC-30 1006132-S
MV DAC-30 control and HV unit, laptop, calibrator, SW license, set of cables (incl. 5 m HV-connection cable)
Options:
HV-connection cable 5 m 2006817
HV-connection cable 10 m 2008839
HV-connection cable 15 m 2008840
Rugged ight case for control unit 90017826
Rugged ight case for HV unit 90017827
MV DAC-30
Output voltage
DAC
Precision
Resolution
3 … 30 kV
peak
± 1 %
0.1 kV
Frequency range 20 ... 500 Hz
Capacity range 1 μF ... 10 μF at 20 kV
peak
1 μF ... 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
Propagation velocity
Sampling rate
Bandwidth
Precision
Resolution
0 … 16000 m / V/2 = 80 m/µs
5 … 120 m/µs
125 MHz (8 ns)
3/25 MHz (switchable)
1 % of the cable length
± 1 pC / ± 0.1 m
Filter Analog and digital
Input voltage 110/230 V, 50/60 Hz, 500 VA
Temperature
Operation
Storage
- 20 °C … 55 °C
- 30 °C … 70 °C
Relative humidity 93 % at 30 °C (non-condensing)
IP rating IP 20
Weight
HV module
Control module
30 kg
25 kg
Dimensions (W x D x H) 56 x 42 x 100 cm
TECHNICAL DATA* FEATURES
■
Fully save to touch, metallic enclosed housing
■
Internal PD Detector
■
“Live” evaluation and display of results
■
Easy to transport as of two-part design
■
VDE conform control and safety concept
■
High testable capacity