HV DAC-200 Test and diagnosis system for high voltage cables
The HV DAC-200 is a DAC (Damped AC Voltage) test set with a peak voltage of 200 kV. The test set can be used for acceptance testing on cables rated up to 132 kV according to the IEC 60840 and IEEE 400.4 standard. Moreover, the unit can also be used for condition analysis of 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 high 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 volt-age insulation.
Since the DAC frequency of the test voltage is close to nominal 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 extinction voltage (PDEV) can be easily determined due to the decaying amplitude of the test voltage.
Partial discharges are regarded as the main breakdown cause for HV cables.
Performing offline PD measurements on HV cables using a DAC voltage helps support the asset management process so that reliable decisions can be made for maintenance or replacement activities.
The system consists of a notebook as a control unit and an HV part. The HV part contains of an HV source, an electronic switch and a resonance inductor to generate a damped AC test voltage. The HV divider and the coupling capacitor for PD detection and localization are integrated in a separate unit.
The operating SW 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
The individual units are stored in tough transport cases which also allow for air-transport.
| 世强硬创平台www.sekorm.com | |
| 世强硬创平台电子商城www.sekorm.com/supply/ | |
| 世强硬创平台www.sekorm.com | |
| 世强硬创平台www.sekorm.com |
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