CDS

The portable combined CDS is used as universal dielectric diagnostic system on PE / XLPE insulated cables as well as paper insulated cables worldwide. It combines the known methods of Isothermal Relaxation Current measurement (IRC-Analysis) and Voltage Return Method (RVM-Analysis) for aging and deterioration diagnostics. Due to the low charging voltage of the measurement the CDS works absolutely non destructive.

The diagnosis of PE / XLPE cables applies for evaluation of an IRC measurement a software-module with neuro-fuzzy-extension. The intelligent multi-stage evaluation software take into consideration the special construction criteria of the test object and categorises the condition of the test object, including an anticipated maximum residual voltage level.

The software includes a database with automatic research for calculation of voltage withstand prognosis values according to data material of the standard DIN VDE 0276 as well as the protocoling of the diagnostic results.

The RVM cable evaluation is done using proven standardised factors and threshold values.

The opening of the electric power markets and new forms of asset management lead to the need to increase life cycles of installed energy components and to be more economic regarding  existing underground installations. Using integral diagnostics, the cable operator has a valuable tool for non-destructive analysis of the cable network. This condition based maintenance makes planning easier whether to repair or replace an existing cable.

Link: An Article about an "Innovative and all-purpose Cable and Phase Identification Unit"

Features 

• Absolutely non-destructive condition evaluation of
• PE / XLPE / paper-oil insulated cable systems
• Simple operation and automatic measurement procedures
• Three-phase parallel measurement for current and voltage – duration of a complete measurement 1 hour
• Extended dynamic range for IRC measurement for long cable segments
• Measurement of charging current during formation
• Improved filters
• Extended capacity of internal rechargeable battery for serial measurements
• Extended formation voltage up to 5 kV – suitable for diagnosis on HV cables