Megger’s distribution profilers
April 2014
Electrical Power & Protection
The Megger MDP series of distribution profilers provides power utilities with accurate and extensive information to evaluate loading on feeders or overhead lines precisely and to identify the need for any upgrades or replacements. The three different models range from a simple current-only version to the most advanced unit equipped with features requested by the market. Each MDP can be easily upgraded to the next model at any time.
System planners, distribution engineers and troubleshooters can easily access, review and record the following via a date and time stamp: peak load value/time growth studies; phase/load imbalance surveys; time/day fluctuation analysis; and capacitor bank placement analysis.
Each MDP unit has a large non-volatile memory which allows for nearly unlimited data recording. The RMS response interval is user-selectable from 10 to 60 cycles and the RMS storage interval may be set from 2 s to 6 h. The waveform capture is synchronised with the RMS storage interval with a selectable number of sequential waveforms from 1 to 60 cycles per sample, dependent on the mode. Four easily replaceable commercial AA batteries power the unit. In the event of battery failure, there is no loss of information.
Depending on the response and RMS storage intervals selected, the profilers can record for days, weeks or even months. For example, with a response interval of ten minutes (data averaged and stored every 10 minutes), the profiler records for more than 60 days when powered by a new set of batteries. If the battery reaches a low charge condition, the unit automatically stops recording and saves all data for later recovery.
The profilers are quickly installed at any point on the distribution line. An arrow on the back of the MDP unit should point towards the load. Since all units are mechanically identical and weigh less than 2,1 kg, they are easily mountable on many common clamp sticks for installation on live lines. Cable diameters from 30 to 50 mm can be accommodated. A mounted LED located on the bottom of the installed unit indicates battery status.
For more information contact Stuart Ashton, Surgetek, +27 (0)11 792 1303, info@surgetek.co.za, www.surgetek.co.za
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