Calmu3 Electricity meter
3,228 views · Published 19 June 2015 · 3:09 · Indexed 4 November 2026
Channel: RODALCO2007 · 2015 · Science & Technology
These Calmu 3 meters were used in the mid to late 1980's in the former WEPB ( Waitemate Electric Power Board ). The meters were the first type of TOU (Time Of Use meters) The meters measure Active and Reactive power. At a local generating plant in West Auckland , we installed two of these meters back to back in series so that one meter was import and the other meter was the export meter. Meter reading was done with a brick 286 or 386 computer through an opto port and the language was DOS. This particular meter is a CT (Current Transformer) meter. and is driven through CT's. Which basically means that on a 200 Ampères supply the meter measures 5 Ampères and a multiplier of x 40 is added to the readings.
