Measure energy to manage it
A classic success story using Janitza power analysers and meters continues at The University of Otago in Dunedin.
Hans Pietsch, energy manager at the property services’ division at the university, replaced his power meters and some other energy measuring instruments with the Janitza UMG604 Din-rail mounted power analyser, and UMG96 RM panel mounted slave meters to measure and analyse the power consumption in some campus buildings.
The project was aimed to have real time monitoring, energy cost allocation, load monitoring, and load control. The university takes part in a load control programme that requires some load to be switched off rapidly (less than one second) whenever the supply frequency drops below a minimum threshold. To achieve this, electrical loads are either controlled directly by the meters or through the BMS via the UMG604 in each individual building on their network.
The university paid for its required power consumption data. Today, energy consumption data is gathered from the UMG604 meters over the LAN and used to allocate the cost of electrical energy to each building and facility. Initially, the cost saving from about 18 months’ worth of data acquisition service was sufficient to cover the cost of butting the Janitza instruments.
Direct Control’s technical team helped integrating these instruments into their network by providing the required technical assistance, training, and ongoing support.
The current install base has about 50 UMG604 energy meters and more than 40 UMG96RM slave meters monitoring electrical power consumption in its buildings and networked through their local area network (LAN).
These meters are now used for load shedding functions and help stabilize the supply frequency almost instantly by using some of the PLC functionalities embedded in the UMG604, and acting directly on local loads without delays caused by slow LAN traffic.
With digital inputs and outputs, the UMG604 also has the ability to perform some simple PLC functions locally. Energy MAX (load Shedding) and cost calculation are a few of the additional features of the UMG604.
With these meters in place, and with many others to possibly come in future, The University of Otago could easily expand this network and use the web based Janitza energy portal to have a complete visualization, monitoring and data analysis of the entire campus. This will provide an invaluable insight toward further cost savings in future.
See Direct Control at the EEA conference trade show, Stand 108, in Sky City convention centre in Auckland from 18-20 June 2014