Single and Poly-Phase Energy Data Acquisition System
using the IntelliLogger IL-Mini™
The IL-Mini™ coupled with a WNB pulse output power meter results in a flexible, stand-alone energy (kWh) data acquisition system.
The WNB electrical meter is connected to the high-voltage electrical service to be measured and outputs a contact closure pulse for every unit of energy (eg Watt-hour) that flows through the electrical service. The relationship of pulses and Watt-hours (Wh) depends on the model of WNB meter as well as the full-scale CT’s used. For example, the WNB might be configured to output a pulse for every 100Wh measured.
The WNB requires electrical voltage sensing connections to each of the phases as well as current transformers (CT’s) for current measurement on each of the phase conductors. The power meter runs autonomously sampling the phase voltages and currents very quickly, calculating instantaneous power and totalizing electrical energy (power over time). The WNB then outputs a pulse after a defined amount of energy has been measured. By totalizing these pulses and scaling for the relationship between pulses and energy, the amount of energy measured is known. This scaling and totalization is simply performed by the connected IL-Mini™ data logging instrument.
The WNB meter output is connected via a pair of wires to the digital input channel on the IL-Mini™ which in turn is configured as a Counter input.
To configure the IL-Mini™ for the scaling, counting and other desired data acquisition functions, a program is built within the Logic Beach HyperWare-II software. This program is called a “Program Net” as it consists of a number of icons all visually connected together with a mouse to make a “network”.
The Program Net is then uploaded to the IL-Mini™ memory where it executes. Due to the intuitive flexibility of the HyperWare-II software, there are unlimited data acquisition schemes that can be implemented with the Program Net. Below is a simple Program Net that samples reads the accumulated pulse totals received on the Counter input every 5 minutes, converts the pulses to kWh then sums them for 15 minute and 24 hour intervals and stores the totals to memory accordingly.