Power Control Systems

Digital Meters, Load Managers, PF Controllers

Power Pro XT Meter

FEATURES

True RMS

Multiparameter monitoring

Replaces thirteen individual meters

All parameters with accuracy class 1.0s.

Compact 96 X 96 DIN enclosure

Micro-controller based

Optional RS-485 port

Optional Trip outputs

Ideal for supervision & audit of specific loads, cost analysis & cross checking of  utility billing meter.

Accuvar PF Controller

The control parameter is VAR, and not PF. Target PF value is just used to calculate the capacitive VAR required to be added/removed to achieve the desired PF. e.g. If the target PF is unity, means that the target VAR in the system is zero. If system KVAR is 200 lagging, then the controller needs to add 200 KVAR of capacitor banks to reach zero VAR.

The calculation of the reactive power in the system is done by taking instantaneous samples of all voltage and current waveforms, in all four quadrants. These values are then subjected to DSP techniques to add a frequency independent 90° phase shift to current samples. The product of these voltage and current samples then generate signed VAR value.

VAR controller then takes into calculation the prevailing system KVAR, the prevailing bank KVAR and the bank sizes of each stage, and then switches ON/OFF the combination which is closest to the needed VAR