The intelligence, refinement and visualization of the distribution system are the trends of distribution management. The smart power meter is designed and installed for the power distribution circuit, in order to real-time monitor the working state of each load circuit by setting the parameters of the smart meter. It can improve the safety of energy usage, improve the efficiency of equipment maintenance, reduce the labor cost of maintenance, and realize the unattended monitoring of the distribution systems. Through data collection, real-time monitoring of electrical parameters, analysis of the power quality, and distribution system running status, it will save users’ power maintenance costs. This article gives a brief introduction of Acrel PZ ammeter and frequency meter used in Iceland Tandraberg ehf company's motor monitoring project.
Tandraberg ehf company, located in Eskifjörður, is one of the largest manufacturers of refrigerated pallets in Iceland, Its main production electricity is motor load, which is used for process cutting. Since the original motor, control cabinet doesn't install with a power measuring instrument, and the working condition of the Variable-frequency Drive and moter are unknown. Therefore, they purchased Acrel PZ series three-phase ammeter for motor current monitoring and a frequency meter for monitoring frequency change.
PZ series of meters adopts AC sampling technology, which can separately measure the current, voltage, power, power factor and electric energy parameters in the grid. It can set the electrical parameter through the panel button. This meter has an RS-485 communication interface, adopts Modbus protocol; also can convert the power signal into a standard DC analog signal.The meter also has switch input/output,relay/alarm output,etc.
PZ series power meter have high price performance, which can replace power transmitter and other measuring instrument. As an advanced intelligent and digital acquisition device, the power meter has been widely used in various control systems, SCADA systems and energy management systems.