Views:85 Author:Elena Publish Time: 2020-11-24 Origin:Site
Abstract：The intelligence, refinement and visualization of the distribution system are the trend 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 labor cost of maintenance, and realize the unattended monitoring of distribution system. 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.
0 Project Overview
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 power measuring instrument, and the working condition of Variable-frequency Drive and moter are unknow. Therefore, they purchased Acrel PZ series three-phase ammeter for motor current monitoring and frequency meter for monitoring frequency change.
1 PZ Series Programmable Intelligent Electric Meters
PZ series of meters adopt 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 RS-485 communication interface,adopt 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.
2 Model Description
3 Technical Features
|Input||Nominal value|| |
|Over load|| |
Current：1.2 times rating(continuous),10 times rating for 1 second
Voltage：1.2 times rating(continuous),2 times rating for 1 second
|Accuracy class|| |
Active power，active energy：0.5 Class
Reactive power，reactive energy：1.0 Class
|Communication||RS485 Modbus-RTU，1 bit start，8 bit data，1 stop position，1200/2400/4800/9600/19200bps|
|Energy||open-collector photo-coupler pulse，2 channels output|
|Alarm||1 passive open contact：1A/30VDC、2A/250VAC，high，low，and unbalanced alarm|
|Switch input||Passive contact input mode：build-in power supply，optocoupler isolation|
|Voltage||Voltage range||AC85-270V or DC100-350V |
4 Project Summary
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.