工業應用之三相電力量測系統

三相交流電為工業應用的標準電力來源，如何掌握其負載端的耗電狀況已成為提高生產效率、降低生產成本的主要關鍵。本論文設計一套可以即時監測與紀錄各項電力品質參數的三相電量測系統；本系統可量測的參數包括：實功率、虛功率、視在功率、諧波、電壓/電流有效值、功率因數、溫度…等等，使用者可根據這些參數推斷出目前三相負載的運作有無異常狀況發生。本系統在應用設計上提供了兩種輸出模式，一是接點輸出模式：在此模式時，偵測到三相參數超過預設臨界時，系統就會從乾接點送出導通訊號，提供控制電路使用；二是Modbus輸出模式：三相負載端的電力品質參數可透過Modbus與現場的可程式控制邏輯(PLC)溝通，PLC即可經由Modbus讀取三相負載端的電力品質參數。使用者可透過本系統得知目前三相負載的異常狀況，並安排適當的檢修與保養，以保證機台在理想的狀態下運轉，避免機台的故障發展成為重大缺陷或災難性的故障。關鍵詞：電力品質參數; 三相電量測系統; Modbus; 可程式控制邏輯

關鍵字

電力品質參數；三相電量測系統； Modbus ；可程式控制邏輯

並列摘要

Today, the three-phase system is a standard power source in industrial application. Therefore, grasp the load’s power consumption condition is essential for requirement of reducing production cost and improving production efficiency. This thesis is provide a three phase power measurement system to measure the plenty of power quality parameters such as active power, reactive power, apparent power, harmonics, RMS for voltage and current, power factor and temperature…etc. According to these parameters, operator could imply that whether the loads work normally or not. This system is design with two modes, the “I/O output mode” and the “Modbus link mode”. When the system works in the “I/O output mode” an I/O switch will be triggered to send out an alarm message or stop the load when the load is occur abnormal condition. In the ”Modbus link mode”, when the same issue occurs, in addition to triggering the I/O switch, it also provides a communication interface, a Modbus in specific, which is able to link with the PLC. After that, the PLC can make suitable corresponding acts to rectify such problems. Operator can know the load work condition via our system and determine the appropriate repairing and maintenance timing to prevent the malfunction becoming a serious disaster. Keywords: power quality parameters; three phase power measurement system; Modbus; PLC

並列關鍵字

power quality parameters ； three phase power measurement system ； Modbus ； PLC

參考文獻

[34] 王俊仁，2013，「具無線網路傳輸功能之振動監視與紀錄系統」，碩士論文，國立虎尾科技大學飛機工程系航空電子研究所。

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工業應用之三相電力量測系統

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