Abstract: Perfect power monitoring system is vital not only for improving the quality of coal power supply,but also for ensuring the production safety. Based on industrial Ethernet and fieldbus technology,the Coal Power Monitoring system introduced in this paper will certainly play an important role in coal production due to the following reasons:the system can realize power system monitoring , real-time data acquisition and analysis, fault alarm and event records;furthermore,it has the function of rich graphics demonstration, human-computer interaction, statistics and report forms.

Key words: Coal mine, Power monitoring, Industrial Ethernet, Fieldbus, Data Acquisition