Substation Monitoring System to Troubleshoot Alarms
By: CAS DataLoggers
CAS DataLoggers provided the monitoring system for a wood product manufacturer that was occasionally experiencing alarms at their main incoming power substation. Because the alarms happened infrequently, they had difficulty identifying the cause. However, these alarms were disrupting production and proving costly over time. Maintenance staff believed that they could identify the root cause if they could record power levels and other parameters but the sporadic nature of these faults meant that they would have to wade through enormous amounts of data to find the small amount that was relevant. Ideally, the customer wanted to monitor the power levels 10 minutes before and 10 minutes after each fault, so they required an solution capable of event-based logging.
The manufacturer installed a dataTaker DT80 Intelligent Data Logger in the substation's control room cabinet which was then connected to sensors on the incoming main and various branch circuits. The DT80 is a cost-effective, universal input data logger which is expandable with the ability to connect to nearly type of sensor. Given that the client wanted to capture data from 10 minutes prior to and 10 minutes following an electrical fault, they took advantage of the loggers data 'Archive' function.
The logger was programmed to measure the key parameters (voltage, current, power, frequency) every second with alarms set to trigger whenever any of the parameters was outside of the normal operating range. Normally, this would result in over 300,000 points per day. However, whenever an alarm condition occurred a timer was started while the logger the data logger continued to record for an additional 10 minutes. At the end of the 10 minutes, the archive function was activated which took the previous 20 minutes of recorded data in memory and created a separated time stamped file. Utilizing this method they were able to go from searching through potentially hundreds of thousands of data points to looking at 2400 points for each event – a reduction of over 100x or more!
Maintenance staff was able to quickly retrieve the data via the local area network using either a FTP (https://en.wikipedia.org/
For more information on the dataTaker DT80 Universal Input Data Logger (https://www.dataloggerinc.com/