The Delhi Metro is a rapid transit system serving Delhi, Gurgaon, Noida and Ghaziabad in the National Capital Region of India. The network consists of six lines with a total length of 189.63 kilometers with 142 stations of which 35 are underground. It has a combination of elevated, at-grade and underground lines and uses both broad gauge and standard gauge rolling stock. The Delhi Metro is built and operated by the Delhi Metro Rail Corporation Limited (DMRC). The metro has an average daily ridership of 1.8 million commuters and the DMRC operates around 2,700 trips daily between 6:00 and 23:00 running with an interval of 2 minutes 30 seconds between trains at peak frequency.
Predictive maintenance using thermal imaging
Installation of a thermal imaging camera
The Composite Video Out of the FLIR E50 thermal imaging camera was linked to a Digital Video Recorder (DVR) with capacity of one Terabyte in order to record the data. After monitoring the section insulators for an hour the system writes a video file. These hourly video files were used to correlate temporary rises in temperature with the time of day, network load and other factors to determine the cause of the problem.
Causes found in thermal data
Tests were conducted at sites where the problems were severe and the results were recorded during the instances when the pantograph passes the section insulators. It was observed that factors like system load and environmental conditions played a big role in the deterioration of the section insulators. To further attribute the problem the thermal imaging camera was used to monitor the instances when the temperature of the section insulators went above a previously set threshold.
Careful analysis of the thermal data has allowed the DMRC to take the appropriate action. This thermal information has also helped DMRC to check the redundancy of its system during different weather and loading conditions for ensuring better services to its commuters.
What is a section insulator?
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