case study
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Why is it Important to Set Date and Time in Numerical Relays? Numerical relays help in protecting different electrical equipment like generator, transformers, transmission lines, and motors. Therefore, many simple yet important things need to be checked with a Numerical Relay, like its running time (which can be manually set), current clock time, and current date. Now, it's common that many people… |
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How HT Motor Protection should be designed when running in parallel with Capacitor Bank All of our Case studies are shared with the clear aim to ensure that the problems that have arisen in one plant can be avoided in other plants, which would lead to a reduction in downtime and increase the productivity and profit margins. This case study is about a frequent Motor Failure problem in the processes industry. You can also check out my other case studies on… |
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Importance of Measuring Rated RPM Manually before Replacing Old Motors with a New One In today’s case study, we have a cement plant, where four dilution air fans (2 fans in each of the 2 units of the kiln) of 225 KW and 744 RPM is under operation. After five years of operation, one of the current motor (fan) was planned to be replaced with the spare motor which was there in the store for the last 4 -5 years. This was planned because the current… |
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Using LED Lights to Reduce Operating Cost in Industries that Run 24x7 In a country like India, the main concentration nowadays is on energy efficiency and effectivity. Stress is laid on replacing HPSV lights and fluorescent tube lights with LED lights. All plants and industries that are running 24 x 7 should focus on taking the step towards operating in an energy-efficient manner by using LED lights instead of HPSV lights and fluorescent tube… |
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Importance of Relay Coordination in Process Industries There are certainly quite a few cases of inadvertent tripping in cement plants, steel plants, fertilizer plants, FMCG and other industries that many Electrical Engineers witness at a certain point of time. Such scenarios occur in the majority of industries, not for the reason that the protection plan of these industries is not properly coordinated but because changes in the… |
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Importance of Relay Selection in Grid-Connected Industries Infinite sources do finite mistakes! Yes, it’s true and here is the case study that will help prove that what is being said here is true. The case study is about the Grid side that was scheduled to shut down for 2 – 3 hours for adding a new 33 kV distribution line in a substation and all the consumers were informed regarding the same 2 weeks in advance. It went as… |
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Importance of Vermin Proofing and Periodic Maintenance in HT and LT Panels Vermin is a term that we use for animals, mostly reptiles and birds which cause significant damage or annoyance. These animals love to set up their house in the nooks and crannies where control and protection wiring are housed. These small creatures try to get inside such nooks and corners and sometimes get stuck in electrical machines/installations thereby causing… |
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The best practice to change the direction of LT Motors to avoid Industry Accidents During a common operation & maintenance practice, I have noticed that in various plants for changing the direction of Low Tension motors that are below 15 KWs, the phase sequence inside the panel (the terminals below the power contactor or below thermal overload relay) is normally changed as shown in the picture above. … |
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Is spacing an important factor to consider while mounting an Auxiliary Contactor? Hello again Friends, I have been sharing many case studies related to Electrical Maintenance, hope you are enjoying them and they are useful during your plant operations. My motto behind sharing my experience is that the problem faced in one plant should not be repeated to other Plant. That being said. Let’s get into today’s case studies. … |
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Does Motor or Transformers in your plant fail or Burn-out without any warning signs? Have you experienced Motors or Transformers failing or Burning out in your plant without giving any warning signs during running, If yes then it is time to include a Routine Electrical Signature Analysis Maintenance for your Motor or Transformer. Motor current signature analysis (MCSA) has proven to be a highly valuable predictive maintenance tool. In this case study, I… |
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Don't use your Numerical Relay like Electromechanical Relay With the experience of working in more than 500 Plants with various types of Electrical services, I have come to know about the different problems Engineers face during Maintenance and Breakdown. Instead of keeping the exposure limited to me I decided to share it with my fellow engineers here by writing case studies. One such case study is as follows. … |
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What could cause repeated relay failures in a chemical plant? Just like the previous case studies, we bring to you one more actual incident that happened in one of the Chemical / Process Industry. We thought it was important and must be brought to notice to all concerned people working in O&M or Project in chemical industries to take due note of it as it may help other industries who doesn’t know about it. Repeated… |
