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The Basics of Electrical Bus Protections
When we examine electrical protection schemes, the best place to start is with electrical bus protections, as they are the easiest to protect. They utilize the fundamental concept of the overcurrent relay (Figure 1). An overcurrent relay is an electromagnetic device in which current in the coil surrounding a metal core produces magnetic flux in the core......READ MORE
Residual Voltage on Load Side of an Open Circuit Breaker
Siemens is occasionally asked to comment on the existence of a voltage on the load side of an open circuit breaker. For convenience, this will be called "residual voltage." Most often, this is a result of measurements made during commissioning a project, when there is no load on the switchgear bus and the main circuit breaker is in the connected position and open, with the incoming source (the line side of the main circuit breaker) energized. Any feeder or tie circuit breakers connected to the main bus are open. READ MORE
Case Study: Leading Oil Refinery Achieves Historic Returns on Auction for Surplus Assets in Caribbean
Leading energy companies are optimizing their surplus asset management programs to recovery, simplify operations, and enhance productivity and sustainability. Liquidity Services partnered with a leading oil refinery, leveraging multiple marketplaces to create a market in a remote Caribbean location and sell its surplus for nearly $1.5 million. READ MORE
Acceptable Levels of Distortion in the Mains Supply System
In the mains supply system, harmonic voltage distortion is the consequence of the flow of harmonic currents through the impedances in the power supply circuit connected to the converter. A typical power supply system at an industrial or mining plant consists of a source of AC power generation, which can either be a local generating station in a small system or a power station at the end of a transmission line or transformer in a large system. READ MORE
MEMA, MERA Applaud House Passage of Federal Vehicle Repair Cost Savings Act
Yesterday, the U.S. House of Representatives passed S. 565, the Federal Vehicle Repair Cost Savings Act, requiring federal agencies to consider using remanufactured parts for vehicle fleet repairs. The Moror & Equipment Manufacturers Association (MEMA) and its remanufacturing division, the Motor & Equipment Remanufacturers Association (MERA), applauded the vote. READ MORE
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Planning for the 2016 PEARL Annual Conference is underway and we want to hear from you! As this conference is to benefit you, please send us topics that you would like to hear presented by completing this quick survey. Any and all ideas are appreciate! If you have ideas for potential speakers or you think you have a presentation worth sharing, please also include those suggestions in the survey.
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NECA 2015 Convention & Trade Show
October 3-6, 2015
San Francisco, CA
More information
IEEE Industrial Applications Society Annual Meeting
October 18-22, 2015
Addison, TX
More information
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The next PEARL Board of Directors meeting will be an in-person meeting and takes place Saturday, October 10. A recap of the meeting will be presented in next month's newsletter.
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