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Selecting, developing and deploying a document management system for engineering use involves the ability to follow an engineering revision process, integrate easily with engineering and corporate applications (custom or Commercial Off the Shelf (COTS)), uniting disparate on-premise and cloud systems, and integrating existing and evolved business processes and applications.
Breakdown of the stator winding turn insulation is a frequent cause of stator insulation failure leading to forced outage of medium voltage (MV) motors. Case studies of 15 turn insulation failures in mains-fed MV motors that occurred in Korea between 2011–2015 in the pulp and paper, power generation, and petrochemical industries are presented in this paper. The turn insulation failures are analyzed...
This paper describes efficiency measurement in induction motor and variable frequency drives systems under imposed voltage unbalance at the drive input. A number of drives from different manufacturers are tested with matching sizes of motors and the results are compared. The results highlight differences in the effect of voltage unbalance on drive performance. The results also indicate that intrinsic...
The life expectancy of digital excitation systems is influenced by the availability of spare and replacement parts. Many factors affect the ability of manufacturers to continue producing these systems and providing replacement parts. Strategies exist for prolonging the life of existing digital equipment and minimizing the cost impact of complete replacement.
A comprehensive discussion that details some of the practical field execution methodologies for Shock Risk Assessment and Arc Flash Risk Assessment (PPE Categories [Table] Method and Incident Energy Analysis Method). This is one of the single most effective techniques to plan safe electrical work in an accountable and proactive manner. The terminology used will be exclusively from the NFPA 70E-15...
This keynote focuses on More Electric Aircraft (MEA). First, aircraft energy systems are reviewed. All power sources in traditional aircraft are introduced and corresponding power consumers are presented. Then, the MEA concept is detailed and its advantages are discussed. A road to get more electrified is emphasized for Boeing 787 Dreamliner. Advanced technology contributions to fuel efficiency and...
This paper is a case study outlining the successful implementation of a wood chip pretreatment and interstage screening project at North Pacific Paper Company (NORPAC) in Longview, Washington USA. The paper will review the process changes inspired by a business wide energy efficiency initiative with focus on the thermo-mechanical pulp (TMP) mill and improved performance as a result of the pre-treatment...
As the baby boomer generation reaches retirement age, companies throughout the Forest Products Industry and their suppliers are working to cope with an unprecedented wave of turnover in both their engineering and skilled trade ranks. This presents a number of opportunities for younger persons entering the workforce, but also represents challenges to capture and pass on the lessons learned in the past...
Power quality metering is a situation that often does not afford the safety of de-energizing equipment before connecting probes; this is especially true for continuous processes such as those found in refineries. In this situation, a connection to energized equipment may be more common. When potential and current transformers are present in switchgear, it is usually desirable to make the probe connections...
This paper will present new approach that is advantageous to medium voltage (MV) distribution design configurations for large industrial and power distribution system configurations (specifically Main-Tie-Main) for large industrial and power station installations. Sixty years of traditional low cost design approaches (typical MTM and operated with open tiebreaker) are re-evaluated to demonstrate that...
This paper describes the IEC type A (AC only) ground-fault detection circuit and its limitations in accurately detecting electrical ground-fault currents in today's modern electrical installations. Discussed are the effects of waveform modifying power sources and the effect of the DC component on the efficacy of type A safety devices. Limitations of UL1053 standard for ground-fault sensing and relaying...
Outages within the paper industry lead to significant costs to operators. To reduce unplanned outage and losses condition monitoring (CM) techniques can be implemented to determine asset health and help target maintenance where it is most required. The challenges faced by the paper industry to implement condition based maintenance (CBM) on their medium voltage (MV) and high voltage (HV) networks and...
Measurement of transformer remaining useful life has long been a goal for responsible asset management. Most testing laboratories offer furan concentration testing as a suitable method. The interpretive method of choice is usually the Chendong equation expressed in practical terms as degree of polymerization of the paper with new paper at about 1000 and end of life at around 300. Typical mill transformers...
Most facilities have good procedures for conducting routine switching and maintenance. However, what are the procedures for an unplanned breaker trip or equipment failure? Who do you call? How do you lockout? Where do you ground? How do you assess the damage? How do you restart? These are all items that need to be thought about ahead of time so as not to waste a lot of time and create potential safety...
When the paper industry was first “electrified”, the only type of machine available that was capable of variable speed operation was powered by direct current. There were a number of knowledgeable manufacturers and users around who knew how the machines worked and how to take care of them.
Light Emitting Diode (LED) luminaires have lower maintenance costs, higher energy efficiency, and greater functionality compared to traditional lighting technologies. LED luminaires are quickly becoming established as the preferred lighting technology for industrial applications. As a result of the increased adoption rate, industrial users should consider a host of alternatives to properly specify...
This document discusses some common mistakes that are made in the commissioning of High Resistance Grounding (HRG) systems. While high resistance grounding has been in use for some time, many commissioning teams are less familiar with HRG systems and various issues can arise in the commissioning process. Topics discussed include: compatibility of equipment with HRG systems; how system configuration...
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