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Conference Record of 2004 Annual Pulp and Paper Industry Technical Conference (IEEE Cat. No.04CH37523)最新文献

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Selecting the excitation system for the additional turbine generator at the Port Wentworth pulp mill 为温特沃斯港纸浆厂的附加涡轮发电机选择励磁系统
R. Jordan, R. Schaefer, J.A. Estes, M. R. Dube
Weyerhaeuser Company owns a market softwood pulp manufacturing facility at Port Wentworth, GA and the company was looking for a way to reduce manufacturing costs. It was determined that if a used steam turbine generator could be installed at the plant, this would be a viable way to reduce manufacturing costs. The unit would displace purchased electrical energy with "in house" generation during times that the plant could produce the energy for less than it would be charged by the electric utility. During these times, the unit would be operated in a mode such that the electrical energy flowing into the plant through the utility intertie would be kept to a minimum (tie line control mode). During other times of the year, providing that it was economical, the plant could sell electrical energy to the utility. Once the unit was purchased and the degree of reconditioning and repairs to the turbine and the generator had been determined, the next major decision was which of the auxiliary systems could be re-used. This paper covers the process involved in evaluating whether or not to reuse the generator's original compound excitation system and if replaced, the type of excitation system that should be installed, compound or potential bus fed type. Discussed are the issues encountered during the evaluation process, the expectations desired, the decisions made and the outcome achieved as a result of the final decision to replace the existing compound excitation system with a potential bus fed excitation system.
惠好公司在乔治亚州温特沃斯港拥有一家市场软木纸浆制造工厂,该公司正在寻找一种降低制造成本的方法。经确定,如果可以在工厂安装一台二手蒸汽涡轮发电机,这将是降低制造成本的可行方法。该装置将取代购买的电能与“内部”发电,在时间内,工厂可以产生的能量比它将由电力公用事业充电。在此期间,机组将在这样一种模式下运行,即通过公用事业网络流入工厂的电能将保持在最低限度(线路控制模式)。在一年中的其他时间,如果经济的话,电厂可以把电能卖给公用事业公司。一旦机组被购买,涡轮机和发电机的整修和修理程度已经确定,下一个主要决定是哪些辅助系统可以重新使用。本文介绍了评估是否重新使用发电机原有的复合励磁系统的过程,如果更换,应安装的励磁系统类型是复合励磁还是电位母线馈电励磁。讨论了在评估过程中遇到的问题,期望,所做的决定以及最终决定用潜在的母线馈电励磁系统取代现有的复合励磁系统所取得的结果。
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引用次数: 5
Thermal derating of TEFC induction motors coated or partially flooded by spilled pulp 被溢出的纸浆覆盖或部分淹没的TEFC感应电动机的热降额
M. Valenzuela, M. Millar, J. Tapia, J. Rooks
Induction motors driving the agitators in pulp tanks are affected by the leakage of pulp that coats their inter-fin channels, blocks the air inlets of the fan cover, or partially floods them. This paper presents a complete thermal evaluation of TEFC induction motors during these abnormal conditions. A totally enclosed fan cooled (TEFC) induction motor fitted with 12 thermocouples was tested in the different situations of interest, including pulp spilled over the frame, in the air intake, and partially flooding it. Winding, frame, and bearing temperatures were measured. These results are used to determine the required oversizing of an agitator motor in order to assure that the motor will not fail even if the inter-fin channels become obstructed with spilled pulp.
驱动纸浆槽内搅拌器的感应电动机受到纸浆泄漏的影响,纸浆泄漏覆盖了它们的翅片间通道,阻塞了风扇盖的进气口,或部分淹没了它们。本文给出了TEFC感应电动机在这些异常条件下的完整热评估。一个装有12个热电偶的全封闭风扇冷却(TEFC)感应电机在不同的情况下进行了测试,包括纸浆溢出框架,进气口和部分淹没它。测量了绕组、机架和轴承的温度。这些结果用于确定搅拌器电机所需的超大尺寸,以确保即使桨片间通道被溢出的纸浆阻塞,电机也不会失效。
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引用次数: 5
Understanding the EASA mechanical repair guideline 理解欧洲航空安全局机械维修指南
C. Nyberg, A. Bonnett
The quality of motor repair depends on the quality of the facilities that are available to make the repair. Historically, there has not been a lot of information available to service centers to use as a comprehensive guide to electric motor repair. End users of machinery always look for a resource, a document upon which to base our repairs. The EASA Standard ANSI/EASA AR100-2001 Recommended Practice for the Repair of Rotating Electrical Apparatus provides important guidelines; however, it does not go into great detail. Last year, EASA made available the publication, a detailed guideline, titled "Mechanical Repair Fundamentals". The book breaks down the motor into its mechanical components and offers specific repair procedures and tips for each component of the motor system. IEEE Standards are referenced throughout the text. This paper gives an overview of "Mechanical Repair Fundamentals" and how it is structured. It can be used by the service center for reference and by the end user to help them understand how their motors are repaired. The value to the end user is that he/she can direct the motor repair facility to specific, acceptable repair practices to be incorporated into the repair of specific motors, and also note any exceptions to a common repair practice.
电机维修的质量取决于可供维修的设备的质量。从历史上看,并没有大量的信息可供服务中心使用,作为电动机维修的综合指南。机器的最终用户总是在寻找一种资源,一种可以作为维修基础的文件。EASA标准ANSI/EASA AR100-2001《旋转电气设备维修推荐规程》提供了重要指南;然而,它并没有深入到细节。去年,EASA发布了一份名为“机械维修基础”的详细指南。本书将电机分解为其机械部件,并为电机系统的每个部件提供具体的维修程序和提示。IEEE标准在整个文本中被引用。本文概述了“机械维修基础”及其结构。它可以被服务中心用作参考,并由最终用户帮助他们了解他们的电机是如何维修的。对最终用户的价值在于,他/她可以指导电机维修设施采用特定的、可接受的维修方法,以纳入特定电机的维修中,并注意常见维修方法的任何例外情况。
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引用次数: 0
Smart industrial substations - a modern integrated approach 智能工业变电站——一种现代化的综合方法
R. Cosse, J. Bowen, H.T. Combs, D. Dunn, M.A. Hildreth, A. Pilcher
What is a smart industrial substation? Does it enhance plant safety? Does it improve process reliability? Does it increase profits? How do I design a smart industrial substation? Do I already have most of the devices and components for retro-fitting existing equipment? These and other questions are discussed.
什么是智能工业变电站?它能提高工厂的安全性吗?它是否提高了过程可靠性?它能增加利润吗?如何设计智能工业变电站?我是否已经有了大部分的设备和组件来改造现有的设备?讨论了这些问题和其他问题。
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引用次数: 5
Proactive motor management can help reduce operating costs in the pulp and paper industry 主动电机管理可以帮助降低纸浆和造纸行业的运营成本
I. Mason, T. Jones
With the current economic climate putting a squeeze on capital budgets, now is the time to improve the efficiency and productivity of existing motor systems. According to a study by DOE, focusing on the efficiency of motor-driven equipment could add 5 percent to the operating margins of many pulp and paper mills. This paper provides both rationale and methods for realizing potential savings through sound motor management. It promotes the use of life cycle costing as a basis for making proactive repair/replace decisions. Results of a motor management project carried out at Crown Pacific Lumber are provided as an example.
随着当前的经济气候对资本预算的挤压,现在是时候提高现有电机系统的效率和生产力。根据美国能源部的一项研究,关注电机驱动设备的效率可以使许多纸浆和造纸厂的经营利润增加5%。本文提供了通过良好的电机管理实现潜在节约的基本原理和方法。它提倡使用生命周期成本作为制定主动维修/更换决策的基础。在皇冠太平洋木材公司进行的一个电机管理项目的结果是一个例子。
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引用次数: 2
Circuit breaker interrupting capacity and short-time current ratings 断路器的断流能力和短时额定电流
D.D. Roybal
Low-voltage circuit breakers have interrupting capacity ratings and short-time current ratings that an engineer uses for their application. Interrupting capacity and short-time current ratings define different circuit breaker performance characteristics. The short-time rating is used by the engineer to determine the ability of the circuit breaker to protect itself and other devices and to coordinate with other circuit breakers so the system will trip selectively. While interrupting capacity rating levels of circuit breakers are somewhat consistent throughout the electrical industry, short-time current rating levels are often inconsistent. It is important to understand the performance characteristics of the specific device in order to apply it properly. The present emphasis on higher interrupting ratings, current limiting, and series ratings has impacted the short-time current ratings of circuit breakers. This paper examines the interrupting capacity and short-time current ratings of molded-case circuit breakers, insulated-case circuit breakers, and low-voltage power circuit breakers and their effect on time-current coordination. It reviews resistive and reactive X/R ratios and explains the short-time current and instantaneous trip characteristics of microprocessor-based trip units. A good understanding of interrupting capacity and short-time current ratings allows the electrical engineer to make a proper comparison of various circuit breaker designs.
低压断路器具有工程师用于其应用的中断容量额定值和短时电流额定值。断流容量和短时电流额定值决定了断路器不同的性能特征。工程师使用短时额定值来确定断路器保护自身和其他设备的能力,并与其他断路器协调,使系统有选择地跳闸。虽然断路器的中断容量额定值在整个电气工业中多少是一致的,但短时电流额定值往往不一致。重要的是要了解具体设备的性能特征,以便正确地应用它。目前对高断流额定值、限流额定值和串联额定值的重视已经影响了断路器的短时额定值。本文研究了塑壳断路器、绝缘壳断路器和低压电力断路器的断流能力和短时电流额定值及其对时流协调的影响。它回顾了电阻和无功X/R比率,并解释了基于微处理器的跳闸单元的短时间电流和瞬时跳闸特性。对断流能力和短时电流额定值的充分理解,使电气工程师能够对各种断路器设计进行适当的比较。
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引用次数: 11
Protective devices maintenance as it applies to the arc/flash hazard 保护装置的维护,因为它适用于电弧/闪光危险
D. K. Neitzel
This paper addresses the basic requirements for protective devices maintenance and testing as recommended by the equipment manufacturers as well as several consensus standards. Proper maintenance and testing to assuring the reliability and integrity of electrical distribution systems, equipment, overcurrent protective devices, as well as the protection of equipment and people. However, preventative maintenance of electrical systems and equipment is often overlooked or performed infrequently. This paper will explore: Guides for electrical equipment and overcurrent protective device maintenance and testing. Analysis of various electrical equipment installations and the maintenance program practiced. Equipment damage and arc flash hazards with respect to preventative maintenance.
本文讨论了设备制造商推荐的保护装置维护和测试的基本要求以及几个共识标准。适当的维护和测试,以确保配电系统,设备,过流保护装置的可靠性和完整性,以及设备和人员的保护。然而,电气系统和设备的预防性维护经常被忽视或很少执行。本文将探讨:电气设备和过流保护装置的维护和测试指南。分析各种电气设备的安装和维修程序。预防性维护方面的设备损坏和电弧闪光危险。
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引用次数: 10
Primary high-current testing of relays with low ratio current transformers 采用低比电流互感器的继电器的一次大电流试验
S. Zocholl, J. Mooney
This paper will serve as one of few references describing primary high-current testing of protective relays using low ratio current transformers. The tests show the limitations of Fourier and cosine filters used in microprocessor relays that extract the fundamental phasors and eliminate harmonics. The tests validate the operation of a cosine-peak adaptive filter designed to cope with the highly distorted saturated waveforms produced by the low ratio CTs subjected to high current. The details of relay operation are shown in unfiltered event records of the test cases. A report is given on the results of primary high-current tests of overcurrent, motor, and distance relays using low ratio CTs. The test currents ranging from 6 kA to 50 kA were used with current transformers with ratios of 50:5, 300:5, and 600:5. The paper compares the internal unfiltered event records with MATLAB simulations of the same cases.
本文是介绍用小比电流互感器对继电器进行一次大电流试验的为数不多的参考文献之一。测试表明,用于微处理器继电器的傅立叶和余弦滤波器在提取基频和消除谐波方面存在局限性。实验验证了余弦峰值自适应滤波器的有效性,该滤波器设计用于处理由低比ct在大电流作用下产生的高度失真的饱和波形。继电器操作的细节显示在测试用例的未过滤事件记录中。本文报告了使用低比ct对过流、电机和距离继电器进行一次大电流试验的结果。测试电流范围从6 kA到50 kA,与50:5、300:5和600:5比例的电流互感器一起使用。本文将内部未滤波事件记录与相同情况下的MATLAB仿真结果进行了比较。
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引用次数: 5
Evaluation of torsional oscillations in paper machine sections 纸机截面扭转振动的评估
M. Valenzuela, J. Bentley, R. Lorenz
Torsional oscillations greatly affect performance and determine the bandwidth (BW) and damping of speed loops. Backlash due to gear reducers can also contribute to the triggering of oscillations, especially when the drive runs at very low load torque. This paper presents a detailed evaluation of these effects in typical electro-mechanical drive trains applied to paper machine sections. The cases evaluated consider torsional oscillations in two-mass and three-mass systems, and the effect of shaft diameter and length on the resonance frequencies of three typical paper machine sections. Time domain response plots are evaluated to show the effect of speed response overshoot, reducer backlash, and step or ramp speed commands. Based on these results, mechanical design guidelines are given for the most significant drive train components in order to minimize torsional oscillations of the speed controlled drive system.
扭转振荡对速度环的性能影响很大,并决定了速度环的带宽和阻尼。齿隙由于齿轮减速器也可以有助于触发振荡,特别是当驱动器运行在非常低的负载扭矩。本文详细评价了应用于纸机部件的典型机电传动系统的这些影响。评估的案例考虑了两质量和三质量系统的扭转振荡,以及轴直径和长度对三种典型造纸机部分共振频率的影响。时域响应图评估,以显示速度响应超调,减速器间隙,步进或斜坡速度命令的影响。基于这些结果,给出了最重要的传动系部件的机械设计准则,以尽量减少速度控制传动系统的扭转振荡。
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引用次数: 0
Tuning a PID controller for a digital excitation control system 对数字励磁控制系统的PID控制器进行整定
Kiyong Kim, R. Schaefer
Some of the modern voltage regulator systems are utilizing the proportional, integral and derivative (PID) control for stabilization. Two PID tuning approaches, pole placement and pole-zero cancellation, are commonly utilized for commissioning a digital excitation system. Each approach is discussed including its performance with three excitation parameter variations. The parameters considered include system loop gain, uncertain exciter time constants, and forcing limits. This paper is intended for various engineers, and technicians to provide a better understanding of how the digital controller is tuned with the pros and cons for each method.
一些现代稳压器系统正在利用比例、积分和导数(PID)控制来实现稳定。两种PID整定方法,极点放置和极点零抵消,通常用于调试数字励磁系统。讨论了每种方法在三种激励参数变化下的性能。所考虑的参数包括系统环路增益、不确定激励时间常数和强迫极限。本文旨在为各种工程师和技术人员提供更好的理解数字控制器如何与每种方法的优缺点进行调谐。
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引用次数: 28
期刊
Conference Record of 2004 Annual Pulp and Paper Industry Technical Conference (IEEE Cat. No.04CH37523)
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