Vintage Low-Voltage Motor Control Centers – Replace or Upgrade?

2019 IEEE-IAS/PCA Cement Industry Conference (IAS/PCA) Pub Date : 1900-01-01 DOI:10.1109/citcon.2019.8729108

D. Durocher, M. Hussey

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引用次数: 3

Abstract

Low-voltage motor control centers are universally applied in process industries. These electrical assemblies are perhaps one of the most dynamic in industry, ever changing as low-voltage motor loads are constantly added and modified in response to necessary process revisions and upgrades. As existing low-voltage motor control centers (MCCs) approach 40 to 50 years age, industry users are challenged with a decision to replace vintage MCCs approaching their end of life, or consider upgrade of existing assemblies. This paper will discuss upgrade versus replace alternatives, addressing UL 845 North American industry standard requirements and how this affects design, installation and maintenance of both upgraded and new MCCs. Application issues including considering the cost of replacing load cables versus re-use of existing cables, high-resistant pulsing ground systems and opportunities for process improvements and network communications that leverage the latest technology will be discussed. Finally, a case study comparing the alternative of replacing an existing MCC versus a field upgrade based on changing out all exiting starter and feeder circuit breaker units and an estimate of the total installed cost for both MCC replacement and upgrade for this application will be reviewed.

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老式低压电机控制中心——更换还是升级?

低压电机控制中心在过程工业中有着广泛的应用。这些电气组件可能是工业中最具活力的组件之一，随着低压电机负载的不断增加和修改，以响应必要的工艺修订和升级而不断变化。随着现有的低压电机控制中心(mcc)接近40至50年的使用年限，行业用户面临着更换接近使用寿命的老式mcc或考虑升级现有组件的决定的挑战。本文将讨论升级与替换替代方案，解决UL 845北美工业标准要求，以及这如何影响升级和新mcc的设计，安装和维护。将讨论应用问题，包括考虑更换负载电缆的成本与重新使用现有电缆、高电阻脉冲接地系统以及利用最新技术进行流程改进和网络通信的机会。最后，将对更换现有MCC与更换所有现有启动器和馈线断路器进行现场升级的选择进行案例研究，并对该应用中更换和升级MCC的总安装成本进行评估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 IEEE-IAS/PCA Cement Industry Conference (IAS/PCA)

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