Adding life and safety to existing substations

2012 Petroleum and Chemical Industry Conference (PCIC) Pub Date : 2012-09-01 DOI:10.1109/PCICON.2012.6549664

M. A. Metzdorf, M. C. Martín, J. Webb

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引用次数: 2

Abstract

This paper will discuss a set of projects in a large US chemical manufacturing facility which lowered the arc flash incident energy at several 480-volt switchgear lineups and extended the life of the equipment through the installation of retrofit circuit breakers. After the arc flash hazard study was completed at the facility, it was found that many 480-volt, 1000 kVA substation switchgear lineups had incident energy levels well above safe working conditions. Additionally, with major unit outages approaching, it was desired to find a cost-effectively way to extend the life of the existing, 35-year old equipment. Through analysis and field trials it was determined that the upstream fuses could be replaced with a lower rating and significantly reduce the arc flash incident energy to within acceptable levels. Additionally, a retrofit circuit breaker was found which did not require any physical modifications to the switchgear and provided a new breaker in place of the old equipment. The advanced features of the new breaker trip unit allows personnel to activate an alternate trip setting which lowers the downstream arc flash incident energy on the motor control centers to minimal levels allowing less protective equipment when performing common energized tasks. Finally, with the addition of electrical control, personnel are able to operate the new breakers remotely outside of the arc flash hazard boundary.

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增加现有变电站的寿命和安全性

本文将讨论美国一家大型化工工厂的一系列项目，这些项目降低了几个480伏开关柜的电弧闪射入射能量，并通过安装改造断路器延长了设备的寿命。在该设施完成弧闪危害研究后，发现许多480伏，1000千伏安变电站开关柜的事故能量水平远高于安全工作条件。此外，随着主要机组停产的临近，希望找到一种经济有效的方法来延长已有35年历史的设备的使用寿命。通过分析和现场试验，确定可以用较低额定值替换上游熔断器，并显着将电弧闪光入射能量降低到可接受的水平。此外，发现了一个改造断路器，它不需要对开关设备进行任何物理修改，并提供了一个新的断路器来代替旧设备。新型断路器跳闸装置的先进功能允许工作人员激活备用跳闸设置，将电机控制中心的下游电弧闪光入射能量降低到最低水平，从而在执行常见带电任务时减少保护设备。最后，随着电气控制的增加，工作人员能够在电弧闪光危险边界之外远程操作新的断路器。

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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2012 Petroleum and Chemical Industry Conference (PCIC)

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