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首页> 外文会议>Petroleum and Chemical Industry Conference >ELECTRONIC MOTOR CIRCUIT PROTECTORS: A fresh perspective on sizing circuit protection for branch motor circuits in a low voltage motor control center
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ELECTRONIC MOTOR CIRCUIT PROTECTORS: A fresh perspective on sizing circuit protection for branch motor circuits in a low voltage motor control center

机译：电子电机电路保护器：低压电机控制中心分支电机电路施胶电路保护的新视角

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Motor circuits have a dynamic load profile that creates a fine line between acceptable inrush currents and damaging short circuits. Achieving a proper balance of protection, along with gaining National Electrical Code compliance can be a delicate balance. The setting of the Motor Circuit Protector can lead to decisions between limiting the potential of a nuisance trip on start-up versus providing an optimal setting to protect an electrical motor. Circuit breakers equipped with electronic trip systems have become a critical part of protecting electrical systems. This technology is well suited for applications that require adjustments to properly align trip curves with specific devices or to properly coordinate with other circuit breakers. Motor control applications have a unique load profile and are ideally suited for electronic trip unit technology. This technology can be referenced as an Electronic Motor Circuit Protector. This circuit breaker utilizes an internal microprocessor that is programmed with specific trip characteristics to protect an electric motor and align with the setting requirements based on the National Electric Code Table 430.52 for the maximum setting of branch motor protective devices. An evaluation of the time-current characteristics of motor start-up will be examined while comparing motor protection offered by both electro-mechanical motor circuit protectors and electronic motor circuit protectors. There will be a review of the requirements of the National Electric Code Table 430.52 and a discussion of several common mistakes people make when setting branch motor circuit protection which are: (1) significance of motor full load currents; (2) not accounting for energy-efficient motors; (3) overlooking heavy service applications; (4) missing the short circuit current ratings. Data results from a field survey are included which also illustrate the need for a simpler, more flexible solution for protecting your motor branch circuit.
机译：电动机电路具有动态载荷轮廓，可在可接受的浪涌电流和损坏短路之间产生细线。实现适当的保护平衡，以及获得的国家电气代码合规性可以是一个微妙的平衡。电动机电路保护器的设定可以在限制启动时限制滋扰的电位与提供最佳设置以保护电动机之间的决定。配备电子跳闸系统的断路器已成为保护电气系统的关键部分。这项技术非常适合需要调整以适当地对准具有特定设备的跳闸曲线或与其他断路器正确坐标的应用程序。电机控制应用具有独特的负载型材，非常适合电子跳闸单元技术。该技术可以称为电子电机电路保护器。该断路器利用内部微处理器，其具有特定跳闸特性，以保护电动机，并根据国家电气代码表430.52为分支电动机保护装置的最大设置对齐。在比较由机电电动机电路保护器和电子电动机电路保护器提供的电动机保护时，将检查电机启动时电流特性的评估。将审查国家电气代码表430.52的要求，并在设定分支电机电路保护时进行几个常见错误的讨论，这是：（1）电机满负荷电流的重要性; （2）不占节能电机; （3）俯瞰重型服务应用; （4）缺少短路电流额定值。包括现场调查的数据，其中还说明了对保护电机分支电路的更简单，更灵活的解决方案。

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