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Guide to design E Motor protection and control - selection of short circuit protective devices and motor controllers used with design B, C, D, or E motors

机译:设计E电动机保护和控制指南-选择与B,C,D或E设计电动机一起使用的短路保护装置和电动机控制器

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摘要

The 1996 National Electrical Code (atticle 430-7(9)) introduced the Design E motor to the Electrical Industry. A new motor designation was necessary because the Design E motor has higher efficiency, higher locked rotor current, and reduced torque requirements compared to existing NEMA motor designs. The purpose of this guide is to give users of Design E motors electrical application information concerning the selectionof the appropriate motor disconnecting means, motor branch-circuit short-circuit protection, motor circuit conductor, motor controller, and motor overaloed protection, and guidance concerning torque characteristics. Design E motors provide increased energy savings that are improtant to many users. But, the possible additional costs of protective and control equipment as well as more horseposer must be part of a cost savings calculations. This guide describes how motor efficiency is increased and how the design changes related to invreased efficiency affect the mechanical and electrical characteristics of motors. THis guide reviews the requirements of Article 430 of the 1996 National Electrical Code and provides generic application tables that compare the protection and control requirements of Design E motors with those of Design B,C, and D.
机译:1996年的《国家电气法规》(第430-7(9)条)将Design E电动机引入了电气行业。与现有的NEMA电机设计相比,Design E电机具有更高的效率,更高的转子堵转电流和更低的扭矩要求,因此有必要使用新的电机名称。本指南的目的是为设计E电机的电气应用用户提供有关选择合适的电机断开装置,电机支路短路保护,电机电路导体,电机控制器和电机过分保护的信息,以及有关转矩的指南特征。 Design E电动机可提高节能效果,这对于许多用户而言是至关重要的。但是,保护和控制设备以及更多马具的可能附加成本必须作为成本节省计算的一部分。本指南介绍了如何提高电机效率以及与效率提高相关的设计更改如何影响电机的机械和电气特性。本指南回顾了1996年《国家电气法规》第430条的要求,并提供了通用的应用表,这些表将Design E电动机与Design B,C和D的保护和控制要求进行了比较。

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