本文概述了气密电机压缩机保护系统的历史，包括整体马力大小、电机发展、操作系统中发现的故障情况以及保护系统的动作。目的是让没有机会在这方面密切合作的工程师熟悉此类系统操作和保护的复杂性。本文介绍的经验是使用低压侧外壳、内部弹簧安装和往复式电机压缩机。这并不是一个系统设计或应用的食谱方法。 术语“保护系统”可以被认为是一个整体系统，使用多个独立运行的组件或单个集成系统。根据经济性、安全性、规范、认证机构要求等，在设计中可以考虑对尽可能多或尽可能少的故障条件进行保护。为了便于讨论，本文列出了空气源热泵运行中可能发现的一些重要故障条件。引文:研讨会，ASHRAE交易，第87卷，第一部分，伊利诺伊州芝加哥

The purpose of this paper is an overview of the history of protection systems for hermetic motor-compressor in the integral horsepower sizes, touching on motor developments, fault conditions found in operating systems, and action of protection system. The intent is to familiarize the engineer who has not had an opportunity to work closely with this aspect with the complexity of operation and protection of such a system. The experience described in this paper is with the low side case, internally spring mounted, and reciprocating motor-compressor. This is not intended to be a cookbook method of system design or application.The term "protection system" can be thought of as an over-all system using several components acting independently or a single integrated system. Protection for as many or as few fault conditions as can possibly exist can be considered in a design depending on economics, safety, specifications, approval agency requirements, etc. For the purpose of discussion, some important fault conditions which may be found in air source heat pump operation are listed in this paper.