摘要
自动切断电源是起重机间接接触防护中最常用的措施,采用自动切断电源这种防护措施需协调三方面的要求:电源接地系统型式、不同地基的保护联结系统的接地阻抗值和检测绝缘故障保护器件的特性。正确判别起重机电源接地型式是对起重机接地检验首要的任务,本文对判别各种接地型式的方法进行了详细的介绍,并指出了起重机接地的常见误区以及正确的处理措施。
Protection by automatic disconnection of power supply is the most commonly used measure of protection against indirect contact for cranes, protection by automatic disconnection of power supply necessitates coordination between： the type of supply and earthing system, the impedance values of the different elements of the protective bonding system, and the characteristics of the protective devices that detect insulation faults. Correct identification of the type of supply and earthing system is the primary task of the crane earthing test. In this paper, we introduce the method to distinguish various earthing types, and point out the common mistakes and correct handling measures of crane earthing.
出处
《中国特种设备安全》
2016年第7期50-53,70,共5页
China Special Equipment Safety
关键词
起重机
接地系统
间接接触防护
电击防护
TN系统
TT系统
Crane
Earthing system
Protection against indirect contact
Protection against electric shock
TN system
TT system
