220kv變电所电器二次部分毕业设计论文翻译.docVIP

英文翻译(译文) 英 文 名 称Application guide for the choice of protective relays 中 文 名 称 继电保护选择的应用指导 学 生 姓 名 学 号 系、年级专业 电气工程系、10电气工程及其自动化 指 导 教 师 职 称 2014年 1 月 20 日 Application guide for the choice of protective relays 1. INTRODUCTION Protective Relays are the brain of the electrical apparatus. In this respect, their choice is a critical step in the The selection of protective devices is based on: The safety of personnel and equipment (sensitivity of detection and response time). The quality and continuity of the electrical supply (fault determination, special directional protection, automatic transfer and fast clearing times to improve/ensure system stability). The optimization of the power system’s reliability and safety dictates the use of independent stand-alone relays located close to the power circuit breakers that they control. In some cases, improvements in the overall protection performance are possible by transmitting the relay status to a remote location (known as important to ensure that these additional functions do not jeopardise the inherent integrity In recent years, technological progress has led to the use of microprocessors in protective relay manufacture. This has led to: A significant increase in the amount of information that is processed by the relays. Easy calculation of electrical quantities such as harmonics. Secure and reliable exchange of digital information with remote locations. Continuous monitoring of protection relay integrity by self-supervision and auto-diagnostics. CEE have developed the PROCOM range of digital protection relays, which benefits from the above advantages without sacrificing the stand-alone capability of the classical solid state relays such as the ITG and TTG series. In addition to the PROCOM protection relays