继电保护选择的应用指导毕业外文翻译

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1、 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

2、 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 tr

3、ansfer and fast clearing times to improve/ensure system stability). The optimization of the power systems 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 per

4、formance 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 l

5、ed 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

6、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 such as the

7、RMS, RMSD, RMSR, IMM, GMS and DMS relays, the PROCOM range also includes the CMS digital instrumentation units, AMS local PLCs and PMG. It is therefore possible, by selecting the appropriate combination of units, to define a complete circuit breaker local management system including Protection, Auto

8、mation and Instrumentation. Nowadays, the difficult economic environment within the industry is imposing increasing demands on efficiency by reducing operating and maintenance costs. At the same time, improvements are required in the continuity and quality of supply, together with personnel and equi

9、pment safety. With these trends in mind, CEE has recently developed the PROSATIN range of equipment, which combines the capabilities of the PROCOM range with that of the MicroSATIN range to provide the complete Integrated Protection, Supervision and Remote Control of Electrical Power Networks. The P

10、ROSATIN systems therefore provide full SCADA function for Electrical Power Networks, combining the following functions: Protection Supervision (Measurements, Alarms, Data Logging and Mimic Diagrams) Control (Local or remote by VDU) PROSATIN reduces costs and improves continuity of supply by: Reducin

11、g the time to check and analyse the power system operational status of parameters, Increasing preventative maintenance by automatic and continuous supervision including auto-diagnosis, Optimisation of energy costs, and Improvements in operational procedures and maintenance leading to reduced downtim

12、es. In order to be adaptable to varying degrees of user needs, PROSATIN is available in the following sub-systems: PS1000: Simple supervisory systems based on desktop PCs intended for use in relatively small electrical networks. PS2000: SCADA system with time logging for industrial plants and distribution networks. PS4000: Complete high-speed SCADA system for industrial plants. The selection of protection relays therefore depends upon the answer to two basic questions: