Transcription of CHAPTER – 3 ELECTRICAL PROTECTION SYSTEM
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CHAPTER – 3 ELECTRICAL PROTECTION SYSTEM
105 CHAPTER 3 ELECTRICAL PROTECTION SYSTEM DESIGN CONSIDERATION PROTECTION SYSTEM adopted for securing PROTECTION and the PROTECTION scheme the coordinated arrangement of relays and accessories is discussed for the following elements of power SYSTEM . i) Hydro Generators ii) Generator Transformers iii) H. V. Bus bars iv) Line PROTECTION and Islanding Primary function of the protective SYSTEM is to detect and isolate all failed or faulted components as quickly as possible, thereby minimizing the disruption to the remainder of the electric SYSTEM . Accordingly the PROTECTION SYSTEM should be dependable (operate when required), secure (not operate unnecessarily), selective (only the minimum number of devices should operate) and as fast as required.
interruption. Circuit breakers offer considerable flexibility and are available in variety of voltage, current, and fault current interrupting ratings. High-voltage circuit breakers are equipped with separate electrically operated close and trip coils that can be controlled by any required protection and control package. Low-
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