tailieunhanh - Diesel Electric Generator Plants_5

Tham khảo tài liệu 'diesel electric generator plants_5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | MIL-HDBK-1003 11 Simpo PDF Merge and Split Unregistered Version - http c Bus voltmeter. d Incoming voltmeter. Permissive Control. Local policy synchronization may dictate the use of a permissive type synchronism check relay ANSI Device 25 which is provided in series with the synchronizing switch to prevent closure when the two sources are too far out of synchronization. This devices checks voltage on both sides of a circuit breaker this providing protection against operating errors. System Monitoring. System monitoring is provided to aid the operator in avoiding system abnormalities. The amount of reporting alarming and control can vary from alarms reporting there is a problem at a certain location or reporting only of electrical quantities and control as previously discussed to complex microprocessor-based Supervisory Control and Data Acquisition Systems SCADA . Type of System. The operating duties of the plant should be considered in system selection. Large prime duty plants in remote locations or cogeneration plants may require SCADA. Where plants are continuously manned requiring only the minimum monitoring is usually adequate refer to Section 1 NFGS specifications. SCADA. This system provides a master station which utilizes input from equipment-mounted field interface panels normally in conjunction with a record-keeping printer. The selected reporting alarm and control functions should consider those required for Energy Management Control systems EMCS either by utilizing an existing EMCS or providing a new system. Generator Protection. Surge protection neutral grounding and protective relays are used to protect the system from electric power system disturbances whose abnormality could damage equipment or harm personnel. Surge Protection. Some form of surge protection is usually necessary within a generator plant. Surge arresters in parallel with surge protective capacitors may need to be installed at the .