網(wǎng)絡(luò)互動營銷的幾個關(guān)鍵點-文庫吧資料
2025-02-11 10:25本頁面
【正文】 ootprint constraints? Sectionalizing requirements to avoid exceeding breaker fault duties? Ease of future bus expansionBus arrangements? Single bus? Main and transfer bus? Doublebus doublebreaker? Doublebus singlebreaker? Breakerandahalf? Ring busMain and transfer busMain and transfer busIntroduction to bus protection? Zones of protection? Bus protection methods? Scheme selection guidelinesZones of protectionDynamic zones of protectionDynamic zones of protectionDynamic zones of protection Zones of protectionBus protection methods? Differential– Differentiallyconnected overcurrent? Instantaneous? Timedelayed– Percentagerestrained differential? Restrained? Advanced microprocessor based– Highimpedance differential? Resistorstabilized overcurrent? Highimpedance– Partial differential overcurrent– Fault busBus protection methods? Zoneinterlocked schemes– Simple blocking– Directional blocking? Timecoordinated relays overlapping the bus? Protection (sensors) built into the gas isolated switchgear** Not covered in the GuideScheme selection criteria? Bus arrangement and flexibility– Fixed vs. switchable buses? Availability and characteristics of CTs? For reconfigurable buses, availability of auxiliary contacts of disconnect switches? Performance requirements– Security, Selectivity, Speed, Sensitivity? Cost and plexityScheme selection Relay input sources? Current transformers– Types– Accuracy classes– Equivalent circuit time to saturation– No universal CT requirements? Voltage Transformers– Voltage trip supervision–
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