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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Dual Mode Fast Transfer Application Guide to normal voltage when reclosing devices isolate the faulted feeder. For this reason, Capstone has designed the DMC control logic and coordinated the DMC UVR with the MicroTurbine’s internal protective relay so that the DMC only opens for more severe faults. Figure 10 shows how the DMC’s UVR and the MicroTurbine’s undervoltage settings are coordinated so that the MicroTurbine will be the first to respond. This means that there will be some situations where a fault is just a temporary voltage sag that causes the MicroTurbine to automatically disconnect, but does not persist long enough to cause the DMC to open the isolation switch M1. In this case, the protected load will only see the Utility voltage sag, and no interruption (and no Fast Transfer) will occur. Figure 11 shows a timeline of this scenario. Utility Fault DMC Control Actions Utility Returns 1 min M1 Closes < 2 s Off Fault Fault < 7 s 5 - 30 min Normal Closed Active Stop Reconnect Time Delay Hot Standby Normal Normal Closed Active Inactive Stop Inactive (Open) MT Fault Detection Grid Connect Normal Utility Voltage Protected Load Voltage DMC Switch M1 GC Enable (2 to grd) SA Enable (3 to grd) Start/Stop (4 to grd) SA Load (A to B) MicroTurbine Output MicroTurbine State Off Typically < 10 s Off Normal UVR Fault Detection opens M1 Open Inactive Active Start Transition to Stand Alone Inactive Fixed Time Delay Inactive (Open) Active (Closed) Hot Standby Stand Alone Grid Connect Figure 9. Fast Transfer with DMC - GC to SA to GC 480011 Rev B (February 2006) Page 11 of 14 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment ratings, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Application Guide - Model C60/C65 Dual Mode – Fast Transfer
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