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Capstone Turbine Corporation 21211 Nordhoff Street Chatsworth CA 91311 USA Technical Reference: Dual Mode System Controller (DMSC) inactive, and the GC Enable signal is activated through auxiliary switch M1-A2, acting through relay RL8 (refer to Figure 30). These inputs cause the MicroTurbine to begin the reconnect sequence to Grid Connect mode while the utility grid powers the protected load. Figure 31 shows the timeline for this sequence, if the Fast Transfer Delay time is set to its default value of 0. Note that the total time the protected load is without normal voltage is typically less than 10 seconds after the initial utility fault, and less than 5 seconds when the DMSC transfers back to utility Grid Connection (remote disconnect device closes). Utility faults can occur for many reasons, resulting in a variety of transient voltage conditions. The most frequent faults are sags of relatively short duration due to short circuits on the distribution network. Depending on the impedance of the short circuit and its distance from the MicroTurbine, the resulting voltage sags are often less than one (1) second, and quickly return to normal voltage when re-closing devices isolate the faulted feeder. For this reason, Capstone has designed the DMSC control logic and coordinated the DMSC UVR with the MicroTurbine’s internal protective relay so that the DMSC only opens for more severe faults. Figure 32 shows how the DMSC’s UVR and the MicroTurbine’s undervoltage settings can be 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 DMSC to open the remote disconnect device. In this case, the protected load will only see the utility voltage sag, and no interruption (and no Fast Transfer) will occur. Figure 33 shows a timeline of this scenario. Utility Voltage Protected Load Voltage DMC Switch M1 GC Enable SA Enable Start/Stop SALoad(AtoB) MicroTurbine Output MicroTurbine State Off Typically < 10 s Off Normal Utility Fault DMC Control Actions < 7 s Utility Returns 1 min M1 Closes < 2 s Off 5 - 30 min Normal Closed Active Stop Reconnect Time Delay Fault Fault Normal Normal Closed Active Inactive Stop Inactive (Open) MT Fault Detection Grid Connect Normal UVR Fault Detection opens M1 Open Inactive Active Start Transition to Stand Alone Inactive Fixed Time Delay Inactive (Open) Active (Closed) 410071 Rev. B (January 2009) Hot Standby Stand Alone Hot Standby Grid Connect Page 64 of 71 Figure 31. Fast Transfer with DMSC – GC to SA to GC Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | TECH REF DMSC RB
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