PDF Publication Title:
Text from PDF Page: 063
Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) and the GC Enable signal is activated through auxiliary switch M1-A2, acting through relay RL8 (refer to Figure 27). These inputs cause the microturbine to begin the reconnect sequence to Grid Connect mode while the utility grid powers the protected load. Figure 28 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 29 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 30 shows a timeline of this scenario. Utility Fault DMC Control Actions Utility Returns < 7 s Open M1 Closes 5 - 30 min Normal Closed 0 - 30 min Normal <2s Off Utility Voltage Protected Load Voltage Switch M1 GC Enable SA Enable Start/Stop SA Load (A to B) MicroTurbine Output MicroTurbine State Normal Normal Closed Fault Fault Typically<10 s Off Normal UVR Fault Detection opens M1 Inactive Active Active Inactive Stop Inactive (Open) MT Fault Detection Grid Connect Active Start Transition to Stand Alone Inactive Stand Alone Load Wait Inactive (Open) Stop Reconnect Time Delay Active (Closed) Hot Standby Stand Alone Hot Standby Grid Connect Page 63 of 71 Figure 28. Fast Transfer with DMSC – GC to SA to GC 410071 Rev D (January 2010) 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 | Dual Mode System Controller DMSC
PDF Search Title:
Dual Mode System Controller DMSCOriginal File Name Searched:
410071D_Dual_Mode_System_Controller_DMSC_TR.pdfDIY PDF Search: Google It | Yahoo | Bing
Capstone Turbine and Microturbine: Capstone microturbines used and new surplus for sale listing More Info
Consulting and Strategy Services: Need help with Capstone Turbine, sizing systems, applications, or renewable energy strategy, we are here to assist More Info
Container Lumber Dry Kiln: Since 1991 developing and innovating dry kilns using standard shipping containers More Info
Supercritical CO2 Lumber Dry Kiln: Compact fast drying in 3 days or less for small amounts of wood and lumber drying More Info
BitCoin Mining: Bitcoin Mining and Cryptocurrency... More Info
Publications: Capstone Turbine publications for microturbine and distributed energy More Info
FileMaker Software for Renewable Energy Developing database software for the renewable energy industry More Info
CO2 Gas to Liquids On-Demand Production Cart Developing a supercritical CO2 to alcohol on-demand production system (via Nafion reverse fuel cell) More Info
Stranded Gas for low cost power Bitcoin Mining Using stranded gas for generators may provide breakthrough low power costs for cryptocurrency miners. More Info
| CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com | RSS | AMP |