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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) Considerations for Circuit Breaker Type Remote Disconnect Device The DMSC opens the remote disconnect device (M1) by energizing the shunt trip on the disconnect device, which moves it to the TRIP position. The TRIP position is the normal state for Stand Alone mode operation. Once the utility voltages return to the normal range, the DMSC de-energizes the shunt trip and transitions the remote disconnect device from the TRIP position, via the OFF position, to the ON position. This recloses the remote disconnect device from the TRIP position. If disconnect device M1 is a circuit breaker, it contains an over-current trip unit that operates in the case of an over-current condition. An over-current condition will occur if there is a low impedance fault in the Protected Load or microturbine circuits. The over-current mechanism operates by transitioning the circuit breaker to the TRIP position. Typically, once a circuit- breaker is in the TRIP position it gives no direct indication of whether the trip was caused by the shunt-trip or by the over-current trip. The DMSC is designed to automatically reclose the remote disconnect device from the TRIP position when the utility voltage is in the acceptable range. This is the correct and desirable behavior when the disconnect device was tripped by the DMSC logic via the shunt trip. However, it is not desirable to reclose the disconnect device if it was tripped by the over-current unit. In this case, there may be a persistent fault in the circuits served by the disconnect device. The reclosure of the disconnect device will cause the fault to be re-energized. This may increase the hazard associated with the fault and is likely to result in a cyclic tripping/reclosing of the disconnect device. This is stressful for the disconnect device and may result in premature failure. The DMSC contains a reclose lock-out circuit using a latching relay (LRL1) to prevent the automatic reclosure of the remote disconnect device unless a shunt-trip action has been performed. In normal operating conditions, this prevents automatic reclosure of the disconnect device after it has been tripped by the over-current unit. The reclose lock-out circuit also prevents automatic reclosure of the disconnect device if it was tripped manually or opened manually. When utility power is restored, the disconnect device will not be closed and the REMOTE TRIP indicator lamp (LP6) will illuminate. If the REMOTE TRIP lamp is illuminated, the DMSC can only close the remote disconnect device after the MANUAL RESET button (S3) has been pressed. A manual close of the remote isolation switch should only be performed if a qualified person has determined that there are no persistent electrical faults in the circuits served by the remote disconnect device. Coordination with M1 Circuit Protective Functions The DMSC opens or closes motor-operated remote disconnect device (M1) based on the utility grid voltage sensed with its UVR and the associated logic in the DMSC as well as the connected microturbines. If disconnect device M1 is an motor-operated switch without integral circuit protection functions of its own, then the only coordination required is to make sure that the switch fault current withstand rating is above the worst case short circuit fault current that the utility grid can provide. However if M1 is a circuit breaker, or can be tripped from an external protective relay or other fault measuring device, then additional considerations are required to assure overall coordinated system operation. 410071 Rev D (January 2010) Page 27 of 71 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
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