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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Dual Mode System Controller (DMSC): User’s Manual Safety Interlocks In a Dual Mode installation, the MicroTurbine has a set of safety interlocks designed to prevent the unit from operating in Stand Alone when connected to the utility. These interlocks interface with an auxiliary contact of the remote disconnect device to isolate the MicroTurbine from the utility (see Figure 2). Utility companies are concerned that utility worker safety may be compromised if they come in contact with a de-energized line section that becomes energized by a distributed or standby generator. When operating in Grid Connect mode, the MicroTurbine contains protective relay functions to ensure that the unit does not energize the utility lines unless the frequency and voltages on each phase are within operating limits defined in the interconnection agreement with the utility. These protective functions are designed to prevent a MicroTurbine operating in Grid Connect mode from energizing a line that has been de-energized by the utility. When operating in Stand Alone mode, the MicroTurbine is designed to be the sole source of power in the local power system comprising MicroTurbines and the protected loads. In this mode, a MicroTurbine is capable of energizing a de-energized power system. Therefore, it is important that the MicroTurbine is always operating in Grid Connect mode when running in parallel with the utility and should only be operated in the Stand Alone when it is isolated from the utility. The DMSC provides a second level of interlock that operates independently from an auxiliary contact-based interlock. In this interlock level, a solid-state relay in the User Connection Bay (UCB) of a MicroTurbine is programmed to close when a MicroTurbine enters the Stand Alone Load state. When the relay closes, it immediately energizes the shunt trip of a remote motor- operated disconnect device and removes power to the motor operator, keeping the disconnect device in the open state. In a MultiPac system, the interlocks are only required on the master MicroTurbine. The master communicates the status of the interlocks and the operating mode to the subordinate MicroTurbines. If communication fails to a subordinate unit, the subordinate will shut down. 400023 Rev A (October 2008) Page 11 of 27 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) USER’S MANUAL
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