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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Protective Relay Functions for Capstone MicroTurbines The Power Controller does not include overcurrent protection, but does provide extremely fast current limiting. The Power Controller output acts as a current source, using the grid voltage as a reference for both magnitude and phase angle. Active current control ensures that the steady-state current will not exceed 46A (Model C30) or 105A (Model C60/C65) per phase, regardless of the utility voltage. Under transient or fault conditions, active current control and sub-cycle current interruption capability ensure that the RMS current in any half cycle does not exceed 58A RMS for the Model C30 or 145A RMS per phase for the Model C60/C65. For some severe transients, the inverter may shut down within 1 or 2 cycles due to excessive or unstable current. Even under these conditions, the RMS current in any half cycle will not exceed 58A RMS (Model C30) or 145A RMS (Model C60/C65) per phase. For less severe transients, the active current control will maintain the current at a value not more than 46A (Model C30) or 105A RMS (Model C60/C65) per phase. The Power Controller will continue to operate in this mode until some other protective function stops power flow. For example, the Fast Under Voltage protective function can be set to detect a reduced utility voltage and initiate a Grid-Fault Shutdown within 2 cycles. It is essential for safe operation and service that a current limiting disconnect device (breaker or fused disconnect) be installed between the Power Controller and the utility grid. The disconnect device must be rated for the total fault current. Local electric codes will almost always require such a disconnect. The added protection of this disconnect device is not considered here. Reverse Power Flow (Protective Function 32) The Power Controller may be programmed to initiate a Normal Shutdown upon detection of reverse power flow at a remote location by installing a pulse-issuing power meter at a remote location between the utility service entrance and the point where the MicroTurbine is connected. Detailed requirements for this installation are described in the Grid Connect Operation Technical Reference (410027). As shipped, the Reverse Power Protective function in the Power Controller is not enabled. It may be enabled at installation. When enabled, the Reverse Power Flow Protective function will initiate a Normal Shutdown when reverse power flow is measured for a duration of 120 seconds. This duration may be adjusted downwards to 0 second. Note that a duration of zero (0) seconds cannot be realistically achieved. The minimum duration depends on the kWh per pulse calibration factor of the power meter and the magnitude of the reverse power flow. In practice, if the duration is set as 0 second, the shutdown will be initiated when the first reverse power flow pulse is received. Alternatively, a reverse power flow relay may be interfaced with the external fault inputs to initiate a Grid Fault Shutdown when reverse power flow is detected. 410033 Rev. D (February 2006) Page 9 of 10 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 specifications, 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 | Technical Reference Protective Relay Functions for Capstone MicroTurbines
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