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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Grid Connect Operation – Capstone Models C30 and C60/C65 Programming the Meter Scaling Constant Each power meter has an internal calibration factor supplied with the electronics. This internal calibration factor may have to be modified by multiplicative factors associated with the current and potential transmitters employed between the power meter and the power wiring. Thus, the overall calibration factor seen by the MicroTurbine is as follows: Ke =Kh /I(P/R)*CTR*PTR/DIV where: Ke = Scaling constant for pulses entering the MicroTurbine terminals, W-h/pulse Kh = A typical Kh is 1.8 W-Hr per revolution; power meter internal calibration factor, W-h/revolution (usually found on meter face). CTR = Current transformer ratio (current at power meter /current in lines); Example: A 2000A to 5A current transformer would have a CRT of 2000/5 = 400 PTR = Potential transformer ratio (voltage at power meter / voltage at bus). DIV = Any other division ratio applicable to the power meter; Example: A 480V to 120V potential transformer would have a PTR of 480/120 = 4 P/R = Pulse per revolution (usually found on meter face) Ke is the scaling constant that should be entered into the display controller. The power meter internal calibration factor, current transformer ratio and voltage transmitter ratio must be such that the scaling constant falls in the range 0 – 500.000 W-h/pulse. Protective Relay Settings The MicroTurbine software supports undervoltage, overvoltage, and frequency protection limits in accordance with UL 1741. Refer to the Protective Relay Technical Reference (410033) for details. 410027 Rev F (February 2006) Page 22 of 23 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 product 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 | TECH REF C30 Grid Connect Op
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