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PRELIMINARY High Supply Impedance Applications High Supply Impedance Applications Applications with high supply impedance lines may experience voltage rise at the Capstone 60 exceeding its trip point. To prevent the overvoltage, a transformer with adjustable tap settings must be used to lower the voltage to the Capstone 60. Adjustable Tap Settings If the Capstone 60 shuts down due to an over voltage event, adjustable tap settings may be used to lower voltage to the Capstone 60. The following procedure may be used to determine the adjustable tap setting. 1. Before starting the Capstone 60, measure the three line-to-neutral utility voltages. Average these 3 voltages for VU. 2. Operate the Capstone 60 at a power level slightly below the power that caused an over-voltage fault and record the 3 output line-to-neutral voltages and currents. Calculate the average value of the 3 voltages and currents for Vmt and imt 3. Calculate the resistance component of the imped- ance, R = (Vmt - VU) / imt (ohms) For nominal 480V output, the maximum Capstone 60 current output at 65.5 kW is 79A. The full output Capstone 60 voltage is calculated to be: Vmtfl = 480 + 79*(R)*3(1/2) (Volts RMS) The resultant adjustable tap setting is: Vtap = 960 - Vmtfl (Volts RMS) Example: A particular installation experienced an output over- voltage fault when the Capstone 60 output power was increased. The Capstone 60 was commanded OFF and the utility voltages were measured and recorded as shown below: VU = (279 + 275 + 278)/3 = 277.3V RMS Next, the Capstone 60 was restarted and output increased to a point just below the over-voltage trip point (45 KW). The 3 phase currents were measured and recorded as shown below: Imt =(56+50+52)/3=52.67ARMS The 3 line-to-neutral voltages were measured under this same 45 KW output and recorded below: Vmt = (287+ 289 + 288) / 3 = 288V RMS R = (Vmt - VU) / imt (ohms) = (288 - 277.3) / 52.67 = 0.203 (ohms) Vmtfl = 480 + 79*(R)*3(1/2) (Volts RMS) =480+79*0.203*3(1/2) =508VRMS Vtap = 960 - Vmtfl (Volts RMS) = 960 - 508 = 452V RMS The transformer had 2, 2-1/2% taps below normal full capacity. The lowest tap voltage was 456V RMS. This tap was connected to the Capstone 60 and the over- voltage faults were eliminated. Intervening Adjustable Tap Transformer Transformer PHASE A - NEUTRAL VOLTAGE 279V RMS PHASE B - NEUTRAL VOLTAGE 275V RMS PHASE C - NEUTRAL VOLTAGE 278V RMS Utility Source Distribution Panel MicroTurbine PHASE A CURRENT 56A RMS PHASE B CURRENT 50A RMS PHASE C CURRENT 52A RMS Impedance, x i VMicroTurbine Vutility PHASE A - NEUTRAL VOLTAGE 287V RMS PHASE B - NEUTRAL VOLTAGE 289V RMS PHASE C - NEUTRAL VOLTAGE 288V RMS Installation & Start-Up 10 511519-001PDF Image | C60 Mech
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