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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Neutral current exhibited an up and down pattern that went from a maximum of 1.5 amps to zero. The current would rise from one amp to 1.5 amps and then drop back down to one amp. Then it would drop to zero and stay there for several seconds. This pattern would repeat every 25 to 60 seconds. During the ramping of the reactive load from zero to 12 kVAR, a spike in the neutral current to 2.5 amps was observed. A small increase in voltage imbalance can be observed in the measurements of the individual phase-to-neutral voltages for this event. During this test it was important not to exceed the output capabilities of either MTG. In addition, load increases for the Honeywell MTG needed to be introduced in small enough increments to avoid tripping the unit. 5.5 Observations/ Conclusions 5.5.1 Capstone – Capstone Parallel Tests The following are the observations and major conclusions from this test: • In general, there were no unusual interactions between the two MTGs under testing. • The behavior of each MTG (grid-connect and stand-alone) was similar to the behavior that each MTG exhibited when tested separately. • There were some noticeable voltage fluctuations when the grid-connect MTG was ramped up and down (four to seven VAC). • There was an indication of voltage spikes and dips that were probably not captured completely by the Amprobe one-second-interval data. • Load imbalance did not seem to cause any noticeable voltage imbalance, but it did cause neutral current to flow. • The grid-connect MTG tripped in response to loss of grid power when the stand-alone MTG tripped. 5.5.2 Honeywell – Capstone Parallel Tests The following are the observations and major conclusions of this test: • There were no unusual interactions between the two MTGs being tested. • The behavior of each MTG (grid-connect and stand-alone) was similar to the behavior that each MTG exhibited when tested separately. • The C-phase voltage at the load banks was five to seven VAC higher than the other two phases throughout the test. • Voltage level remained fairly constant throughout the test with some voltage sag caused by increasing the reactive load. 28PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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