parasitic parameters 6 Test for sin

parasitic parameters 6 Test for single or multi-phase inverter 6.1 Test procedure The following test is designed for an EUT consisting of a single or multi-phase inverter1. The test uses an RLC load, resonant at the EUT nominal frequency (50 Hz or 60 Hz) and matched to the EUT output power. For a multi-phase EUT, the load shall be balanced across all phases and the switch S1 as in Figure 1 shall open all phases2. This test shall be performed with the EUT conditions as in Table 5, where power and voltage values are given as a percent of EUT full output rating. EUT settings for voltage and frequency trip parameters (magnitude and timing) can affect the measured run-on time. Passing this test verifies that the unit will provide adequate islanding protection for the settings tested as well as for tighter settings (e.g., an EUT that passes the test with frequency trip settings of ± 1,5 Hz of nominal should also trip within the maximum measured run-on time for settings of, say, ± 0,5 Hz.) Conversely, when adjusted to settings outside of those tested, the EUT may experience extended run-on times. Frequency settings of ±1,5 Hz around nominal frequency and voltage settings of ± 15 % around nominal voltage, for the purposes of this test procedure, should be wide enough to address the majority of utility requirements. Note that as trip settings are widened, more aggressive active antiislanding schemes may be required that could negatively impact power quality. Table 5 – Test conditions