Exact(8)
Whenever admittance phase becomes negative, the associated equation-based CV also becomes negative.
The presence of an air leak can be reliably detected using low-frequency admittance phase or low-frequency absorbance.
Low-frequency admittance phase and CV/PV decreased, while low-frequency absorbance and the air-leak resonance frequency increased.
For frequency ranges as low as 0.2 kHz, low-frequency absorbance should be ≤0.29 and low-frequency admittance phase ≥44 degrees.
Recommended criteria for detecting air leaks include the following: when the frequency range of interest extends as low as 0.1 kHz, low-frequency absorbance should be ≤0.20 and low-frequency admittance phase ≥61 degrees.
The admittance phase, which is expected to be approximately 90 degrees at low frequencies (e.g. Henriksen 2008) in the absence of a leak, can become much less than 90 degrees and even less than zero at falr when an air leak is present.
Similar(52)
From this result, the admittance and phase changed notably at 47 kHz.
The target center frequency was chosen as the frequency where the electrical admittance (|Y|) and phase angle (θz) from impedance analysis was maximal and zero, respectively.
The calculated admittance of three-phase VSCs is verified by detailed circuit simulations.
b Complex phase of admittance between FGAs and topography.
In admittance representation, a constant phase element is defined as Y = Y o (jω) n, where Y o and n are adjustable parameters (n = 0,1 corresponds to an ideal resistor and a capacitor, respectively), and ω is the angular frequency.
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