A method for detection of ground capacitance parameters
A technology for ground capacitance and parameter detection, which is applied in capacitance measurement, measurement devices, and measurement of electrical variables, can solve problems such as unresolved harmonic elimination problems, achieve real-time estimation, save costs, and improve detection accuracy.
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Embodiment 1
[0031] Such as Figure 1~3 As shown, a method for detecting capacitance parameters to ground includes the following steps:
[0032] S1: Using multiple generalized integrators to form a frequency selector for extracting the injected frequency signal;
[0033] S2: Use a frequency selector to extract a specific frequency signal from a zero-sequence voltage signal containing various harmonic components;
[0034]S3: Use the signal injection method to measure the size of the capacitance to the ground: use the frequency generation circuit to inject different frequency signals on the capacitance to the ground, the step size of the signal injection is 0.1Hz, the duration is 0.2s, and the zero sequence is detected by the oscillation frequency detection circuit The maximum value of the voltage is obtained to obtain the resonant frequency value;
[0035] S4: Calculate the capacitance to ground according to the principle of LC parallel resonance.
[0036] In S1, multiple generalized int...
Embodiment 2
[0043] The ground capacitance parameter detection method of the embodiment of the present invention further improves the first embodiment: the active component and the harmonic component in the ground fault current are detected by using the automatic turn-adjusting arc suppressing coil and the single-phase voltage source inverter. When compensating, it is necessary to estimate the line-to-ground capacitance current, and the line-to-ground capacitance C 0 It cannot be measured, and needs to be processed and calculated; secondly, since the capacitor current leads the zero-sequence voltage by 90°, after the capacitance value is known, the zero-sequence voltage needs to be phase-shifted during actual calculation.
[0044] The calculation method of the above processing is: use the signal injection method to measure the size of the ground capacitance, inject different frequency signals each time, the step size of the signal injection is 0.1Hz, and the duration is 0.2s, and the resona...
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