Method and device for measuring ground capacitance of DC system
A technology of ground capacitance and DC system, which is applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve problems such as grounding faults in DC systems, protection malfunctions, system safety hazards, etc., to avoid grounding faults , the effect of preventing impact
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Example Embodiment
[0032] Example one:
[0033] figure 1 Shown is a schematic flow chart of Embodiment 1 of the method for measuring the ground capacitance of a DC system of the present invention:
[0034] Step 101: Inject an AC signal between the positive and negative buses of the DC system and the ground through capacitive coupling;
[0035] Step 102: Measure the voltage amplitude, current amplitude, and phase difference of the voltage and current of the AC signal;
[0036] Step 103: Calculate the DC system ground capacitance according to formula (3), and calculate the DC system ground insulation resistance according to formula (4).
[0037] C + + C - = R 1 2 + X 1 2 2 * π * f * X 1 - - - ( 3 )
[0038] R + / / R - = R 1 2 + X 1 2 R 1 - - - ( 4 )
[0039] R 1 = V cos Φ I - - - ( 5 )
[0040] X 1 = V sin Φ I ...
Example Embodiment
[0043] Embodiment two:
[0044] The difference between this embodiment and the first embodiment is that this embodiment adds a signal isolation step in step 101 and step 102 of the first embodiment respectively. In step 101 of this embodiment, the AC signal is injected through the coupling capacitor after signal isolation. Between the bus bar and the ground, in step 102 of this embodiment, the measured voltage amplitude, current amplitude, and phase difference of the voltage and current of the AC signal are subjected to signal isolation processing.
[0045] Other technical features in the second embodiment are the same as those in the first embodiment, and will not be repeated here.
Example Embodiment
[0046] Embodiment three:
[0047] The difference between this embodiment and the second embodiment is that this embodiment adds a signal amplifying step in step 101 and step 102 of the second embodiment respectively. In step 101 of this embodiment, the AC signal is amplified by signal isolation and then passed through the coupling capacitor. Between the injection bus and the ground, in step 102 of this embodiment, the measured voltage amplitude, current amplitude, and phase difference of the voltage and current of the AC signal are subjected to signal isolation and amplification processing.
[0048] Other technical features in the third embodiment are the same as those in the second embodiment, and will not be repeated here.
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