The proposed measurement method is analyzed in PSCAD/EMTDC, which shows that the method has high measurement accuracy and is safe, simple and economical for the measurement of ground capacitance current. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.
Sci. 793 012024 DOI 10.1088/1755-1315/793/1/012024 The traditional method of measuring grounding capacitance of distribution network is greatly affected by neutral grounding method, and the influence of harmonic elimination resistance and internal impedance of voltage transformer on measurement accuracy cannot be eliminated.
The maximum ground fault current allowed by the Neutral Grounding Resistor must exceed the total capacitance to ground charging current of the system. The total capacitance to ground charging current of a system can be measured or estimated. Should only be done by qualified personnel.
The fault current during the capacitor discharge depends on the total DC side capacitance and the total fault current loop impedance. The DC side capacitance is the total cumulative capacitance of grid-connected voltage source converter (G-VSC) capacitor, other converter capacitors, and line capacitances.
For low-frequency applications, the capacitance can be calculated by analyzing the energy related to the electrostatic field, thus disregarding the displacement current. To evaluate the capacitance of a given geometry, it is necessary to calculate the electric potential on the surface of the analyzed conductor.
Note that the “capacitor” should in fact be a parallel combination of a number of capacitors, depending on the application, to guarantee performance across the spectrum. The following are typically used: 100 pF, 1 nF, 10 nF, 0.1 μF, and 1 μF.
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