ABB 5761789-6H

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Description

ABB 5761789-6H
ABB 5761789-6H
Table 2 records the capacitance at 0.1 μ F. 1 μ F. And 10 μ Test results for parallel connection of different resistors in these three cases.
From the data in the table, it can be seen that at C=0.1 μ At F, the measurement error of resistance is about 5%, and the measurement error of capacitance is about 10%; At C=1 μ At F, the error of the resistor is about 8%, and the error of the capacitor is about 9%; At C=10 μ At F, the measurement error of resistance is about 17%, and the error of resistance and capacitance is about 6%.
When measuring equivalent insulation resistance and distributed capacitance online, the inductance in the transformer will have a certain impact on the measurement accuracy of the capacitance because the low-frequency AC signal is applied to the neutral point of the isolation transformer. Because there is a leakage resistance inside the capacitor, which is equivalent to a megohm level resistance connected in parallel at both ends of the capacitor, during the experiment, three capacitors were connected in parallel to form 10 μ The capacitance of F greatly reduces the equivalent parallel resistance at both ends of the capacitor, so as the measured resistance value increases, the error becomes more obvious.

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