Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum
A technology of transformer bushing and frequency domain dielectric spectrum, which is applied in the direction of measuring electrical variables, testing dielectric strength, instruments, etc., and can solve the problems that cannot be diagnosed quantitatively, but can only be diagnosed qualitatively
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[0051] In this embodiment, the frequency domain dielectric spectrum test is carried out at room temperature for the suspected damp bushing A, the normal bushing C and the newly shipped bushing Z with a voltage level of 500kV, and the real part of the complex capacitance of the three bushings is measured in the frequency domain graph as Figure 4 shown by Figure 4 Obtain the real part ratios of the complex capacitances of the three bushings at the frequency points of 1mHz and 10kHz respectively, such as Figure 5 Shown is the comparison chart of the real part ratio of the complex capacitance of the three bushings. Depend on Figure 5 It can be concluded that the real part ratio of the complex capacitance of the normal bushing C and the newly shipped bushing Z is close to 1, while the real part ratio of the complex capacitance of the suspected damp bushing A is 1.5, indicating that the moisture content of the A bushing is slightly higher than that of the C bushing. Tubes and...
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