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Capacitance and Dissipation Factor Measurement
The CP TD1 takes all these effects into account and compensates for them
electronically, so it is now possible for the first time to measure in the field down
to DF = 5 x 10E-5. Figure 5-20 shows the complete equivalent circuit diagram.
Figure 5-20 CP TD1 measuring principle
To the present day, the dissipation or dissipation factor was measured only at
line frequency. With the power source described in [2.2], it is now possible to
make these insulation measurements in a wide frequency range. Beside the
possibility to apply frequency scans, measurements can be made at frequencies
different from the line frequency and their harmonics. With this principle,
measurements are possible also in the presence of high electromagnetic
interference in high-voltage substations.
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