8
SGB-300C
AC
：
300kV,DC
：
300kV
AC
：
1.5%
DC
：
1.0%
Low
：
0-20kV,High
：
0-300kV
3600
5m 250*250*1900
22
IV. Measuring principle
Figure 1 measuring principle
This device uses resistance-capacitance voltage division method to test
HV AC & DC, which as shown in figure 1. The left side is high voltage part,
uses resistance-capacitance division circuit, which composed by impedance
Z1 and Z2. High voltage Ui input from the upper equipotential ball, low voltage
sampling signal output from Z2; the right side is the LV display meter, which
used for processing the Uo. Uo is processed by rectifying filter amplifier and
displayed by LV display instrument. The relationship between Ui and Uo as
shown in formula (1)
