MA-041
–
DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1
4-Mar-22
Page 69 of 99
Figure 9-53: R3 total resistance measurement
Ensure that the measurement of [
R3
] is within 5% of the total input resistance [
R
input
]
calculated from [
R1
] and [
R2
] for each input.
Note:
The total input resistance [R
input
] is calculated as [R
input
]=1/(1/[R1] + 1/[R2])
9.8.2.4.5
Input voltage Test
Once the transformer is energised and the grounding switches are in the operational
position (i.e. not grounded), measure the voltage drop across the core and the shield at
the block terminals of the coaxial cables connected to the Bushing Adaptors as shown in
Figure 9-54 and record these voltages in Table 9-7: Results. These voltages must be
within 0.9 to 1.4 Vrms.
Figure 9-54: Input voltage measurement
