C1% Measurement - GE Kelman DGA 900 Plus Installation & Commissioning Manual

Figure 10-22: Voltage Measurement

10.4.3 C1% Measurement

To ensure that the configuration is correct for this system:
▪
Select BMT > Live Measurement as shown in Figure 10-23 and ensure that the
'Expected Current mA' for each phase is within 10% of the measured current mA
reading.
Troubleshooting Tip: If there is a ±40% difference between the expected and
measured C1 values, the likely reason for this is an incorrect 'Operational Voltage
Format' (see Section 10.4.1 and check with the customer to confirm Peak to ground
or RMS).
Figure 10-23: Bushing
Note: Refer to 'Section 10: Bushing & PD Monitor' in the 'MA-040 – DGA 900 Plus –
Operator Guide' for operational guidance on the settings below.
▪
Select BMT > Configuration and ensure that the Bushing Profiles Nameplate
nominal values are correct and assigned to the correct bushing.
▪
Select BMT > General Settings and ensure that the Primary Operational voltage is
correct.
▪
Select BMT > Calibration and ensure that the Bushing Adaptor Calibration Data load
impedance is set correctly for each bushing profile.
MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 88 of 99