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10.4 Bushing & PD Monitor Commissioning
DGA 900 Plus products with a bushing card enabled must undergo BMT commissioning.
This section outlines parameters to be verified while the transformer is energised and
running at operational conditions regarding the grid voltage (phase and amplitude).
Note:
Note:
Administrator level access is required to view settings, but to make changes a
factory POTM is required to enable service mode.
Note:
While the transformer is offline, enable Service mode to switch Alarms off to
prevent nuisance alarms occurring until the transformer is re-energised.
WARNING: The transformer is live during this process. Ensure that the
Bushing Adaptor cables are undamaged as far as can be observed before
approaching the Hub enclosure and always maintain a safe working area.
All settings should be checked against the customer specific workflow created for each
individual bushing system and recorded in the Commissioning Report (and to be stored
with the Installation Report).
10.4.1 General Settings
Select BMT > General Settings as shown in Figure 10-20 and ensure that the following
parameters are correct:
▪
Operational Voltage Format – Peak to Ground or RMS
▪
Primary Operational Voltage and Secondary Operation Voltage (If applicable)
Figure 10-20: BMT > General Settings
Select BMT > Configuration as shown in Figure 10-21 and ensure that the following
parameters are correct:
▪
Operating Frequency
▪
Monitoring mode – Single transformer or Multiple Transformer
Figure 10-21: BMT > Configuration
10.4.2 Voltage Measurement
Measure the voltage across each bushing adaptor input on the terminal rail as shown in
Figure 10-22. Each input should measure between 0.9 V rms to 1.4 V rms.
MA-040 – DGA 900 Plus - Operator Guide - Rev 1.1
Transformer load is irrelevant for commissioning.
4-Mar-22
Page 87 of 99
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