MA-041 – DGA 900 Plus - Installation & Commissioning Manual - Rev 1.1 4-Mar-22 Page 73 of 99
▪ Cooling Condition
The product supports up to four cooling banks. Each bank can be independently set to
zero, and the operational time and switching can also be reset.
Note: After installation, it is advisable to reset all the counters to zero
Note: Before resetting the counters, ensure that the internal time and date are
correct. (The internal time can be found on the dashboard home page).
Click Reset to Zero to reset the listed parameters to hold a value of zero.
10.3 OLTC Monitor Commissioning
DGA 900 Plus products with an OLTC card enabled must undergo OLTC commissioning
to ensure optimal and correct use of the following models:
▪ OLTC Tap Position Tracking
▪ OLTC Motor Torque
▪ OLTC Temperature
Commissioning determines the following:
▪ Mapping for mechanical position number to analogue input current
▪ Generation of group calculation parameters
▪ Limits for OLTC motor torque model alarms
The models require custom parameters unique to each tap changer. These can be found
in the customer-specific ‘Models Configurator’ spreadsheet (available from the GE
Service Team). OLTC commissioning requires the A14 (tap position) and A17 (motor
torque) inputs.
After installing the OLTC Motor Power Converter, the OLTC Tap Position
and OLTC Torque models must be left disabled (refer to ‘Section 6.4: Models
Activation and Status’ in the ‘MA-040 – DGA 900 Plus – Operator Guide’)
until commissioning is successfully completed.
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