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5.4 Insulation resistance measurements
Measure the insulation resistances of windings and all auxiliary equipment before
making any electrical connections and applying voltage to the machine.
Measure the insulation of at least the following parts:
•
Stator and rotor winding.
•
Exciter winding.
•
Anti-condensation heaters (optional).
The measured values indicate the condition of the insulation between the winding
(or other circuit to be tested) and the frame of the machine. For detailed
information on how to conduct these measurements see Chapter 7.6.4. Insulation
resistance test.
If the insulation resistance is under the specified value, it must be corrected before
starting the machine, see Chapter 7.6.8. Drying.
Measure the insulation resistance well before the planned first start so you will
have time for any necessary corrective actions.
The winding must be dry during the test. Therefore the anti-condensation heaters
should be active during storage and installation.
5.5 Automatic Voltage Regulator (AVR)
Pre-settings and testing by ABB
The AVR has been tested with the specific generator and all the basic settings
have been modified and saved so that the AVR will also work at site. The correct
AVR and the correct generator can be identified by checking the serial numbers
on the test report, see Test Reports.
Settings used in testing can be found in Test Reports.
Checking at site before first run
All the settings has to be checked once more at the site of the generator. If there is
need to change the settings it must be done by a qualified person such as an ABB
or AVR representative.
NOTE: Settings for the network must also be checked and verified.
NOTE: For detailed information about the settings and commissioning see
5.6 Starting
Start-up of the machine
The starting of the machine depends on the application, but main guidelines are:
1. Switch the anti-condensation heaters off if not operated by switchgear.
2. Start to rotate the machine.
3. Maintain rated speed.
4. Switch the machine excitation on (unless self excited automatically).
5. Maintain rated voltage.
6. Check synchronizing parameters (if necessary).
7. Synchronize the machine to the grid (if necessary).
Annex 5. Commisioning Report, Annex 6. Automatic Voltage Regulator
User's Manual and Annex 7. Test Reports.
Page 32
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