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SYSTEM COMMISSIONING
Megger Test
The installation of the wiring must be checked to ensure adequate insulation. This
will require a megger (insulation breakdown tester) with a 1000V scale. The test
should show any damage to the wire run from the turbine to the inverter.
While performing these tests the underground wire run must be disconnected
from the inverter, the tower wire run disconnected from the turbine and
adequate measures taken to ensure the turbine does not free spin while the test
is being conducted.
The first reading taken is with a phase to phase short applied to the down tower
disconnect. This reading will give an overall health report of the insulation. The
test is conducted phase to ground. A satisfactory reading will be 100
MΩ or
higher.
With the phase to phase short applied we have tested all three phases of the
system wire run in its entire length.
Next we want to double check the initial test readings by conducting, an
individual test to each phase of the underground wire run, down tower
disconnect and up tower wire run. All readings should be
100
MΩ or higher to
proceed with turbine commissioning.
NOTE: During all tests the turbine and inverter were not included in the testing
circuit.
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