3. TROUBLESHOOTING
69
WARNING
If the insulation resistance decreased obviously, it means that the insulation is damaged. If
you don’t repair it in time, it will result in creepage and endanger the man and equipment
security. Make sure often test the insulation resistance of the winding to understand the
insulation instance.
Winding to Grounding Insulation Resistance Testing
One of the megohmmeter’s terminals is connected through the insulation wire with any
wire of the tested winding, and another is connected with iron core. Next wave the
megohmmeter from slowly to fast, and the meter needle follows wave. When the meter
needle is stable, the value indicated by the needle is the winding to ground insulation
resistance value.
Collector Ring to Ground Insulation Resistance Testing
One of the megohmmeter’s terminals is connected through the insulation wire with a
copper ring of the connecting ring, and another is connected with iron core. Next wave
the megohmmetr from slowly to fast, and the meter needle follows wave. When the
meter needle is stable, the value indicated by the needle is the insulation value of the
tested copper ring.
COLLECTOR RING
CONNECT
WITH
THE COPPER CORE
MEGOHMMETER