Katolight — Insulation Test
Testing & diagnosis · Generator windings
From a Katolight service manual covering: 280 -- 430 Frame, 280 frame, 360 frame, 430 frame. Check it applies to your exact model before use.
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Before you start
- Caution must be taken to remove all electronic devices from the winding circuit before checking the insulation.
Procedure
- Remove all electronic devices (regulators, diodes, surge protectors, capacitors, protective relays, etc.) from the winding circuit.
- Measure insulation resistance with a megger (mega-ohm meter) placing 500 volts between the winding and the frame.
- Check main stator, main rotor, exciter stator, and exciter rotor.
- If winding resistance is low it must be dried or repaired.
Tools required
- Megger (mega-ohm meter) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum resistance is 2 mega-ohms
- 500 volts applied between winding and frame
Source: Katolight service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.