How to measure the stator DC resistance value of a diesel generator? Excitation winding DC resistance
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Diesel generator model: GEP700-1； Capacity: 560 kW, Rated voltage (V): 400, Exciter voltage (V): 40, Insulation class: H, Rated current (A): 1010, Exciter current (A): 2. Manufacturer: OLYMPIAN, Wiring type: Y, Rotational speed (r/min): 1500, Date of manufacture: 2009, Power factor: 0.8, Enclosure protection class: H, Serial number. DC resistance measurement: Stator winding phase names: ABC; Resistance difference between phases: DC resistance (Ω): 2%, DC resistance of exciter winding (Ω). Insulation tests: Insulation resistance (MΩ), Absorption ratio – Stator winding: 24, Exciter winding: 25. What value should be entered for the DC resistance during measurement? And the absorption ratio must not be lower than 1.2, right?
It is generally measured using a bridge (selecting between two-arm or single-arm based on the resistance value).
The stator DC resistance value and the excitation winding DC resistance can be measured directly using a DC resistance tester.