1. Insulation
         When the equipment and facilities are not destroyed near the construction site, the temperature of the diesel generator set (without the muffler and acquisition) is to ensure that the unit works with thermal insulation measures, and the surface temperature of thermal insulation measures does not exceed 140 ℃.
         2. Dielectric strength
         The electrical winding of the diesel generator set on each separate circuit between the ground and the circuit is subjected to a test frequency of 50hz, the test voltage is 1500v, the better the actual sinusoidal waveform, when the dielectric strength test lasts for 1min, there is no breakdown or arcing Phenomenon.
         3. Insulation resistance
         Diesel generator sets are carried out in an ambient temperature of 15°C-35°C, 45%-75% of the ground and not more than 25mω, not less than 5mω, and the insulation resistance between the hot and cold circuits is less than the relative humidity of each circuit.
         4. Grounding device
         Diesel generator sets have good grounding.
         5. Overspeed
         Diesel generators run at 120% of rated speed for 10 minutes without breakage.
         6. Overcurrent

         Diesel generators can withstand an overcurrent of 150% of the rated current for 15 seconds.