Cooling systems are designed to provide adequate cooling for full load operation at a specified ambient air temperature typically between 40C° (104F°) and 50C° (122F°).
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The flammability limits (4 ‐ 75% of hydrogen in air at normal temperature but greater at higher temperatures), its autoignition temperature at 571°C, its very low minimum ignition energy, and its tendency to form explosive mixtures with air require provisions to be made for.
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Temperature rise refers to the increase in temperature of the generator's internal components (primarily the stator windings) above the ambient (surrounding) air temperature when the generator is operating under load. It's expressed in degrees Celsius (°C) or Fahrenheit.
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Elevated generator temperature typically stems from five root causes: cooling failures, overloads, environmental stress, mechanical faults, or poor maintenance. Ignoring these risks catastrophic damage—from seized pistons to burnt windings.
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