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12 Cards in this Set
- Front
- Back
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What does hertz mean? Where do our machines run?
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Hertz is the measurement of cycles in A/C power systems in one second. Our machines run at 60 cycles or 3600 rpms.
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Why do we use H2 in the generators as opposed to air?
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H2 is lighter than air and less dense, this allows for better cooling.
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What is the explosive range of H2?
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5 - 75% in air
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What psi of h2 do we typically maintain our generators?
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ST 1-3 typically runs between 20 - 30 psi.
ST 4 typically runs between 15 - 20 psi. This can be adjusted as needed as load changes on the generator. |
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What is the C02 used for on the Power 1 generators?
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To Purge and remove any air or H2 to prevent an explosive atmosphere.
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When purging from H2 to air explain the gases used and what goes in bottom and what goes on top?
Also from Air to H2? |
C02 in bottom, air on top.
C02 in bottom, H2 on top. |
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What should be done in the event of low purity?
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Vent off H2 (from bottom) and replaced with fresh H2.
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When unsynchrobized, what will happen as the speed is raised in the turbine?
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The frequency will go up
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What is the purpose of the H2 system excess flow valve?
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It is designed to trip closed in the event of an H2 leak.
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What type of tools should be used when working on H2 systems?
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Non ferrous tools only
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What does a liquid level detector alarm indicate?
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Liquid in the generator (oil = seal issue, Water = cooler leak)
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What is the rated MW capacity of the Power 1 generators?
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ST1 = 50
ST2 = 90 ST3 = 90 ST4 = 59 ST5 = 200 |
