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17 Cards in this Set
- Front
- Back
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What does hertz mean? What do our generators run at? |
Hertz = cycles per second. 3600 rpms or 60 cycles per second. |
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Why do we use H2 in our generators instead of air? |
Hydrogen is lighter and more efficient at transferring heat than air. |
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What is the explosive range of H2? |
5% - 75% H2 in air. |
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What H2 pressure do we maintain in 100 / 200? |
22 - 25 psi |
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What H2 pressure do we maintain in 300? |
25 - 28 psi |
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What is CO2 used for on the generators? |
To purge the generators and evacuate any air or H2 to prevent the creation of an explosive atmosphere. |
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When purging from H2 to air explain the gasses used and what goes in top or bottom. Also from air to H2. |
CO2 in bottom, air on top. CO2 in bottom H2 on top. |
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What should be done in the event of a low purity in the generator? |
Vent H2 from the bottom and replace with fresh H2. |
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When unsynchronized, what will happen as the speed is raised on the turbine? |
The frequency will go up. |
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What is the 300 generator H2 safety set at? |
50 psi |
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What is the purpose of the H2 system excess flow valve? |
It's designed to go closed in the event of a leak. |
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What is the low pressure alarm set at? |
30 psi |
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What type of tools should be used when working on H2? |
Non ferrous tools only. |
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What does a liquid level alarm indicate? |
Liquid in the generator. |
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What is the rated MW capacity of 100/200 generator? |
85 MW |
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What is the rated MW capacity of 300 generator? |
120 MW |
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What is the H2 high pressure alarm set at? |
60 psi |
