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10 Cards in this Set
- Front
- Back
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The _____ provides a highly reliable, continuous source of
______to valves, logic relays, control devices, circuit breakers, instrumentation and inverters of the uninterruptible power supply systems. |
DC Electrical System
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The safety-related batteries are rated to supply their respective loads for:
a) Div. I and II - _______ b) Div. III - ________ |
4 hours
2 hours |
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List the major components of a DC electrical system
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a) A battery charger supplying a DC bus (normal source of power) Off
the bus are distribution lines going to the various DC loads. b) A battery (alternate source of power.) |
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A _____ is a device that converts 480 VAC to DC bus voltage.
There is a battery charger for every DC bus. They normally supply the DC bus loads. The batteries are maintained in a FLOAT condition. If the battery charger fails to maintain DC bus loads, the battery will automatically pick up the loads before voltage drops too far. |
battery charger
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A battery charger is a device that converts ____ to DC bus voltage. There is a battery charger for every DC bus. They normally supply the DC bus loads. The batteries are maintained in a _____ condition. If the battery charger fails to maintain DC bus loads, the battery will automatically pick up the loads before voltage drops too far.
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480 VAC / FLOAT
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If a normal battery charger fails or if one has to be taken out of service for maintenance, a ____ can be used to maintain that DC
bus’ loads. |
backup battery charger
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The hazards that can be present in a battery room include:
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a) Hydrogen gas production during charging
b) Battery acid c) Exposed electrical leads |
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The DC busses are designated as follows:
a) ENB - ___________ b) BYS - ___________ |
a) ENB - Safety-related
b) BYS - Non-safety-related |
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ENB - _________
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ENB - Safety-related
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BYS - _____________
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BYS - Non-safety-related
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