A UPS system consists of three modules in a parallel redundant configuration. Each module is rated to provide 200 kW of power.If the electrical load grows from 350 kW to 420 kW, what will happen?

Question

Options

• AThe UPS system will not provide any additional power beyond 400 kW.
• BThe UPS system will reach an overload state and switch to its static bypass.
• CThe UPS system's response will vary depending on the rate of electrical load growth.
• DThe UPS system will continue to support the load and become a capacity

• A
  7% (1)
• B
  7% (1)
• C
  13% (2)
• D
  73% (11)

Explanation

Option D is correct because with three 200 kW modules in parallel, the UPS system has a total capacity of 600 kW, so a load of 420 kW is well within what the system can deliver - all three modules share the load, and the system continues operating without interruption, though it now consumes a higher percentage of total capacity and redundancy is reduced.

Option A is wrong because 400 kW is not the system's ceiling - that figure only represents two modules, and all three are available to share the load in a parallel configuration. Option B is wrong because the 420 kW load does not exceed the 600 kW total system capacity, so no overload condition exists and the static bypass is never triggered. Option C is wrong because the rate at which the load grows is irrelevant to whether the system can support it - what matters is the total load versus total capacity.

Memory tip: Multiply all modules by their rating to get true parallel capacity (3 x 200 kW = 600 kW), then check if the new load fits - if it does, the system runs, it just has less headroom.

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