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Battery and UPS Systems Testing Flashcards

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Read the first 7 Battery and UPS Systems Testing flashcards as text

  1. Which battery type allows specific gravity measurement of the electrolyte as a primary acceptance test method?

    Answer: Flooded vented lead-acid

    Flooded vented lead-acid batteries have accessible electrolyte, allowing a hydrometer to measure specific gravity as a direct indicator of state of charge.

  2. What instrument is used to measure the specific gravity of a battery cell's electrolyte during NETA acceptance testing?

    Answer: Hydrometer

    A hydrometer measures the density of the electrolyte relative to water, which directly correlates to the state of charge in lead-acid battery cells.

  3. According to NETA acceptance testing standards, individual float voltage measurements for battery strings should be recorded at which level?

    Answer: Each individual cell

    NETA requires measuring float voltage at each individual cell to identify weak or failing cells that may not be evident from string-level measurements.

  4. What is the primary operational advantage of internal resistance/conductance testing compared to a full capacity discharge test?

    Answer: It can be performed online without interrupting the connected load

    Internal resistance and conductance testing are non-invasive and can be performed while the battery remains connected to the system, avoiding service interruption.

  5. What is the standard end-of-discharge voltage per cell for a 2V nominal lead-acid battery cell during a rated capacity test?

    Answer: 1.75 V per cell

    IEEE 450 and NETA standards define 1.75V per cell as the standard end-of-discharge (final) voltage for lead-acid batteries during a rated capacity test.

  6. What minimum percentage of rated capacity must a battery string demonstrate during a NETA acceptance capacity test to be considered acceptable?

    Answer: 80%

    NETA acceptance testing requires batteries to deliver a minimum of 80% of their rated ampere-hour capacity at the specified discharge rate to pass.

  7. Which battery type presents the greatest risk of hydrogen gas accumulation during the charging process, requiring adequate ventilation?

    Answer: Flooded vented lead-acid

    Flooded vented lead-acid batteries produce and vent hydrogen gas during charging through electrolysis, creating a potential explosion hazard without proper ventilation.