Click the Exhibit button. What type of power problem does the exhibit illustrate?

Question

Options

• AHarmonics
• BOvervoltage
• COvercurrent
• DImpulsive transient

• A
  6% (2)
• B
  14% (5)
• C
  9% (3)
• D
  71% (25)

Explanation

Option D is correct because an impulsive transient appears on a waveform as a sharp, sudden spike - either positive or negative - that occurs for a very brief duration before the signal returns to normal. This is the classic signature visible in the exhibit, typically caused by lightning strikes, switching of inductive loads, or electrostatic discharge.

Harmonics (A) are wrong because they show a repeating, distorted waveform pattern across multiple cycles, not a one-time spike. Overvoltage (B) is wrong because it represents a sustained increase in voltage above normal levels, not a momentary event. Overcurrent (C) is wrong because it refers to a prolonged excessive current draw, such as during a fault or overload condition, which has nothing to do with a brief spike shape.

Memory tip: "Impulsive" means sudden and forceful - think of a lightning strike hitting a power line. If the exhibit shows a single sharp spike on an otherwise normal waveform, it is an impulsive transient.

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