In relay terminology, what does the term 'pickup value' refer to?

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  1. The time delay before the relay operates after detecting a fault
  2. The minimum value of the operating quantity (current, voltage, etc.) required to activate the relay 
  3. The voltage level at which the relay resets after a fault is cleared
  4. The maximum current a relay can withstand without damage

Answer (Detailed Solution Below)

Option 2 : The minimum value of the operating quantity (current, voltage, etc.) required to activate the relay 
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Detailed Solution

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Concept:

In relay terminology, the 'pickup value' refers to the minimum value of the input quantity (like current or voltage) at which the relay starts to operate or activate. It is the threshold beyond which the relay detects a fault and initiates a response.

Calculation

If the operating quantity (such as current or voltage) exceeds the pickup value, the relay coil gets energized and the relay contacts begin to move to their operating positions. This threshold ensures the relay doesn't operate for minor fluctuations.

Other options describe time delay, reset value, or withstand capacity, which are different from the pickup function.

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