Question
Download Solution PDFWhat is the PSM of a relay having a pick up current of 5 A, when used with a 400/5 current transformer if the fault current in the circuit is 4000 A?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The Plug Setting Multiplier is calculated as:
Fault current on secondary =
Calculation
Given, Ipick-up = 5 A
Current Transformer (CT) ratio: 400/5. This means that when 400 A flows in the primary circuit, 5 A flows in the secondary.
Fault Current in the Primary Circuit: 4000 A
Fault current on secondary =
Last updated on May 29, 2025
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