Question
Download Solution PDFA three phase circuit breaker is rated at 2000 MVA, 33 kV. The symmetrical breaking current is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFBreaking capacity of a circuit breaker
The rated breaking capacity is defined as the maximum fault current a circuit breaker can successfully interrupt without being damaged.
It is always expressed in KVA and the current corresponding to breaking capacity is known as the breaking current.
The breaking current is given by:
where, Ib = Breaking current
MVA = Breaking capacity
VL = Line-to-line voltage
The relationship between making and breaking current is:
where, Im = Making current
Ib = Breaking current
Calculation
Given, Breaking capacity = 2000 MVA
VL = 33 kV
Ib = 34.9 kA (OR) 35 kA
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