By using the protection method for primary-only protection, the maximum overcurrent protection (MOCP) is equal to 451.59 Amperes.
<h3>What is MOCP?</h3>
In Electrical engineering, MOCP is an abbreviation for maximum overcurrent protection and it can be defined as the maximum allowable current rating that is required for any circuit breaker or fuse, in order to properly protect an electrical equipment, especially under uncertain or anticipated fault conditions.
Mathematically, the amount of current flowing through the primary winding of a three-phase transformer can be calculated by using this mathematical expression:
Current, I = 3-phase KVA/(1.73 × Voltage)
Substituting the given parameters into the formula, we have;
Current, I = 300,000/(1.73 × 480)
Current, I = 300,000/830.4
Current, I = 361.27 Amperes.
By using the protection method for primary-only protection, the maximum overcurrent with 25% above the current is given by:
Maximum overcurrent = 125% × Current
Maximum overcurrent = 125/100 × 361.27
Maximum overcurrent = 45,158.75/100
Maximum overcurrent = 451.5875 ≈ 451.59 Amperes.
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