For a transformer rated at 500 KVA with a primary voltage of 250 volts, what is the appropriate fuse size on the secondary side?

To determine the appropriate fuse size on the secondary side of a transformer rated at 500 KVA with a primary voltage of 250 volts, it's essential to understand how to calculate the current on the secondary side based on the transformer's rating.

First, we can calculate the secondary current using the formula:

[

\text{Current (I)} = \frac{\text{Power (P)}}{\text{Voltage (V)}}

]

Since the transformer is rated at 500 KVA (kilovolt-amperes), we convert this to watts (since 1 KVA = 1000 VA):

[

500 \text{ KVA} = 500,000 \text{ VA}

]

Next, we need to know the secondary voltage. For the sake of this problem, let's assume a common secondary voltage. In many applications, a standard lower voltage might be around 120 or 480 volts, but since it’s not specified in the question, this won't change the choice of the fuse related to the current calculation because the transformer will step down voltage accordingly.

However, the significant aspect is confirming the maximum current the transformer can handle, which leads us to:

Assuming a secondary voltage of 480 volts, the