100 KVA Distribution Transformer Rated Current
What is the rated current of a 100 kva distribution transformer? How many kilowatt loads can a 100KVA transformer carry under normal operation?
1. Rated current of 100 kva distribution transformer
First of all, we must be clear that the transformer only adjusts the voltage, and cannot control the energy. That is to say, the working principle of the transformer is to comply with the law of energy conservation.
Secondly, the transformer is a conversion device between high voltage and low voltage. Therefore, the rated current of the transformer can be divided into high-voltage side current and low-voltage side current.
Third, after understanding the first two points, we need to know a conversion formula, which is also the most commonly used formula in the power system:
Apparent power (KVA) = line voltage (KV) * line current (A) * 1.732
Lets take the voltage transformation ratio of 10/0.4KV as an example to calculate the current value for you
1) High voltage side current
Line current (A)=100(KVA)/[10(KV)*1.732]=5.773(A)
2) Low-voltage side current
Line current (A)=100(KVA)/[0.4(KV)*1.732]=144.34(A)
2. How many kilowatts does a 100KVA transformer bring
How many kilowatt loads can a 100 kva distribution transformer carry? The above formula is obviously no longer applicable. Accurate calculation needs to know parameters such as power factor, electricity consumption coefficient, etc. This process is very complicated. There is a relatively conservative estimation method:
Apparent power (KVA) = active power (KW)/0.8
We put the conditions we already know into the formula and get:
Active power(KW)=100(KVA)*0.8=80(KW)
This is the power value that can be brought out when the transformer is running at full load, but the relevant regulations point out that the long-term full-load operation of the transformer cannot be higher than 80% of the nominal capacity of the transformer.
According to this rule, lets do the calculation again:
Active power under normal operation (KW) = 100 (KVA) * 0.8 * 0.8 = 64 (KW)
