Transformer capacity unit KVA?
Transformer capacity unit KVA is how is it?
10KVA transformer, the maximum number of KW can be connected to electrical appliances?
Supplementary - 2006-07-27 10:00:32
30KVA transformer, the maximum number of KW can be connected to electrical appliances?
We plan to rent a workshop, there are power 380V, transformer capacity 30KVA. I want to install an electric furnace 75KW, welding machine 53KW, there are other small power appliances. Transformer capacity enough?
I am full of transformer on the layman, please explain in detail, do not rhetoric.
The rated value of the output capacity of the transformer in the rated state is expressed in kilowatts (kVA) (VA and MVA are not commonly used). Since the transformer has a high operating efficiency, the original, secondary winding (winding deformation Tester) rated capacity equal to the design value. KV.A is the capacity of the transformer, KVA is the apparent power, its size and power factor.
KV and KVA conversion relationship
1 kV (kV) = 1000 V (V)
1 V (V) = 1000 mV (mV)
Kilovolts greater than volts greater than millivolts, the rate of 1000.
1 V (V) = 1000000 VV (μv)
1 MV (MV) = 1000000 V (V)
What is the difference between kv, kva and mva?
The kilovolt ampere (kVA) is the power measurement standard that is 1 kilovolt ampere. KVA is equivalent to the current in a circuit generated by the voltage of that line, usually measured in the transformer, that is he is a current unit. And kilowatts refers to the power of an electrical, that is, the power of the unit. The rated capacity represents the guaranteed value of the transformer output power under rated operating conditions and is the apparent power of the transformer. That is, the maximum output power of the transformer capacity, the transformer can not be the actual output power and capacity to be confused. The units are voltammetry (VA), kVA, and MVA.
The transformer uses KVA as a unit because it is not possible to obtain active power (symbol P, unit KW) and reactive power (symbol Q, unit KVAR) if the load is not determined, and only use KVA as a unit Apparent power, symbol S.
S ^ 2 = P ^ 2 + Q ^
You can understand the active impedance of the transformer when the load is pure impedance.
In addition, how to KVA as a unit of transformer production, calculate the number of transformers?
The size of the load divided by the transformer capacity, leaving the margin, that is, the number of transformers, if the power factor is small, it is necessary to add a few too transformer, but this is not very economical, better way is to reactive compensation.
You can refer to the load power size, and power factor, if the power factor is not, you can estimate to take 0.8,
(Power transformers are generally 110KV, 220KV, 500KV)
Question added: 110KV transformer, is not it that the maximum output voltage is 110KV?
Not the highest output voltage, but the rated output voltage. That is, the primary input voltage, the secondary side of the output voltage, you can understand the normal operating voltage.
