變壓器容量為100-630kVA，電機功率為幾-幾百kW，kVA為視在功為，kW有功功率，kVAR為無功功率。 有功功率與無功功率平方之和等于視在功率。 他們的關系是: 有功功率=視在功率*功率因素 即P=S*cosΦ。
Transformer capacity is 100-630kVA, motor power is several-hundreds KW, kVA is regarded as work in, kW active power, Kvar is reactive power. The sum of the square of active power and reactive power is equal to apparent apparent power. Their relationship is as follows: active power = apparent power * power factor P = S * cos φ.
如一台400kVA容量的變壓器的長期負載最大不能超過400*0.83=330kW，（cosΦ取0.83）。
Such as a 400kVA capacity transformer long-term load can not exceed 400 * 0.83 = 330kw, (cos φ take 0.83) .
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