描述
負載曲線的平均負載系數(shù)越高,為達到損耗電能越小,要選用損耗比越小的變壓器;負載曲線的平均負載系數(shù)越低,為達到損耗電能越小,要選用損耗比越大的變壓器。將負載曲線的平均負載系數(shù)乘以一個大于1的倍數(shù),通??扇?-1.3,作為獲得最佳效率的負載系數(shù),然后按βb=(1/R)1/2計算變壓器應具備的損耗比。
1、變壓器損耗計算公式
(1)有功損耗:ΔP=P0+KTβ2PK——-(1)
(2)無功損耗:ΔQ=Q0+KTβ2QK——-(2)
(3)綜合功率損耗:ΔPZ=ΔP+KQΔQ—-(3)
Q0≈I0%SN,QK≈UK%SN
式中:Q0——空載無功損耗(kvar)
P0——空載損耗(kW)
PK——額定負載損耗(kW)
SN——變壓器額定容量(kVA)
I0%——變壓器空載電流百分比。
UK%——短路電壓百分比
β——平均負載系數(shù)
KT——負載波動損耗系數(shù)
QK——額定負載漏磁功率(kvar)
KQ——無功經濟當量(kW/kvar)
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