已知变压器容量500高压进线10KV低压出线0.4KV请问怎么选择高低压进出线电缆截面,越详细越好

2024-12-16 15:09:24
推荐回答(4个)
回答1:

变压器额定电流的计算公式为
高压侧:容量/1.732/10
低压侧:容量/1.732/0.4
所以10KV/0.4KV 500KVA的油侵变压器
高压侧最大额定电流为28.8A
低压侧最大额定电流为721.7A
高压侧电缆选35mm2足够
低压侧若按额定电流敷设电缆,全铜电缆直埋敷设的话要超过300~400mm2截面,架空敷设的话240mm2就差不多了。
其实,选用电缆也有学问的,低压动力线因其负荷电流较大,故一般先按发热条件选择截面,然后验算其电压损失和机械强度;低压照明线因其对电压水平要求较高,可先按允许电压损失条件选择截面,再验算发热条件和机械强度。

回答2:

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回答3:

高压侧电流30A,选用35的电缆吧。
低压侧电流720A,选用60X6铜排为主母排,引至分开关后根据具体出线负荷选用相应电缆。

回答4:

高压电缆应该是500KVA的额定电流的1至10倍选择电缆;低压是500KVA的额定电流的1.25至3倍选择电缆。

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