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发表人:hongdaneng |
发表时间:2005/7/8 17:45:00 |
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变频器输出电抗器的作用是什么?在实际应用中,必须要加吗?请高人赐教! |
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以下是关于《变频器输出电抗器的作用》论题的回复(共6篇) |
回复:减少变频器对电网的谐波干扰
减少变频器对电网的谐波干扰
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我们的服务宗旨:是什么质量,就说什么货,决不欺骗客户。
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说说变频器有时要加输出电抗器吧,一般根据现场环境及场地的不同要求,很多变频器都是统一安装在电房,当然也有直接安放在现场的,装在电房就有个电缆长度的问题,每种型号的变频器都有允许的最大电缆长度,尤其是运行中改造新加变频器的话,往往会碰到电缆长度比较长的情况,随着变频器输出电缆的长度增加,其分布电容明显增大,从而造成变频器逆变输出的容性尖峰电流过大引起变频器跳闸保护,因此必须使用输出电抗器或du/dt滤波器或正弦波滤波器等装置对这种容性尖峰电流进行限制。输出滤波电抗器用于补偿在电机电缆长距离敷设时引起的线路电容充电电流,也可抑制谐波.因此,关于变频器敷设的电机电缆在超过多长距离时应加装输出滤波电抗器,还应参阅各变频器生产厂商提供的使用手册。所以问题的关键是看变频器厂家是怎么要求的!
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