为避免长电缆产生驻波,变频器与电动机之间连接电缆长度应尽量短,更不能将过长的电缆盘成圈状放在机柜内。变频器进线电缆应套上长约1.5~2米的金属蛇皮管,蛇皮管外壳要可靠接地。
《节约能源法》已将变频调速列入通用节能技术加以推广。但变频器是非线性设备,运行中必将会引起正弦波形畸变而产生高次谐波,这不仅是电网“公害”,而且还将对电气设备造成危害并增加损耗。只有采取一系列的谐波治理措施,变频调速的优越性必将得到更好发挥,为变频调速技术的推广应用节能降耗开辟新境界。
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