1761-CBL-AH02

1761-CBL-AH02

1761-CBL-AH02

1761-CBL-AH02

1761-CBL-AH02

所谓变频器的过电压，是指由于种种原因造成的变频器电压超过额定电压，集中表现在变频器直流母线的直流电压上。正常工作时，变频器直流部电压为三相全波

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整流后的平均值。若以380V线电压计算，则平均直流电压Ud=1.35U线=513V。在过电压发生时，直流母线上的储能电容将被充电，当电压上升至700V左右时，(因机型而异)变频器过电压保护动作。

造成变频器过电压的原因主要有两种：电源过电压和再生过电压。

电源过电压是指因电源电压过高而使直流母线电压超过额定值。而现在大部分变频器的输入电压 可达460V，因此，电源引起的过电压极为少见。本文主要讨论的问题是再生过电压。

产生再生过电压主要有以下原因：当大GD2(飞轮力矩)负载减速时变频器减速时间设定过短;电机受外力影响(风机、牵伸机)或位能负载(电梯、起重机)下放。由于这些原因，使电机实际转速高于变频器的指令转速，也就是说，电机转子转速超过了同步转速，这时电机的转差率为负，转子绕组切割旋转磁场的方向与电动机状态时相反，其产生的电磁转矩为阻碍旋转方向的制动转矩。所以电动机实际上处于发电状态，负载的动能被"再生"成为电能。

再生能量经逆变部续流二极管对变频器直流储能电容器充电，使直流母线电压上升，这就是再生过电压。因再生过电压的过程中产生的转矩与原转矩相反，为制动转矩，因此再生过电压的过程也就是再生制动的过程。

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NIKON 4S015-046 NK386SX BLADE A-001

ASTeX AX8200 AX8200A Ozone Generator

MATROX MGA-MIL/4/DELL 00053248 PCI BOARD

IFB ADD ON BOARD TKB2151 AP9E-0209A-11 W/ STP IF BOARD

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SUNRA 120 DC 650MHz 1GB 73GBX2 HDD 3321469-3 NIB 


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AudioCodes Trunkpack-200 & txb-22 & txb-10 PCI

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1761-CBL-AH02