电气控制元件及符号的.ppt

常用的电气图形符号 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 刀开关 ﹡刀开关(Knife Switch)是一种最简单的手动电器，它由静插座、手柄、触刀、铰链支座和绝缘底板组成。刀开关在低压电路中，用于不频繁接通和分断电路，或用来将电路与电源隔离，此时又称为“隔离开关”。 按极数不同刀开关分单极(单刀)、双极(双刀)和三极(三刀)3种，它们在电路图中的符号如图所示。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 刀开关 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 断路器（空气开关） 断路器(Circuit Breaker)又称空气开关或自动开关。在功能上，它相当于闸刀开关、热继电器、过电流继电器和欠电压继电器的组合，能对电路进行过载、短路、欠电压保护，用于不频繁分、合电路。典型的低压断路器结构原理。它主要由触头系统、灭弧装置、保护系统和操作机构组成。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 断路器（空气开关） 1-主触点   2-自由脱扣机构   3-过电流脱扣器   4-分励脱扣器5-热脱扣器   6-欠电压脱扣器   7-停止按钮 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 按钮 按钮(Push Button)通常用于发出操作信号，接通或断开电流较小的控制电路，以控制电流较大的电动机或其他电气设备的运行。 按钮的结构，由按钮帽、动触点、静触点和复位弹簧等构成。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 按钮 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 熔断器 熔断器(Fuse)是最简便而且是有效的短路保护电器，串接在被保护的电路中。 熔断器的熔片或熔丝用电阻率较高的易熔合金制成，如铅锡合金等；或用截面积甚小的良导体制成。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 熔断器 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 接触器 交流接触器是利用电磁吸力工作的自动控制电器。 它主要是由电磁铁和触点组两部分组成。电磁铁的铁心分上、下两部分，下铁心是固定不动的静铁心，上铁心是可以上下移动的动铁心。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 接触器 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 热继电器 Evaluation only. Created with As