电厂及变电站接地网牺牲阳极保护原理 一、变电站中的接地网起到什么作用 接地网起到保护作用,合格的接地网可以有效的保证用电设备的漏电安全,对霹雷也有帮助。接地棒的工作原理 不论外部安装避雷针还室装设的避雷器其较终目的都是将入侵雷电能量或内部浪涌(过电压)引导泄流入地,以避免雷击伤害,因此较终的泄流入地是整个防雷工程的关键,接地是保证电流安全迅速泄入大地的重要环节。 二、变电站接地网原理 1,接地网是由若干个接地较(接地桩)连接而成,它相当于若干接地较并联,可以有效的降低接地电阻。工作接地和保安接地都同时接入接地网。 2,接地网和大地之间的电阻称为接地电阻,接地电阻越小越好。实践中接地电阻不可能等于零,所以根据接地性质作出了不同的规定。 Principle of sacrificial anode protection for grounding grid of power plant and substation 1、 What role does the grounding network play in the substation The grounding grid plays a protective role. A qualified grounding grid can effectively ensure the leakage safety of electrical equipment and is also helpful for lightning. Working principle of grounding rod No matter whether the lightning rod is installed externally or the lightning arrester is installed in the room, its ultimate purpose is to guide the invasion of lightning energy or internal surge (overvoltage) to the ground to avoid lightning damage. Therefore, the final leakage to the ground is the key to the whole lightning protection project, and grounding is an important link to ensure the safe and rapid discharge of current to the ground. 2、 Principle of substation grounding grid 1. The grounding grid is connected by several grounding electrodes (grounding piles). It is equivalent to several grounding electrodes in parallel, which can effectively reduce the grounding resistance. Both working grounding and security grounding are connected to the grounding grid at the same time. 2. The resistance between the grounding grid and the ground is called the grounding resistance. The smaller the grounding resistance, the better. In practice, the grounding resistance cannot be equal to zero, so different regulations are made according to the grounding property.
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杂散电流对管道断电电位的影响直流杂散电流的影响 当管道受直流杂散电流干扰时,不能用电源通断的方式测量管道断电电位。直连牺牲阳极的影响当牺牲阳极与管道在地下直连时,不能用电源通断的方式测量管道断电电位。交流极性排流器的影响当管道上安装有交流电流极性排流器时,不能用电源通断的方式测量管道断电电位。极性排流器对交流电有整流作用,将产生半波整流的直流电流从接地较经土壤流向管道,导致管
管道自然电位测量1、管道埋地后,阴极保护电源开启之前测量的管地电位为管道的自然电位。测量时,电压表黑表笔连接参比电极,红表笔连接管道测试线,电压读数为管道自然电位。2、如果地表干燥,应当浇水湿润。如果参比电极在沥青路面、水泥路面上或土壤结冻,应该钻孔,浇水与下方土壤接触。3、管道自然电位应在-200~-800mVcse之间,如果自然电位数值**出该范围,应调查管道是否受到杂散电流干扰。当管道受到交流
主要用于阴极保护参数的检测,是管道管理维护中必不可少的装置,按测试功能沿线布设。测试桩可用于管道电位、电流、绝缘性能的测试,也可用于覆盖层检漏及交直流干扰的测试。测试桩是一种专门用于管道阴极保护配以电位测试探头对保护管道进行测试的附属设备。测试桩的功能分类1.电位测试桩:主要用于检测保护电位。2.牺牲阳极测试桩:用于连接牺牲阳极,测量牺牲阳极的性能参数。3.电流测试桩:测量管中电流。保护效果测试桩
阳极地床、管道的接地电阻测量步骤①在恒电位仪没有工作时,测量阳极地床的自然电位、管道的自然电位。②在恒电位仪开始工作后,测量阳极地床的通电电位、管道的通电电位。③测量恒电位仪的输出电压、电流、设定电位。④关掉恒电位仪的瞬间,测量阳极地床和管道的断电电位。⑤阳极地床的通电电压减去断电电位,除以恒电位仪输出电流,即为阳极地床接地电阻。⑥管道的通电电位减去断电电位,除以输出电流,即为管道的接地电阻。⑦测
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