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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