【正文】 levels of overvoltage surge protectors of the current step by step into the land of China, Substation secondary safety equipment and reliable operation. 1 second overvoltage substation protection In recent years, the substation munications, munications systems, protection systems, background management module frequent overvoltage damage, the main reason for this is weak and its related systems products overvoltage protection level is weak, or no guard against overvoltage Technical measures, the consequences for the safe operation of power grids bring about a greater negative impact. With integrated automation systems and automation systems such as munication systems in the substation weak secondary by the wider use of such electronic systems (equipment) ponents of the integrated more and more, the growing volume of information storage, speed and accuracy of the Increased and operates only a few volts, current information only microamp level, thus extremely sensitive to outside interference, especially the lightning and electromagic pulse, such as overvoltage tolerance is low. When thunder and lightning, such as overvoltage and acpanied by the electromagic fields reach a certain threshold, ranging from system failure caused, resulted in heavy equipment or permanent damage to its ponents. Despite the thunder and lightning viewpoint of electronic systems (equipment) is unlikely, but lightning strike near the land, buildings, munication and air supply line directly Leiyun discharge form, or because of electrostatic induction and the impact of electromagic induction formation of overvoltage, There might be connected to the power lines, signal lines or grounding system, through various interfaces to transfer, coupling, radiation and other forms of invasive electronic system (equipment) and lead to serious disturbances or incidents. Therefore, strengthening and improving the electronic system (equipment) protection, to minimize the impact of interference by lightning and other damage caused direct losses and indirect losses, has bee the urgent need to solve the problem. 2 overvoltage protection design IEC (International Electrotechnical Commission) TC/81 mine technical mittee will be divided into internal and external mine mine in two parts, the external mine is lightning rod (or with lightning, lightning work), Yin Xiaxian and grounding system, Objects to be protected from direct lightning strikes, mine is to prevent internal lightning and other internal overvoltage damage caused by invasive equipment. A prehensive mine and overvoltage protection systems must be integrated use of discharge (segregation), both pressure (and other potential), shielding (isolation), grounded, limit pressure (clamp) protection, and other technology, in accordance with the external mine And the principle of internal mine, in accordance with the targets of protective features, flexible application to take concrete measures, constitute a plete protection system. Overvoltage substation in the form are: Lightning overvoltage, the resonant frequency overvoltage and overvoltage, overvoltage operation, these overvoltage transmission or electromagic induction to the way the lines and equipment on a dangerous overvoltage, in particular, Lightning overvoltage, lightning substation, in the lowvoltage power supply system and weak system to produce a strong overvoltage sensor, while the substation to potential rise (for example: the substation grounding resistance to 1 Q, lightning current 10 kA, while the potential for 10 kV), due to the increased potential of the counter lines and equipment damaged lines and equipment and the events have occurred, therefore, despite the substation outside the mine system (lightning rod. Yin Xiaxian And grounding devices) in line with national standards and the requirements of Buban, and the integrated automation and munications automation systems, such as weak secondary have been taken, such as shielding, grounding, isolation, filtering, and other measures, but it can not pletely avoid overvoltage powerful lightning And voltage of the sy