| 金属氧化物避雷器 |
| 添加时间：2018/3/10 15:14:18 浏览次数： |
| 金属氧化物避雷器MOA的核心元件是金属氧化物电阻片（MOR），他的主要成分是氧化锌，约占90%。正常时工作在小电流区，在工作电压下呈现很大的电阻，流过MOA的电流很小，约0.1~0.2mA，可以近似认为是断开的。当系统产生过电压时，比如雷电入侵，在过电压作用下MOA呈现低电阻，对地导通，将过电压泄放，只有很小的残压，这样就可以保护其周围的设备不受过电压的危害。 The core element of the metal oxide arrester MOA is the metal oxide resistor (MOR), the main component of which is Zinc Oxide, which accounts for about 90%. Normally, it works in a small current area, and presents a great resistance at working voltage. The current flowing through MOA is very small, about 0.1~0.2mA, which can be regarded as disconnected approximately. When the system generates overvoltage, such as lightning invasion, under the action of overvoltage, MOA presents low resistance, which leads to overvoltage, and only a small residual voltage is released. This way, it can protect the equipment around it from being damaged by voltage. 避雷器的热稳定：避雷器长期承受运行电压，经过多次过电压冲击放电，性能可能变坏，在工作电压下的电流可能增大，导致发热增加，由于其是负温度特性，温度越高电流越大，恶性循环就可能最终导致MOA因温度过高超过了其散热能力而发生热崩溃现象。 The thermal stability of arrester: long-term under the operation voltage of arrester, after several overvoltage pulse discharge performance may deteriorate, current in voltage may increase, resulting in increased heat generation, because of the negative temperature characteristic, the higher the temperature the greater the current, can eventually lead to vicious spiral MOA due to high temperature than the heat capacity and thermal breakdown phenomenon. MOA的额定电压：是指在承受规定的雷电冲击或操作冲击后仍能耐受10s的最高工频电压有效值而不会发生热崩溃。 The rated voltage of MOA means that the maximum power frequency voltage of 10s is tolerated after a prescribed lightning shock or operation impact, without heat collapse. MOA的持续运行电压是指允许持续长久地施加在两端的工频电压有效值，一般额定工作电压是持续工作电压的1.25倍 The continuous operating voltage of the MOA is the effective value of the power frequency voltage allowed on both ends for a long time. The general rated working voltage is 1.25 times that of the continuous working voltage. |
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