保定电气厂家价格-交流无间隙金属氧化物避雷器

金属氧化物避雷器的优点

Advantages of metal oxide arrester

只有压敏电阻片的新型避雷器，压敏电阻片是由氧化锌等金属氧化物烧结而成的多晶半导体陶瓷元件，具有理想的阀特性。同时具有非线性系数小、保护特性好、能量吸收能力强、通流能力大、结构简单和稳定性好等优点。

The varistor is a new type of arrester with varistor. The varistor is a polycrystalline semiconductor ceramic element sintered by Zinc Oxide and other metal oxides. It has ideal valve characteristics. At the same time, it has the advantages of small nonlinear coefficient, good protection characteristics, strong energy absorption ability, large flow capacity, simple structure and good stability.

非线性系数α 值很小。在金属氧化物阀片中通过1mA～10kA这个范围内电流时，α 值一般在0.02～0.06之间。在额定电压作用下，通过的电流极小，因此可以做成无间隙避雷器。保护性能好。它不需要间隙动作，电压一旦升高，即可迅速吸收过电压能量，抑制过电压的发展；有良好的陡度响应特性；无间隙的氧化物避雷器的性能几乎不受温度、湿度、气压、污秽等环境条件的影响，因而性能稳定。

The coefficient of nonlinearity is small. When the current is in the range of 1mA to 10kA in the metal oxide valve plate, the alpha value is generally between 0.02 and 0.06. Under the rated voltage, the current is very small, so it can be made into a gapless arrester. Good protection performance. It does not require action of gap, once the voltage increases, can quickly absorb over-voltage energy, restrain overvoltage development; good steepness response characteristics; influence the performance of oxide arrester without gap is almost not affected by temperature, humidity, pressure, pollution and other environmental conditions, and stable performance.

金属氧化物避雷器基本无续流，动作负载轻，耐重复动作能力强。伏安特性是对称的，没有极性问题，可制成直流避雷器。

Metal oxide surge arrester has no continuous flow, the action load is light, and the ability to repeat action is strong. The volt ampere characteristic is symmetrical, without polarity problem, it can be made into DC arrester.

通流容量大。避雷器容易吸收能量，没有串联间隙的制约，仅与阀片本身的强度有关。同碳化硅阀片比较，氧化物阀片单位面积的通流能力大4～4.5倍。因此，用这样的阀片制成避雷器，不但可以限制大气过电压，而且完全可以用来限制操作过电压，甚至还可以耐受一定持续时间的短时（工频）过电压。

Large flow capacity. Arrester is easy to absorb energy, without series gap constraints, only related to the strength of the valve itself. Compared with the silicon carbide valve plate, the flow capacity of the oxide valve per unit area is 4 to 4.5 times larger. Therefore, the lightning arrester made of such a valve can not only limit the atmospheric overvoltage, but also can be used to limit the operation over-voltage, and even withstand a certain duration of short-term (power) over-voltage.

结构简单，尺寸小，易于大批量生产，造价低。

The utility model has the advantages of simple structure, small size, easy production in large quantities and low cost.

适用于多种特殊需要。金属氧化物避雷器耐污性能好，不会由于污秽或者带电清洗时改变外套表面电位分布而影响避雷器的性能。同时，由于阀片不受大气环境影响，能适应于各种绝缘介质，所以也适用于高海拔地区和6 SF 全封闭组合电器等多种特殊需要。

It is suitable for many special needs. Metal oxide arrester has good pollution resistance, and it will not affect the performance of arrester because of the change of the surface potential distribution of the coat when it is polluted or charged. At the same time, because the valve plate is not affected by atmospheric environment, it can be applied to all kinds of insulating media, so it is also suitable for various special needs such as high altitude area and 6 SF fully enclosed electrical appliances.

金属氧化物避雷器有一系列优点，发展潜力很大，是世界各国避雷器发展的主要方向，必将逐步取代传统的带间隙的避雷器，也将是未来特高压系统关键的过电压保护设备。

Metal oxide arrester has a series of advantages, and has great potential for development. It is the main direction of the development of arrester in the world. It will gradually replace the traditional lightning arrester with gaps, and will also be the key over-voltage protection equipment in the future UHV system.