Composite Insulator Zinc Oxide Arrester

Composite insulator zinc oxide arrester is an overvoltage protector, mainly used to protect various electrical equipment (transformers, switches, capacitors, wave arresters, transformers, generators, motors) in power systems, railway electrical systems, and communication systems , power cables, etc.) are protected from damage by atmospheric pressure overvoltage, operating overvoltage and power frequency transient overvoltage, which is the basis for the insulation coordination of the power system.

The core component (resistor) of the metal oxide arrester adopts an advanced formula based on zinc oxide and has very excellent volt-ampere characteristics. That is, under normal operating voltage, the current passing through is only microampere level. When subjected to When overvoltage occurs, the passing current reaches thousands of amperes in an instant. The arrester is in a conducting state and releases the overvoltage energy, thereby effectively limiting the damage of overvoltage to power transmission and transformation equipment.

Traditional silicon carbide arresters have shortcomings such as high steep wave discharge voltage caused by steep wave discharge delay and high operating wave discharge voltage due to large operating wave discharge dispersion. Zinc oxide arresters have good steep wave response characteristics, no delay to steep wave voltage, low operating residual voltage, and no discharge dispersion. The protection margin of steep waves and operating waves is greatly improved, and in terms of insulation coordination, the protection margins of steep waves, lightning waves and operating waves can be nearly consistent, thereby providing the best protection for power equipment.

Composite insulator zinc oxide arrester adopts integral injection molding and two-end encapsulation process. It has zero sealing performance and excellent explosion-proof performance. It is resistant to pollution and requires no cleaning, which can reduce the occurrence of wet flash in foggy days. It is resistant to electric corrosion and aging, small in size and light in weight. Easy to install and maintain. It is an updated product of the porcelain sleeve arrester.

The normal usage conditions of conventional products are as follows:
* Ambient temperature: not higher than +40℃, not lower than -40℃;

* Altitude: no more than 2000m;

* Power frequency: 50±2Hz; 60±2Hz;

* Earthquake intensity: below 7 degrees;

* Maximum wind speed: 35m/s;

* Conditions for cleaning exemption: moderately dirty areas and below;

* For products without gaps, the long-term applied power frequency voltage shall not exceed the continuous operating voltage of the arrester;

For products with gaps, the short-term power frequency voltage increase at the installation point shall not exceed the rated voltage of the arrester.

For long-term use under the following abnormal conditions, the arrester needs to be specially made. Please specify when ordering:

* Temperature or altitude exceeding the standard (plateau, tropical, cold zone, fully enclosed cabinet, close to electric furnace, etc.)

* The use environment contains severe moisture or corrosive gas impurities (water, salt fields, chemical plants, etc.);

* Strong ultraviolet radiation (plateau, arid areas with strong sunshine, etc.);

* Extremely polluted areas (mine working faces, construction site working faces, etc.).

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