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Talking about the working principle of composite jacket zinc oxide arrester

    At rated voltage, the current through the zinc oxide surge arrester is only 10-5a or less, which is equivalent to an insulator. Therefore, it can isolate the operating voltage and the spark-free gap of the valve flap. When the voltage of the metal arrester has a great influence on the voltage value (starting voltage) of the zinc oxide arrester, the valve plate is "conducted" to discharge a large current through the valve into the ground. At this time, the residual pressure does not exceed the pressure of the protected equipment for protection purposes. From then on, when the operating voltage drops below the operating voltage, the valve automatically terminates the "lead" state and restores the insulation state. Therefore, arc burning and fire fighting are no problem.

 


 
   

The main components of the 10kV AC power system, terminal modules, zinc oxide and other resistors are the main components of the arrester. He has good volt-ampere characteristics, and the zinc oxide resistive film is resistant to low resistance under atmospheric overvoltage and operating voltage. The residual pressure of the arrester is limited to the permissible value to provide reliable protection for the protected equipment. The disc suspension insulator exhibits a high resistance at the normal operating voltage of the arrester.

 

    In order to make the arrester only flow through the micro current, the zinc oxide resistor has a large square wave flow rate, which can meet the requirement of absorbing the overvoltage energy. The silicone rubber sheath, the insulating tube and the upper and lower gold fittings form a complete arrester, which makes the arrester have good anti-fouling, explosion-proof and moisture-proof performance.

 

    The leakage current meter is zero. The cause of this phenomenon may be: the meter shows a fault; the shield line is shorted to the ammeter. The treatment method is: hit the rice by hand, see if the card is dead, can not recover, should add missing sheets, repair or replace. The shield wire is separated from the conductive portion of the lightning rod and can return to normal.

 

    The large leakage current meter indicates: According to the historical data, if it is found that the electric meter is enough, it should be determined that there is a problem with the arrester. It should be reported to the dispatcher immediately, and the arrester is used up. Please check. The rupture discharge of the arrester porcelain sleeve. In the case of operating frequencies, the arrester sleeve is used to ensure the necessary insulation level of the arrester. If the porcelain casing is damaged or discharged, it will become an accident of the power system. In this case, it should be stopped and replaced in time.


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