Arrester online monitor function and operation maintenance

The arrester on-line monitor is applicable to various valve surge arresters in the AC power grid. It can monitor the continuous current passing through the arrester under the operating voltage on line. By observing the continuous current change, it can effectively detect the internal aging or moisture absorption of the arrester and avoid abnormalities. Arrester with faulty operation. The contamination meter in the monitor can be used to monitor the degree of contamination of the arrester porcelain sleeve, and the counter can be used to record the number of operations of the arrester.

Surge Arrester Online Monitor Operation and Maintenance

1 Lightning arrester On-line monitor Observe the dust on the glass on the hole. When observing, use cloth or paper to wipe off the dust. There can be no small water droplets in the glass. If a large amount of water droplets are found, the seal performance of the monitor has been damaged. Contact the company for replacement.

2 After the arrester on-line monitor is put into operation, observe whether the milliampere meter indicators in each phase monitor are basically the same. Inspectors are required to pay attention to observation and record in time. Once it is found that the change in the indication of the milliammeter indicator is abnormal and the red LED of the individual phase monitor is bright, it must be reported to the relevant parties in a timely manner.

3 When the operating voltage fluctuates, there will be a slight change in the milliammeter indication in the arrester monitor . This is normal.

4 If there is a noticeable change in the milliammeter indication of a certain monitor in the operating surge arrester on-line monitor, refer to the following inspection process:

When a zinc oxide surge arrester consisting of two or more components contains a defect inside a component and gradually develops, the milliampere meter indication in the arrester on-line monitor gradually increases, and if it is increased by more than 30% from the original value, it must be vigilant. If the original value is increased by 50%, it must be decommissioned in time, otherwise an accident may occur.

If the arrester monitor monitors a single-element surge arrester, such as a 110-kilovolt voltage class arrester, it is mostly composed of single-element components. [When damped on a rainy day, JCQ-type milliammeters cannot distinguish between the inside of the porcelain sleeve or the external leakage current of the porcelain sleeve. Large, single component surge arresters are damp inside and may not continue to fail after rain.

If the indication value of the milliammeter is reduced or even returned to zero, there may be a lot of false insulation or short circuit in the insulation base insulation, and it may be that the header or the internal components of the monitor are damaged. At this time, use digital multimeter AC voltage block to measure the voltage across the monitor (see the use of multimeter), if the voltage is lower than 3V or no voltage, it shows that the insulating base insulation level drops or short circuit. If the voltage is about 8-10V, the watch head or components in the monitor have been damaged.

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