The arrester online monitor is applicable to various valve arresters in the AC power grid. It can monitor the continuous current through the arrester under the operating voltage on-line. By observing the change of the continuous current, it can effectively detect the abnormality such as aging or damp inside the arrester and avoid The arrester has a faulty operation. The arrester online monitor function and the operation and maintenance arrester online monitor are applicable to various valve arresters in the AC power grid. They can monitor the continuous current through the arrester under the operating voltage on-line, and can effectively detect the arrester by observing the change of continuous current. Abnormalities such as internal aging or moisture, to avoid the faulty operation of the arrester. The contamination table 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 times the arrester has been operated.
Surge arrester online monitor operation and maintenance
1 When the lightning arrester online monitor observes the dust on the glass on the hole, it can be wiped off with cloth or paper. There should be no small water drops in the glass. If a large amount of water drops are found, the sealing performance of the monitor has been damaged. Contact us for replacement.
2 After the arrester online monitor is put into operation, observe whether the mA meter indications in each phase monitor are basically the same. The patrol personnel are required to pay attention to the observation and record in time. Once the mA meter indicates that the change is abnormal and the red tube of the individual phase monitor is bright, it should be promptly reported to the relevant parties.
3 When the operating voltage fluctuates, the mA meter indication in the arrester monitor will change slightly, which is normal.
4 If there is a significant change in the mA meter indication of one of the monitors in the operating arrester online monitor, please refer to the following inspection process:
A zinc oxide surge arrester consisting of two or more components, in which a defect occurs inside a component, and when it is gradually developed, the mA meter indication in the lightning arrester online monitor gradually increases, and if it is 30% larger than the original value, it must be vigilant. If it is 50% larger than the original value, it needs to be retired in time, otherwise an accident will occur.
If the arrester monitor monitors a single-element lightning arrester, such as a 110 kV voltage class arrester, it is mostly composed of single-section components. [After the rain is wet, the JCQ-type mA meter can not distinguish whether the inside of the porcelain sleeve or the outer leakage of the porcelain sleeve increases. Large, single-element arresters are damp inside, and may not last until after the rain.
If the indication value of the mA meter is reduced or even returned to the zero position, there may be a lot of false or short circuit insulation on the insulation base, or the internal components of the meter or monitor may be damaged. At this time, the digital voltage multimeter is used to measure the voltage across the monitor. If the voltage is lower than 3V or no voltage, the insulation level of the insulation base is lowered or short-circuited. If the voltage is about 8-10V, the header or component in the monitor is damaged.
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