Zinc Oxide arresters are surge arresters with good protection properties. Utilizing the good nonlinear volt-ampere characteristic of zinc oxide, the current flowing through the arrester at the normal operating voltage is very small (microamperes or milliamperes); when overvoltage is applied, the resistance drops sharply and the energy of the over-voltage is discharged. To achieve the effect of protection. The difference between this arrester and the traditional arrester is that it does not have a discharge gap and uses the non-linear characteristics of zinc oxide to act as a drain and break.
Common faults are mainly caused by the following reasons:
Analysis of the causes of poor sealing: The bad seal of the arrester is mainly produced in the production process of the product. Such as lightning arrester valve drying is not complete, moisture content. Or when assembling, the gasket of the arrester is not properly positioned or even installed. Some manufacturers use unsatisfactory materials, such as the use of poor quality porcelain bottles, with invisible holes will also cause water infiltration, so that the internal moisture.
Precautionary measures: In order to prevent the arrester from being poorly sealed, the user should conduct a strict seal test before use. In addition, during the operation and maintenance of the arrester, especially after a thunderstorm, it is necessary to strengthen the inspection of the arrester to detect abnormal conditions in time. When conducting regular preventive tests on arresters, testers must carefully analyze the test data. When the arrester is wet, it may not show any problems in its appearance, but the internal defects can only be found through the test data.
Internal valve aging analysis: The valve aging is generally generated during operation. Due to the poor uniformity of the arrester valve, the degree of aging is not the same, it will make the valve potential distribution uneven. After a period of operation, some of the valve plates deteriorate first, causing the arrester leakage current and power loss to increase.
Since the grid voltage is constant, the burden on the rest of the normal valves in the surge arrester will increase, leading to an accelerated aging rate. In this way, a vicious circle is formed, which eventually leads to internal breakdown of the lightning arrester and single-phase grounding or arrester body explosion.
Another cause of accelerated aging of the zinc oxide surge arrester is the low operating voltage of the arrester. This will cause the operation of the process, especially when the system occurs single-phase grounding, will greatly increase the arrester load, resulting in rapid aging of the valve.
Precautionary measures: In addition to asking the manufacturer to improve the production process and improve the uniformity of the valve plate for the aging problem of the arrester valve plate, it is also necessary to select an arrester with sufficient rated voltage and continuous operating voltage when designing and selecting the type. In addition, during inspections, not only the appearance of the arrester should be checked for broken flashovers, but also the value of the leakage current of the arrester should be copied and compared with the initial value. If the value is too large, the defect should be promptly reported and treated. .
Zinc Oxide Arrester is of great significance in actual production and life, so it should be paid attention to to ensure that the arrester can play a normal role. Recommend a more practical ybl-iii zinc oxide arrester tester parameters for your reference:
1, current measurement range: 0 ~ 10mA (peak)
2, voltage input range: 10 ~ 200V (peak, reference voltage input)
3, the maximum allowable error: ± (reading '3% ± 1 words) (under wired mode conditions)
4. Power supply of instrument: AC220V or internal battery continuous working time is less than 6 hours, battery charge is greater than 6 hours 5. Instrument size: 330×280×140mm3
6, the weight of the instrument: 3kg (without accessories)
Common faults are mainly caused by the following reasons:
Analysis of the causes of poor sealing: The bad seal of the arrester is mainly produced in the production process of the product. Such as lightning arrester valve drying is not complete, moisture content. Or when assembling, the gasket of the arrester is not properly positioned or even installed. Some manufacturers use unsatisfactory materials, such as the use of poor quality porcelain bottles, with invisible holes will also cause water infiltration, so that the internal moisture.
Precautionary measures: In order to prevent the arrester from being poorly sealed, the user should conduct a strict seal test before use. In addition, during the operation and maintenance of the arrester, especially after a thunderstorm, it is necessary to strengthen the inspection of the arrester to detect abnormal conditions in time. When conducting regular preventive tests on arresters, testers must carefully analyze the test data. When the arrester is wet, it may not show any problems in its appearance, but the internal defects can only be found through the test data.
Internal valve aging analysis: The valve aging is generally generated during operation. Due to the poor uniformity of the arrester valve, the degree of aging is not the same, it will make the valve potential distribution uneven. After a period of operation, some of the valve plates deteriorate first, causing the arrester leakage current and power loss to increase.
Since the grid voltage is constant, the burden on the rest of the normal valves in the surge arrester will increase, leading to an accelerated aging rate. In this way, a vicious circle is formed, which eventually leads to internal breakdown of the lightning arrester and single-phase grounding or arrester body explosion.
Another cause of accelerated aging of the zinc oxide surge arrester is the low operating voltage of the arrester. This will cause the operation of the process, especially when the system occurs single-phase grounding, will greatly increase the arrester load, resulting in rapid aging of the valve.
Precautionary measures: In addition to asking the manufacturer to improve the production process and improve the uniformity of the valve plate for the aging problem of the arrester valve plate, it is also necessary to select an arrester with sufficient rated voltage and continuous operating voltage when designing and selecting the type. In addition, during inspections, not only the appearance of the arrester should be checked for broken flashovers, but also the value of the leakage current of the arrester should be copied and compared with the initial value. If the value is too large, the defect should be promptly reported and treated. .
Zinc Oxide Arrester is of great significance in actual production and life, so it should be paid attention to to ensure that the arrester can play a normal role. Recommend a more practical ybl-iii zinc oxide arrester tester parameters for your reference:
1, current measurement range: 0 ~ 10mA (peak)
2, voltage input range: 10 ~ 200V (peak, reference voltage input)
3, the maximum allowable error: ± (reading '3% ± 1 words) (under wired mode conditions)
4. Power supply of instrument: AC220V or internal battery continuous working time is less than 6 hours, battery charge is greater than 6 hours 5. Instrument size: 330×280×140mm3
6, the weight of the instrument: 3kg (without accessories)
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