HuaTianLogo

Power detection technology / Power detection

Detection Technology

Operation problems of zinc oxide arrester tester

time:2021/6/16   source:华天电力  reading:439 time

1. The main problems in the operation of zinc oxide arresters


1. Because the zinc oxide arrester has cancelled the series gap, it bears the system voltage and current flows for a long time. The active component of the current generates heat on the valve plate, which induces changes in the volt-ampere characteristics. The result of long-term action will cause the valve plate to age and even thermal breakdown.


2. When the zinc oxide arrester is used by impulse voltage, the valve plate will also age under the action of impulse voltage energy.


3. Moisture inside the zinc oxide arrester or poor insulation performance will increase the power frequency current, increase the power consumption, and cause internal discharge in severe cases.


4. The zinc oxide arrester is polluted by rain, snow, condensation or dust. Due to the difference of internal and external electricity release, there is a relatively potential difference between the internal valve plate and the external ceramic sleeve, which leads to the occurrence of radial discharge.


2. Zinc Oxide Lightning Arrester Characteristic Tester The task to be completed by this instrument


To judge whether the zinc oxide arrester valve plate is aging or damp, usually observe the change of the leakage current that flows through the zinc oxide valve plate in normal operation, that is, observe whether the resistance increases as the judgment basis.


Zinc Oxide Arrester Tester.png


Three, zinc oxide arrester characteristic tester This tester is mainly for the following aspects


1. Thermal breakdown of zinc oxide arrester


The reason for the thermal breakdown of the zinc oxide arrester generator caused by the zinc oxide arrester characteristic tester is that its heating power is greater than the heat dissipation power. The heating power of the zinc oxide valve plate depends on the current and voltage on it (current is the active component of the current flowing through the valve plate).


2. Moisture inside the zinc oxide arrester


If the seal is not tight, it will cause moisture inside the arrester or moisture ingress during installation, which will increase the total current of the arrester under voltage. When the zinc oxide arrester characteristic tester is damp to a certain degree, discharge will occur along the surface of the zinc oxide valve plate or the inner wall of the porcelain sleeve, causing the arrester to explode.


The increase in the total current caused by the dampness of the zinc oxide lightning arrester is caused by the increase in the resistive leakage current. The zinc oxide arrester characteristic tester can infer whether it is damp or not by detecting the change range of the viewing angle.


In summary, the above faults of the zinc oxide arrester characteristic tester can be reflected by the change of the resistive leakage current. Knowing the changes in the resistive leakage current of zinc oxide, such as lightning arresters, can predict whether the above-mentioned failures will occur.


Copyright description: all articles, pictures, video and other materials on this site belong to wuhan huatian power automation co., LTD. For use, please contact us; Permission to reprint articles, pictures, video and other materials please quote "from: huatian power".

How to use the loop resistance tester?  | 2021/6/16 | reading417time Precautions for transformation ratio tester  | 2021/6/15 | reading278time return