Electric power industry consulting
Under the 50 Hz AC operating voltage there is a AC current inside the MOA. For a serviceable MOA, it is about 0.5 mA (some models can have up to 1 mA). If the current increases, then this is the basis for checking the MOA – this is the reasoning of those who lobby for
The photo shows a monitor (meter) for metal-oxide surge arrester (MOA). The device combines two functions: 1️⃣ To measure the «conduction current» passing through MOA under the influence of the AC operating voltage of the 50 Hz frequency. 2️⃣ To count the «number of impulses» through MOA. Both functions are absolutely useless! I will explain