Wuhan GDZX Power Equipment Co., Ltd sales@gdzxdl.com 86--17362949750
Zinc oxide surge arresters (MOAs) protect power equipment from lightning and switching overvoltage. Over time, their insulation and leakage current may change, so regular testing is important. Below are answers to common questions from our customers.
Yes. Test before installation or commissioning to set baseline data.
Every 1–2 years, checking leakage current, resistive current, and reference voltage.
After:
Visible damage (cracks, discharge marks)
Moisture or dirt on the base or housing
Lightning strikes or switching surges
Leakage current alarms
Yes. Include surge arrester testing in scheduled inspections or repairs.
Accurate leakage current measurement (separates resistive and capacitive parts)
On-line testing without disassembly
Works with various voltage levels for substations and transmission lines
Surge arresters are the grid’s first line of defense. Routine testing with a quality instrument prevents failures and outages.
Need advice on test intervals? Contact our team — we’ll create a plan based on your equipment and environment.
Tip:
A clear testing schedule plus reliable instruments = safe and stable power systems.