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When Should You Choose a Zinc Oxide Surge Arrester Tester? – Frequently Asked Questions

2025-09-17
Latest company news about When Should You Choose a Zinc Oxide Surge Arrester Tester? – Frequently Asked Questions

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.


1. Do new arresters need testing?

 Yes. Test before installation or commissioning to set baseline data.

2. How often should they be tested?

 Every 1–2 years, checking leakage current, resistive current, and reference voltage.

3. When should testing be done immediately?

 After:

  • Visible damage (cracks, discharge marks)

  • Moisture or dirt on the base or housing

  • Lightning strikes or switching surges

  • Leakage current alarms

4. During overhauls or maintenance?

 Yes. Include surge arrester testing in scheduled inspections or repairs.

Benefits of a Tester

  • Accurate leakage current measurement (separates resistive and capacitive parts)

  • On-line testing without disassembly

  • Works with various voltage levels for substations and transmission lines

Summary

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.



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