Utility Implemented Program to Monitor Condition of Station Arresters

December 9, 2017 • Arresters, ARTICLE ARCHIVE, Utility Practice & ExperienceComments (0)

To protect expensive assets at its substations, Elektroprenos BiH – the company operating the power system in Bosnia and Herzegovina – began installing metal oxide (MO) surge arresters in each of its HV transformer bays about 20 years ago. Over the years from 1996 to 2000, this investment program saw virtually all of their 110 ...

Read More



Tridelta Surge Arrester

What’s Next After Succession of Different Arrester ‘Eras’?

November 25, 2017 • Arresters, ARTICLE ARCHIVE, Woodworth on Arresters

Like many other things, the surge arrester was born of necessity. But while most might guess that arresters were introduced around the late 1800s when power lines first entered operation, they actually appeared 50 years earlier. Their initial function, in...

Read More

Field Testing Arresters with Hipot Testers

November 25, 2017 • Arresters, ARTICLE ARCHIVE

There are a number of effective ways to test an arrester in the field without necessarily having to rely on sophisticated equipment. This INMR article contributed by arrester specialist, Jonathan Woodworth discussed using an AC or DC Hipot, or dielectric...

Read More

Identifying Quality Surge Arresters

November 18, 2017 • Arresters, ARTICLE ARCHIVE

Power system engineers all face a similar dilemma at one time or other when trying to identify which product offers the quality they require – especially in today’s global market with its many competing suppliers. Yet making the right decision can prove...

Read More

Switching & Lightning Protection Using Externally Gapped Line Arresters

November 5, 2017 • Arresters, ARTICLE ARCHIVE

The goal of a lightning proof transmission line has been attainable since the early 1990s when the first polymeric-housed transmission line arresters became available. Indeed, based on IEEE 1410 and IEEE 1243, installation of arresters on every phase of every...

Read More

Arrester Protection Distances at Substations

October 21, 2017 • Arresters, ARTICLE ARCHIVE

Protection against overvoltages using gapless zinc oxide surge arresters is now widely adopted worldwide for electrical power networks. In particular, key assets such as transformers, cables and gas-insulated substations are vulnerable to transient surges...

Read More

Field Experience with EGLA Type Arresters in Mexico

October 14, 2017 • Arresters, ARTICLE ARCHIVE

Lightning has been a main cause of outages on transmission and distribution lines across the globe. In Mexico, for example, data from the Comision Federal de Electricidad (CFE) show that lightning caused more than 50% of registered line failures. To reduce...

Read More

Surface Temperature Considerations for Surge Arresters

October 7, 2017 • Arresters, ARTICLE ARCHIVE

Monitoring the health of MOV arresters over the past few decades has been dominated by measurement of third harmonic currents, better known as leakage current. Unfortunately, this method is complicated by the fact that the arrester needs to be isolated from...

Read More

INMR advertisers include: