Breakers & Relays

Circuit Breaker Time and Motion Testing

Determining mechanical condition of high-voltage circuit breakers BY JOZEF LEVI, Doble Engineering Company Life expectancy of a newly installed high-voltage circuit breaker is approximately 40…
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Latest Electrical Industry News

Protective Relay Frustrations

Solving misoperation with line parameter measurements BY WILL KNAPEK, OMICRON USA Between 80 to 90 percent of all power system faults involve ground. Many protective…
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Smart Substations and Their Role in the Evolving Smart Grid

A Smart substation digitizes protection and control, enabling utilities to detect faults faster, manage DER volatility, and reduce outage risk. The payoff depends on architecture,…
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Extend the Life of Your Circuit Breakers

What to ask to ensure proper circuit breaker testing and maintenance BY ROBERT FOSTER, Megger Protecting a utility’s assets is essential. There are many different…
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Dynamic Resistance Measurement

Condition testing of circuit breaker’s arcing contacts BY BUDO MILOVIC, DV-Power The preventive maintenance on a high-voltage (HV) breaker consists of several routine tests. The…
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Power Factor Testing of Circuit Breakers

Detecting contamination and deterioration in SF6 breakers to ensure longevity BY LINDA NOWAK, Doble Engineering Company The purpose of “Doble testing”, or power factor testing,…
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Utilizing Fault Resistance to Test Distance Relays

Taking power grid protection to an all-new level BY JASON BUNEO & RENE AGUILAR, Megger The testing of distance relays has evolved from testing simple…
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Protection of Electrical Power Transformers

INTRODUCTIONIn most large electrical systems, generators and power transformers are the two most expensive pieces of equipment. In addition to the capital cost of purchase,…
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Breakers & Relays Articles

Effective and Safe Testing of GIS Switchgear

Effective and Safe Testing of GIS Switchgear

To fully assess the functionality of medium and high voltage circuit breakers, various mechanical and…
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Reconditioned SF₆ Gas: An Environmentally Friendly Alternative

Reconditioned SF₆ Gas: An Environmentally Friendly Alternative

When it comes to medium and high voltage circuit breakers, there is no better electrical…
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Storm-Hardened Switchgear

Storm-Hardened Switchgear

How to protect electrical equipment from Mother Nature BY ROBERT A. MURPHY, Trayer Engineering Corporation…
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Selecting Substation Medium-Voltage Switchgear: GIS vs. AIS

Selecting Substation Medium-Voltage Switchgear: GIS vs. AIS

Understanding differences between GIS and AIS in five points BY GAETAN DJENANE, Schneider Electric, Inc.…
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