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

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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switching times on medium and high voltage Gas Insulated Switchgear

Effective and Safe Testing of GIS Switchgear

To fully assess the functionality of medium and high voltage circuit breakers, various mechanical and electrical parameters must be tested. Gas-insulated switchgear (GIS) in particular…
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A Closer Look into the True Cost of Replacing Electrical Switchgear

During my switchgear modernization presentations all over the US, I am constantly reminded of the concerns customers face with their aging electrical infrastructure. For the…
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Partial Discharge & Circuit Breaker Asset Management

Detecting and avoiding preventable failures BY JAY GARNETT, Doble Engineering Company While metal clad switchgear can be very reliable, sometimes operating for over 50 years,…
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digital protective relays

Global study finds continuing moderate growth in protective relay market with commitment to improving protection coordination and grid security practices

In 2016, Newton-Evans Research Company completed a six-month research study and survey of protective relay usage patterns in the world community of electric power utilities.…
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Vacuum Interrupter Testing for Circuit Breakers

How to predict field life using vacuum interrupters BY FINLEY LEDBETTER, Group CBS Utilities have widely replaced older air-magnetic and oil interrupters for circuit breakers…
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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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Breakers & Relays Articles

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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FERC Complaint Targets Duke, PJM Transmission Planning

FERC Complaint Targets Duke, PJM Transmission Planning

A coalition of large energy consumers and ratepayer advocates has filed a complaint with the…
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Power Factor Testing of Circuit Breakers

Power Factor Testing of Circuit Breakers

Detecting contamination and deterioration in SF6 breakers to ensure longevity BY LINDA NOWAK, Doble Engineering…
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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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Protective Relay Frustrations

Protective Relay Frustrations

Solving misoperation with line parameter measurements BY WILL KNAPEK, OMICRON USA Between 80 to 90…
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