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Motor Protection


Setting Motor Protection Relays for Different Starting Methods

Motor Protection Relays (MPRs) play a vital role in safeguarding motors from electrical and mechanical stresses. The starting method employed for a motor significantly influences its starting characteristics and protection requirements. Properly setting MPRs according to the starting method is...

Transformer Protection


Solid-State Transformer Protection: A Game Changer?

The advent of solid-state transformer (SST) technology marks a significant evolution in the field of electrical transformer protection. Moving beyond the limitations of conventional oil-filled transformers, SSTs offer a promising alternative, boasting enhanced efficiency, reliability, and a host of...

Cybersecurity for Protective Devices


Advancements in Encryption for Protective Devices

The secure communication between protective devices in electrical systems is paramount for reliable and safe operation. With the growing prevalence of cyber threats targeting critical infrastructure, robust encryption technologies are essential to safeguard sensitive data and prevent unauthorized...

Overcurrent and Short Circuit Protection


Coordinating Overcurrent Protection in Complex Power Systems

Modern power systems are intricate networks that deliver electricity from generation sources to various consumers. These systems comprise multiple layers, including high voltage transmission lines, substations, distribution feeders, and low voltage connections to end users. Ensuring reliable...

Lightning Protection Systems


Generator Protection


Coordinating Protection for Generator Safety

The reliable operation of a power grid hinges on the proper functioning of its generators. Protecting these critical assets from internal faults and external disturbances is paramount. However, achieving this protection presents a complex challenge – ensuring fast fault clearing times to...

Electrical Protection

Protecting Industrial Control Circuits

Addressing relay challenges with the modern technology

BY MARK STEPHENS & ALDEN WRIGHT, Electric Power Research Institute

In 2009, the Electric Power Research Institute (EPRI) began an effort to create improved alternating current (AC) “ice cube” relays that could withstand voltage sags without dropping out.

Their white paper entitled “AC Ice Cube Relays Applied for Improved Power Quality” outlined the basic design and vulnerability of these common devices that often appear in modern industrial control...

Electrical Protection Articles