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Category 'Protection' - Technical Articles

“Protection” category refers to technical articles dedicated to relay protection of various power substation and transmission & distribution equipment, such as low- medium- and high-voltage switchgear, transformers, capacitor banks, cables, transmission lines, electric motors and generators, and so on. Great attention is paid on circuit breaker schematics, such as tripping, closing and blocking coil arrangements, etc.

Power Substation

Interlocking for 380kV GIS Substation: One-and-a-half breaker scheme analysis

This article delves into various aspects of the one-and-a-half breaker scheme applied to 380kV GIS switchgear, starting with its benefits and operational framework. It further examines the critical interlocking concepts, including open and closed positions, the “under operation” state (dangerous…...

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Jan 13, 2025 | By

Interlocking for 380kV GIS Substation: One-and-a-half breaker scheme analysis
Power Substation

What is Interlocking in substations, and what is it for?

Interlocking in substations is a critical aspect of power system protection and control, designed to ensure the safe and efficient operation of substation equipment. The primary objective of interlocking is to prevent hazardous situations, such as energizing an earthed circuit…...

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Dec 16, 2024 | By

What is Interlocking in substations, and what is it for?
Energy and Power

Voltage transformer selection scheme in complex substations

In substations, voltage transformers (VTs) are used extensively for energy metering, protection relay operations, and synchronization checks. Their design includes multiple cores, each dedicated to specific functions. For instance, a protection core, typically labeled 3P, offers acceptable accuracy for fault…...

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Dec 02, 2024 | By

Voltage transformer selection scheme in complex substations
Power Substation

Synchro Check Schemes: Key Techniques and Considerations for Power System Stability

In power systems, synchronization is a fundamental requirement for connecting two sources of electric power, such as a generator to a grid or between segments of the power network. Ensuring that these sources are aligned in frequency, phase sequence, and…...

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Nov 18, 2024 | By

Synchro Check Schemes: Key Techniques and Considerations for Power System Stability
Power Substation

Best Practices in Synchronization and Reactive Power Control in Power System

In the world of power systems, synchronization and reactive power control are crucial to maintaining stability, efficiency, and reliability. Synchronizing various power sources, such as generators and grids, ensures they operate in harmony to meet the demand and support the…...

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Nov 11, 2024 | By

Best Practices in Synchronization and Reactive Power Control in Power System
Power Substation

What is a Load Tap Changer (LTC)?

We all experienced the ocasional flickering of the house lights during evenings. This usually indicates a load tap changer (LTC) adjustment, or a sign that the bulb is about to drop dead, but that’s not the subject of this article… Read more

Nov 04, 2024 | By

What is a Load Tap Changer (LTC)?
Premium Content

Electrical thumb rules for switching, isolating and earthing

It is essential that the electrical engineers, or operators who will be in charge of switching, isolating, and earthing operations of the switchgear have a good understanding of the rules that must be followed. In addition, it is of the…...

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Oct 21, 2024 | By

Electrical thumb rules for switching, isolating and earthing
Electric Motor

Star-delta starting used with large horsepower motors

Star-delta starting is frequently employed with high horsepower motors to mitigate inrush current during the start-up stage and to reduce starting torque. Star-delta starting involves initially connecting the motor stator windings in a star configuration during the motor startup phase,… Read more

Oct 16, 2024 | By

Wye-delta starting used with large horsepower motors
Premium Content

So automated, yet so hackable. Is your country’s power grid safe from cyberattacks?

Yes, many of today’s power grids are very sophisticated and automated. Every single event and piece of equipment is tracked, controlled, measured, and protected. But things aren’t as bright as it seems. As we can see, it turns out that…...

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Oct 14, 2024 | By

So automated, yet so hackable. Is your country's power grid safe from cyberattacks?
Power Substation

Mastering Distance Protection and Calculations: Never Mess Up Protection Accuracy

The first part of this article series delved into the fundamentals of overcurrent protection, exploring the intricacies of relay coordination, the impact of source impedance, and the application of distance protection. These foundational concepts laid the groundwork for understanding how…...

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Sep 23, 2024 | By

Mastering Distance Protection and Calculations Part 2: Arc Resistance, Impedances and CTs/VTs
Power Substation

Mastering Distance Protection and Calculations: Advice and Serious Warnings

In 2004, I embarked on an intensive nine-month training program in protection and instrumentation. This experience laid the foundation for my deep understanding of substation protection systems, combining both theoretical knowledge and practical application. The first protection scheme we delved…...

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Sep 09, 2024 | By

Mastering Distance Protection and Calculations Part 1: Advice and Serious Warnings


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