Electrical Substation

This guide gives you a complete, field-tested procedure for 7SA612 Distance Relay testing—from pre-commissioning visual checks through final zone verification—with the exact steps, settings, and acceptance criteria you need on...

An End to End (E2E) test is a synchronized functional verification of line protection schemes — primarily differential protection (87L) and distance protection (21) — between two substations. To achieve...

In this technical article, we will walk you through everything you need to know about testing overcurrent (50/51) and earth fault (51N) relays, including pickup and drop-off checks, timing tests,...

PLC is a technology that transmits communication signals—protection commands, voice, data, and telemetry—over the same high-voltage conductors already carrying AC power.

Old substations required workers to physically walk around, check meters, and manually operate switches. This was time-consuming, risky, and mistakes could happen. Modern SAS solves these problems by: Making Operations...

The goal of maintenance preventive maintenance is to keep the equipments in good working order at minimal cost. Decision makers have 2 basic options with respect to maintenance. They are:...

The HVDC LCC Classic system works in a special way that makes it different from newer systems. While modern Voltage Source Converter (VSC) systems change the direction of electric current...

A bus bar differential relay is a protective device that acts like a security guard for electrical substations. It constantly watches the electrical current flowing in and out of the...

Overcurrent Relay Setting Calculation 1. Pickup Current Setting Time Overcurrent relay using definite Characteristics For example: CT Ratio: 800/1A Rated Voltage: 132kV For Phase element Plug Setting: Considering maximum current...