## Limiting Error and Relative Limiting Error

Limiting Error is defined as the maximum deviation either in positive side or negative side in the measurement by an instrument from the nominal value or true value. Let us assume that the true value or nominal value of a quantity is As and the...

## Copper to Aluminium Electrical Joints – Why Important?

Being an Electrical Engineer we may often face situations where copper and aluminium electrical joints are required. Such joints are required in various scenario. For example, in Switchyard the material of buses are of Aluminium whereas that of P1 &P2 connector of CTs are of...

## Galvanic Corrosion – Cause, Effect and Prevention

Galvanic Corrosion is a process of corrosion when two different metals are brought in electrical contact and the contact is bridged by a conductive fluid such as sea water, salted water etc. This is also known as Bimetallic Corrosion or dissimilar metal corrosion. How Galvanic...

## Calculation of Resonating Inductor for Tan Delta Test Kit?

What is Resonating Inductor? A Resonating Inductor is nothing special but it is just an Inductor having a specified value of Inductance. Resonating word is added here just to give idea of its purpose and working principle. Now you can guess. Obviously this inductor will...

## Geometrical Mean Radius (GMR) and Inductance

Geometrical Mean Radius GMR is basically the Geometric Mean of distances between the strands of a conductor. It is the fictitious radius of conductor having no internal flux linkage but only external flux linkage. To understand the concept of GMR and its calculation, it is...

## Inductance of Single Conductor of Transmission Line

Inductance is the property of a conductor due to which it opposes a sudden change in current through it and a basic electrical parameter like resistance and capacitance. Inductance is defined as the total flux linkage per unit current. To analyse the electrical behavior of...

## Ring Main Unit (RMU) – Introduction

Ring Main Unit,RMU is a compact, enclosed and sealed type of Switchgear used for medium voltage power distribution. It is a complete Switchgear in itself. A complete Switchgear means, assembly of required switching devices, protection device as well as metering device. RMU of different voltage...

## How to Disable Full DR Alarm in Numerical Relay?

These days mostly Numerical Relays are used for protection purpose instead of conventional Electromechanical Relays. In fact, Numerical Relays offer a variety of protection as well as trouble shooting features. A single Numerical Relay can provide many protection unlike conventional Electromechanical Relays. A single Numerical...