Electric Portal

Electric Portal is about electrical concepts and other electrical machines like motor transformer,dol starter,star delta starter,auto transformer starter and much more

DOL Starter: Working Principle Advantages and Application

Direct On-Line is the simplest and cheapest method used for starting a three-phase induction motor. DOL starter is used for up to 5 HP motors. this starter is more popular due to the low price. Different starting methods are used to start 3-phase induction motors like star delta starter, autotransformer starter, variable frequency drive, soft starter. DOL starter […]

Overload Relay-Working Principle and Construction

Overload relay is an important component in protecting motors from electrical overloads. By monitoring the current flow to motors, these devices prevent damage that could affect motor performance and longevity. This article explores the principles, their types, applications, and their benefits in maintaining motor health and efficiency. Working Principle of Overload Relay Overload relays operate […]

VFD-Working Principle and Block Diagram

VFD is a short form of a variable frequency drive also called Frequency converters, which has undergone extremely rapid changes, largely as a result of the development of microprocessor and semiconductor devices and their reduction in prices. However, the basic working principles of frequency converters remain the same. Other names of VFD are variable speed […]

What is Soft Starter,Working Principle,diagram,advantages

What is Soft Starter? Soft Starters are starting devices, used for the acceleration, deceleration, and protection of the three phase electrical induction motors through the controlling applied voltage to 3 phase motor.Induction motor is the most frequently used motor for industrial as well as domestic applications. Most industrial motors are single phase or three-phase induction motors depending upon the […]

Star Delta Starter-Working Principle, Control Diagram

A star delta starter is a type of motor starter that is used to control the starting and stopping of three-phase induction motors. It is commonly used in industrial applications where motors of large power ratings are used. In this blog post, we will explore the working principle, control diagram, construction, advantages, theory, and applications […]

Auto transformer-Working Diagram, advantages, disadvantages

Auto transformer is a transformer in which part of the winding is common to both the primary winding circuit and a secondary winding. In normal two winding transformers, primary and secondary winding are electrically isolated but in the case of an autotransformer, the two winding are connected electrically as well as magnetically. Auto transformer are also called […]

Transformer Oil Testing-Types, Methods Properties

Transformer oil testing is a crucial part of transformer maintenance, as the oil serves as electrical insulation between the winding and tank and acts as a cooling agent. Over time, the oil can become contaminated, which can degrade its insulating properties and reduce its ability to dissipate heat. Therefore, periodic transformer oil testing is essential […]