Transformer
A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to one or more circuits. A varying current in any one coil of the transformer produces a varying magnetic flux, which, in turn, induces a varying electromotive force across any other coils wound around the same core.
Why Transformers are Rated in kVA, Not in kW?
Parallel Operation of Single Phase Transformers
Transformer Basics
Why Transformers are Rated in kVA
Transformer on DC Supply
Voltage and Frequency Effects
Types of Transformer
Power and Distribution Transformers
Core Type and Shell Type Transformer
Losses in a Transformer
Voltage and Frequency Effects
Three Phase Transformer
Three Phase Transformer Connection
Parallel Operation of 1 Phase Transformer
CT – Windings and Insulation Level
Transformer Bushings
Current Transformers
Types of Current Transformers
Transformer Oil
Transformer Oil Tests
Transformer Oil Filtration
Condition Monitoring of Transformers
Transformer Testing
Testing of Transformers
Power Transformers – Testing Methods
Transformer Efficiency
Power and Distribution Transformers
Methods of Cooling
Test
Three Phase Transformer Interconnections
Three-Phase Transformer – Basics and Connection Methods
Ideal Transformer and Practical Transformer
Insulation Resistance Test (IR Test) or Megger Test
Corona Effect in Power System
Working Principle of Transformer
A transformer is a static piece of equipment used either for raising or lowering the voltage of an AC supply with a corresponding decrease or increase in current. It essentially
Why Transformers are Rated in kVA, Not in kW?
Transformer rating is expressed in kVA, not in kW. Rating of a transformer or any other electrical machine reflects its load carrying capability without overheating. Temperature rise (a major threat to insulation) arises due
Why Transformer does not work on DC supply?
Did you ever think about what will happen to a transformer on dc supply? In this article, you will learn why the transformer does not work on the DC supply.
Why Current Transformer (CT) Seconday Should not be Open ?
Amazed why secondary of current transformer should not be open? If it is left open it may destroy the current transformer. So it is very important that the secondary of
What are Protective Relays? | Types and Working
What is a Protective Relay? The protective relay was invented more than 160 years ago. During the last 60 years, it has undergone considerable change, the most obvious of which
Video: How Single Phase and Three Phase Transformer Works?
In today’s post, we will go through a video that explains the working of single phase and three phase transformers in detail. We have already discussed the working principle of a transformer and Why Transformers are Rated in kVA, Not in kW? Watch the video below..
Transformer Oil Testing : Video Training
Transformer oil testing is just like a blood test in the human body. A blood test provides a doctor with a wealth of information about the health of a patient.
Transformer Oil Filtration and Hot Oil Circulation Process
Transformer Oil Filtration Plant is a self-contained unit to upgrade the quantity of oil. The duty cycle begins from pumping the dirty oil from the equipment (or container) to a
Transformer Oil – Tests and Purification Methods
What is Transformer Oil? Transformer oil is mineral insulating oil derived from crude petroleum. It is a mixture of various hydrocarbons. It consists partly aliphatic compounds (open chain compounds) with
Transformer Bushing Types : RIP Bushing vs OIP Bushing
Transformer bushing types are categorized based on their material, manufacturing, and design mainly into the following types: OIP (Oil-Impregnated Paper) Bushing RIP (Resin Impregnated Paper) Bushing RIS (Resin Impregnated Synthetic)
Three-Phase Transformer – Basics and Connection Methods
Three-phase transformers are used in three-phase circuits to step up and step down the voltage according to the needs in a power system. You know that electric power is generated
Three Phase Transformer Interconnections
The phase windings of three-phase transformers are interconnected to give a three-phase, three-or four-wire supply through three different modes of connection. They are mesh or delta connection star connection zigzag connection
Substation Earthing System Design
We have already given an introduction to substation earthing system in an article published earlier. Today we are going to discuss the design of substation earthing system. Before 1960s the
Substation Earthing System ( Grounding System ) – Earthing Mat
The substation earthing system comprises of a grid (earth mat) formed by a horizontal buried conductors. Read about design of substation earthing system here. The grounding system in substation is very
Star-Star (Y-Y) Connection of Three Phase Transformers
There are different types of connection employed for three-phase transformers. The star-star (Y-Y) connection of three-phase transformers is the most economical type of connection for small current and high voltage transformers. The
Rectifier Transformer – Working Principle and Application
What is the Rectifier Transformer? Rectifier transformers are different from normal power and distribution transformers because they are special transformers made for industrial application. A Rectifier transformer is a special application
Properties of Good Transformer Oil
Even though the basic functions of the oil used in transformers are heat conduction and electrical insulation, there are many other properties which make a particular oil eminently suitable. Properties of good transformer
Primary and Back-up Protection in Power System
Primary and Back-up Protection Primary protection (Main protection) is the essential protection provided for protecting an equivalent/machine or a part of the power system. As a precautionary measure, addition protection
Practical Transformer on No Load
Please read Ideal Transformer and Practical Transformer before continuing. Consider a practical transformer on no load i.e., secondary on open-circuit as shown in figure below. The primary will draw a small
Power Transformer Testing Methods – Type, Routine & Special Tests
An electrical power transformer has to go through a number of transformer testing procedures for confirming its specifications and performances. In this article, you will learn different types of transformer
Power Transformer and Distribution Transformer
The power transformer and distribution transformer are an important part of an electrical power distribution network. They are classified based on some of their characteristics. A power transformer is used
Percentage Impedance of Transformer and Its Calculation
What is the Percentage Impedance? The percentage impedance of a transformer is marked on most nameplates – but what is it and what does the Z% figure mean? The
Parallel Operation of Single Phase Transformers
By parallel operation of single-phase transformers, we mean two or more transformers are connected to the same supply bus bars on the primary side and to a common bus bar/load on
Open Delta (V-V) Connection of Transformers
Open Delta Connection is a method of transformer connection used to transform three-phase power using two single-phase transformers. In this article, you will learn how this connection is done and
Load Forecasting – Purpose, Classification and Procedure
What is Load Forecasting? Electrical energy cannot currently be stored in large amounts. It has to be generated whenever there is a demand for it. It is, therefore, imperative for
Introduction to Gas Insulated Substations / Switchgears (GIS)
Gas-insulated substations (GIS) have been used in power systems over the last three decades because of their high reliability, easy maintenance, small ground space requirement, etc. This article is an
Insulation Resistance Test (IR Test) or Megger Test
Insulation Resistance or IR Test is carried out by maintenance engineers to ensure the healthiness of the overall insulation system of electrical equipment. It reflects the presence or absence of
Ideal Transformer and Practical Transformer
Ideal Transformer An ideal transformer is one that has no winding resistance no leakage flux i.e., the same flux links both the windings no iron losses (i.e., eddy current and
How to Test Percentage Impedance of Transformer?
This article covers transformer impedance testing, one of the acceptances tests for new transformers, and a method for routine testing. The results of this test should compare directly to the
Electrical Substation: Equipment, Types, Components & Functions
An electrical substation is an integral part of a generation, transmission and distribution system. A substation can interrupt or establish electrical circuit, change the voltage, frequency or other characteristics of