• Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy
Have any question?
[email protected]
RegisterLogin
StudyElectrical.Com
  • Home
  • Courses
  • Machines
    • Transformer
    • AC Motors
      • Induction Motor
      • Synchronous Motor
    • DC Motor
    • DC Generator
  • Power System
    • Circuit Breaker
    • Switchgear
    • Substation
    • Control System
    • Measurement
  • Electronics
  • Blog
  • Contact
    • Contact Us
    • Privacy Policy

Power System

Properties of Good Transformer Oil

  • Categories Power System, Substation, Transformer
properties 2Bof
properties 2Bof
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 oil are explained in this article.

Organic oils of vegetative or animal origin are good insulators but tend to decompose giving rise to acidic by-products which attack the paper or cloth insulation around the conductors.

Mineral oils are suitable from the point of electrical properties but tend to form sludge. The properties that are required to be looked into before selecting oil for transformer application are as follows:

Table of Contents

  • 1. Insulting property
  • 2. Viscosity
  • 3. Purity
  • 4. Sludge formation
  • 5. Acidity
  • 6. Flashpoint And Fire point
  • Related Articles

1. Insulting property

This is a very important property. However, most of the oils naturally fulfill this. Therefore deterioration in insulating property due to moisture or contamination may be more relevant.

2. Viscosity

It is important as it determines the rate of flow of the fluid. Highly viscous fluids need much bigger clearances for adequate heat removal.

3. Purity

The oil must not contain impurities which are corrosive. Sulfur or its compounds as impurities cause the formation of sludge and also attack metal parts.

4. Sludge formation

Thickening of oil into a semisolid form is called sludge. Sludge formation properties have to be considered while choosing the oil as the oil slowly forms semi-solid hydrocarbons.
 
These impede flows and due to the acidic nature, corrode metal parts. Heat in the presence of oxygen is seen to accelerate sludge formation. 
 
If the hot oil is prevented from coming into contact with atmospheric air sludge formation can be greatly reduced.

5. Acidity

Oxidized oil normally produces CO₂ and acids. The cellulose which is in the paper insulation contains a good amount of moisture. These form corrosive vapors. A good breather can reduce the problems due to the formation of acids.

6. Flashpoint And Fire point

Flashpoint of an oil is the temperature at which the oil ignites spontaneously. This must be as high as possible (not less than 160º C from the point of safety). 
 
Fire point is the temperature at which the oil flashes and continuously burns. This must be very high for the chosen oil (not less than 200º C).
 
Inhibited oils and synthetic oils are therefore used in the transformers. Inhibited oils contain additives which slow down the deterioration of properties under heat and moisture and hence the degradation of oil. 
 
Synthetic transformer oil like chlorinated diphenyl has excellent properties like chemical stability, non-oxidizing, good dielectric strength, moisture repellant, reduced risk due to fire and explosion.
 
It is, therefore, necessary to check the quality of the oil periodically and take corrective steps to avoid major breakdowns in the transformer.

Related Articles

  • all day efficiency of transformer
    All Day Efficiency of Transformer

    The ratio of output in kWh to the input in kWh of a transformer over…

  • ideal 2Btransformer 2Bphasor 2Bdiagram
    Ideal Transformer and Practical Transformer

    Ideal Transformer An ideal transformer is one that has no winding resistance no leakage flux…

  • Differences between Power Transformer and Distribution Transformer
    Power Transformer and Distribution Transformer

    The power transformer and distribution transformer are an important part of an electrical power distribution…

  • transformer oil testing
    Transformer Oil - Tests and Purification Methods

    What is Transformer Oil? Transformer oil is mineral insulating oil derived from crude petroleum. It…

  • Transformer Oil Filtration
    Transformer Oil Filtration and Hot Oil Circulation Process

    Transformer Oil Filtration Plant is a self-contained unit to upgrade the quantity of oil. The…

  • transformer oil testing
    Transformer Oil Testing : Video Training

    Transformer oil testing is just like a blood test in the human body. A blood…

  • Share:
author avatar
Electrical Engineer

Previous post

Percentage Impedance of Transformer and Its Calculation
May 30, 2018

Next post

Ideal Transformer and Practical Transformer
June 1, 2018

You may also like

percentage_reactance transformer
Percentage Reactance in Power System (Transformer, Generator or Reactor)
16 January, 2023
transformer-winding
Transformer Windings: Types and Design
22 November, 2022
Load Curve and Load Duration Curve
Load Duration Curve in Power Station
29 September, 2022

    2 Comments

  1. Alice Carroll
    May 2, 2020
    Reply

    Thanks for the tip that the fire point of my transformer oils should be less than 200 degrees. The new house I’m getting built is about to be finished so I’m starting to think about the electrical wiring that will be done to it soon enough. I will make sure to keep a close look at the kind of transformer that will be installed in my home.

    https://www.powersubservices.com/services/oil-sampling/

Leave A Reply Cancel reply

Your email address will not be published. Required fields are marked *

Search Here

From Blog

Types of Circuit Breakers
Different Types of Circuit Breakers
24May2014
hdl pcb
HDI PCB Boards: All you need to know
22May2022
types of ROM
Types of ROM | PROM, EPROM, EEPROM, Flash EPROM & Mask ROM
01Jun2017
How does tesla electric car work
Video : How Does a Tesla Electric Car Work?
12Feb2018

Categories

  • Alternator
  • Arduino
  • Basic Electrical
  • Battery
  • Books
  • Cables
  • Capacitor
  • Career
  • Circuit Breaker
  • Control System
  • DC Generator
  • DC Motor
  • Drives
  • Electric Vehicles
  • Electrical Circuits
  • Electrical Machines
  • Electrical Relays
  • Electrical Safety
  • Electronics
  • Embedded System
  • Exams
  • Generation
  • Guest Post
  • HVDC
  • Instrumentation
  • Interview Questions
  • Locomotives
  • Measurement
  • Microcontroller
  • Objective Questions
  • PCB
  • PLC
  • Power System
  • Problems and Solution
  • Projects
  • Resistor
  • Signals and Systems
  • Single Phase Motors
  • Substation
  • Switchgear
  • Synchronous Motor
  • Three Phase Induction Motor
  • Transformer
  • Transmission Line
  • Uncategorized

Copyright © 2021 Study Electrical, Inc.

© StudyElectrical.Com 2021

Login with your site account

Lost your password?

Not a member yet? Register now

Register a new account

Are you a member? Login now