This essay has been submitted by a student. This is not an example of the work written by professional essay writers.

Classification and Impact of Power Quality Problems

downloadDownload printPrint

Pssst… we can write an original essay just for you.

Any subject. Any type of essay. We’ll even meet a 3-hour deadline.

Get your price

121 writers online

Download PDF

We now will study the various types of disturbances occurring in power system with their magnitude and duration:

Complete interruptions: This is our country biggest problem when we study about power quality, the reasons are many. In the European standard EN 50160 two terms are used:

  • • Long interruptions: longer than three minutes.
  • • Short interruptions: up to three minutes.

Reasons for interruptions are: Power system faults(such as LG,LLG,LLL,LLLG), Equipments failure, Control system malfunctions, Delayed reclosing of the protective devices, Insulation failure of a permanent fault outcome of relay protections working, Environmental related damages, Difference between Generation and Load which leads to leading to load shedding and this happens because of overloading of lines or transformer. Frequent Local interruptions such as maintenance work of instruments, improvements in existing network etc. and this can take several hours. In such cases, the industries, household customers and utilities will face difficulties and losses. We have no proper mechanisms to inform our customers for such outages.

Flickering, spikes and surges i.e., Brownouts: It is a visible change in the brightness or intensity of the lamps due to fluctuations in the supply voltage. The main causes are equipments having continuous load variations such as large motors starting and static frequency converters etc. Other reasons include transformer on load tap changer, loose connections in the transformer bushings. Variations in generation’s capacity such as in case of wind turbines. Frequent tripping can also be included in this category. Effects of voltage fluctuations include unwanted tripping of relays and problems with sensitive equipments such in case of laboratories.

Low Voltage: The main reason for this is overloading. If the voltage doesn’t lie with the specified limits of the instrument then it may cause damage to sensitive equipments. Some of the voltage variations can be reduced by using voltage stabilizer, which ensures a constant output voltage.

High Voltage: High voltages are mainly caused due to large load changes and power lines switching. If voltage reaches too high value then it can damage electrical equipments. Causes of high voltages are transients, tap changers etc. Devices used to control high voltages in a system are surge protectors or surge arrestor.

Transformer Failure: This can be caused by many reasons such as deterioration of insulating oil, unbalanced loading, overloading etc. As transformer just transfers energy from one circuit to another so chances of its failure are very low. Usually a minimum of 10% of the distribution transformers will fail every year in any utility. The replacement of transformers usually takes a lot of time (depends on the size) and thus causing interruption to a larger area. The probability of failure of power transformers is very less as compared to that of distribution transformer.

Remember: This is just a sample from a fellow student.

Your time is important. Let us write you an essay from scratch

experts 450+ experts on 30 subjects ready to help you just now

delivery Starting from 3 hours delivery

Find Free Essays

We provide you with original essay samples, perfect formatting and styling

Cite this Essay

To export a reference to this article please select a referencing style below:

Classification and Impact of Power Quality Problems. (2019, May 14). GradesFixer. Retrieved November 28, 2021, from
“Classification and Impact of Power Quality Problems.” GradesFixer, 14 May 2019,
Classification and Impact of Power Quality Problems. [online]. Available at: <> [Accessed 28 Nov. 2021].
Classification and Impact of Power Quality Problems [Internet]. GradesFixer. 2019 May 14 [cited 2021 Nov 28]. Available from:
copy to clipboard

Sorry, copying is not allowed on our website. If you’d like this or any other sample, we’ll happily email it to you.

    By clicking “Send”, you agree to our Terms of service and Privacy statement. We will occasionally send you account related emails.


    Attention! This essay is not unique. You can get a 100% Plagiarism-FREE one in 30 sec

    Receive a 100% plagiarism-free essay on your email just for $4.99
    get unique paper
    *Public papers are open and may contain not unique content
    download public sample

    Sorry, we could not paraphrase this essay. Our professional writers can rewrite it and get you a unique paper.



    Please check your inbox.

    Want us to write one just for you? We can custom edit this essay into an original, 100% plagiarism free essay.

    thanks-icon Order now

    Hi there!

    Are you interested in getting a customized paper?

    Check it out!
    Having trouble finding the perfect essay? We’ve got you covered. Hire a writer

    Haven't found the right essay?

    Get an expert to write you the one you need!


    Professional writers and researchers


    Sources and citation are provided


    3 hour delivery