UrbanPro
Login Ask & Answer Success Stories Paid Courses Free Classes Tuition & Classes Fees Write a Review All Categories Help Center
Post your Learning Need Signup as a Tutor
✕

Popular Cities

Bangalore

Hyderabad

Delhi

Mumbai

Chennai

Pune

Kolkata

Gurgaon

Ahmedabad

Jaipur

Noida

✕

Take Class 10 Tuition from the Best Tutors

  • Affordable fees
  • 1-1 or Group class
  • Flexible Timings
  • Verified Tutors

Book a Free Demo

Class 10 > Learn Class IX-X Tuition > why does high tension wires produce humming sound ?
✕

Search in

why does high tension wires produce humming sound ?

Asked by Last Modified  

4 Answers

Learn Class IX-X Tuition

Follow 0
Answer

Please enter your answer

The audible noise emitted from high-voltage lines is caused by the discharge of energy that occurs when the electrical field strength on the conductor surface is greater than the 'breakdown strength' (the field intensity necessary to start a flow of electric current) of the air surrounding the conductor....
read more
The audible noise emitted from high-voltage lines is caused by the discharge of energy that occurs when the electrical field strength on the conductor surface is greater than the 'breakdown strength' (the field intensity necessary to start a flow of electric current) of the air surrounding the conductor. This discharge is also responsible for radio noise, a visible glow of light near the conductor, an energy loss known as corona loss and other phenomena associated with high-voltage lines. "The degree or intensity of the corona discharge and the resulting audible noise are affected by the condition of the air--that is, by humidity, air density, wind and water in the form of rain, drizzle and fog. Water increases the conductivity of the air and so increases the intensity of the discharge. Also, irregularities on the conductor surface, such as nicks or sharp points and airborne contaminants, can increase the corona activity. Aging or weathering of the conductor surface generally reduces the significance of these factors. "The higher voltages at which modern transmission lines operate have increased the noise problem to the point to which they have become a concern to the power industry. Consequently, these lines are now designed, constructed and maintained so that during dry conditions they will operate below the corona-inception voltage, meaning that the line will generate a minimum of corona-related noise. In foul weather conditions, however, corona discharges can be produced by water droplets, fog and snow." read less
Comments
Dislike Bookmark

Two reasons: One is coronal discharge. The high voltage between adjacent wires (phases) is enough to make air conduct. As the voltage between phases is alternating, and constantly changing, the sound changes. Second reason: Current through the wire isn't fixed. The varying current causes expansion...
read more
Two reasons: One is coronal discharge. The high voltage between adjacent wires (phases) is enough to make air conduct. As the voltage between phases is alternating, and constantly changing, the sound changes. Second reason: Current through the wire isn't fixed. The varying current causes expansion and contraction of the wire, producing sound. Especially of concern is power factor far from 1, with current much higher at the peaks. Most electrical transmission is done three phase. So at 120 Hz and 120 degrees apart, each wire will expand slightly, creating a click, and the effective frequency might be as high as 480 Hz, explaining why it might sound higher in pitch. read less
Comments
Dislike Bookmark

Perl Developer | Perl Trainer

The reason for this is something known as "magnetostriction", which is strain induced in a magnetic lattice due to the magnetic nature of a material. There is a pretty good explanation of the buzzing noises in transformers here, but the summary is that the ferromagnetic domains in the transformer core...
read more
The reason for this is something known as "magnetostriction", which is strain induced in a magnetic lattice due to the magnetic nature of a material. There is a pretty good explanation of the buzzing noises in transformers here, but the summary is that the ferromagnetic domains in the transformer core are subjected to the 60Hz (in the US) oscillations of the magnetic field due to the AC current. Because of the electrical cycle, there are two impacts on the core per AC oscillation, so the strain is changing at 60 Hz, which produces the 120 Hz noise that we can identify a "great B" note. read less
Comments
Dislike Bookmark

"The audible noise emitted from high-voltage lines is caused by the discharge of energy that occurs when the electrical field strength on the conductor surface is greater than the 'breakdown strength' (the field intensity necessary to start a flow of electric current) of the air surrounding the conductor....
read more
"The audible noise emitted from high-voltage lines is caused by the discharge of energy that occurs when the electrical field strength on the conductor surface is greater than the 'breakdown strength' (the field intensity necessary to start a flow of electric current) of the air surrounding the conductor. This discharge is also responsible for radio noise, a visible glow of light near the conductor, an energy loss known as corona loss and other phenomena associated with high-voltage lines. read less
Comments
Dislike Bookmark

View 2 more Answers

Related Questions

What is the difference between IGCSE and CBSE ?
CBSE is Central Board of Secondary Education whereas IGCSE is International General Certificate of Secondary Education. Students from any Boards can join IGCSE Board in the 9th grade whereas aspirants...
Oscar Sivale
What steps can be taken to control soil erosion in the hilly areas?
Soil erosion is a potential threat to the areas that are lying on the steep slopes and also near the hills, where there is a good amount of crop cultivation. It not only leaves the land baren but also...
Trupti
0 0
5
Explain giving four reasons how tourism as an industry has alright future in India.
Tourism has a bright future in India because (i) India has many historical places and beautiful landscapes that tourists like to visit. (ii) A stable political climate like in India triggers more Foreign...
Rituraj
What is the difference between Mean and Median?
"Mean" is just an average which you can calculate by adding all the numbers or observation and divide it by the number of numbers or observation and "Median" is the mid value which is given in the list of numbers or observations.
Thejas
0 0
7
Define COPRA?
consumer protection act
Dr.
0 0
8

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

How to multiply 346 by 17 in 2 secs
Start with the right-most digit, 6. Multiply 7 with 6 and add the neighbor (none in this case, as 6 is the right-most digit). We get 42. Write down 2, and carry the 4. -----> 2 Move left to the next...

Debraj Paul

4 0
0
A Look at the State of Connected Devices in 2017
The connected devices trend is one that seems to be growing at a faster rate each year. This calendar year will be no different, as more and more companies continue to get involved. But where exactly do...

Rajesh N V

2 0
1
Polymerase Chain Reaction
The polymerase chain reaction (PCR) was originally developed in 1983 by the American biochemist Kary Mullis. PCR is used in molecular biology to make many copies of (amplify) small sections of DNA. Using...

Nikita M.

1 0
0
Fast Calculations In Mathematics: (Multiplication Module 1: Part a - Multiplication By 11)
Multiplication Of Any Two-Digit Number (Let Say Ab) By 11: A) WHEN (A+B) IS BETWEEN 0 TO 9: A (A+B) B EXAMPLES: 1) 11 X 42 = 4 ( 4+ 2) 2 = 462 ...

Anshuman Singh

1 0
0
Indices of Numbers
Squares and Cubes from Numbers 1 to 100: NUMBER SQUARE CUBE X X2 X3 1 1 1 2 4 8 3 9 27 4 16 64 5 25 125 6 36 216 7 49 343 8 64 512 9 81 729 10 100 1000 11 121 1331 12 144 1728 13 169 2197 14 196 2744 15 225 3375 16 256 4096 17 289 4913 18 324 5832 19 361 6859 20 400 8000 21 441 9261 22 484 10648 23 529 12167 24 576 13824 25 625 15625 26 676 17576 27 729 19683 28 784 21952 29 841 24389 30 900 27000 31 961 29791 32 1024 32768 33 1089 35937 34 1156 39304 35 1225 42875 36 1296 46656 37 1369 50653 38 1444 54872 39 1521 59319 40 1600 64000 41 1681 68921 42 1764 74088 43 1849 79507 44 1936 85184 45 2025 91125 46 2116 97336 47 2209 103823 48 2304 110592 49 2401 117649 50 2500 125000 51 2601 132651 52 2704 140608 53 2809 148877 54 2916 157464 55 3025 166375 56 3136 175616 57 3249 185193 58 3364 195112 59 3481 205379 60 3600 216000 61 3721 226981 62 3844 238328 63 3969 250047 64 4096 262144 65 4225 274625 66 4356 287496 67 4489 300763 68

Rahul G.

0 0
0

Recommended Articles

Meet Sandhya R, a B.Sc tutor from Bangalore

Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...

Read full article >

Quest Academy - Institute of the month

Quest Academy is a professional Bangalore based NEET and JEE (Main + Advanced) training institute. The academy was incorporated in 2015 to cater to the needs of students, who aim to crack competitive exams by connecting with the best brains around. The institute helps students enhance their skills and capabilities through...

Read full article >

Meet Mohammad Wazid, a skilled trainer for...

Mohammad Wazid is a certified professional tutor for class 11 students. He has 6 years of teaching experience which he couples with an energetic attitude and a vision of making any subject easy for the students. Over the years he has developed skills with a capability of understanding the requirements of the students. This...

Read full article >

Meet Swati, a Hindi Tutor from Bangalore

Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...

Read full article >

Find Class 10 Tuition near you
Class 10 Tuition in Delhi
Class 10 Tuition in Bangalore
Class 10 Tuition in Hyderabad
Class 10 Tuition in Kolkata
Class 10 Tuition in Mumbai
Class 10 Tuition in Chennai
Class 10 Tuition in Pune
Class 10 Tuition in Noida
Class 10 Tuition in Lucknow
Class 10 Tuition in Jaipur
Online Tuition Class 10

Looking for Class 10 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you
X

Looking for Class 10 Tuition Classes?

The best tutors for Class 10 Tuition Classes are on UrbanPro

  • Select the best Tutor
  • Book & Attend a Free Demo
  • Pay and start Learning

Take Class 10 Tuition with the Best Tutors

The best Tutors for Class 10 Tuition Classes are on UrbanPro

This website uses cookies

We use cookies to improve user experience. Choose what cookies you allow us to use. You can read more about our Cookie Policy in our Privacy Policy

Accept All
Decline All

UrbanPro.com is India's largest network of most trusted tutors and institutes. Over 55 lakh students rely on UrbanPro.com, to fulfill their learning requirements across 1,000+ categories. Using UrbanPro.com, parents, and students can compare multiple Tutors and Institutes and choose the one that best suits their requirements. More than 7.5 lakh verified Tutors and Institutes are helping millions of students every day and growing their tutoring business on UrbanPro.com. Whether you are looking for a tutor to learn mathematics, a German language trainer to brush up your German language skills or an institute to upgrade your IT skills, we have got the best selection of Tutors and Training Institutes for you. Read more

ThinkVidya Learning Pvt Ltd © 2010-2024All Rights Reserved