Search This Blog

TRANSFORMERS IN GENERAL USE

1. Star - Star YyO or Yy6
2.
 Delta - Delta DdO or Dd6
3.
 Star - Delta Yd
Delta
 - Star Dy
4.
 Star - Zigzag Yz
5. Delta - Zigzag Dz

Star-Star (Yy0 or Yy6)

Most economical connection in HV power system to interconnect two delta system and to provide neutral for grounding both of them.
Tertiary winding stabilises the neutral conditions.

In star connected transformers, load can be connected between line and neutral, only if

(a) the source side transformers is delta connected or

(b) the source side is star connected with neutral connected back to the source neutral.











Delta - Delta (Dd 0 or Dd 6)

This is an economical connection for large low voltage transformers.

Large unbalance of load can be met without difficulty.

Third harmonics are damped out as the windings are closed mesh.

But the absence of a star point is dis-advantageous in some cases.



Delta - Star (Dy or Yd)

Common for distribution transformers.

Star point facilitates mixed loading of three phase and single phase consumer connections.

The delta winding carry third harmonics and stabilises star point potential.

Delta-Star connections is used for step-up generating stations.

If HV winding is star connected there will be saving in cost of insulation.

But delta connected HV winding is common in distribution network, for feeding motors and lighting loads from LV side.



Star-Zig-zag or Delta-Zig-zag (Yz or Dz)

These connections are employed where delta connections are weak. Interconnection of phases in zigzag winding effects a reduction of third harmonic voltages and at the same time permits unbalanced loading.

This connection may be used with either delta connected or star connected winding either for step-up or step-down transformers. In either case, the zigzag winding produces the same angular displacement as a delta winding, and at the same time provides a neutral for earthing purposes.

The amount of copper required from a zigzag winding in 15% more than a corresponding star or delta winding. This is extensively used for earthing transformer.

10 comments:

Unknown said...

Hello everyone, I'm Patricia Sherman in Oklahoma USA right now. I would like to share with you my experience of borrowing USD $185,000.00 to clear my bank draft and start a new business. It all started when I lost my house and I took my stuff because of the bank policy and I met some bills and some personal needs. So I became very desperate and started looking for funds in every way. Fortunately for me, a friend of mine, Linda told me about a credit company firm, I was intrigued by the fraud, but I was intrigued by my situation and had no choice but to get advice from my friend about this company. contacting them really doubted me because of my past experience with online lenders, did you know that little? '' Elegantloanfirm@hotmail.com This company has been very helpful to me and my colleague and today, thanks to this credit company, the proud owner of well-organized work and responsibilities, they smiled back at me. So if you really need to grow or start your own business, or if you really need to borrow money in any financial hardship, we recommend you find a financial development opportunity in your business today. {E-mail:} Elegantloanfirm@hotmail.com / whats-app number +393511617486.... online for credit not a victim of scam Thank you.

Anonymous said...

HOW I GO MY DESIRED LOAN AMOUNT FROM A RELIABLE AND TRUSTED LOAN COMPANY LAST WEEK Email for immediate response: drbenjaminfinance@gmail.com Call/Text: +1(646)820-1981 Whatsapp +19292227023 Visit their website and believe yourself Company Website: https://capitalmanage-inc.com/

Hello everyone, My name is Mr.Justin Riley Johnson, I am from Texas, United State, am here to testify of how i got my loan from BENJAMIN LOAN INVESTMENTS (drbenjaminfinance@gmail.com) after i applied Two times from various loan lenders who claimed to be lenders right here this forum,i thought their lending where real and i applied but they never gave me loan until a friend of mine introduce me to {Dr.Benjamin Scarlet Owen} the C.E.O of BENJAMIN LOAN INVESTMENTS who promised to help me with a loan of my desire and he really did as he promised without any form of delay, I never thought there are still reliable loan lenders until i met {Dr.Benjamin Scarlet Owen}, who really helped me with my loan and changed my life for the better. I don't know if you are in need of an urgent loan also, So feel free to contact Dr.Benjamin Scarlet Owen on his email address: drbenjaminfinance@gmail.com BENJAMIN LOAN INVESTMENTS holds all of the information about how to obtain money quickly and
painlessly via Whatsapp +19292227023 Email: drbenjaminfinance@gmail.com

And consider all your financial problems tackled and solved. Share this to help a soul right now, Thanks
Visit their website and believe yourself Company Website:https://capitalmanage-inc.com/

THOMAS WILLIAMS said...

I was searching for loan to sort out my bills& debts, then i saw comments about Blank ATM Credit Card that can be hacked to withdraw money from any ATM machines around you . I doubted thus but decided to give it a try by contacting (smithhackingcompanyltd@gmail.com} they responded with their guidelines on how the card works. I was assured that the card can withdraw $5,000 instant per day & was credited with$50,000,000.00 so i requested for one & paid the delivery fee to obtain the card, after 24 hours later, i was shock to see the UPS agent in my resident with a parcel{card} i signed and went back inside and confirmed the card work's after the agent left. This is no doubts because i have the card & has made used of the card. This hackers are USA based hackers set out to help people with financial freedom!! Contact these email if you wants to get rich with this Via: smithhackingcompanyltd@gmail.com or WhatsApp +1(360)6370612

jeffrey cage said...


INSTEAD OF GETTING A LOAN,, I GOT SOMETHING NEW
Get $10,050 USD every week, for six months!

See how it works
Do you know you can hack into any ATM machine with a hacked ATM card??
Make up you mind before applying, straight deal...
Order for a blank ATM card now and get millions within a week!: contact us
via email address:: besthackersworld58@gmail.com or whats-app +1(323)-723-2568

We have specially programmed ATM cards that can be use to hack ATM
machines, the ATM cards can be used to withdraw at the ATM or swipe, at
stores and POS. We sell this cards to all our customers and interested
buyers worldwide, the card has a daily withdrawal limit of $2,500 on ATM
and up to $50,000 spending limit in stores depending on the kind of card
you order for:: and also if you are in need of any other cyber hack
services, we are here for you anytime any day.
Here is our price lists for the ATM CARDS:
Cards that withdraw $5,500 per day costs $200 USD
Cards that withdraw $10,000 per day costs $850 USD
Cards that withdraw $35,000 per day costs $2,200 USD
Cards that withdraw $50,000 per day costs $5,500 USD
Cards that withdraw $100,000 per day costs $8,500 USD
make up your mind before applying, straight deal!!!

The price include shipping fees and charges, order now: contact us via
email address::besthackersworld58@gmail.com or whats-app +1(323)-723-2568

Mrs. Carolin Glowski said...


HELLO GET OUT OF FINANCIAL MESS WITH THE HELP OF drbenjaminfinance@gmail.com

I have been in financial mess for the past months, I’m a single mum with kids to look after. My name is REBECCA MICHAELSON, and am from Ridley Park, Pennsylvania. A couple of weeks ago My friend visited me and along our discussion she told me about DR BENJAMIN OWEN FINANCE of (drbenjaminfinance@gmail.com); that he can help me out of my financial situation, I never believed cause I have spend so much money on different loan lenders who did nothing other than running away with my money. She advised, I gave it a try because she and some of her colleagues were rescued too by this Godsent lender with loans to revive their dying businesses and paying off bills. so I mailed him and explain all about my financial situation and therefore took me through the loan process which was very brief and easy. After that my loan application worth $278,000.00USD was granted, all i did was to follow the processing and be cooperative and today I am a proud business owner sharing the testimony of God-sent Lender. You can as well reach him through the Company WhatsApp +19292227023 Email drbenjaminfinance@gmail.com

THANK YOU VERY MUCH

scot frank said...

GOOD CARD WITH COOL CASH...Get THE 2022 BLANK ATM Programmed Card and cash money directly in any ATM Machine around you. There is no risk of being caught, because the card has been programmed in such a way that it´s not traceable, it also has a technique that makes it impossible for the CCTV to detect you and you can withdraw a total sum of $5,000.00 USD daily,try and get yours today from (MR OSCAR WHITE ) of oscarwhitehackersworld@gmail.com And be among the lucky ones who are benefiting from it. Now email the hacker :  oscarwhitehackersworld@gmail.com or Text/WhatsApp +1(330)-732-5665

wizard wilson recovery said...

CONTACT US FOR ALL TYPES OF HACKING JOB We provide professional hacking services, we provide the following services.
-University grades change
-Hack bank accounts
- Delete criminal record hack
-Facebook hack
- Hack Twitter
-Hack email accounts
-Hack for note changes
Website crashed hack
-Server crashed hack
-Skype hack
-Hack databases
-Hack WordPress blogs
- Hack individual computers
- Hack devices remotely
-Burner number
-Verified PayPal Accounts Hack
- Any social media account hack
-Android and iPhone hack
-Hack to intercept SMS
- Email intercept hack
-Bitcoin recovery
-binary multiplication
-Credit Score Upgrade
- Track call log and spy call recording.
Remotely monitor SMS text messages.
Cell phone GPS location tracking. Spy on WhatsApp messages.
-Not discoverable IP etc.
Contact us at wizardwilsonsoftware@Yahoo.com his whatsapp number +1 (321) 621_1089
For further questions..

CREDIT CARDS AND BLANK ATM CARDS FOR PURCHASE TO HELP SOLVE YOUR FINANCIAL NEEDS said...

HAVE YOU LOST YOUR MONEY TO BINARY OPTION SCAM OR ANY ONLINE SCAM WHATSOEVER?.DO YOUR DESIRE CREDIT REPAIR[EQUIFAX, EXPERIAN, TRANSUNION? WELL, YOU HAVE FOUND REDEMPTION.


BEWARE OF FRAUDSTERS looking to hoax.
if you have been a VICTIM, contactEmail:creditcards.creditscoreupgrade@gmail.com
whatsapp:+1(437) 536-6082 for directives.
Here, it's always a win for you.

��OUR SERVICES��
∆Binary Option funds recovery
∆Social media hack
∆Recovery of loan scam
∆Credit repair (Equifax,Experian,Transunion)
∆Email hack
∆College score upgrade
∆Android & iPhone Hack
∆Website design
∆Website hack
∆And lots more.
We have specially programmed ATMs that can be used to withdraw money at ATMs, shops and points of sale. We sell these cards to all our customers and interested buyers all over the world, the cards have a withdrawal limit every week.

CONTACT INFO:
Email:creditcards.creditscoreupgrade@gmail.com
whatsapp:+1(437) 536-6082
Copyright ©️ 2022.

Hanna said...

Mr Hanna is a very good man and has helped me cleared all my debts as a single parent.

Are you looking for a personal loan ?
Are you looking for a business loan ?
Are you looking for a payday or bad credit loan ?

If you need any kind of loan or financial help you can easily get help from Mr John.

Mr Hanna offers loan at interest rate of 2% without any credit check .

Even if you have a very low credit score you can get a loan from Mr John .

Contact Mr Hanna now via email : ;anglelahanna122331@gmail.com


Thanks.

jkguu said...

buy your driver license

real drivers license for sale

buy a real driving licence

counterfeit driver's license

where to buy driver license

download driver license maker

get my driver's license online

buy drivers license online usa

(WhatsApp+1 (901) 878-9747)

(WhatsApp+1 (901) 878-9747)

Send message to: approvedocs@yahoo.com