Answer / kc

An open delta is 2 transformers connected in delta. It is
used to get three phase power using 2 transformers.
A broken delta is 3 transformers connected in delta, but
not closing the delta. The voltage across the open corner
of the delta is used for voltage polarizing or ground
detection.

Answer / engineer tanweer hussain

in delta delta connection no difficulty faced against 3rd harmonic because path for circulating current is avoidable. Operating advantage in delta delta is that when one unit is removed from service the remaining can be operated in open open delta at reduced loading of 57% and not 2/3 of full capacity .
Proof.
Power in V/power in closed delta = (3)1/3 Vph Iph/3Vph Ih
= 1/1.732*100= 57.7%

Answer / sanjeet swarnakar

in open delta between there is no follow of current


But in broken delta 57 % load current folow between two
phases ...............

Answer / dayal varma

broken have some continuty open doesn't have any continuity

Answer / maqbool

There is no difference

how can we measure 220kv or more than these voltages ...?and also how can we conform whether we r getting 220kv from generating stations throuth the h v transmission lines?

1 Answers  

why we did not get shock by touching +ve OR -ve busbar (Which are going to supply cell voltage) of Rectifier- Tranformer in electrolysis plant?

4 Answers  

What is the name of the winding from which the supply is taken for load connections?

0 Answers  

derive DC RMS value for half wave rectifier?

0 Answers   BARC,

Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?

3 Answers   KSEB,

WHAT IS RMU & HOW IT WORK,IT USEFUL FOR HT OT LT POWER DISTRIBUTION MAUFACTUERE IN INDIA.

2 Answers  

how to deside the capacity of chock for drive?

0 Answers   Essar,

Q) Write VBscript code along with QTPscript code in QTP tool for below scenario 1. Launch yahoo site(i know) 2. Do loogin(i know) 3.Click inbox link(i know) 4.Go to every page of mail box and count no.of read mails and no.of unread mails(i know) 5.Store page numbers, read mail count and unread mail count in a new excel file sheet 6.Create 10 types of graphs on that data 7.Do logout and close site(i know) 8.Save new excel files with graph

0 Answers  

how to calculate cable size, olr rating, contactor rating and mccb rating,to below given details three phase motor 75 kw,415 v,.85 pf,50 hz?

5 Answers   Cabin Crew, Essar,

How frequency meter measuring frequency? What is the principle of frequency meter?

2 Answers  

Does power factor vary with speed?If yes, how?If not, why?

4 Answers   Genco,

how can we understand that where we have to use ac or dc coil for solenoid valve and why?what is the different between coil of ac and dc explain please.

0 Answers   TK Group,