What is the d/f between DOL & star delta starter & automatic
star delta starter?
- 23 Answers
- 157961 Views
- ACC, Dalkia, Engineering, Indeco, NINL, Novotel, RMH Control Systems, Wipro, I also Faced
- E-Mail Answers
Answer Posted / ankur mishra(moradabad)
In DOL starter full line voltage is fed to motor which will
start motor with a shock, it also draws very high current
than rated current(around 6 times), but if we use star-
delta starter , the motor starts as a star connection later
which is converted in to delta.
using star connection the line voltage is devided in two
phase voltages, also impedence is also increased due to two
star windings which result in low starting current and low
torque which will prevent motor to run with shock.
another difference is DOL starting takes less time while
star-delta takes more time to run at rated speed.
| Is This Answer Correct ? | 91 Yes | 13 No |
Post New Answer View All Answers
Why does the rotor rotate?
Wind mill
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
Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices
distribution transformer de-rating formula on over limit iron losses
what the function breaker failure scheme, how is it operated
Dear Mr B C pal...Can you plz. put some light on principle of operation of Z-Ct in conjunction to its use with 1Cx1000Sqmm HT Cables & Directional Ground Fault / Over Voltage Relays...Regd..Parag v K 9899115632
In synchronous motor, how the field current is related to armature current..i know its inversely proportional..but concept wise...i was nt clear....pls help me...
Show Details FROM:Muhammed Ikram TO:qa@allinterview.com Message flagged Saturday, June 4, 2011 10:07 PMMessage bodyHello all, i want to ask a question to all of you that what is VMM (voltage monitoring module )? how it work,s? i heard somewhere that it compare 1 phase voltage to other phase voltage. but there is also some setting on it. how to set it,s setting. please tell me briefly. Thank,s and Regard,s. Muhammed Ikram.
sir pls send the je exam - 2008 and other model question papers..
how to find impedance , mutual indatnce in transmission lines
To prove the capacity of a 10MVA transforemr with 6.5% impedance by a short circuit test how much power is needed to inject an impedance voltage if we have to arrive for its rated current?
how to identify conection leads of an unknown electric motor
What is A check, B check, C Check & D check for a diesel Generat
Is there any specialised book to refer about fault level calculation both in MV and LV side??
