can u tell the difference between star - star transformer
and delta to delta transformer?
Answer Posted / dinesh
1. Star-Star(Y-Y) Connections.I gives line voltage √3 times
phase voltage. It is economical for small high voltage
transformers as the number of turns per phase and the amount
of insulation required is less. There is no phase shift
between primary and secondary voltages. The drawback is that
the neutral is unstable because of third harmonic component
in the exciting current.
2. Delta-Delta (Δ - Δ ) Connections. The arrangement is
generally used in systems which carry large currents on low
voltages and specially when continuity of service is to be
maintained even though one of the phases develops fault.
There is no phase displacement between primary and secondary
voltages. There is no distortion of flux as the third
harmonic component of magnetizing current can flow in the
delta connected primary windings without flowing in the line
wires. The conductor is required of smaller x-section as the
phase current is 1/√3 times of the line current. No
difficulty is experienced due to unbalancing of loads on the
secondary side. The disadvantages are that more insulation
is required and the voltage appearing between windings and
core will be equal to full line voltage in case of earth
fault on one phase.
(techie.dinesh@gmail.com)
Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
Can I use star delta connected induction motor for dual supply voltage?
which of the following elements is not present in stainless steel
What is dynamo?How it works and what is the function of dynamo in a DG.
If anyone would like to know or practice for FEWA papers contact me on mohamedrashad2@hotmail.com Just completed the supervisor exam in April 2021
application s to shunt coil
how to identify the cable quality and what is flame proof cable
Why do we need a separate control desk & PLC control panel in Boiler plant or coal handling plant? Can we provide cost effective Control desk cum PLC panel. Is there is an specific need for control desk.. kindly advice.
how diside ct mf exmp.200/5 ct
what is the minimum recommended leakage current of an earthed cable connected to the body or skid of an alternator
determine two methods to find loose connection in operational electrical system?
sir please tel me how calucalte kwh if home taken load 30ams how maney kwh taken per day.and 3phase motor 5hp per hars how maney load teken and how mach kwh and forward me to electrical table for calicalte kwh and kvr and kvah
Difference between transition and diffusion capacitance
Do u know any one? how to find out in motor rated amps? formula?
how wecalculate breaking capcity of acb mcb mccb .explain with example
what is the function of anti pumping relays? what is KVAR? How it is generated in alternator? What is 3rd Harmonics? What is IDMT relay?