Answer / sagar khatri

There r many reasons behind low voltage..
1.. due to fluctuation of lv side supply
2.. if your equipment is connected parallel with higher load like higher rating induction motor then its will affect the supply voltage during starting of macine
3..and other one may be loose connection..

Answer / durgapriya

Low voltages caused due to overloading of a phase.As current drawn by the loads increases,the losses in a line increases..this causes a drop in voltage that the consumer mains..for example..the voltage of 230v..the maximum permissible low voltage at service mains is 216 volts..[a decrease of 6% of rated voltage]

Answer / thomas aquinas nzo

If one of phases is feeding on the other this can lead to those at far end receiving low voltage and if care is not taking you end up burning the winding

Answer / pravesh

as we know the equation of power in single phase circuit
that if P= VI COS PHI

I IS CONSTANT for rated equipment
POWER IS CONSTANT

SO V= P/(I cos Phi)

as we have inductive load in home so power facter varies
thus voltage is inversely proportional to the power
factor.hence the voltage fluctuates due to variation of
power factor

Answer / s.karthik

According to me,there are two possible reasons for low
voltage,one being poor voltage regulation by the utilities
which is normally not the case and the second one is sudden
increase in demand..

Answer / gkumar

Due to low power factor by using highly inductive loads
simultaneously such as motors, a/c's, heaters,geysers dis
coz low power factor
& results in low voltages.
"to Gharwale bolte hai bijli kam aa rahi hai"

Answer / prabakaran

In Low voltage systems needs only lower cable insulation
levels, thus decreasing cost of wires & safe to operate,

Answer / abdul wajid

because all the household appliances are designed to
opreate on low voltage and current is directly proportional
to voltage so less voltage means less current

Answer / suman mudulakar

generallly at the transformer lowvotage side carries high
current,eventhough it is distributed to houses bcoz of
current division is being happen.As more number of houses
more the load and more the current division. the apparatus
operating at high votages needs more insulation,it is not
possible. with that the size of apparatus increases and
accupies more space area.To decrese the level high voltage
we need to connect high values of resistors in
series,threby more the losses and less the efficiency and
it dissipates more heat.

we are having 110 Kv,250mA Electrostatic precipitators for coal fired boilers. what will be static voltage and current after discharge and what time it will remain before earthing?

0 Answers   Siemens,

I have calculated load for an office building which is 1200 KW as all the load is single phase therefore its 1200 kw single phase. Now i have to design Transformer and Generator for this load Please kindly give me exact answer that how much capacity of Three Phase Transformer and Three Phase Generator is required for this load.

3 Answers  

What is over fluxing in transformer?

1 Answers  

what is the difference b/c choke and ballast?

1 Answers  

In one village i have seen Earthing transformer's earthing line was also connected to the Transformer body to ground the transformer,can it be possible to maintain 0Volt reutral line this way?

2 Answers  

as per IE stranded what is max voltage between neutral to earth. 100 kva transformer neutral solid earth. min and max values i need to ans for RTI question

2 Answers  

how we can find out the speed of fan without using any measuring instrument

2 Answers  

how does a shunt reactor maintains the bus voltage???

0 Answers  

Why transformer making sound during operations?

2 Answers  

better choice of area of interest to post in our resume?

2 Answers   Cognizant,

what is a motor

5 Answers   Eskom,

1. alternator has full load regulation of 4% when pf of the load is 0.8 lag, 1500 rpm. full load regulation of 1400 rpm for 0.8lag will be ________ ?? 2. torque angle of a sync m/c operating from a constt voltage bus is usually defined as space angle between _______ . 3. method most effective in finding out no load losses in large DC shunt motoris ______ . 4. current carrying capacity of fuse material depends on ______ . 5. coil has res. 10 ohm, inductance 1H. what wil be current after 0.1sec after switching on to a 500V DC SUPPL ? ? 6. effect of phase lag compensation on servo systems ___________ . 7. rotor of a dc machine is usually supported upon ______ . 8. DC motor is preferred to AC motor in which application ?? 9. 3 nos of 10:1 Xmer are connected in Star-Delta to supply a load at 230V.the supply voltage must be ______ . 10. voltage source produces max current in which circuit. 11. cal. power, if current and voltage are out of phase by 90 degree. 12. suitable length of Xmission line of power at 66 KV. 13. Which of the theorm helps in simple computation when the load across a ckt is varying ?? 14. what is the adopted line length for power Xmission of power by cables ??

5 Answers   TATA,