Answer / d.s.david

Overload current istaking place when a device taking
continuous over current from the supply source but short
circuit current is a fault current taking place in the laod
by earth fault or phase fault.

Answer / asutosh

short circuit current is of the order of 100 times that of
normal rating & it is expessed in kA.

the increase in normal rating due to anything rather than
short circuit is kwon as over load current

Answer / murali krishna m

Short circuit means there is no resistance, so it will
produce high curent.
Overload means the device draw excess of currrent from the
supply source. due to this the source will be burn or
dameged.

Answer / sennapparajan

shart circuit current-if happens only pahase to pahse short
or phase to earth.

over laod current- it happens only when machainary or
motors take current beyond the ratings.

Answer / raghu

Short circuit means the current passing though conductor
by-passes the connected load. This happens when the metal
wires come in contact at an unwanted location, generally due
to failure of insulation. Numerically, the resistance
connected to the circuit becomes nearly zero and thus the
current, i=v/R = v/0 = infinity, causing damage to source,
conductor. A fuse saves the situation by melting due to high
current and the source is disconnected to avoid further damage.

Short circuiting is possible in a circuit (eg: home wiring)
as well as inside a electrical device (eg: motor) in its
internal circuitry.

The term "Overload" may refer to a circuit or a device.

When too many devices are plugged in to a circuit (eg: many
appliances in a single power socket) and if the total
current requirement is much more than the "design current
capacity, (rating)" of the circuit, the circuit is said to
have over loaded. Here also,as in short circuit, current
drawn is high causing damage to circuit or source.

Continuous malfunctioning or faulty working of devices may
cause overload. Due to some specific reasons (over heating,
no-load running, high-load running), the internal circuitry
of the device gets partially short circuited. Hence the
capacity of device gets reduced (as if a half HP pump is
used where 1 HP is required); however, the device continues
with its work at a reduced resistance but with a huge task
at hand. Thus the device is said to have overloaded. The
overloaded device draws high current (due to reduced
resistance) from the circuit and thus causing damage.

Short circuiting is a sudden action/ response (spike in
current) while overloading is a slow process(excess current
is being drawn for a large duration).

Answer / nagarajan

First of all overload currents having sinusidal wave the
peak value of current is same but magnitude will be high
but short circuit currents has no sine wave,more over this
is called over currents this is by sc not by over
loads.unsteady sine wave peak will be uneven and high

Answer / sudheer

short current is getting fault current and over load
current get more current from the supply source

Answer / kpower

It is an electrical circuit is one that allows a current to
travel along a different path from the originally
intended.During that time a high electricity is produced

Answer / rishabh sharma

Overload caused due to Mechanical/Electrical wear
tear/damage but short circuit is due to electrical fault only..
Overload can result into short circuit...

Answer / marino b manuel

Short circuit current, the resistance is infinity while the overload currents is excess current or rating from the load.

what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?

0 Answers   Faurecia,

Can anybody please refer the best and simple book for about Protection relays and in detail of all its protection ?

0 Answers  

how braking & making capacity of circuit breaker is calculated?

0 Answers  

Generally In transformer Tap Changer on HT side, but I have seen in 66KV side in 220/66 KV, 100 MVA, Areva make transformer. Why ?

7 Answers  

In India,we use 230V,50HZ,where as many other countries use 110V,60HZ what r d advantages and disadvantages of each of them?

8 Answers   GVK,

what is STUB protection in tranmission system and switch yard area?

9 Answers   KSEB, Power Grid,

what different in delta & star connection in motor?explain

5 Answers   Bhushan Power Steel, Hyundai, KPCL, L&T,

1. what is the meaning of bus? 2. what is the dc transformer? How it work 3.what is the function of the serge absorber? 4.How the CT and PT rating calculate/

1 Answers  

dielectric strength of vacuum is greater than SF6 but for 132Kv uses sf6 breaker & for 33kV uses vaccum breaker why such a contradiction?

2 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

electrical ques

0 Answers  

which type of motor complete it's one rotation in 30 day's.

2 Answers  

I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers