Interested to Buy Any Domain ? << Click Here >> for more details...
how to calculate circuit breaker capacity
- 6 Answers
- 75187 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / usama badran ali
el salamo aleekom
to calculate circuit breaker breaker capacity...there are
four steps :
1-indicate all actual nominal voltages and MVA of your
system
2-indicate the location of circuit breaker.
3-calculate the actual impedance between the known supply
to the point of fault at which near to circuit breaker.
4-then calculate:
a- short circuit current =
voltage of supply/((3^0.5)actual impedance)
b-MVA short citcuit=
(3^0.5)*voltage of supply*short circuit current
c c-breaking capacity=
MVA short citcuit*assymetry factor.
or
short circuit current*assymetry factor
notes:
Assymetry factor:1.5~1.6 for midium voltage
1.25 for low voltage
MVAshort circuit= fault level
breaking capacity: it is the value of peak current where
the circuit breaker is breaking.
| Is This Answer Correct ? | 8 Yes | 11 No |
Post New Answer View All Answers
how cables go in and come out for distribution from the feeder pillar box?
What are the advantages and disadvantages of short-pitched winding?
Where can i get practical knowledge of solar system?
WHTA IS LIMT OF LEAKGE CURRENT OF 11 KV 1 CORE 1000SQ.MM. XLPE CABLE.LOAD ON CABLE IS AROUND 600AMP .LENGTH 500 MTRS.
What cmos is and its benefits?
what id a dry type transformers and its function ?
What Normal(Tangent) towers and Tension(Cut-point) Towers?
how can we say that stator magnetic field rotates with synchronous speed?can we derive?
Is it acceptable of installing an earth pit in planters area where bare copper cable, earth rod and connection are susceptible to corrosion due to water?
WHY RATING OF VCB NOT LESS THAN 630A
Parts of machine and their discription in details with suitable photo
HOW WE CALCULATE CURRENT IF THERE ARE NOT PRESENT ANY AMMETER OR MULTIMMETER??????
1. A bomber drops a bomb from an aircraft flying at 2000 km/hr. at an altitude of 7km. The speed at which the bomb will strike the earth would be
what's prime importance of protection in electrical system.if protection system don't work properly what can happen in electrical system?
Why do we use copper cable for HT Supply and why not Aluminium?
