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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
2212Why the meters sonnected to metering core of CT are not damagedon event of a fault??? Explain the phenomena??
1 5464How to determine earth fault level to set relay for a normal distribution system of 11 kV , 100 A load????????
TCS,
1 4304Why the Transformer connection is changing in different transformer?(Like Star & Delta,Delta & Delta,Star & Star,Delta Star) From that connection where it is used?
2 71321)What will happen when 240 VDC supply is connected to 240VAC supply(DC supply +ve is connected to phase of AC supply & DC supply is to neutral of AC supply). 2)Also what will happen when 240 VDC supply is connected to 240 VAC supply in reverse polarity as of Sr. No 1.
2 5000What will happen when more than one star neutral points at same voltage level are connected to earth by metallic conductor?
TCS,
1 4255What is the unit of inertia constant of rotating machines? Which has more inertia constant between turboalternator and hydroaltermanor and why?
2 16773Can the efficiency of transformer be measured with the help of wattmeter readings taken at primary and secondary side? Support the answer.
2 5181Classical power system stability was mainly focussed on rotor angle stability but modern power system stability has more focus on voltage stability.Why?
4 7726Post New Electrical Engineering Questions
In which working principal temperature transmitter work.explain in detailed.
Pl. share your experience about industrial-electronics repair of machine tool.
if 6 earth pit value is 1.5 ohm then what should be the number of earth pit to make the value .8 ohm
What is the angle of inclination for the oil connection from transformer conservator to Bucholz relay and why?
What happens when ac supply is given as excitation voltage instead of dc supply
A system absorbs 100 k J of heat and the increase in its internal energy is 100 kJ; the work done is
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what are the dimensions for 200 kva transformer plinth (plateform),in which pcc m20 is used..
Hoe do calculate the Cable size for Amps rating ?
when we decide to use soft starter drive or vfd drive in mcc to operate apump?
Write down the name of 2 lady Bir Pratin of Bangladesh
What is sink and source?
if we install two earth pits with a clear space of 5m without any interconnection,by checking the digital multimeter will it show continuity between earth pits? If so what would be the approx. value
Is there any abbrevation for STUB in Stub bus protection
Convert a star connected network into a delta connected network.
