What are safety seals?

1 Answers   HSL,

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What is the difference between ACB & MCCB?

7 Answers  

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We know flow of electron is current . But why electron flow from negative to positive and current from positive to negative?

4 Answers   Power Grid,

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why autotransformers are not safe for supplying low voltage from a high voltage source?

5 Answers  

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I do wonder why current is present in neutral wire?i check single phase lead current feeding air conditioner...on its phase its current was 10A while same was 10A in neutral...as we know in neutral voltage is zero so if voltage is zero then how current appears on amp meter? my second observation is (just imagination)when I touch phase wire it give me shock but when i touch neutral nothing happens although as above its carrying current(amps) third but with same logic...as in simple Alternate current sine curve there is + and there is negative peak.means every time phase changing so how come every time same phase and same neutral stand (pardon for english mistakes)

1 Answers  

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the rating of fuse wire i always expressed in what?

3 Answers  

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in 3 phase induction motor resistance value is how much

1 Answers  

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What is the Derating factor of power cables when exposed to direct sunlight in (both PVC & XLPE).

1 Answers  

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Advantages of using generator circuit breaker (GCB) scheme in a power station ?

0 Answers   Gridco,

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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<

0 Answers   Lupin,

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why the voltage level in transmission line are in multiple of 11kV, 22kV, 33 kV etc..( i.e., 220 V )?

4 Answers  

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will a bulb glow connected to two phases of a delta connection?

6 Answers  

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