Answer / vishal ingle

Harmonics are the integer multiple frequncy signals present
along with the fundamental frequency in a circuit. e.g.
2nd harmonic freq = 2*fundamental freq.
3rd harmonic freq = 3*fundamental freq.

Answer / ghanshyam_singh

i think the presence of current of higher frequencies in the
circuit is termed as harmonics.

Answer / anindya basu

Harmonics is nothing but a disturbance in pure sine wave line
voltage

Answer / bala

A harmonic of a wave is a component frequency of the signal that is an integer multiple of the fundamental frequency, i.e. if the fundamental frequency is f, the harmonics have frequencies 2f, 3f, 4f, . . . etc. The harmonics have the property that they are all periodic at the fundamental frequency, therefore the sum of harmonics is also periodic at that frequency. Harmonic frequencies are equally spaced by the width of the fundamental frequency and can be found by repeatedly adding that frequency. For example, if the fundamental frequency is 25 Hz, the frequencies of the harmonics are: 50 Hz, 75 Hz, 100 Hz etc.

In transmission line 11kv,33kv etc are rms values are peak or others??

1 Answers  

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Why the wave trap is put in Y phse only in switchyard?why not in other phases?

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when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

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Is there a possibility to use such a treshold voltage for the NMOS part of a CMOS circuit that during the switching it will start conducting only after the PMOS part will be already closed, by this eliminating the leakedge current? Please note, I'm not asking about the well bias in standby mode, but about the "antileakedge" measures during normal operation.

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in three phase 11kv transformer (11kv/433v) input( R,Y,B) output (X,Y,Z,N) the connection as follows 1 phase R -open 2phase y connected to both R and y of input] 3phase B- B what is the output voltage X to N ,Y to N , Z to N

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how to calculate the current carrying capacity of a 25 & 16 kva distribution transformer.

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Is it necessary to place tap changer in secondary winding or we can use on both sides?

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how electronic energy meter works?

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The neutral&earth voltage is 0v.But we were connected the lighting load at the time ballast was failed.why?

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When are the directional relays used?

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