what is field flash
Answers were Sorted based on User's Feedback
Answer / rakesh ranjan sharma
It is the process by which the reversed polarity of residual magnetism can be corrected by using an external dc source to remagnetise the field poles in correct direction.........
Is This Answer Correct ? | 9 Yes | 2 No |
Answer / monika
In alternators it is necessary to have some resudual
voltage to buildup an voltage. The residual voltages
weakens because of ageing & keeping at rest condition for
long time. In this cases using external DC sourses will
applied to field terminals to create residual. This process
is called as field flashing.
Is This Answer Correct ? | 5 Yes | 0 No |
Answer / k.prakashchandra
Static exciter uses thyristors for converting AC to
DC .Thyristers require a minimum voltage to conduct,for
which the voltage created by residual magnetism is not
sufficient.To bring the generator volage to the required
value ,field flashing is done with dc source or AC through
rectifier.Once the required voltage is built up,the
generator output will take over the excitation with field
flashing off
Is This Answer Correct ? | 1 Yes | 0 No |
why florescent light was flickering?
Why mostly conductor made by 7 nos wire?
How to test and satisfy the conditions of the vector group YNd1 for power transformer?
what is the function of series reactor
3 Answers Adhunik, INOX, RMSI,
In order that work may be done:(a) Two wires are necessary(b) The circuit must have a switch(c) Coal must be burnt(d) A supply of energy is required
what is the difference between neutral and earth
HOW WE KNOW IN PHYSICALLY THE CONTACT SURFACE OF A VACUUM INTERRUPTER IS GOOD OR GOING TO DAMAGE IN A VCB AFTER ABOVE 500 TIMES OPERATED.
230v 1 phase Phase and Neutral insert in Bulk water what happens.
why does a dc machine has high efficiency while working as a generator than as a motor
How can you sized or estimate the ligthning arrester current rating?
what is mean by NTPC?,why didn't electric shock in train?
Are Refrigerators & Deep Freezers the Inductive load ? How to calculate the Power Factor & hence the Output Power for them ?