Sparking occur when a load is switched off because the
circuit has high –
a.) Inductance
b.) Capacitance
c.) Resistance
d.) None
Answers were Sorted based on User's Feedback
Answer / badshah hussain rizvi
yes its answer is inductance because inductance opposes any
change in current.so when load switched off some current
still flows which leaks due to incomplete path.
| Is This Answer Correct ? | 23 Yes | 5 No |
d.) None
Sparking occurs because a flow of current is broken. When
the 2 contacts are very close the air is ionized and will
conduct. As the contacts open further the arc cools and the
air loses the ability to conduct.
With AC it may be seen that sometimes a small switch sparks
and sometimes it does not. It will depend on the voltage at
the time of opening. At the peak of the sine wave it will
be a big spark at the zero line no spark.
| Is This Answer Correct ? | 3 Yes | 3 No |
There are two nos of 33Kv/11Kv 5MVA transformers conecting through HT cable from substation having metering at substation itself.One transformer used at a time another remains stand by.Further 11 nos of 11Kv/440V transformers are attached on it and each transformer is having its own Power factor correction panel.Now one 33/11Kv transformer at no load condition/Stand by condition is having power factor in leading side upto 0.21 and while when another tranformer at same situation have power factor in lagging 0.42. Now one thing is clear that transformer one is having 1.5 Km long 33kv cable due to that PF goes in leading side and another is having only 250 mtr length remains him lagging. Now i want to know that how i can maintain the Power factor at no load/ stand by position though both are behaving in seperate manner.
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