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Why we connect the capacitor in Delta?if we conect in Star
what will happen?
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Answer Posted / pravin m sonwane
in medium voltage Delta connection or star ungrounded is
mostly used because of
1)Harmonic current is circulated in delta loop, hence no
damage to system
2)Across capacitors phase voltage is present.
3)more efficient configuration than other like star, star
grounded, star ungrounded, double star neutral may or may
not be isolated, double star with neutral grounded.
4)No zero sequence or third harmonic currents can flow in a
star-connected capacitor bank. Additionally, where one
series group per phase is used, the individual capacitor
fuses should be capable of interrupting the system
short-circuit phase-to-phase fault current.
5)The greatest use of A-connected banks is at 2400 V, since
this is the lowest standard capacitor voltage rating.
6)As zero sequence or third harmonic is absent, less
protection to bank is required. hence less costing in such
capacitor configuration.
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