Answer / rvg

The transformer details shows no load voltage and we can
assume about 3-4% decrease with full load. ACB with rated
voltage 690 should not be suitable for 725V. ACB's nominal
voltage should be 1.414 time the applied voltage.

Answer / mnm

Your selection is OK. Any breaker will have 110% voltage
withstand capability. Only thing is interruption capability
reduces, which is not relevent on no-load. On load, the
voltage of the transformer will reduce by nearly 6%, due to
impedance, making it just suitable.

Answer / praveen kumar gupta

ACB is not suitable as transfomer secondary voltage level
is higher than ACB voltage level which cause insulation
failure of the ACB and cause of flash.

Answer / loke

We can agree with Mr.Mnm because actually the rating of
breaker ia 690v and it will be having with stand capacity of
+_10% so it can with stand upto 765v & also check out with
the impedence it would be around 6-9% from that also you can
check secondary voltage of t/f.

Answer / joe

there wil be no effect because in transformer the input and
the output is difference due to the coil winding

in a 740 kw dc seperately excited motor field voltage is constant about 17.4 volts and armature voltage is500 volts dc. how it is possible to have two different voltages from single transformer of output voltage 500 volts? if any difficulty in question contact ajitsingh.kadian@gmail.com

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