Failure of AVR means AVR will not deliver the excitation
voltaage to the exciter winding.Hance Excitor winding will
not be able to generate any excitor voltage.So there will
be no any field votage to rotor field winding and due to
this even if DG continious running but there will be no out
AVR-AUTOMATIC VOLTAGE REGULATOR. AS THE NAME IMPLIES IT IS
USED FOR THE REGULATION OF VOLTAGE & VOLTAGE BUILD UP
PURPOSES.IT CONSISTS OF (VOLTAGE SENSING UNIT,VOLTAGE BUILD
UP CKT,PULSE WIDTH MODULATION CKT,etc...,).OBVIOUSLY IF AVR
FAILS THERE WILL BE NO VOLTAGE.SO DG RUNS WITHOUT VOLTAGE
AND THERE WILL BE NO LOAD.
it depends upon which type of avr is that .. if its an
static one than it will get tripped and no dc output and dg
set will not generate any voltage. but if avr having no
interlock with excitor than if avr fails than it will only
affect the regulation of voltage as excitation voltage is
already generating and being given to alternator so output
will be there but non-regulated
I have carried out wiring for lighting in a shed in
Industrial area which contains Metal halide lamps & have
balanced in 3ph.Now when we put all the lines on in the
daytime the current taken at 3phases at MCB comes to be
equal i.e.28,29,28Amps respectively but in the night time
i.e between 7p.m.to 11p.m. at the same MCb the current is
52,59,62Amp, though I have fit 63A MCB it is tripping in
the above period.What may be the reason.?
Note: This industry is located in industrial area where
majority of steel ingot manufacturing plants are there.
Whether this may be due to harmonic? what should I do to
overcome above problem.pl suggest urgently.