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.
Answers were Sorted based on User's Feedback
Answer / ankurjha
May be some other load is coming in line at night time. see
for unautherized taps in line..
Is This Answer Correct ? | 3 Yes | 0 No |
Answer / karthik
better change all mh fitting to other energy efficient
fittings atleast change the copper wound ballast to
electronio ballast
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / h r jadhav
pl check the maloperation of mcb or correct rating of mcb/
secondly the power factor may be very low of the metal hal
lamps during day time that may be compenseted by bus
capacitors and which are disconnected at the time of no
work. there by increasing current and mcb get tripped/ pl
use energy efficient electronics ballast.
Is This Answer Correct ? | 0 Yes | 0 No |
Answer / k.prakashchandra
You should allow 5% to 10% tolerance for MCB and
meters.There could be temporary additional load also.
Is This Answer Correct ? | 0 Yes | 0 No |
What is the Polarisation index value ? (pi value)and simple definition of polarisation index ?
A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram
Three phase star connected PT transformer primary side one phase fuse is blown what will be the output in secondary side(Secondary side also three phase star connected)
What happened when voltage will half value of current ...
A Question Like A Wire Is Wound Whose Resistance Is Some 132. 44647 Ohms. If A Voltage Of 30 mv, 296 Ma Current Is Applied To It What Is The Resistance.
how can we measure rotor current of a 3phase wound rotor induction motor connected to liquid resistance starter
how can we Increase the Value Of Frequency in electric circuits
What is the Diff. btw Fire Alarm System & VESDA System??????
Q2). When 3 dice are simultaneously thrown, which of the following would be obtained? (a) Result 1: “A 5, a 3 and a 6” (b) Result 2:” A 5 three times” (c) Result 3:”A 5 twice and a 3” (d) All three results are equally likely. (Musigma Question)
What are the insulation standerds for eg H clase and how many insulation standerds are there and its standerds??????
why generation of electricity in low value voltage
Can anybody tell me the Electrical IS rules website?