Interested to Buy Any Domain ? << Click Here >> for more details...
what is the safe meggar values for motor, transformer HT, LT
and Cables?
- 12 Answers
- 52025 Views
- IOCL, Jindal, TATA, I also Faced
- E-Mail Answers
Answer Posted / keith
If you need it to keep working, such as a sewage or storm
water pump,most reputable companys would trend the readings
beginning with the date the started servicing the motor and
watch for a dramatic decrease in test readings. One has to
be aware of the capacitance effect that water has on the
motor cable of a submersible pump as well as understanding
that it is normal to see a gradual decrease over a several
year period from above 200 megaohms @ 500 VOLT d.c. ( brand
new)to eventually down to 10 to 20 mega ohms. I have found
that although motors will run down to 2 mega ohms 230 volt
3 phase and 1 mega ohm to .6 mega ohms 480 3 phase they
don't run much longer. More important is to recognize
dratic decreases between monthly to quarterly readings as
they indicate potential failure ( direct short to ground)
which could trip main distribution breakers, thereby
effecting other motors or equipment by robbing them of
power. i.e. Alarm cicuits that are not battery back up
equipped.
| Is This Answer Correct ? | 7 Yes | 0 No |
Post New Answer View All Answers
Mention how NPN and PNP transistor works?
In HI POT test what is reason for applying the AC VOLTS and DC VOLTS in different applications what is the nessesity for this ?
Hello to all, Please someone can send me HPCL ELECTRICAL Engg. Sample papers to me? Its urjent....my email address is.... raviasiapacific@gmail.com
What is pi controller?
what is ramping rate of generator
why starting current is high and resistance is almost 0 during the starting of motor dc motor...?
why would the rotor rotate at sub synchronous speed against the direction of rotating flux when d rotor of 3 phase IM is connected to 3 phase balanced supply and the stator windings are shortcircuited ??
What is the diffrence (Technical & Construction ) between CBCT & Normal CT?
why zero sequence impedance measurement is not applicable for single phase GT
How to select cable the size, what is the parameters use and what is the formulas use for this cable size calculation?
how to identify conection leads of an unknown electric motor
how to wiring it with contactor and timer together
How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?
what do you mean by every IC 74 first digit.why are you using this no.why not using another no.
Define conversion efficiency of a power amplifier.
