Interested to Buy Any Domain ? << Click Here >> for more details...
What should be the earthing resistance of an industrial
substation and also What should be the house hold earthing
resistance?
- 20 Answers
- 113556 Views
- Jindal, Pharma, TAAT, TATA, I also Faced
- E-Mail Answers
Answer Posted / manoj mahajan
The Earthing Resistance of a household should not be
greater than 5-Ohm. This is in keeping with the Indian
Stadards, so also the international standards, viz, IEEE
(Institution of Electrical & Electronic Engineers) and IEC
(International Electrotechnical Commission) which stipulate
that no Earthing Resistance shall be greater than 5-Ohm.
The restriction is required to ensure the safety of the
occupants and the electrical appliances.
The Earthing Resistance of a Power Station should not be
greater than 0.5-Ohm because a Power Station is required to
carry high earth currents.
The Earthing Resistance of a Major Substation such as
a "Receiving Station" or a 400kV/220kV/110kV/66kV etc
Transmission or Stepping Up/Down Substations should not be
greater than 1-Ohm.
The Earthing Resistance of a Minor Substation such as an
11kV/230V Distribution Substation should not be greater
than 2-Ohm.
This clarifies my first answer.
| Is This Answer Correct ? | 104 Yes | 6 No |
Post New Answer View All Answers
how to find motors H.P. whout any rating? (only give you a motor and multimeter)
What is the slip speed?
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
explain different losses in a transformer.
3- What is the target from Zero Impedance, Single Phase Imp., S/C Imp. and magnetic balance tests?
How we calculate the Multiplying Factor of Kwh meter for 3 phase alternator.
pls,send the previous year written test questions.
Disadventage of cable-gland earthing if any ?
Why different Pressure switch used in marine boiler water circulation system
How to control motor gearbox speed and friquency? If length of cable and dia given, how to measure the voltage drop?
For R-L or R-C ckt,time constant formula is L/R and RC respectively and its unit is in sec.Pls tell me the derivation
How to calculate no of EARTH PIT? Describe the formula as per IS standard?
Which device is used for the source of emission of electrons in a crt?
How RTCC panel is working and give single line diagram for RTCC with transformer?
what is the transiant condition in alternator? and how it can be prevanted?
