Interested to Buy Any Domain ? << Click Here >> for more details...
Do you know how to measure the earth resistance?
- 7 Answers
- 15641 Views
- Manhattan, I also Faced
- E-Mail Answers
Answer Posted / ullas
using two methods:
1.fall of potential method
2.earth tester(device)
factors affecting earth resistance are
1. Shape & material of the earth electrode.
2. Depth of the electrode at which they r burried in soil.
3. Specific resistance of the soil surrounding the electrode
(Specific resistance of the soil varies depending on
moisture content in the soil..... varies from 80*10^3ohm-m
to 80*10^6ohm-m)
| Is This Answer Correct ? | 18 Yes | 2 No |
Post New Answer View All Answers
An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The slip when motor stalls is A 1 B 0 C 13.33% D 10.33%
Why GRR starts from 60% of motor speed why not less than 60%?
If the Brush of DC motor is shifted by 90 deg, then what happens to voltage and torque? Both voltage and torque are zero. how to justify the answer?
How to Calculate Current Rating of SDFU (Switch Disconnector Fuse unit) for Protectionof Capacitor Bank connected to Busbar of 800Amp,in LV side of 11/0.433KV, 250KVA Transformer?
What is the name of transformers oil filteration equipment?
What is the drawback of class b amplifier? How is this minimized?
circuit diagram of trip circuit supervision relay
how to calculate transformer load?
what will be the min and max voltage flow from neutral to earth?
what is conductor constant of raccun conductor
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
what is mean by NPS (Negative phase sequence)fault? what is the difference between EFR & OCR faults?
What types of question are done for diploma students in aptitude test
What happen in ups if phase reverse?
who many types of fire explane with exmple
