What should be the value of earthing resistance for large power stations?

What should be the value of earthing resistance for large power stations?
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1 Answer

Answer :

0.5 Ω should be the value of earthing resistance for large power stations.

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Related questions

From the point of view of safety, the resistance of earthing electrode should be

Description : From the point of view of safety, the resistance of earthing electrode should be   (a) Low (b) High (c) Medium (d) The value of resistance of earth does not affect the safety 

Last Answer : A

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Description : What is different between resistance grounding system and resistance earthing system?

Last Answer : In resistance grounding system the neutral point of the load is connected to the ground to carry the residual current in case of unbalanced conditions. Resistance earthing system is done in an electric equipment in order to protect the equipment in occurrence of fault in the system.

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Description : Why the neutral is earthed through earthing resistance in case of UT and SUT? 

Last Answer : This is done to limit the earth fault current.  

In large thermal power stations very fine particulates present in flue gas are removed by (A) Wet scrubber (B) Bag filter (C) Electrostatic precipitators (D) Dust catcher

Description : In large thermal power stations very fine particulates present in flue gas are removed by (A) Wet scrubber (B) Bag filter (C) Electrostatic precipitators (D) Dust catcher

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When the interconnector between two stations has large reactance (a) the transfer of power will take place with voltage fluctuation and noise (b) the transfer of power will take place with least loss (c) the stations will fall out of step be¬cause of large angular displacement between the stations (d) none of the above

Description : When the interconnector between two stations has large reactance (a) the transfer of power will take place with voltage fluctuation and noise (b) the transfer of power will take place with least loss ... out of step be¬cause of large angular displacement between the stations (d) none of the above

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Why we do 2 types of earthing on transformer i.e.: body earthing & neutral earthing, what is function. I am going to install a 5oo kva transformer & 380 kva DG set what should the earthing value?

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Last Answer : The two types of earthing are Familiar as Equipment earthing and system earthing. In Equipment earthing: body (non conducting part) of the equipment should be earthed to safeguard the human ... earthing will be further classified into directly earthed, Impedance earthing, resistive (NGRs) earthing.

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Last Answer : Significance of earthing:  * Earthing means connecting the body of the electrical equipment (it means the part which does not carries current under normal condition) to the earth. For example electrical equipment' ... surrounded by charcoal and salt.  the values of earth resistances for: 

Define earthing. State its types.

Description : Define earthing. State its types.  

Last Answer : Definition of earthing: * Earthing means connecting the metal body of electrical device to the general mass of earth by a wire of negligible resistance. OR * Earthing means connecting the metal body of ... ii) Pipe type earthing iii) Rod type earthing iv) Strip earthing v)Water main earthing

Difference between earthing and grounding ?

Description : Difference between earthing and grounding ?

Last Answer : In grounding the current carrying part like neutral of the transformer is directly connected to the ground. ... The grounding balanced the unbalanced load whereas the earthing protect the equipment and human from an electrical shock.

State necessity of earthing.

Description : State necessity of earthing.

Last Answer : Necessity of earthing:  1. Earthing is grounding the body of the electrical equipment to avoid the hazards due to leakage current. If the leakage current keeps circulating in the body of ... circuit currents.  4. To provide stable platform for operation of sensitive electronic equipment.

Why earthing is essential in electrical installation ? Explain any one type of earthing.

Description : Why earthing is essential in electrical installation ? Explain any one type of earthing. 

Last Answer : Following reasons earthing is essential in electrical installation :   1. To provide an alternative path for the leakage current to flow towards earth. 2. To save human life from danger of electrical shock ... G.I. pipe of size 19mm and funnel for pouring the water in earth pit when required.

What type of earthing is used by transmission lines?

Description : What type of earthing is used by transmission lines?

Last Answer : Preventive  multiple  earthing  PME.

What is the dimension of the copper strips used for the strip earthing?

Description : What is the dimension of the copper strips used for the strip earthing?

Last Answer : 25 mm x 4 mm is the dimension of the copper strips used for the strip earthing.

Which type of earthing is also called as 'fire earthing'? A. Plate earthing B. Rod earthing C. Strip earthing

Description : Which type of earthing is also called as 'fire earthing'? A. Plate earthing B. Rod earthing C. Strip earthing

Last Answer : Option B is right (ROD EARTHING ) 

What is object of earthing? What are types of earthing (Electric power supply Ans)

Description : What is object of earthing? What are types of earthing (Electric power supply Ans)

Last Answer : OBJECT OF EARTHING The object of earthing system is, to provide as nearly as possible a surface under and around a station, which shall be at a uniform potential and as nearly to zero or ... to earth is high, the protective system will not function under a fault, creating a dangerous condition.

State two advantages of interconnection of power stations.

Description : State two advantages of interconnection of power stations. 

Last Answer : 1) Due to interconnection it is possible of wheeling of electricity instantly.  2) The reliability and continuity of the supply is improved with interconnected grid system. With fault ... interconnection, there is optimum utilization of available natural recourses in the country is possible. 

What is a selective fading effect? A. A fading effect caused by small changes in beam heading at the receiving station. B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. C. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station D. A fading effect caused by time differences between the receiving and transmitting stations.

Description : What is a selective fading effect? A. A fading effect caused by small changes in beam heading at the receiving station. B. A fading effect caused by phase differences between radio wave ... station D. A fading effect caused by time differences between the receiving and transmitting stations.

Last Answer : B. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

What is the major cause of selective fading? A. Small changes in the beam heading at the receiving station. B. Large changes in the height of the ionosphere, as experience at the receiving station. C. Time differences between the receiving and transmitting stations. D. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Description : What is the major cause of selective fading? A. Small changes in the beam heading at the receiving station. B. Large changes in the height of the ionosphere, as experience at the ... Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Last Answer : D. Phase differences between radio wave components of the same transmission, as experienced at the receiving station.

Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading effect caused by small changes in beam heading at the receiving station. C. A fading effect caused by the time differences between the receiving and transmitting stations. D. A fading effect caused by large changes in the height of the ionosphere, as experienced at the receiving station.

Description : Refers to an effect of selective fading. A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station. B. A fading ... caused by large changes in the height of the ionosphere, as experienced at the receiving station.

Last Answer : A. A fading effect caused by phase differences between radio wave components of the same transmission, as experienced at the receiving station.

What is Earthing Lead ?

Description : What is Earthing Lead ?

Last Answer : The wire that connects the earth continuity wire and the earth electrode is called the earthing lead.

What earthing is done in hilly areas ?

Description : What earthing is done in hilly areas ?

Last Answer : Sheet earthing is done in hilly areas. Shit electrodes are placed by digging trenches on the slopes of the hill.

What should be the size of rod earthing ?

Description : What should be the size of rod earthing ?

Last Answer : In case of iron or steel rod the diameter is 16 mm but in case of copper rod it is 12.5 mm. In both cases the length is at least 2.5 m. Is to be.

Which earthing is less expensive ?

Description : Which earthing is less expensive ?

Last Answer : Rod earthing is the least expensive. Because the soil does not have to be eroded, the cost is less than other earthing.

How many types of earthing and what are they ?

Description : How many types of earthing and what are they ?

Last Answer : There are two types of earthing , namely _ a) system earthing b) equipment earthing.

What are the essential elements for earthing ?

Description : What are the essential elements for earthing ?

Last Answer : They are _ a) earthen continuity b) earthing lead c) earthy electrode

What is the best earthing method ?

Description : What is the best earthing method ?

Last Answer : Pipe earthing method is best. This is because it is less expensive and when the soil dries out in the dry season , regular earthing can be done by pouring water through the pipes.

What is the color coding of earthing wire ?

Description : What is the color coding of earthing wire ?

Last Answer : The color of the earthing wire is green.

What is Earthing ?

Description : What is Earthing ?

Last Answer : Earthing is the process of safely passing electrical current to the earth's surface with the help of a wire from the metal enclosure of electrical equipment and people to protect them from unwanted electricity.

Why is earthing done ?

Description : Why is earthing done ?

Last Answer : Earthing is done to allow the current to flow to the ground during an electrical fault so that the protection device can work to disconnect the faulty circuit.

Earthing Lead What ?

Last Answer : Earth Electrodes From That Wire Through Earth Terminal Until Connection To do Yes , him Earthing Lead Says.

Earthing-up in potato is done at

Description : Earthing-up in potato is done at

Last Answer : Ans.30 – 45 DAS

Earthing up in sugarcane is done at

Description : Earthing up in sugarcane is done at

Last Answer : Ans.4 month after planting

Earthing-up is done in groundnut crop at

Description : Earthing-up is done in groundnut crop at

Last Answer : Ans.35 to 45 DAS

What is the neutral point earthing and its advantages?

Description : What is the neutral point earthing and its advantages?

Last Answer : In substation all the neutrals of rotating machines, transformers, busbars and other equipment are connected to ground. Some of the advantages are: Earth fault protection is based on the method of ... , grounding of neutral helps to reduce the over-voltages which occur on the one healthy phases

Explain types of Earthing.

Description : Explain types of Earthing.

Last Answer : A:The two types of earthing are Equipment earthing and system earthing. In Equipment earthing: body ( non conducting part) of the equipment should be earthed to safegaurd the human beings ... . This type of earthing is further classified into directly earthed, Impedance earthing, resistive earthing.

State the various types of earthing.

Description : State the various types of earthing.

Last Answer : Solid earthing, resistance earthing , reactance earthing , voltage transformer earthing and zig-zag transformer earthing.

Why is earthing desirable for electric appliances?

Description : Why is earthing desirable for electric appliances?

Last Answer : Ans: Earthing helps the current move into the earth in the event of short-circuit, without giving a shock to the user.

What is difference between earthing and grounding?

Description : What is difference between earthing and grounding?

Last Answer : Both have same meaning. The term earthing is used in U.K. and grounding in U.S.A.ground means earth.

How many earthing should be done for motors? Why?

Description : How many earthing should be done for motors? Why? 

Last Answer : Two. For reliability.  

Why the earthing transformer primary voltage is 16.5 kV rated in main generator even though actual voltage during the E/F is root 3 times less?

Description : Why the earthing transformer primary voltage is 16.5 kV rated in main generator even though actual voltage during the E/F is root 3 times less?

Last Answer : The transformer should not saturate during E/F otherwise it will cause ferroresonance with the GT winding capacitance. Dangerous O/V and neutral shifting will occur. During loss of load or field ... saturation. Saturation can also occur due to point on wave of application causing flux doubling. 

How main generator earthing is done?

Description : How main generator earthing is done?

Last Answer : Generator neutral earthing is done through transformer and earth fault current is limited through resistance, which is connected across the secondary of the transformer. Generator 16.5 kV earth fault current is isolated from 220 kV through GT. Only star point of the generator is grounded. 

What is the purpose of shaft earthing and bearing insulation?

Description : What is the purpose of shaft earthing and bearing insulation?

Last Answer : The voltage generated in the shaft due to the leakage fluxes can circulate current through the shaft. If shaft earthing is not done the leakage current will flow through the bearings to ground and pitting of bearings will result. Hence bearing foundation and pipelines are insulated. 

Why shaft-earthing brush is different from normal brush?

Description : Why shaft-earthing brush is different from normal brush?

Last Answer : The contact resistance should be very low for shaft earthing brush, to prevent even small current through the oil film, so used copper magnite brush or silver carbon brush.

What should the statutory provision of earthing?

Description : What should the statutory provision of earthing?  

Last Answer : a. Earthing shall generally be carried out in accordance with the requirement of India electricity rule 1956, as amended from time to time and the relevant regulations of the electricity supply ... , etc. used in earthing shall conform to Indian standard specifications, wherever these exist. 

What is difference between earthing and grounding?

Description : What is difference between earthing and grounding?

Last Answer : Both have same meaning. The term earthing is used in U.K. and grounding in U.S.A. ground means earth.  

Sweeps are used for? a Seedped preparation b Ridging c Earthing plants d Mulching

Description : Sweeps are used for? a Seedped preparation b Ridging c Earthing plants d Mulching

Last Answer : d Mulching

In a cable immediately above metallic sheath _____ is provided. (a) Earthing connection (b) Bedding (c) Armouring (d) None of the above

Description : In a cable immediately above metallic sheath _____ is provided. (a) Earthing connection (b) Bedding (c) Armouring (d) None of the above

Last Answer : (b) Bedding

How do you clean an Earthing mat? ?

Description : How do you clean an Earthing mat? ?

Last Answer : Mats can be cleaned with ordinary dish soap and water.

Can you connect an Earthing sheet to the electric outlet on a cruise ship?

Description : Can you connect an Earthing sheet to the electric outlet on a cruise ship?

Last Answer : You may want to check with the cruise company first. It is likely that a cruise ship would be well grounded and the use of in-cabin outlet grounds should work well.