In one of the industrial site, the no earthed system has been chosen in electrical designing stage. Therefore nobody anticipated a strong earth fault current in the system.

According to IEEE 665 – section 5.5.3.1 page 27, it is important for the ground conductor to run as close as possible to the phase circuit conductors; since it will cause the fault current return path reactance to be reduced.

The electronic control systems in one power plant are digital base and separated "one point" grounding system is considered for it.

We have 25 earthing pits in telecom building these earthing pits conneted with each other with a lop could any one tel me in detail.

A design query on earthing trafo.
An earthing trafo installed on a 11 kv switchboard is rated for 381 kva , 11 kv/ 110v in a star - broken delta arrangement. A resistor rated 1.14 ohms is connected across the broken limb.

Is there any potential hazard in bringing the neutral of several 11kV/400V Dyn11 transformers to a common earth bar and then connecting to the earth pits?

How to design a neutral grounding resistor for 5 MW generator and what are the points to be considered before design a NGR for generator? Kindly give some design methods or articles regarding this.

I was going through 11kV schemes.For every phase R,Y,B there is an individual Potential transformer for the outgoing feeder.

According to electrical basic design of one industrial plant, contractor shall supply suitable grounding transformer with an additional NGR in its neutral connection for limitation of ground fault current system to 400 A.

What is the origin of neutral bar voltage and how we can reduce it?

What is the advantage and disadvantage of combination of power transformers MV/LV grounding systems? Whether can we use the cable armor as grounding conductor in power system?

How can we choose the neutral wire size in various grounding system? Is there any guideline for non liner loads conditions?

Recently we have carried out the periodic inspection in a manufacturing plant. This plant has a 6.6kv network supplying 3 remote buildings each with transformers. We found that the Zs readings throughout the installation in one of the buildings were high compared to previous inspection reports.

We have a 11kV/400V 4MVA trafo with 97kA short ckt rating. Can u suggest for the neutral grounding methodology keeping high shrt ckt rating of the system

What consideration shall be taken in lightning protection grounding systems? Are there any estimation for lightning current surge?

i want to know how do u calculate the ohmic resistance value of ngr for transformer protection,say if i do provide u primary seconday voltage ,current of transformer.

In parallel operation of generators, Sometimes the neutral point of one of them is grounded and other not. Are there any technical reason for this operation way?

  

What is advantage and disadvantage of various grounding systems such as solidly, low impedance or high impedance grounding systems?

What amount of grounding impedance shall be considered in grounding system planning stage?

Why do we ground positive terminal of electro-static-precipitator (ESP)?

Is there any technical guide for choosing  the best grounding system between IT,TT or TN systems?

I urgently need the main earthing conductor sizing calculation of 132kV substation

Is it possible to connect such a transformer solidly grounded ( 10/0.4 kv Dyn11 auxilary transformer ) in same grounding as individually high resistance grounded 10kV generator units?

In my house we do not have access to earth, can we use neutral wire instead of earth electrode for grounding of metal enclose of electrical equipments?