how much insulation resistance 11kv & 33kv under ground
cable between earth to phase & phase to phase.
- 4 Answers
- 27569 Views
- Siemens, I also Faced
- E-Mail Answers
Answer Posted / praful
Thumb rule to measure the IR value is add 1.5 to the
operating voltage (convert the voltage in KVolts) the
answer is the min. required safe IR value (Mega ohm).
For Example the Operating voltage is 22kV then 1.5 + 22 =
23.5. 23.5 Mega Ohm is the min. IR value required.
The IR value must alaways be on higher side.
| Is This Answer Correct ? | 28 Yes | 11 No |
Post New Answer View All Answers
List examples of current sources?
What will happend if given Vfd out put to step up transformer
Assuming that a dedicated neutral earthing transformer is provided for each GT generator, when the two generators are running in parallel, has consideration been given that the earth fault current from one generator stator winding be split between the two neutral earthing transformers? If so, what adverse impact will this have on the operation of the 59N and 27TN devices?
Tell me all plants load factors i.e which plant operating on which load?
Why do we need a separate control desk & PLC control panel in Boiler plant or coal handling plant? Can we provide cost effective Control desk cum PLC panel. Is there is an specific need for control desk.. kindly advice.
wht is embedded systems? what is new inthis field?
In DC generator, we use commutator, having no. of segments. Then how it is possible to get a half wave of voltage and current for half rotation of armature?
What is the differentional relay...what is the work of this in power Tx. how it is works..
Which are resistive loads & which one are inductive loads : Refrigerator, Split air conditioner, ceiling fans, well pump, fluoresecent bulbs, T.V, CRT Monitors, Adsl Routers, C.P.U, Printers, Deep Freezers, Speakers, DVD Players, Microwave oven etc. ? Output Power for these Appliances Would be same like this : P = V * A * P.F Or would be changed ? thanks
we can run 2phase as 3phase .what will be the differnce with respect to phase angle, power, current between the two modes
What are the basic & Majour problems in UPS ?
why and where we use early make & late break contacts in protection?
what is Fault level? why it is calculated? how will u decide same for our plant?
What is voltage ratio of a transformer?
What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning
