Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / venkatesh kulkarni
Used to limit the ground fault current.
If the Line voltage getting leakage or shorted with ground
then fault curretn will flow.
If it is High voltage system this fault current will be
very high (KAmps). So this much high value fault current
will demage the fault current sensing devices (relays).
This fault current will reach the transformer Neutral
through the Neutral earth pits.
By adding the NGR in between the Transformer neutral and
Neutral earth pit, resistance of the fault current path
getting increase.
we Know that, If resistance is more then the (fault) current
flow will be less.Then easy to sence. Normally resistance
will be 12 to 15 ohms depends upon the setting made at
relays.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
What is online and offline ups? how does it works?
what is cathodic protaction?
why the perameters of secondary circuit are more important then that of the primary circuit of induction motor?
What is principle of Floroscent tube 36watt.
what is the carona effects meaning in HT line transmmission system
how did i get the competency certificate as electricle supervisor. iam completed my b.tech.but i dnt have any experince, this certificate is required for applyng ongc mangement trainees. what should i do sir please suggested me
What is the difference between voltages or potential difference? And what are they?
As we use capacitor bank in 3ph ckt to improve PF, can we use capacitor in single ph domestric use, in house we have Fan,Mixer,electric cooker,iron,tube choke they also lag the system,because it is inductive load. if it is possible to improve PF of single ph system-- if yes- type of capacitor to be used,connection diagram, working in detail. if no-- list it.
Explain the term parallel path in dc machin ?
How to calculate energy stored in a capacitance
wish of these transformer uses oil?
what is cascade speed control device?and how this device control the speed of motors?
What is the difference between Generator Differential Relay and Transformer Differential Relay?
State superposition theorem?
bus bar design conditions and sizing pls tell me quickly
