Interested to Buy Any Domain ? << Click Here >> for more details...
Why HRG and LRG used beside transformer, what is the purpose
- 3 Answers
- 13867 Views
- I also Faced
- E-Mail Answers
Answer Posted / kunal singh dabi
Resistance Grounding falls into two categories: Low
Resistance and High Resistance
1) In Low Resistance Grounded (LRG) Systems the current is
limited to 25 amps or more. Generally the range is from 25
to 600 amps, although in some systems it may be even
greater.
2) In High Resistance Grounded (HRG) Systems the current
is limited to 10 amps or less.
------------
A) On systems with a voltage of 1000 volts or less (phase-
to-phase) grounding resistors are not used. Normally these
system use a solidly grounded configuration with no
intentional impedance being introduced into the system.
B) Resistance Grounding is recommended on Medium Voltage
Systems from 1000 volts to 15,000 volts phase-tophase.
C) Because of the cost, Resistance Grounding is not usually
used on systems above 15,000 volts phase-to-phase.
Additionally, the use of a solidly grounded system allows
for use of equipment which is insulated for the
phase-to-neutral voltage of the system.
·D) When a system has protective relays which will trip the
circuit if a ground fault occurs, a grounding resistor with
a 10 Second Rating is often specified, because the relays
will trip the system in less than 10 seconds.However, One
Minute or Ten Minute ratings are sometimes used for an
extra margin of safety, even though the cost will be
greater.
| Is This Answer Correct ? | 5 Yes | 0 No |
Post New Answer View All Answers
Y phase plates are used in transmission line??? what is there need???
Whats the difference btwn a latch, port,data bus buffer? Do they all not hold data in d flip flops??
Write a note on Treatment for electric shock.
what are the pecularity of shaver sockets ?
how do we calculate length of starting time and repeated starting of a direct online starter?
What is the difference between line drop and percentage line drop?
If a surge divertor is required to be protected by 32 amp C Curve Circuit breaker does this limit the amount of protection from surges that you will acheive
what is th basic difference between a d latch time line and a d flip flop time line???
What is servo motor and what are different types of servo motor
how to calculate slip ring induction motor stator and rotor currents??
how to minimize earth resistance upto 2Ω, if the resistance is 6 Ω ?
Explain the function and difference of Restricted earth fault, simple earth fault and sensitive earth fault with connection diagram.
Earth bits close or open. Which is correct
What is the name of the winding from which the supply is taken for load connections?
Why computer humming sound occurred in ht transmission line?
