Interested to Buy Any Domain ? << Click Here >> for more details...
what is the difference between earthed system and unearthed
system.. where do we use unearthed system because in
electrical catalogues always cable for earthed and unearthed
system is given..pls elaborate
- 3 Answers
- 37739 Views
- I also Faced
- E-Mail Answers
Answer Posted / bikash chandra pal
WAHT IS EARTHED SYSTEM??
when the source(it may be feeding generator neutral point
or feeding transforme neutral or a bus through a zig-zag
transformer etc)neutral point of a perticular voltage level
of a system is earthed(may be solidly or through a
resistance/inductance), then that perticular voltage level
of the system is called as earthed system.
WAHT IS UNEARTHED SYSTEM??
When the above said neutral point is not earthed then that
perticular voltage level of the system is called as
unearthed system.
ADVANTAGES OF EARTHED SYSTEM
The system eathing(solidly or through a resistance or
impedance) is done to provide a returne path of earth fault
current, which in turne helps
1)To isolate the faulty part of the system due to earth
fault by sensing earth fault current.
2)To Reduce the insulation requirement of phase elements of
equipments connected in that voltage level & cost of the
equipment/s in turn. VIZ: Earthed grade cables are less
costlier than unearthed grade cables.
3)Fenomennon like ARCHING GROUND can be avoided.
So,
System with lesser Equipment cost(refer SL.NO.(2)above),
health of the concern part of the system(Refer sl no.(1) &
(3)above) remain protected.
DISADVANTAGES OF EARTHED SYSTEM
Possibility of interruption of power supply due to earth
fault,is more in EARTHED SYSTEM than UNEARTHED SYSTEM.
ADVANTAGES OF UNEARTHED SYSTEM
1)Possibility of continuation of power supply is more in
UNEARTHED SYSTEM, as tripping of system due to first earth
fault is not happens.
2)sensing of presence of earth fault through sensing of
concern system's neutral displacement is possible & planned
maintenance/earth fault clearence of the system is
possible,which supports better availity of the system &
lesser interruption of process.
DISADVANTAGES OF UNEARTHED SYSTEM
1)Isolation of the faulty part of the system due to earth
fault by sensing earth fault current is not possibele due
to first earth fault.
2)Insulation requirement of phase elements of equipments
connected is higher Hence cost of the equipment/s is
higher. VIZ: unearthed grade cables are costlier than
earthed grade cables.
3)Fenomennon like ARCHING GROUND is there.
So,
Capital investment is higher for unearthed System, But
availability of system is better.
| Is This Answer Correct ? | 41 Yes | 1 No |
Post New Answer View All Answers
What are the uses of stepper motor?
What is meant by turbo alternators?
How npn and pnp transistor works
Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...
Two liquids hot and cold in two vessels are there and an metal bar acts as a conductor of heat between the two vessels. what happens then. what happens after 24 hrs?
How does the phase sequence controller works, how it identifies the phases? confirm working principle
what is the meaning of number in (11, 31, 61,14, etc. CDG11, CDG31, CDG61, DDT32
why are distributed windings generally used in alternators?
what are the accessories need to be added while doing estimation for the following: 1.MCCB 2.MCB 3.ACB
What is CVT and what is relation with wave trap?
11KV AND 22KV NETWORK KW CAPACITY IN RING AND RADIAL?
Thumb rule of cable size(rm>30 rm)X multiplying factor=ampere
why you don not show protection and type of isolation in key single line diagram?
EXPLAIN THE WORKING OF SERIES REACTOR IN HT CAPACITOR BANKS (FOR VOLTAGES & CURRENTS)
How to check the Bushings of the transformer?
