Interested to Buy Any Domain ? << Click Here >> for more details...
what is the use of neutral displacement relay
- 1 Answers
- 28533 Views
- OCL, I also Faced
- E-Mail Answers
Answer Posted / loboreliance2003
The relay comprises an attracted armature element fed via a
rectifier and series resistor. It can be provided with
either a fixed
setting, or variable settings using a plug bridge. It has a
minimum
withstand of rated voltage continuously.
Operation of Neutral Voltage Displacement Relays
The zero sequence current that flows for an earth-fault on
an un-earthed network is determined by the capacitance of
the cable to earth. This flow of current leads to a rise in
the voltage of the neutral point of the incoming supply
(the star-point of either the generator or transformer). It
is this rise that is detected by a neutral voltage
displacement relay. If the network is quite small (i.e.
short cables), then the zero-sequence voltage will be
unstable. This is why an instantaneous relay is only
generally used to provide an alarm. In the event of a
fault, neutral voltage protection cannot detect the
location of a fault, so all sources of supply should be
disconnected.
| Is This Answer Correct ? | 10 Yes | 9 No |
Post New Answer View All Answers
For the requirement of a furnace of temperature range up to 1200 oC using silicon carbide rods, What is the required rate of transformer needed (please do it with all details)?
how to prepare the technical test
Grid fault level [KA]?
During Starter Panel Com missing I Found The Main Incomer 40Amp MCB 10KA Trip When Motor Change Star To Delta Motor Rating 20HP BUT When We Use Same MCB To Other Motor It Does Not trip Or What Is Necessaries for Star Delta Starter MCB SFU MPCB OR MCCB And What are The Breaking Capacity of MCCB in the Motor above 15HP
What is the difference between hot and cold loop testing?
can anyone explain 11kV 3core cable megger,hi pot test procedure with connection details?
How to calculate the value of earth capacitance in a transmission line.
What is EHT tariff or Power factor Tariff ????
what about the power of wattmeter at starting and loding?
Please explain, how to test vector group of tranformer(Delta y1) . Thank
can we do the star delta connection of capacitor for 3- phase motor starter.
Dear sir, I completed DECE In the year 1995.Now i am working in a private company from last 10 years as an Electrical supervisor.The company having a 1000 KVA transformer.Now i try to apply "C" Licence. I am eligible or not.If not eligible,pls give solution.
The size and construction of bushings in a transformer depend upon?
What's the difference between non break power supply and non break non short break power supply
how is positive, negative, zero sequence is happen.. how is effect on 3 phase system
