what is GRR(Grid Rotot resistance)?Why it is used beside of
LRS?
Answer Posted / rupesh usadadiya
GRS= Grid resistance STARTER
GRR= Grid resistance REGULATOR
While:LRS = Liquid Resistance STARTER
& LRR = Liquid Resistance REGULATOR
Both GRR & LRR or GRS & GRS are technically similar.
In both the equipment we are adding the resistance in the
rotor circuit.
BUT THE MAJOR DIFFERENCES ARE:
GRR a solid form of resistance, While LRR is Liquid form of
Resistance.
In GRR onece you define the resistance value, we can not
change the resistance value without changing the hardware.
While in LRR we can change the resistance value by changing
the Liquid concentration(PH).
In Regulators, the resistance is continue in circuit, hence
the temperature of resistance increase.
In solid resistance its possible to withstand the high
temperature without major changes in resitance value, while
in Liquid Resistance if temp. goes above 90 degree C, the
resistance value is change drastically.
Hence the Grid(Solid) resistance mainly used in speed
regulators.
If we want to use the Liquid Resistance as a controller,
then we need to add a heat exchange or cooling system to
maintain the Liquid temperature.
Any one can find out the more details on GRS/GRR and LRS/LRR
on www.resistancestarter.com or www.pew-india.in
Is This Answer Correct ? | 42 Yes | 4 No |
Post New Answer View All Answers
Differentiate between low pass, high pass and band pass filter?
difference between semiconductor & conductor & insulator?
Explain in details how you would react to an unexpected incident when your supervisor or manager is not around to give instructions?
Is it true online ups having bypass mode if it is true then why we called ups because it is interrupting power when goes in bypass mode
why all the feeders are designed in a particular manner ... is there any reason for that???
What is the differance between 2 dc motors of armature voltage 660 v and 440 v?
Anybody know how schematic diagram for reverse power relay? RPR for generator protection
Mention what are the types of semi-conductors?
What is the difference between Droop vs Isoch Control?
How PADO software increase the efficiency of power plant?
how define the torque in ac drive. from electrical side in the drive friquency ,voltage and current three factor is there.
What is phase cross over frequency?
hi plz send me reliance placement papers..i.e electrical technical papers that have been asked in reliance test.
what would u consider to be the basic purchase order information you would need to proceed with a cable inspection assignment?
I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?