protection used for alternator , feeder , transmission line
Answers were Sorted based on User's Feedback
Answer / vinodh.t
fallowing protection are used for alternator
1.differential
2.negative phase sequence
3.over voltage
4.over current
5.thermal overload
6.under frequency
7.earth fault
8.over fluxing
9.over frequency,etc
feeder protection
1.over current
2.earth fault
transmission protection
1.over current
2.earth fault
Is This Answer Correct ? | 29 Yes | 1 No |
Protection for alternator are
Over voltage relay
under voltage relay
Earth fault relay
Over current relay
overload relay
reverse power relay
Is This Answer Correct ? | 7 Yes | 0 No |
GENERATOR:
Directional O/C & E/F,
Differential
Voltage dependant O/C
NPS
Reverse Power
Low fwd power
O/C
E/F
Standy By E/F
V/F
100 % Stator EF
Over Freq
Under Freq
Over Vtg
Under Freq
Rotor EF
TRANSMISSION SYSTEM
Distance Prot.
Local Breaker Bkp
Pole discrepancy
O/C
E/F
FEEDER PROT.
O/C
E/F
Directinal O/C & E/F
Is This Answer Correct ? | 7 Yes | 2 No |
What is the function of Harmonics filter, and how to calculate that rating of the energy saving?
How do you select a cable size(Cu & Al) for a particular load?
DIFFERENCE BETWEEN TRANSFORMER AND CURRENT TRANSFORMER?
Load break swicth maintenance procedure.
what methods are used to improve power factor?
What are hrc fuses and where it is used?
what is meant by displacement & magnitude ?
what is the function of anti pumping relays? what is KVAR? How it is generated in alternator? What is 3rd Harmonics? What is IDMT relay?
compressor compresses air means exactly what happens?
Is a contactor (or master relay) required between incoming lines and a VFD? The question goes to safety. If a contactor were used before the VFD and an e-stop engaged then the motor will coast to a stop (i.e. VFD loses power) instead of stopping much faster if the VFD braking fucntion were used. It would make more sense to keep power on the VFD.
Why and which type of tertiary winding is used in most of the power transformer?
how can I check HT cable ?