Answer Posted / pallisseri narayanan
During any fault in an electrical system, voltage and
frequency will reduce and the generating station will try
to recover through Auotmatic Voltage regulation system and
Speed Governor control. The system disturbance depends upon
the magnitude of fault, area where the fault is occured and
the time taken to trip through protection relays. In the
meantime if we can throw out some non critical loads the
recovery and system normalisation will be fast and the
remaining loads will be on safe. Hence we provide load
shedding arrangement through a frequency relay with
different stages of frequency setting. Non critical loads
will connect to the first stage ( for example if the normal
frequency is 50 HZ the first stage setting can be 49.8HZ,
2nd stage 49.5, third stage 49.2 etc;) then the next
prioriy of loads to 2nd stage and the next to 3rd stage.
The settings are done as per the electrical system study.
| Is This Answer Correct ? | 5 Yes | 1 No |
Post New Answer View All Answers
how to calculate the magnetizing current of ct ( 800A/1A) for Relay 64
Dear sir, I have completed DECE in the year 1995. I have work experience in HT and LT LINE more than five years. Now i am doing BE in EEE from rajasthan university. After completion of BE,can i apply "C" Licence sir? Please reply.
why industry prefer ht motor instead of lt motor.
why d.c produces corrosion
What is the permissible limit of shaft voltage for 6.6 KV motors ? Why? Is there any standard is available?
Distribution transformer we provided 2 separate earthing pit for Body and 2 separate earthing pit for neutral,we can not connect separate body earthing pit to other earthing pit but we do metal glanding in secondary side cable termination in both side, transformer and PCC panel (LT Panel), is this safe for transformer and other equipment?
Difference between on line capacitor and Station type capacitor
what is the prosses for getting of 33kv licence (i have completed my engineering degree & working in 33kv substation for contract basis )????
How we can calculate the life of Lead acid battery
What are all present producing cost of Per KWH of various Fuel?
What is an ac motor?
What is meant by impedance? difference between high & low impedance ?
How much kv gas generator is needed to run 2 hp and 1 hp airconditioners, plus a refrigerator and 4 Tvs
Lt motor sfu flashing reasons?
Has someone here done a sizing for a generator (3 phase), its for a pumping station. If you have an example for standby/duty and both running (I) star delta (ii) Soft Starter.
