what is excitation system explain in detail with its
working?
- 1 Answers
- 7478 Views
- Toshiba, I also Faced
- E-Mail Answers
Answer Posted / mike
1) A.C. excitation.
This type of the exciter operated with a.c. supply and rated frequency around 50 until 250 Hz.The output provide with slip ring to be rectified for internal mounted diode cubicles.This types can replaced for commutator on the d.c with solid state rectifier.
The output from rectifier supply to the generator rotor with slip ring for the d.c excitation system. Usually a pilot exciter made from a permanent magnet for supply to main exciter.
For the main exciter,it commonly made in three phase used the combination of diode in a bridge formation.The bridge arm have a several piece of diodes in parallel condition.
The method for short circuit protection is each diode individually fused to remove it from the electrical circuit in when it happen.
2) Brushless excitation.
This excitation system have a similar function between A.C excitation with advance application.The rectifier diode installed on the exciter shaft.The main exciter has its output armature winding on the rotor with its field on the stator.
Normally for rotor output frequency rated around 100 and 250 Hz and it is connected to the shaft mounted diodes.The rotor of main generator can supply the output with directly application.
The pilot exciter can be a permanent magnet generator with frequency operation until 400 Hz.For the small generator,supply can provide from generator terminal to the exciter field.
3) Thyristor excitation.
For this type of excitation system it used thyristor rectifier to directly control the generator filed current and it can response with faster system by controlling the exciter field current.Thyristor excitation fed system is necessary to provide slip rings and brushes to connect to the machine rotor.
This function is important to alert and response to the error or faulty for system stability due to critical application.But it have disadvantage because this system not been developed commercially and not common system for generator at around the world.It also difficult to providing the reliably control signals to them from stationary equipment.
Excitation power may be provided with direct application to the coupled main and pilot exciters or it can fed from main generator terminals using a step down transformer.
Normally the transformer ratio is design to provide full output during the occurrence of a system fault and it reduces the machine terminal voltage for protection system.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
What happens when ac supply is given as excitation voltage instead of dc supply
To prove the capacity of a 10MVA transforemr with 6.5% impedance by a short circuit test how much power is needed to inject an impedance voltage if we have to arrive for its rated current?
how to read idmt curva
What conditions are required for transformer to operate at low frequencies ?
What are the protection required for Transformer, motor, Line, Generator, capacitor, that all i have to refer which standard?(Like Transformer detail IS 2026)
What happens if the negative to earth voltage is greater than positive to earth voltage in the battery of substation?
WHAT IS MOBILE SUB-STATION? & REALLY BENEFIT IN INDIA
AL=0B9H,bl=75H, ADD AL,BL AL=____________? CF________? OF___________?
How to calculate the External Resistance required for 60HP slipring motor in case no any data of the Motor is available???
Define gain margin?
In control room of our one plant there is a continuously the incoming power goes to PC is vary,means in stabilizer it continuously indicate from high input to low and low input to high. what is the reason and its solution.
Hi Friend I am used multimeter to measure the voltage between R Phase(SS1) to R Phase(SS2). In SS1 is connected with UPS loads. But I am getting voltage between these 2 R Phases. Please give some idea friend
Instrument connected to a single phase supply
Good morning: I'm looking for some informations about the OLTC or the LTC: I wont to know what the function of the tie-resistor in during the operation of reversing/coarse operation Cordially
What is the tipical Online UPS input voltage for 20 KVA load ( 3 Phase or 1 Phase )? Why ? Explain it...?
