When exciter fails alternator How does it work?
Failure of excitation that is failure of field system in the generator makes the generator run at a speed above the synchronous speed. In that situation the generator or alternator becomes an induction generator which draws magnetizing current from the system.
How do you control the excitation of a generator?
All methods use an Automatic Voltage Regulator (AVR) to supply DC output to the exciter stator. The exciter rotor AC output is rectified to a DC input for the main generator rotor….Excitation Systems
- Shunt or Self Excited.
- Excitation Boost System (EBS)
- Permanent Magnet Generator (PMG)
- Auxiliary Winding (AUX).
How does a exciter work?
In the past, the exciter was a small DC generator coupled to the same shaft as the rotor. Therefore, when the rotor rotates this exciter produces the power for the electromagnet. This output from the exiter then controls the magnetic field of the rotor to produce a constant voltage output by the generator.
Why pilot exciter is used?
A pilot exciter is a small AC generator with a permanent magnet mounted on the rotor shaft and the three-phase winding on the stator. It provides the field current of the exciter. Thus, the use of a pilot exciter makes the excitation of the main generator completely independent of external supplies.
Why excitation is required for generator?
The excitation system monitors the generator output and regulates the magnetic field to maintain the desired voltage. As the load on the generator is increased, an increase in current flow causes the voltage to drop.
Which is the best digital excitation control system?
AES-110 Digital Excitation Control System by L & S Electric, Inc. provides up to 200 amps in one compact, high performing, highly flexible, cost-effective design for synchronous motors and generators. The modular design utilizes a proven, high performance, off-the-shelf, commercially available processor and I/O module system.
Where is the exciter on a generator stub?
The doghouse area is exposed showing the exciter on a stub shaft at the end of the generator (Fig I). The collector rings in Fig J are easy to inspect with the old brush rigging removed. The positive and negative rings are separated from each other by the insulated frame in the center of the shaft.
Where does the DC flow from the exciter?
Dc flows from the exciter, through the negative brush and slip ring, to the rotor field poles. The return path to the exciter is through the positive brush and slip ring.
How many synchronous machine excitation systems have been sold?
To date, we have sold over 100 AES excitation systems on synchronous machines (gas, steam and hydro turbine units and motors) Over 30 years of experience designing, system integration, sizing, assembling, installing and commissioning of excitation systems for small to large generating units
How long do you leave ignition key on while programming?
Connect a battery charger to the battery to ensure power is available while programming. Both the BCM and PCM must be working and communicating with each other. Insert ignition key and turn to the “ON” position. Do not attempt to start the engine. Leave the key in the “ON” position for approximately 11 minutes.
How are virginize keys stored in the ECU?
The virginize keys are values that are “10” in the original dump but must be changed to “00” to tell the computer to go into auto-programming mode. The Key counter is a number count, in inverse HEX, of how many keys are currently stored in the ECU.
Can a valet key be inserted into a master key?
The first two keys are internally (inside the ECU) designated as MASTER keys and the 3rd key inserted will be internally designated as the VALET key. should stop blinking right away. If you insert a VALET key, the security light will remain solid for 2 seconds and then go out.
What to do if you lose your immobilizer key?
Insert the second transponder key into ignition lock cylinder for registration DO NOT TURN ON. The Security light may blink indicating it has accepted the key. After 3-5 seconds remove the second key from ignition. Security light should remain on indicating you’re still in programming mode. 4.