EXCITER FAULT REMEDY
EXCITER FAULT REMEDY
(OP)
i have a bit of a problem i would like to share.how do you resolve the excitation problem on a one megga volts diesel generator,the genset is unable to generate voltage due the non performance of the exciter,the exciters winding has been worked on but still cant perform






RE: EXCITER FAULT REMEDY
Muthu
www.edison.co.in
RE: EXCITER FAULT REMEDY
Check the AVR.
Disconnect the rotating diodes and surge suppressor(s).
Do megger and continuity checks on the exciter stator winding, the exciter rotating winding, and the main field winding.
Change the rotating diodes and surge suppressor(s).
Check output using an automotive battery to supply excitation. You may wish to fit a discharge diode to the field to make disconnecting the battery safer
If this is a PMG machine, check the output of the PMG. Expect to find 200V to 300V, AC.
Bill
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"Why not the best?"
Jimmy Carter
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
1. Wrong direction of rotation.
2. Loss of residual magnetism.
3. The field winding resistance (with regulating resistance in series) exceeding the critical resistance.
4. Underspeed.
Muthu
www.edison.co.in
RE: EXCITER FAULT REMEDY
Verify that DC exciter itself is wired correctly, especially the polarities of field windings. Test actual leads and winding continuities, they could have been landed on wrong terminals.
Rafiq Bulsara
http://www.srengineersct.com
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
How is the voltage controlled?
Do you have an Automatic Voltage Regulator (AVR) or does the set use current transformers, diodes and resistors to control the exciter?
We should know this before giving more suggestions.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
If not, disconnect the exciter from the generator and connect the battery to the main generator field.
It is good practice to connect a discharge diode across the fields before connecting the battery. The diode will provide a discharge path and avoid high voltage pulses which are dangerous to both people and machines.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
RE: EXCITER FAULT REMEDY
Rafiq Bulsara
http://www.srengineersct.com
RE: EXCITER FAULT REMEDY
However, regulator problems may be the cause of the exciter failing to produce. Hence the battery in place of the regulator.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: EXCITER FAULT REMEDY
Muthu
www.edison.co.in