LIXISE about generator in parallel run speed instability cau
LIXISE about generator in parallel run-time speed instability causes and ruled out
Generator in parallel operation, the diesel generator oscillation, and so on and so forth, need for speed governor, diesel engine, generator, voltage regulator to take corresponding measures to improve and eliminate the oscillation.LIXISE below as an introduction to the adjustment of the generator speed of parallel, and troubleshooting methods.
(a) generator speed adjustment
The generator speedInspection work of lubricating oil.
The cause of the generator speed instability caused by most of the work is due to its too dirty, according to statistics, 80% of the failure is the reason.So, should be used at runtime to clean or carefully filtered oil.From the fuel tank of oil filling the governor oil filled the container must be completely clean, by water pollution of oil will rapidly deteriorate, produce bubbles to speed the corrosion of the internal parts.Work too dirty oil will block the movement of slide valve, piston and other parts, the impurity in the oil and dirt will block all kinds of oil and oil hole, reduce discharge coefficient.Work oil oxidation corrosion movement parts, and will increase the friction, wear, make clearance increases.These problems can be a work of governor dull, increase diesel engine to adjust torque lag phase Angle epsilon R, cause oscillations of the unit.
If the oscillation is caused by governor oil is not clear, then you can use diesel or gasoline cleaning speed governor, to rule out the fault.
Generator governor should be cleaning twice a year and replace the new oil, replacing oil cleaning should be carried out according to the instruction manual.
Generator governor drive mechanism and driving link if improper placement, clearance is too large, or wear quantity is too big, can make the regulation of generator governor dull, slow.Response to the change of rotating speed is slow, make diesel engine torque lag phase Angle adjustment.Epsilon R increases, can also cause larger oscillation.
Adjustment of the specific project and method as shown in table 1 to 9.
Table 1 a 9 generator speed instability causes and ruled out
why | Elimination method | Action principle |
1. The improper compensation adjustment | Adjustment of the needle valve and compensation pointer | Change the dynamic evenness delta R |
2. Generator governor oil dirty, oil and impurities | Let out the old oil, wash the generator speed governor, a new oil | Reduce power speed regulation lag phase Angle epsilon R |
3. The oil amount is too little, too low oil and make air into the oil of the governor | Full of oil, the oil will be the oil and stipulated in the standard.Check the oil seal, especially the drive shaft oil seal | Reduce the generator speed regulation lag phase Angle epsilon R |
4. Oil viscosity is too high | In lower degree drill oil | Reduce speed regulation lag phase Angle epsilon R |
5. Generator governor related parts wear and tear | Repair check whether governor flying piece of arm kernel hysteresis, fly block wall wear and tear on the toe is good: slide valve and valve sleeve is binding, and whether the thrust bearing wear, floating rod is flexible: if moving parts appear, scratches or spots should be polished | Improve the adjusting torque lag phase Angle epsilon R, reduce oscillations |
6. The compensation spring improper adjustment | Adjust or replace the compensation spring for generator | To improve its dynamic delta R uneven degree, reduce oscillations |
7. A bad governor spring, spring failure | Replace the spring | To improve the speed of uneven degree of the delta R |
8. Working oil pressure is too low | May be the gear pump is damaged, or oil pump check valve not everyone, needs to be repaired | Improve the lag phase Angle to print |
9. Power he lag | Check the power piston, connecting rod, rocker arm and base whether alignment with shell, check the output shaft clearance | To improve the regulation of speed governor lag phase Angle epsilon R |
10. Slide valve and oil mouth shiplap quantity is too big | Check valve and oil hole shiplap quantity, readjust | To improve the regulation of speed governor lag phase Angle epsilon R |
11. The generator adjustment throttle body and not a linear relationship between diesel engine's torque output | To adjust the relationship between generator governor and adjust the throttle body.Make it match the diesel engine's torque output | Improve regulation lag phase Angle epsilon r. and uneven degree of the delta R |
12. Adjust the throttle body (including the shaft from the generator speed please to diesel oil ring gear) between the gap is too big or binding | Check the oil body joint point of gap size, whether binding or too big.Adjust, repair or use spring to overcome all empty lines, making tiny incremental namely cause diesel engine generator governor output shaft torque changes |
Generator in parallel operation of diesel generating sets can be caused by its even organization is a lot of the reason of self-excited oscillation.In addition to the above can be on the scene to take measures to eliminate, in design still should make great efforts to make the governor with diesel engine with good.Pay attention to the following.
I, speed governor to the point of truss hinge between the high pressure fuel injection pump at least, in order to reduce friction and clearance between hinge point.
II, the installation of speed governor should be near the flywheel side, as far as possible in order to make the transmission mechanism has larger rotation uniformity.
III, the governor of the inherent oscillation frequency is higher than that of generating unit elastic vibration natural frequency, in order to avoid resonance produced large amplitude oscillations.Improve the governor can be used to improve the natural frequency of flying speed, increase the transmission ratio, or reduce flying piece of weight, and improve the elasticity of the governor drive coupling stiffness and other measures to achieve.
