Cause and treatment of over voltage for small diesel generator set:

1. reason: excessive speed. Handling: reduces the opening of the hydrofoil and reduces the speed of the turbine.

2. reason: the gap of shunt reactor core is too large. Handle: change the thickness of reactor core gasket, adjust air gap.

3. reasons: magnetic field rheostat short circuit; voltage regulation failure. Handling: finding short circuit points and eliminating them.

4. reason: generator accident speed. Handling: emergency shutdown for incident handling.

Causes and treatment of low voltage of small diesel generator set:

1, the prime mover speed is too low. Handling: adjust the speed of the prime mover to the rated value.

2 、 the excitation circuit resistance is too large. Processing: reduce the resistance of the magnetic field rheostat to increase the exciting current. For the semiconductor excitation generator, the additional winding shall be checked whether the connector is broken or wrongly connected.

3 、 excitation motor brush is not in neutral position, handle: or spring pressure is too small. Switch the brush to the correct position, change the brush and adjust the spring pressure.

4 、 some rectifier diodes are breakdown. Handling: check and replace the breakdown diode.

5 、 short circuit or ground fault in stator winding or excitation winding. Handling: checking faults and removing them.

6, brush contact surface is too small, lack of pressure, poor contact. Processing: If due to the commutator surface not only can be caused, at low speed, the surface of the commutator polished with emery cloth, or adjust the spring pressure.