The Influence of Diesel Generator Set Operation Loss of Excitation

Loss of excitation has adverse effects on the generator and power system of Cummins diesel generator sets. When determining whether Cummins diesel generator sets can allow loss of excitation operation, these effects should be considered. The impact of loss of excitation operation on Cummins diesel generator sets is as follows:

Severe reactive power shortage causes a decrease in system voltage. After the loss of excitation of the Cummins diesel generator set, it not only cannot transmit reactive power to the system, but also absorbs reactive power from the system, causing a serious shortage of reactive power in the system. If the reactive power supply of the system cannot provide this additional reactive power, the system voltage will significantly decrease. The decrease in voltage not only affects the safe operation of the auxiliary power supply for the excitation loss unit, but also may cause overcurrent in other units. More serious is the voltage drop, which reduces the power limit of other units, may disrupt the stability of the system, and may also cause system collapse due to voltage collapse.

The impact on the loss of excitation unit. When the Cummins diesel generator set loses excitation, the stator current increases, causing the temperature of the stator winding to increase; Loss of excitation operation is an extreme situation in the leading phase operation of Cummins diesel generator sets, and leading phase operation will increase the leakage of magnetic flux at the end of the machine, resulting in the heating of the end iron core and components due to increased losses and an increase in temperature; Due to demagnetization operation, differential frequency AC current is induced in the rotor body, causing losses and heating. In certain parts, such as between the slot wedge and the tooth wall, or at the overlap between the retaining ring and the body, losses may cause local overheating of the rotor; The pulsating torque generated by the electromagnetic asymmetry of the rotor will cause vibration of the Cummins diesel generator set and foundation.

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