Key Points and Maintenance Methods of Low Noise Generator Set

Today, we will briefly introduce the key points and maintenance methods of low-noise generator sets.

There are differences between voltage regulation and frequency regulation: in a system, the frequency value is the same regardless of region, and the balance of active power is also the power balance of the whole system; The voltage level is inconsistent in different power consumption areas. Reactive power balance is mainly in different areas. The power plant's ability to regulate voltage can only be within a small area around it.

Multiple generator units operate in parallel. When one unit is regulated by the above method, the effect on system frequency and voltage is not significant. Its main purpose is to regulate the load distribution between units. Especially for small units in large systems, the output size will not have a substantial impact on voltage and frequency. The low nise generator can be regulated according to needs, so the regulation of small generator units in grid-connected operation is much simpler.

When maintaining the active output of the generator unit unchanged, changing the excitation can change the reactive output and power factor of the generator unit; When the excitation current is kept constant, the reactive output of the generator set will be reduced by increasing the active output. If it is not reduced, it must be increased correspondingly when the excitation system operates at low power factor, which will increase the burden of the excitation system. In order to not exceed the excitation current at full load rated condition, the output of the generator set (kW and kVA) should be limited in order to ensure the stable operation of the generator set and maintain a certain stability margin between parallel motors, The excitation of the generator unit shall be controlled to avoid leading phase operation. The excitation current shall not be reduced too small, and measures shall be taken to prevent loss of excitation.

The excitation system not only plays a very important role in the operation of the generator set, but also is the weakest part and the highest failure rate of the generator set structurally. Therefore, in order to ensure the safety of power generation, it is necessary to pay enough attention to the excitation system and conduct necessary inspection after shutdown and before startup, especially for the brush device of the coaxial exciter, and to check the technical conditions of the brush, brush holder and commutator surface, Purging shall also be carried out if necessary; During operation, it is necessary to check whether the electric brush is burning and jumping; Strengthening the inspection, repair and maintenance of the excitation system is one of the important means to prevent the generator unit from failure.

Another feature of the standby generator set is that it "raises soldiers for thousands of days and uses them for one day". Therefore, when it is not in use, it is likely to get damp. The most active preventive measure is to ask the manufacturer to conduct moisture-proof treatment on the winding insulation. If the internal temperature of the generator set can be 5-10C higher than the ambient temperature on the site, it is an effective moisture-proof method. If it is damp and the insulation is unqualified, it is not allowed to apply voltage to the motor and it must be dried first, It is also a common method to implement the regular commissioning system of generator units to ensure that the units are in good condition.

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