Articles

The Effect of Low Frequency in Weichai Generator Set

by Generator D. Diesel Generator

What is the meaning of the frequency reduction of Weichai generator and the impact on the equipment? We know that the low frequency of Weichai generator on the electrical equipment is unfavourable. Therefore, in order to maintain the rated value of the generator frequency, we need to use reasonable generator set maintenance methods to make necessary frequency adjustment. So, what impact does low frequency bring to Weichai generator?


When Weichai generator runs at low frequency, the turbine will generate mechanical vibration, and the turbine blades will be seriously damaged, which is very harmful to the turbine. Therefore, low frequency protection should be installed on large steam turbines. Low-frequency protection consists of low-frequency measuring elements and a time accumulation calculator. Because the harm of low frequency operation to the turbine is cumulative, it is related to the frequency drop value and duration.


1. The instability of the frequency of the generator system will affect the normal operation of the electronic equipment.

2. The main plant mechanical equipment of the power plant, such as fans, the amount of air and water that can be supplied will decrease rapidly when the frequency of the generator is reduced, affecting the normal operation of the boiler.

3. The decrease of the frequency causes the rotation speed of the rotor to decrease, which reduces the amount of air blown by the two fans.The consequence is  that the cooling conditions of the generator become worse and the temperature of each part increases.

4. Since the potential of Weichai generator is proportional to the frequency magnetic flux, if the frequency decreases, the magnetic flux must be increased to keep the potential constant. This will increase the excitation current, causing the temperature of the generator rotor windings to increase.

5. When the frequency decreases, in order to keep the machine voltage constant, it is necessary to increase the magnetic flux. This will easily saturate the stator core, the magnetic flux will escape, and some structural parts of the machine base will generate local high temperature, and some parts even spark.


The speed of Weichai generator motor is closely related to the system frequency. Too low Weichai generator frequency will affect the normal operation of the equipment, reduce product quality, and even cause the entire system to collapse. Therefore, in order to avoid the impact of the system frequency drop, we need to set it according to the rated frequency of the system and adjust it in time when there is a frequency change, which has an important impact on the stable operation of Weichai power generator.


Weichai Generator is a Chinese brand diesel generator. Weichai Power not only produces Weichai series power generation engines, but also produces Baudouin series generating engines. Jiangsu Starlight Electricity Equipment Co.,Ltd. is authorised as Weichai diesel generator OEM supporting manufacturer, can provide 20kw to 3000KW Weichai (Baudouin) generators, including 50Hz and 60Hz generators.



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About Generator D. Senior   Diesel Generator

101 connections, 1 recommendations, 632 honor points.
Joined APSense since, September 11th, 2017, From Jiangsu, China.

Created on Jan 15th 2020 01:28. Viewed 146 times.

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