Causes of Bus Faults in Medium and Low Voltage Systems

Arc discharge combustion indicates a fault in the medium and low voltage bus. The energy released by the medium and low voltage bus is enormous. When it malfunctions, the arc light generated will instantly increase the pressure and temperature. After the arc is formed, the air in contact with it will be immediately ionized, resulting in explosive pressure and high temperature with extremely high energy. If these huge energies are not cut off in time, it will cause varying degrees of damage to equipment and personnel. However, there are many reasons for this type of failure to occur in medium and low voltage switchgear.

2.1 Poor equipment quality

Without a scientific and reasonable design of the structure of the switchgear, if the switchgear is too large or too small, coupled with inadequate manufacturing quality, it can lead to aging of the insulation and wear of mechanical equipment when officially put into use, resulting in a decrease in its insulation level. In terms of equipment quality, it is necessary to lay a good foundation for future use. If the quality is not satisfactory, it will lead to subsequent problems.

2.2 Inadequate operation and maintenance

In terms of operation and maintenance, it is also extremely important. The environment in which it is used is related to the stability and security of the system. If operated in harsh environments such as high temperature, humidity, chemical erosion, etc., the insulation materials used are prone to damage and shorten their lifespan. On the surface of the insulation, varying degrees of damage may occur, leading to insulation failures and ultimately resulting in short circuits in the medium and low voltage busbar system.

2.3 Improper maintenance and operation

The maintenance and repair of power plants play a crucial role in the entire system, and some people attach great importance to this work, often resulting in faults due to improper operation. For example, during maintenance, one accidentally leaves their tools in the switchgear, forgets to measure and record the voltage in their work area, etc. These typical improper operations can cause faults in the medium and low voltage system busbars, leading to larger problems.

2.4 Others

In addition to the above factors, there are also some faults caused by the carelessness of the staff, such as the switchgear not being properly sealed, and some small animals sneaking in and biting the insulation, resulting in faults in the medium and low voltage system busbar. In addition, with the rapid development of the power system, the structure of the power grid is constantly changing, leading to an increase in electricity consumption, resulting in an increase in cables and overload of electricity, which is also where faults occur.

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