The grounding resistance cabinet is an important equipment in the power system, which is mainly used to provide grounding resistance to ensure the safe and stable operation of the power system. The function of the grounding resistance cabinet is to provide a low-impedance grounding channel when a grounding fault occurs in the power system, and the fault current is quickly introduced into the ground, so as to protect equipment and personal safety. This article will introduce the principle, classification, application, selection and maintenance of grounding resistance cabinet in detail.
1. The principle of grounding resistance cabinet.
The principle of the grounding resistance cabinet is to connect a resistor with a certain resistance value between the grounding electrode and the grounding grid, so that when the grounding fault occurs, the fault current can flow into the ground through the resistor, so as to limit the size of the fault current and protect the equipment and personal safety. The resistance value of the grounding resistance cabinet is generally selected according to the rated voltage, rated current and the size of the grounding fault current of the power system.
Second, the classification of grounding resistance cabinets.
Depending on the different grounding methods and types of resistors, grounding resistor cabinets can be divided into various types. Common grounding resistance cabinets include:
1.Neutral Grounding Resistance Cabinet: Mainly used in neutral grounding system, providing neutral grounding resistance to limit the size of fault current.
2.Transformer grounding resistance cabinet: It is mainly used for the grounding protection of the transformer, providing the grounding resistance of the neutral point of the transformer to ensure the safe operation of the transformer.
3.Generator grounding resistance cabinet: It is mainly used for the grounding protection of the generator, providing the grounding resistance of the neutral point of the generator to ensure the normal operation of the generator.
4.Bus grounding resistance cabinet: It is mainly used for the grounding protection of the bus, providing the bus grounding resistance, limiting the size of the fault current, and protecting the safety of the bus equipment.
3. The application of grounding resistance cabinet.
Grounding resistance cabinets are widely used in various parts of the power system, including power plants, substations, distribution networks, etc. In power plants, grounding resistance cabinets are mainly used to protect the safe operation of important equipment such as generators and transformers; In substations, grounding resistance cabinets are mainly used to protect the safety of key equipment such as busbars and switchgear; In the distribution network, the grounding resistance cabinet is mainly used to limit the size of the fault current and protect the safety of the line and equipment.
Fourth, the selection of grounding resistance cabinet.
When choosing a grounding resistance cabinet, there are several factors that need to be considered, including the rated voltage of the power system, the rated current, the magnitude of the grounding fault current, the resistance value of the grounding resistance, etc. In addition, it is also necessary to consider the reliability, stability, service life and other factors of the grounding resistance cabinet. In the process of selection, it is necessary to conduct a comprehensive evaluation according to the actual situation and select the most suitable grounding resistance cabinet.
5. Maintenance of grounding resistance cabinet.
In order to ensure the normal operation of the grounding resistance cabinet, regular maintenance and inspection are required. Maintenance includes cleaning the surface of the equipment, checking the integrity of components such as resistors, grounding electrodes and connecting lines, and checking the operating status of the equipment. During the maintenance process, it is necessary to pay attention to safety, comply with operating procedures, and ensure the quality of maintenance.
VI. Conclusions. The grounding resistance cabinet is an important equipment in the power system, which is of great significance to ensure the safe and stable operation of the power system. When selecting, using and maintaining grounding resistance cabinets, it is necessary to fully consider the actual situation to ensure the safe, reliable and efficient operation of the equipment. At the same time, it is also necessary to strengthen the research and development of grounding resistance cabinets, continuously improve the performance and technical level of equipment, and make greater contributions to the development of power systems.