Key role in power system: Ground resistance cabinet

In the modern power system, the safe operation of equipment and the safety of personnel must be taken as the primary consideration. The ground resistance cabinet is an important part closely related to the safety of the power system. It is very important equipment in the power system, its main role is to limit the ground fault current, to provide a safe and reliable grounding method for the power system. Below, we will talk about the structure, function, working principle and application of the grounding resistance cabinet, so that we can better understand the key role it plays in the power system.

Structure of the grounding resistance cabinet

The grounding resistance cabinet is generally composed of three parts: the grounding resistance, the control device and the housing. The ground resistance is the core part of the cabinet, usually made of high-resistance materials, so as to limit the fault current to run out. The control device is responsible for monitoring and controlling the operating status of the grounding resistance, and can get real-time data of the grounding resistance cabinet at any time. The shell is mainly used to protect the inside parts from the outside environment to cause damage to them, to ensure that the equipment can run stably for a long time.

The shell of the grounding resistance cabinet is generally made of corrosion-resistant materials, the oxidation resistance is very good, and it can adapt to a variety of complex environmental conditions. Moreover, the structure of the grounding resistance cabinet is arranged reasonably, and it is convenient to maintain and overhaul. Some types of grounding resistance cabinets are also equipped with cooling devices, so that when the grounding fault occurs, the temperature can be effectively controlled to avoid damage to the equipment.

What are the functions of the grounding resistance cabinet

The main function of the grounding resistance cabinet is to limit the size of the grounding fault current and reduce the grounding fault voltage, so that the safety of equipment and people can be protected. The grounding fault generally occurs when the insulation of the equipment is broken or the electrical fault occurs, at which time the current will accidentally flow into the grounding system. At this time, the grounding resistance cabinet can rely on its set resistance value to limit the fault current, so that the impact of the voltage on the power equipment can be reduced, so that the equipment is not damaged. At the same time, the grounding resistance cabinet can also effectively prevent fire and other safety hazards caused by too much grounding current.

In addition, the grounding resistance cabinet also has the function of monitoring and alarm. Once there is a problem with the grounding system, the grounding resistance cabinet can immediately send an alarm signal to remind the relevant personnel to check and maintain. This function is important to ensure the stable and reliable operation of the power system.

What is the working principle of the ground resistance cabinet

The working principle of the ground resistance cabinet is actually quite simple. When the power system is running normally, the grounding resistance cabinet is in a static state. When a ground fault occurs, the fault current flows into the grounding network through the grounding resistance cabinet. The grounding resistance cabinet limits the fault current according to its designed resistance value. According to Ohm's law, the size of the current is inversely proportional to the voltage and resistance, so as long as the appropriate grounding resistance value is selected, the grounding fault current can be effectively controlled to prevent the equipment from being too serious damage.

After a ground fault occurs, the control device in the ground resistance cabinet can detect the change in current and then initiate the appropriate protective measures. These protection measures include cutting off the fault circuit, sending alarm signals, and transmitting fault information to the power monitoring system. Through these operations, the ground resistance cabinet can respond quickly to ensure the safety of the power system.

Where is the grounding resistance cabinet used

The ground resistance cabinet is widely used in various power systems, especially in high-voltage and ultra-high-voltage power lines, and its role is more obvious. In power plants, substations and industrial users, ground resistance cabinets can effectively prevent the harm caused by ground faults and ensure the normal operation of equipment.

In power plants, the risk of ground failure is quite high due to the high voltage characteristics of generators. When used on such occasions, the ground resistance cabinet can effectively reduce the risk of damage to the power generation equipment and ensure the stable operation of the power plant. Substations also rely on ground resistance cabinets to protect equipment and maintain the safe operation of the grid.

In the place of industrial users, especially in some industries with high power requirements, such as chemical industry, metallurgy, etc., the grounding resistance cabinet also plays an important role. High voltage equipment is commonly used in these industries, and the possibility of grounding failure increases, so installing a grounding resistance cabinet can effectively reduce safety risks.

Maintenance of grounding resistance cabinet

Although the ground resistance cabinet is relatively stable when working, regular maintenance and inspection are still necessary. Users should regularly check whether the resistance value of the grounding resistance value cabinet is within the safe range, and carry out functional tests on the control device to ensure that it can accurately cope with the grounding fault. In addition, the cleaning and anti-corrosion treatment of the cabinet is also an important aspect of maintenance to ensure that it can work stably for a long time.

Technological development and trends

With the continuous development of power technology, the grounding resistance cabinet is also constantly improving. Intelligence and automation will be an important direction of the development of ground resistance cabinets in the future. By introducing the Internet of Things and big data technology, the ground resistance cabinet can achieve more efficient fault diagnosis and real-time monitoring in the future, further improving its safety and reliability.

In the future power system, the ground resistance cabinet will continue to play its indispensable role. With the emergence of new materials and new technologies, the performance of the ground resistance cabinet will be continuously optimized to cope with the increasingly complex power grid and the increasing security needs.