The working principle of surge protection devicesSurge Protective Devices (SPDs) are important safety devices primarily designed to protect electrical and electronic equipment from the effects of voltage spikes and surges. Here's how they work:1. Surge protectors in normal working conditionIn normal working conditions, surge protectors present high impedance to normal power frequency voltages, with almost no current flowing through them, equivalent to an open circuit. This means that surge prote

Whether DC grounding points and AC grounding points can be shared depends on the specific system design, safety standards, and regulations. Here are some key points to help you understand this issue:1. Safety Standards and RegulationsNational Standards: Different countries and regions have different electrical safety standards and regulations. For example, China's national standard GB/T 16895 and the United States' National Electrical Code (NEC) provide detailed guidelines for grounding in both

In lightning protection systems, the selection of conductive materials and types for connecting air terminals (lightning rods) is very important. Using copper PVC cable to connect to air terminals is not the best choice, and the main reasons are as follows:1. Conductivity Copper Wire: Copper is an excellent conductor and can effectively carry lightning current. PVC Insulation Layer: The PVC insulation layer may melt or burn due to high temperatures during a lightning strike, affecting conductivi

Differences between Copper Rod and Copper Plate Grounding ElectrodesThe main difference between copper rods and copper plates when used as grounding electrodes lies in their shape and application scenarios.Shape and StructureCopper Rod: A copper rod is a round metal bar that usually has a certain length and diameter. This shape makes it suitable for use in situations where it needs to be inserted into the soil, such as the grounding rod in lightning protection grounding systems. The advantage of

Transformers are critical components in power systems. To ensure their safe and reliable operation, they are typically equipped with various protection systems. These systems can detect and respond to different types of faults and abnormal conditions, promptly cutting off the power supply to prevent the fault from escalating. Below are some common transformer protection systems:1. Overcurrent Protection1.1 Instantaneous Overcurrent Protection Function: Detects and rapidly responds to short-circu

The impact of electrical grounding on lightningElectrical grounding plays a crucial role in lightning protection systems. Here are specific ways in which electrical grounding affects lightning:1.Provide a current pathElectrical grounding provides a low-impedance path for lightning current to quickly and safely flow into the earth, preventing the accumulation of lightning energy within equipment or buildings from causing damage.2.Reduce VoltageThe grounding system helps to reduce the instantaneou

Fuses may blow even in the absence of an apparent load, and this is usually caused by one or more of the following reasons: Short Circuit: This is one of the most common reasons. When the positive and negative terminals in a circuit come into direct contact, it creates a massive current that causes the fuse to immediately melt. Short circuits can be caused by worn-out wiring, dampness, or foreign objects intruding. Fuse Quality Issue: Using low-quality or inappropriate fuses can also lead to fre

The process of a lightning rod attracting lightning mainly relies on its unique design and physical principles. Here are the specific steps of how a lightning rod attracts lightning: Electrostatic Induction: When thunderclouds approach the ground, they induce electrostatic charges in objects on the ground. This means that opposite charges are induced in objects on the ground due to the presence of charges within the thundercloud. Since lightning rods are typically taller than surrounding buildin

The reason for using fuses on the low-voltage side of large power systemsProtect Circuit SafetyThe main function of a fuse in a circuit is to protect the safety of the circuit. When there is a fault or abnormality in the circuit, such as overloading or short circuit, the current will increase sharply. In this case, the fuse will automatically fuse and cut off the current, thus preventing damage to the devices in the circuit and avoiding the occurrence of safety accidents such as fire.Overload Pr

A surge protector for direct current (DC) systems is primarily used to protect equipment within DC electrical systems from damage caused by voltage transients (surges or spikes). Here are some of the main purposes of a DC surge protector:1.Protect Equipment (Protect Equipment) Sensitive Electronic Devices: Many modern devices, especially those containing microprocessors or integrated circuits, are particularly sensitive to voltage fluctuations. A DC surge protector can prevent voltage transients