High-voltage current-limiting fuse is an important protection device in power system, which can effectively limit excessive current and protect electrical equipment from overload damage. This article will introduce the principle, classification and selection considerations of high-voltage current-limiting fuses.1. Principle High-voltage current-limiting fuses are generally composed of fuses and fuse holders. The fuses are usually made of copper, silver alloys, etc., and have a certain rated current capacity. When the current exceeds this capacity, the fuse will blow and open the circuit to achieve protection. purpose of electrical equipment. The fuse holder is used to protect the stable operation of the fuse and quickly cut off the power supply after the fuse is broken.2. Classification 1. Overhead high-voltage current-limiting fuse: suitable for switch cabinets and substations in power systems, generally used to protect high-voltage switches and transformers. 2. Suspended high-voltage current-limiting fuse: the installation method is hanging, and it is often used in overhead power lines to protect the wires. 3. Leakage-type high-voltage current-limiting fuse: It is a normally closed protection device that will only fuse when the current is overloaded to protect electrical equipment from overload damage. 4. Composite high-voltage current-limiting fuse: It is a protective device with both current-limiting and circuit-breaking functions, which can protect against current overload and short-circuit.3. Matters needing attention in selection 1. Select the appropriate rated current capacity: select the appropriate fuse and fuse holder according to the rated current of the electrical equipment to be protected. 2. Selection of fuse material: Copper, copper-silver alloy and other materials have the advantages of anti-oxidation, corrosion resistance, low-temperature resistance, etc., which can improve the fault tolerance of the fuse. 3. The stability of the fuse holder: the fuse holder should have sufficient stability and strength to ensure the safety and reliability of the fuse during normal operation. 4. High flame retardant performance requirements: high-voltage current-limiting fuses often work in high temperature and high pressure environments, requiring fuses and fuse holders to have good flame retardant performance to ensure electrical equipment and personal safety. In short, the high-voltage current-limiting fuse is an important part of the electrical protection system, and it is of great significance to choose a suitable fuse and fuse holder. In practical applications, it is necessary to select the appropriate model and specification according to the actual needs to ensure the safe and reliable operation of the power equipment.
Post time: May-22-2023