1. The principle of exhaust arrester
The exhaust arrester is an electrical device that works on the principle of flashover discharge. They are usually installed on facilities such as high-voltage transmission lines or substations to protect these facilities from lightning damage.
The working principle of the exhaust arrester is that when lightning strikes the device, it will form a high electric field strength at the lead wire of the device. If the electric field strength exceeds the breakdown electric field strength of the air medium, the air medium will discharge. A short-circuit path is formed, thereby directing lightning into the ground. The exhaust arrester plays a role in this process. It uses the electrical properties of the metal oxide resistor (MOV). When maintaining the normal working voltage, the resistance is very large and consumes almost no power. However, under the impact of lightning, The resistance drops dramatically, sending a large amount of current into the ground line, which induces lightning into the ground.
2, the principle of the exhaust arrester to protect the transformer
The reason why the vented arrester can be used to protect the transformer is that it can prevent the transformer from generating overvoltage due to lightning strikes. In the power system, the transformer is a very important device, which is responsible for converting high-voltage electric energy into low-voltage electric energy to meet the needs of industrial and domestic electricity. However, when struck by lightning, due to the huge instantaneous energy of lightning, it is easy to bring overvoltage to the transformer, thereby causing serious damage to the insulation and internal components of the transformer.
The principle that the vented arrester can protect the transformer is to install a vented arrester next to the transformer. When lightning strikes, the arrester can absorb and release the overvoltage and introduce it to the ground, thereby protecting the transformer from damage. The work of the vented surge arrester can be compared to a "discharge valve", which can discharge the overvoltage when necessary, so as to protect the safe operation of the transformer.
3. Application scenarios of exhaust arrester
Vented surge arresters are widely used in various high-voltage power equipment, such as transformers, switchgear, power distribution equipment, transmission lines, etc. In the power system, the exhaust arrester is regarded as an important equipment, which can protect the stable operation of the power system and improve the reliability and safety of the power system.
In short, the vented surge arrester can protect the transformer from lightning damage. It uses the electrical properties of the metal oxide resistor (MOV) to introduce a large amount of current into the grounding line when it is subjected to lightning strikes to protect the safe operation of the transformer. It is widely used in power systems and is a very important electrical device.