When the transformer core is stacked, what are the seam methods? What are the characteristics of each? This article starts from the popular science of iron cores, and expands and expands to check the seam method of silicon steel sheets when the transformer iron cores are stacked. (If there are any mistakes or additions, please leave a message at the end of the article)

The grounding transformer is referred to as grounding transformer for short. According to the filling medium, the grounding transformer can be divided into oil type and dry type; According to the number of phases, the grounding transformer can be divided into three-phase grounding transformer and single-phase grounding transformer. The function of the grounding transformer is to provide an artificial neutral point for the system with ungrounded neutral point, which is convenient for the use of arc suppression coil or small resistance grounding mode, so as to reduce the capacitance current to ground in case of grounding short circuit fault in the distribution network and improve the power supply reliability of the distribution system.

There are two main causes of transformer oil leakage: on the one hand, problems left over in the process of transformer design and manufacturing process; On the other hand, leakage is caused by improper installation and maintenance of transformer. The main leakage parts of the transformer often appear at the radiator interface, flat butterfly valve cap, sleeve, porcelain bottle, weld, sand hole, flange and other parts.

Gas protection is the main protection for transformer internal faults. It can act sensitively to transformer inter-turn and inter-layer short circuits, iron core faults, internal bushing faults, internal winding disconnection, insulation deterioration and oil level drop. When a fault occurs inside the oil-immersed transformer, the arc will decompose the insulating material and generate a large amount of gas, which flows from the oil tank to the oil pillow, and its intensity varies with the severity of the fault, reflecting the air flow and oil flow The action protection is called gas protection, also called gas protection. During the operation of the transformer, due to internal faults, sometimes we cannot identify and take measures in time, which is easy to cause some accidents. After the protection of the gas relay, the occurrence of similar incidents can be avoided to a certain extent.

1. What is a transformer?


In the AC circuit, the device that increases or decreases the voltage is called a transformer. The transformer can convert any value of voltage into the voltage value we need with the same frequency to meet the requirements of electric energy transmission, distribution and use.


For example, the electricity from a power plant has a low voltage level, and the voltage must be increased before it can be transported to a distant power consumption area. The power consumption area must be reduced to a suitable voltage level to supply power equipment and daily electricity. Equipment.

The power transformer is the hub of transmission and distribution of electric energy, and the core component of the power grid. Its reliable operation is not only related to the power quality of the majority of users, but also to the safety of the entire system. The reliability of a power transformer is determined by its health status, not only depends on the design and manufacture, structural materials, but also closely related to the overhaul and maintenance. The problem of improving the short-circuit resistance of transformers in power systems is discussed.