What are the problems with shunts in smart meter applications

The smart meter industry is one of the most widely used shunts, and there are different types of shunts on each smart meter. The shunt is usually installed in a smart meter with a screw hole design. It is precisely because of this design that there are many problems that need to be solved in the shunt in the meter.

Shunts usually perform current sampling on smart meter circuits. In the connection between the relay shunt and the single phase meter shunt, a screw hole with a diameter of 4 to 5 mm is drilled in the shunt and the terminal, and then the physical is carried out by screws and elastic metal washers. link. Due to the existence of perforations, the current cross-sectional area of ​​the shunt metal conductor will decrease, the internal conductivity will inevitably decrease, and the resistance will increase.

In addition, even though the screws and gaskets used to connect the shunt are made of metal materials, due to their different metal materials, it is difficult to ensure good electrical conductivity; and during the transportation of the smart meter, due to road bumps and vibrations, etc. , The screw contact is likely to become loose. After loosening, the shunt and the terminal become a bad contact. These reasons will cause the resistance of the connection to increase. These factors are some of the problems that shunts need to solve in smart meters.