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What are the problems of shunt in the application of smart meters

                       
Update:25-07-2020
Summary:

The smart meter industry is one of the most widely used […]

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 the shunt has many problems that need to be solved in the meter.

Shunts usually perform current sampling on smart meter circuits. In the connection between the relay shunt and the terminal, a screw hole with a diameter of 4 to 5 mm is punched in the shunt and the terminal, and then the physical is carried out by screws and elastic single phase meter shunt 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.

60A multi-user relay

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 will 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.

In order to solve these problems of shunt connection, some smart meter engineers have adopted new methods. By using flexible steel cards to connect shunts and using voltage detection methods, they can solve the loosening problem caused by screw fixing and other performance problems. Improve the reliability of smart meters. Changing the past method of welding a relay on a shunt and then fixing it with a screw on the meter, this new method effectively solves the problem that the shunt is also prone to looseness due to transportation problems, and provides the stability and service life of the smart meter.