Does the Electrical Current Transformer exert a lot of force on the neutral line?

The working principle of the Electrical Current Transformer is the same as that of the ordinary Electrical Current Transformer that people use, but its accuracy and error requirements are particularly high, and its measurement error does not exceed ±1%. Generally, it is not sold in the home appliance market. This is a method of monitoring large and medium-sized enterprises and electricity users in real time to adapt to smart grids and smart end devices. Due to the large load of large and medium-sized users, a "neutral Electrical Current Transformer" is installed in the neutral bus of the low-voltage switchboard to detect the current flowing through the neutral of the three-phase load. The current signal is sent to a dedicated power measurement chip for data analysis and statistics.

At the same time, the voltage is also sent to the energy measurement chip. The microprocessor performs data processing and uses operator communications for timely feedback to the utility company's servers. This smart metering device uses a microprocessor and a chip dedicated to power metering. It has the characteristics of complete functions and high measurement accuracy. For single-phase 220V users, current smart meters already have a "neutral Electrical Current Transformer" installed in their internal structure. In order to improve the technical protection capability of the smart meter, when the power input and output phase lines are short-circuited, it can detect the current flowing in the neutral loop of the meter.

In addition, the State Grid clearly states in the technical specification that all smart meters need to have the function of measuring and recording the neutral point Electrical Current Transformer. In electrical engineering, it is pointed out that for single-phase loads (that is, phase and neutral), the current flowing into the phase and the current flowing out of the neutral are the same. The Electrical Current Transformer is used to perform current sampling, which is then sent to a microprocessor for data comparison and analysis. By comparing the current imbalance between the phase and neutral conductors, the usage status or operating conditions of the smart meter (if necessary) can remotely control the tripping of the load switch in the meter.