What Are The New Sensors For Power Fittings?

What are the new types of Energy power meter sensors?
Traditional current and voltage transformers are iron core transformers, which have inherent weaknesses and limitations, such as small range, low accuracy, heavy weight, and a certain degree of insecurity. In the late 20th century, new sensors were developed to replace traditional transformers (1) Current transformers: New current transformers mainly include AC coils and optical current sensors. Optical current sensors have basically the same advantages as AC coils, but the most important advantages are large dynamic range, good performance, small size, no open circuit problem, and low cost.
The principle of the current sensor is to apply the Faraday effect, that is, the polarization plane of a beam of linearly polarized light can be deflected under the action of an external magnetic field, and its optical rotation has a fixed functional relationship with the magnetic field strength.

(2) Voltage sensor: The response characteristics of conventional voltage transformers are poor, and as the measured voltage increases, the volume of the voltage divider increases accordingly, and the response characteristics become worse.
The new photoelectric voltage sensor is made of an electro-optical crystal using the principle of the pockels electro-optical effect. The advantages of voltage sensors are: large dynamic range, good performance, fast response speed, can adapt to the requirements of electronic measurement, protection and control and can be combined together, small size, light weight, easy to install, high reliability and electromagnetic compatibility, good safety. Photoelectric voltage sensors have been widely used in the 21st century.