Current transformers (also known as current transformers) use the principle of electromagnetic induction, which is the principle of generating an electric field by changing the magnetic field. When two coils are wound around the same iron core, the secondary winding is induced by the primary winding

This group is directly proportional to the current or electric current. Therefore, it is also known as the mutual inductance principle or transformer principle.

Hall sensors are made of the Hall effect. When a conductor passes a current perpendicular to the external magnetic field, it is perpendicular to the direction of the conductor's magnetic field and current

There is a potential difference in the straight direction. The potential difference is directly proportional to the magnetic induction intensity and the current of the external magnetic field, and the magnitude of the current, potential difference, and external magnetic field are fixed

Magnetic induction intensity is the yield ratio. By using a primary coil to generate an external magnetic field, the potential difference and primary current are the yield ratio, which is the principle of Hall sensors. From application

The commonality between them is that they require a primary coil to generate a magnetic field.

One difference is that transformers require a change in magnetic field, while Hall sensors can have a constant magnetic field, so the former can only be used for AC testing, while the latter can be used for AC testing

Can be used for both AC and DC testing.

The difference is that transformers have iron cores, while Hall sensors do not have iron cores. The former is nonlinear in frequency, while the latter is linear, so the former does not have an iron core

The applicable frequency band is relatively narrow, usually used for fixed frequency bands (such as 45 Hz and 66 Hz), while the latter frequency band is relatively wider.

The third difference is that transformers are more commonly used for measuring electrical energy, while phase index is an important indicator for measuring transformers. Hall or more sensors for control

In simple independent testing of current and current, phase indicators are not controlled and phase indicators (such as 50 Hz phase error indicators) are not provided.

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