Why can’t the current transformer open the secondary circuit

1. The secondary side current produces an unbalanced effect, resulting in a significant increase in the magnetic flux of the iron core. The induced electromotive force is proportional to the magnetic flux, which leads to a significant increase in the voltage on the secondary side, which is easy to bring about the danger of electric shock, and even causes the insulation of the secondary side circuit and components to be affected and damaged.

At this time, the iron core will have obvious symptoms, such as discharge sound, electric spark, noise, etc.

2. After the magnetic flux of the iron core increases significantly, the temperature of the iron core will increase significantly, causing the voltage transformer to burn out. If this happens, we will find the transformer smoking and having a burning smell.

3. Since the magnetic flux is greatly increased, the iron core becomes saturated, so there will be a large amount of residual magnetism, resulting in a significant decrease in the accuracy of the transformer.

4. The secondary side current is zero, and the power meter and ammeter show zero. The aluminum plate of the electric energy meter does not rotate, does not make noise, and the current relay cannot operate normally, so the protection of the primary circuit cannot be realized. and monitoring.