The phenomenon and reason of secondary open circuit of current transformer

The main reason for the open circuit of the current transformer in the test terminal in the AC current circuit is that the test terminal itself has quality and structural problems. During operation, the screw rod and the screw hole of the copper plate have poor contact, resulting in an open circuit.
For the terminal box installed outdoors, the junction box has no moisture-proof measures, which leads to excessive rusting of the terminal bolts and gaskets, resulting in green opening.
Wrong operations by repairing personnel during operation will also lead to an open circuit of the current transformer during use.
Because the current in the loop will be very large, if the secondary line terminal connector is not installed properly, it will heat up and burn out, resulting in an open circuit.
When testing the terminal pressure plate, if the metal sheet of the rotating terminal is not pressed against the metal sheet of the pressure plate, it will also cause an open circuit.
The above are the reasons for the secondary open circuit of the current transformer. Let us understand the specific phenomenon of the secondary open circuit of the current transformer.
First of all, the first point is that the indicator of the loop instrument is abnormally reduced or zero.
When the open circuit phenomenon occurs at the second point, the vibration force of the silicon steel sheet will become larger
The third point is that when an open circuit occurs, use a temperature-displaying color-changing wax sheet to detect the current transformer, which will cause serious heating, odor, discoloration, and smoke, etc.
The fourth point is that when an open circuit occurs, the relay protection of the current transformer will malfunction or refuse to operate.
The above 4 points are the phenomenon that the equipment manifests when the current transformer is open circuit
When using current transformers, we should pay close attention to the operating conditions of the current transformers, whether there is a fault, so that the fault can be found and repaired immediately.