Current transformer resistance

common faults of split core current transformers:   1. Overheating.   Overheating, smoking, and glue flow in split type current transformers may be caused by poor contact of the primary wiring, severe oxidation of the secondary wiring board surface, short circuit between turns in the split-type current transformer, or insulation breakdown of the primary and secondary sides.   2. The secondary side of the split-type current transformer is open. At this time, the ammeter suddenly has no indication, the sound of the split-type current transformer increases significantly, and ozone can be smelled and slight discharge sounds can be heard near the open circuit.   The damage of the secondary side open circuit is:   a. The split-type current transformer generates a very high voltage, which poses a threat to the safety of equipment and operating personnel.   b. The core loss of the split core current transformer increases, and severe heating may burn the equipment.   c. The core is magnetically saturated, which increases the error of the split-type current transformer.   3. There is a discharge sound or discharge phenomenon inside the split-type current transformer.   If there is a discharge phenomenon on the surface of the split-type current transformer, it may be that the surface of the transformer is too dirty, causing the insulation to decrease. The internal discharge sound is the internal insulation of the current transformer decreasing, causing the primary winding to discharge the secondary winding and the iron core.   4. The internal sound of the split-type current transformer is abnormal.   The reasons are: the fastening screws of the split-type current transformer are loose, the iron core is loose, the vibration of the silicon steel sheet increases, and an abnormal sound that does not change with the primary load is issued; some iron cores have a certain buzzing sound when there is no load or no load due to poor assembly process of silicon steel sheets; when the secondary side is open, due to magnetic saturation and non-sinusoidal magnetic flux, the silicon steel sheet vibrates and the vibration is uneven, emitting a large noise; the split-type current transformer is severely overloaded, which increases the vibration sound of the iron core.   5. The oil-filled split-type current transformer is seriously leaking oil.   If any of the above phenomena are found during the operation of the split-type current transformer, the load should be removed and the power should be cut off immediately.