Operating Requirements for Miniature Current Transformer

For the long-term normal use of Miniature Current Transformer, the requirements that should be met during its operation. The Miniature Current Transformer shall not exceed the rated capacity for long-term operation, because the long-term overload, that is, the passing current exceeding the rated current of the current transformer, will cause the error to increase and the meter to indicate incorrectly. It may also cause overheating of the iron core and winding, rapid aging of the edge, and even damage to the current transformer. Current Transformer

Secondly, during the operation of the Miniature Current Transformer, care should be taken to keep its secondary circuit in a closed state. When removing the ammeter and other instruments from the running CT, the secondary winding should be short-circuited first; if the secondary winding is not used, it should be short-circuited. In addition, the secondary circuit of the current transformer has one and only one grounding point.

Third, in practical applications, one side of the secondary side coil and the iron core of the Miniature Current Transformer need to be grounded at the same time. The grounding of the secondary side of the CT is a protective grounding to prevent breakdown of the primary and secondary windings due to edge damage, and the secondary windings are connected in series with high voltage, which will endanger the equipment and the human body. It should be noted that when the secondary circuit of the current transformer is switched, the corresponding protection device should be disabled; it is strictly forbidden to open the circuit during operation.

Fourth, in the circuit system, if the protection and the meter share a set of Miniature Current Transformer, then when the meter circuit is working, attention should be paid to short-circuit the terminals of the meter itself, and be careful not to open the circuit and not to short-circuit the protection circuit. At the same time, the short-circuit position and measures should be determined according to the actual wiring during on-site work. In the same circuit, such as orderly protection, high-frequency protection, etc., should be disabled before the short-circuit.