The current transformer is a very important equipment in the power system, which is used to convert high current to low current for easy measurement and protection of equipment. However, in practical applications, current transformers may have some minor problems, which may affect the performance and safety of the system. Some possible problems are listed below:

1. Error problem: The current transformer has errors such as ratio difference and angle difference. If it exceeds its allowable error range in actual use, it will affect the accuracy of measurement and the reliability of protection.

2. Saturation problem: When the current is too large, the current transformer may be saturated, causing the secondary current to be distorted or zero. This may cause the protection device to malfunction or fail to operate.

3. Insulation problem: There are insulation requirements inside the current transformer. If the insulation is poor, it may lead to leakage or breakdown. In addition, external dust, moisture, and the like may also cause a decrease in insulation performance.

4. Wiring problems: The wiring of the current transformer should ensure that its polarity and connection method are correct, otherwise it may cause the current direction to be wrong or the measurement to be inaccurate.

5. Load problem: The current transformer has a certain load capacity. If the actual load exceeds its rated value, it may cause the error to increase or the performance to decrease.

External interference: The current transformer may be affected by external magnetic field, electric field and other interference factors, resulting in unstable performance or increased error.

7. Aging problem: After long-term operation, the current transformer may experience aging phenomena, such as internal component aging, insulation performance degradation, etc., which may cause performance degradation or failure.

8. Improper selection: When selecting a current transformer, if the selection is improper, such as the rated current, rated voltage and other parameters are not properly selected, it may lead to the inability to meet the actual demand or excess performance.

In view of the above problems, the following measures can be taken to prevent and deal:

1. Regular calibration: check the current transformer regularly to ensure that its performance is within the allowable error range.

2. Inspection and maintenance: regularly check the insulation performance and wiring of the current transformer to ensure its normal operation.

3. Reasonable selection: When selecting the type, the appropriate current transformer should be selected according to the actual needs.

4. Avoid overload operation: ensure that the actual load of the current transformer does not exceed its rated value.

In short, the correct selection and use of current transformers, and regular maintenance and verification, can ensure their normal operation and extend their service life.