Corresponding solutions caused by current transformer faults

1. There is a solution to abnormal noise or over-temperature of the iron core. In the whole process of current transformer operation, if there are problems such as open circuit or overload of the secondary circuit, abnormal noise may occur and the iron core may be seriously over-temperature. Assuming that there is no symmetrical application of semi-conductor material car paint, it will also allow loud noises. Therefore, assuming that there is an abnormal noise or an over-temperature condition of the iron core is present in the operation of the current transformer, a detailed inspection of the specific situation of the instrument panel on the other side is required to find the cause of the problem immediately. It is assumed that the voltage transformer caused by a large load is abnormal. It is necessary to reduce the load appropriately and ensure that it can meet the rated load specifications. In addition, observe the detailed operation of the current transformer again; assume it is a secondary circuit If the voltage transformer appears to be abnormal, the operation of the machine and equipment must be immediately interrupted; assuming that the insulation layer is destroyed and the charging and discharging problem is caused, the current transformer needs to be replaced immediately.

2. Solution to abnormal operation. In the actual operation phase of the current transformer, there may be problems such as open circuit and hot problems, and also problems such as loose anchor bolts and strange noises. At this time, workers need to listen to opinions when solving such problems. Scientifically effective methods, such as when identifying the open circuit problem of the secondary circuit of the current transformer, it is necessary to carry out a comprehensive consideration of the meter label, noise, etc.; when testing the hot condition of the current transformer, it can go through the temperature test Wax pieces to carry out the test. Especially when querying the open circuit of the secondary circuit, if it is not very good, the indicator of the ammeter is "0", and the watt-hour meter is interrupted at this time, and then there is a buzzing sound. At this time, the current transformer will appear There was an abnormal sound, and many terminal blocks were burnt. Once any one of these situations appears in the whole process of the current transformer operation, it is necessary to immediately interrupt the operation of the machinery and equipment.

3. The open circuit of the secondary circuit is solved. In the operation of the current transformer, the secondary side high voltage condition is likely to be caused by the roundness of the magnetic flux in the iron core, which will cause the charging and discharging condition to occur at the open circuit point of the secondary circuit, and then the charging and discharging sound or the sparking discharge condition will be generated. In addition, the loss of the iron core will increase due to the roundness of the magnetic flux and become hot. In this case, odors and abnormal noises can be generated in the insulating layer material. At the same time, the abnormality of the rotational speed ratio of the watt-hour meter is generally caused by the unmarked or undecided marking of the ammeters connected to the secondary side of the current transformer. Therefore, once the secondary side of the current transformer presents an open-circuit condition during the entire operation of the voltage transformer, it is necessary to immediately interrupt the operation of the machinery and equipment, and listen to effective methods to solve the problem. Once there is no way to carry out a power outage, it is necessary to quickly reduce the primary load current, and connect the secondary circuit of the current transformer through the insulation layer special tools before the open circuit point to form a short circuit fault. After the problem is cleared, the short circuit will be shortened. Route disassembly.

4. Ensure that the wire connector of the primary terminal has good contact. Usually check the contact condition of the wire connector position of the terminal on time to ensure that the total contact area is sufficient, and in addition, avoid over-temperature problems. It is necessary to make the equipotential connection between the expander cover and the L2 terminal block well to avoid floating of the potential difference. The anti-reversal method is applied to the secondary line to lead out and break, to avoid the internal wire twisting and breaking due to the actual operation of the outside world.

5. Ensure that all test values are normal. During the operation of the current transformer, the value of the dielectric loss factor tg is abnormal. It is necessary to sort out and analyze the relationship between tg and temperature and working voltage; when tg shows a significant temperature change following the increase of the experimental working voltage, the demand is immediately interrupted Running. Assuming that the results of chromatographic analysis are abnormal, it is necessary to investigate its improvement development trend, carry out tracking analysis of detailed data and information, and immediately find an effective way to listen to opinions.

6. Current transformer demagnetization query. The magnetic loss of the iron core of the voltage transformer is likely to cause a sudden decrease in the amount of current. When in the case of large current, the current transformer will seal and control the secondary winding and the switching power supply will suddenly open. When the magnetic loss exists in the iron core of the voltage transformer, the magnetic permeability of the iron core is reduced, which will inevitably harm the function of the voltage transformer. Voltage transformers that have been used for a long time need to be demagnetized.