The current transformer is usually inspected once a day to once a week. In addition to the naked eye inspection, can also be used by ear or hand touch, that is, people's direct sense of the main method to check whether there is abnormal sound, smell or fever. These routine checks are necessary to prevent serious accidents in advance. Therefore, daily inspection should be listed as a very important work content.
Inspect the appearance with naked eye for dirt, cracking and deformation, oil and impregnating agent for leakage, loosening of joints, etc.
Hearing whether there are abnormal sounds; The sound produced in the transformer is caused by free discharge, electrostatic discharge and mechanical vibration caused by magnetostriction of iron core. There is a kind of discharge sound is caused by the foreign body attached to the surface of the porcelain sheath. In the case of the contamination of the electrode, the audible "crackle, crackle" will occur. Or something like that. In addition, the sound of mechanical vibration has the following situations; The equipment vibrates at a frequency twice the rated frequency and resonates with the frame. The resonance caused by the loosening of bolts and nuts can hear big sound; The external environment of the installation site resonates and loud sound can be heard. In these cases, it is important to quickly identify the cause of the abnormal sound and deal with it promptly.
Constant attention should also be paid to odors, which are valuable in preventing major accidents of electrical equipment in advance. When distinguishing abnormal smell, it should be made clear which kind of equipment is emitted. For example, dry transformer gives out the smell of burning after insulation aging, while oil-immersed equipment gives out the smell of leaking oil.
In the tour should pay attention to the following items of inspection;
1, insulation casing is clean, there is no defect, crack and discharge phenomenon, sound is normal, there is no crack, damage phenomenon.
2. The appearance of the oil-filled current transformer should be clean. Whether the oil level is normal and there is no oil leakage.
3, the lead and wire clip and the connection part of the secondary loop should be in good contact, not slack.
4. The shell and the secondary loop are well grounded, and the grounding wire should be tightened.
5, the joint is not overheating and ignition phenomenon, the bolt is not loose, there is no abnormal smell.
6. Whether the three-phase indication value of the ammeter is within the allowed range, and whether the current transformer is operating under load.
7, there is no open secondary winding, grounding wire is good, there is no loosening and fracture phenomenon.
8. The connector of the lead wire at the primary end of the ct should be in good contact with enough contact area to prevent overheating caused by poor contact.
Current transformers produced by Wuhan Xinshengneng Technology Co., Ltd. have good product quality, complete models, stable performance and guaranteed after-sales service. Welcome to call 0312-3188565 consultation!
