Common fault repair and maintenance of reactor

Reactor is used more and more in the system, which makes it often have some similar faults in operation

1. The local temperature is too high; when the reactor is running, the temperature is too high, which accelerates the aging of polyester film. When the rainwater seeps into the crack of lead-in wire or cross epoxy, the mechanical strength will be lost, resulting in turn to turn short circuit, causing ignition and combustion. The causes of reactor temperature rise are: welding quality problems, welding resistance of terminal and winding welding produces additional resistance and heating. In addition, because the design margin of temperature rise is very small, the design value is very close to the international temperature rise limit. In addition to the design and manufacturing reasons, in operation, if the air passage of the reactor is blocked by foreign matters, resulting in poor heat dissipation, it will also cause local high temperature and fire. In order to limit the temperature rise, the ventilation condition of reactor should be improved and the ambient temperature of reactor should be reduced. Colleagues regularly stop maintenance to remove the accumulated dirt on the surface, keep the airway smooth, and conduct detailed inspection on the external insulation status, and deal with the problems found in time.

2. After the surface discharge reactor operates in outdoor atmospheric conditions for a period of time, there will be fog accumulation on its surface. In foggy or rainy days, the surface dust will be affected by moisture, resulting in a large surface leakage current and heat generation. Due to the different speed of water evaporation, the local dry area appears on the surface, which causes the local surface resistance to change, and the current forms a local arc at the interruption. As time goes on, the arc will merge and discharge along the surface. The turn to turn short circuit is the further development of dendritic discharge, that is, the current in the short line turns increases sharply, and the insulation of the line turns is damaged due to the rise of temperature.

In order to avoid dendritic discharge and turn to turn short circuit fault of outdoor reactor, the surface discharge can be greatly inhibited by applying hydrophobic coating; the leakage current concentration on the lower surface can be overcome by embedding ring current sharing electrode at the end; the surface leakage current can be kept to a certain extent by wearing rain cap and external rain proof layer.

3. Vibration and noise fault: the vibration of iron core reactor becomes larger during operation, which causes fastener loosening and noise increase. The main causes of vibration are magnetic circuit failure and the iron core is not compressed or the pressure parts are loose during manufacturing and installation. Generally, it only needs to tighten the fastener again. Sometimes, when air core reactor is put into operation, the AC noise is very high, accompanied by rhythmic beat frequency, and the foundation is heated. This is the strong alternating magnetic flux of Yunwei air core reactor, which brings resonance, eddy current and heat to the surrounding steel components, especially the embedded parts of the foundation. This is the fundamental problem in the design and installation of infrastructure construction, so we can only stop the operation and carry out thorough transformation.