Fault handling and maintenance of capacitor of air package regulating machine

1. Fault treatment and maintenance of air packaging machine capacitor "tummy belly" analysis machine

Fault treatment and maintenance of the capacitor of air packaging machine; "Tummy belly" accounts for a large proportion in the failure of mechanical and electrical vacuum packaging containers. It is normal for the oil tank to expand and contract with the change of temperature. However, when partial discharge occurs in the tank and a large amount of gas is generated in the insulation, the tank wall will be deformed and an obvious "belly bulge" phenomenon will be formed. The tummy device can't be repaired, it can only be removed and replaced with a new capacitor. The cause of "drum belly" gas product quality problems, such as poor quality of insulating paper and lead foil, impregnation liquid containers not inspiratory sex oil, and no qualified purification treatment conditions, together with the design on the pursuit of than the indicators of work field choice is higher, the low quality of the product run in high electric field, will cause the "drum belly" and fault component breakdown, fuse fusing. Therefore, the product quality of capacitors must be strictly checked before operation and use.

2. Fault handling and maintenance of the capacitor of the air packaging machine; Treatment of leaking oil

Fault treatment and maintenance of the capacitor of air packaging machine; The oil infiltration of the metal shell of the mechanical and electrical container of full automatic vacuum packaging generally occurs at the bottom and the edge of the upper cover of the rolling weld, the upper cover of the ground wire terminal and oil hole, nameplate and the handling handle on both sides of the welding. Before operation, the capacitor should be heated to 75℃ according to the general standard and kept for 2h test to see if there is any leakage. Minor leakage can be solved by soldering or brazing with tin and epoxy resin. When brazing, in addition to the cover oil hole should be used as flux rosin, other parts can be used as flux zinc chloride, but the amount should not be too much. Do not use acid solder such as hydrochloric acid or cyan. Assembled casing capacitors, oil leakage often occurs in the outer porcelain sleeve and the oil tank joint surface, the appropriate tightening nut can be solved, do not easily disassemble the outer porcelain sleeve. If you want to open the outer porcelain, you should wipe the seal clean with gasoline, replace the oil-resistant rubber pad, and coated with epoxy resin and other adhesives to tighten; In the process of opening the outer porcelain, care should be taken to prevent the lead copper core from falling into the shell. The capacitor of the welded bushing oozes oil and needs to be repaired. The silver layer should be prevented from falling off when the temperature is too high.

3. Fault handling and maintenance of the capacitor of the air packaging machine; Condenser oil shortage

Fault treatment and maintenance of the capacitor of air packaging machine; When the capacitor is short of oil, a soldering iron can be used to lower the small iron cover of the seal, and then the oil can be poured out for vacuum filling. If there is not enough oil and the element does not show the oil surface, it indicates that moisture has not penetrated the element. Only qualified oil can be added and sealed, and no vacuum treatment is needed.

4. Fault handling and maintenance of the capacitor of the air packaging machine; Analysis and treatment of poor insulation of mechanical and electrical container

Fault treatment and maintenance of the capacitor of air packaging machine; High capacitance and medium loss Angle will lead to poor insulation. A sudden rise in the value of capacitance can be considered as a breakdown and short-circuit of some capacitive elements, because the capacitor is composed of multiple elements in series. If part of the component is broken, the capacitance value will be reduced. The loss Angle of capacitor medium will increase a little, but the increase is abnormal. Because only partial discharge and local overheating will occur medium loss Angle is too large, so the insulation of these products can only be replaced.

5. Fault handling and maintenance of capacitor installed in gas packaging machine; Analysis and treatment of explosion cause of automatic vacuum packing mechanical and electrical vessel

 Fault treatment and maintenance of the capacitor of air packaging machine; The fundamental cause of explosion is the breakdown of capacitor caused by free discharge. The capacitor is fitted with a properly protected fuse whose ampere - second characteristic is less than the burst characteristic of the tank. When a capacitor is short-circuited, the fuse cuts off the power supply to prevent an explosion and to prevent fire and explosion of nearby capacitors.

The star-connected capacitor bank is rarely exploded because the fault current is limited. Single protection fuse is a very important protection device, its ampere second characteristic configuration is appropriate can prevent the tank burst completely, so the use of star connection is also a very important explosion-proof measure. Short - circuit breakdown of paper film and film capacitor is different. After partial discharge, the insulating paper is carbonized at high temperature. Due to the isolation of carbonized paper, the discharge will be maintained for a period of time. At this time, a large amount of gas will be generated. Without the protection of the fuse, the oil tank will burst. The full-film capacitor will be melted under the action of high temperature after discharge, so that the two contacts will be short, and no arc discharge will occur, and no gas will cause explosion, so the full-film capacitor should be selected for explosion protection.

6. Fault handling and maintenance of the capacitor of the air packaging machine; Failure of overvoltage and external factors

The capacitor will be damaged due to overvoltage, system resonance, low insulation strength outside the bushing and poor cleaning work caused by switch reignition. The capacitor will be damaged if the bushing flashover or the arrestor is more than 150m away from the capacitor. But in general, overvoltage is not a big threat to capacitors. Because the small animals are attached to the capacitor facilities, the accidents of casing short circuit and explosion often occur, so in order to prevent the damage of external factors, it is necessary to install the appropriate protection fence or regularly put rodenticide.

7. Fault handling and maintenance of capacitor installed in gas packaging machine; Maintenance of power capacitor of packing machine and box packing machine

Fault treatment and maintenance of the capacitor of air packaging machine; Take parallel capacitor as an example, its use, protection and maintenance can be based on the network voltage, power factor and reactive power automatic switching capacitor, but also according to the schedule of automatic switching or manual switching.

In order to protect the capacitor, protective devices such as overvoltage, overcurrent and voltage loss should be installed to prevent the capacitor from being damaged due to abnormal phenomenon of the system. In case of fault, the fault should be checked in time and replaced with a capacitor with similar parameters.

Periodic power failure inspection and cleaning of capacitor case shell should be carried out for capacitors. Attention should be paid to whether the sleeve and terminal are loose, check the contact of each contact, whether the paint is peeling, whether the oil leakage and whether the shell is deformed, and carry out necessary treatment.