In the usual practice of installation and overhaul of power distribution equipment, there are often problems that affect the normal operation of the circuit breaker and are often neglected. For example, the SN10-10 I type oil-less circuit breaker can not be installed after the arc chamber is installed. Check the assembly quality: the contacts of the vacuum interrupter in the vacuum circuit breaker cannot directly observe the action and contact conditions. 1 Phenomenon analysis The high-voltage circuit breaker is an important device in the power grid, and its function and reliability of work. It directly affects the stable and safe operation of the power grid. In the multiple circuit breaker type test, I found some problems that I didn't pay much attention to in normal times. If it is not handled well, it will directly affect the success or failure of the test and this phenomenon occurs on the circuit breaker in operation. Will inevitably affect the reliable operation of the circuit breaker Take the zero-crossing arcing of SN10-10 I type oil-less circuit breaker as an example, during a type test. When the 10% and 30% joint test is carried out, zero-zero arc extinguishing occurs. Seen from the waveform. No abnormal situation, only after the zero crossing, the arc is cut off, after disintegration. It was found that the arc extinguishing piece of the circuit breaker was loose and not pressed, and the pressure relief of the arc extinguishing chamber caused the arc extinguishing pressure to be small, and the arc was continuously blown. After analysis, the reason is that the mechanism and the transmission part are accurate and reliable. It is the mechanical force that pulls off the arc when the conductive rod goes down. This phenomenon is particularly caused by our will. Because, under normal operating conditions, the SN10-10 I type oil-less circuit breakers are too many in the operating environment of the small current, the maintenance personnel will not check the arc chamber too seriously. For the manufacturer, the product is only disassembled and assembled, wiped clean and installed as it is, unless the obvious damage is found, the arc extinguishing chamber will be replaced. The manufacturer uses the mold casting method when producing the arc extinguishing sheet. When the product cools and solidifies, the flat quotient will shrink and be called a dent. If you find such a product. Be sure to check for overlap between the top and bottom sheets. If yes. The grinding process should also check for the presence or absence of dents around the middle aperture. In severe cases, it must be replaced. Because, if there is a dent in the periphery, there will be pressure relief. When breaking a large current or the mechanism is slightly blocked. The arc pulls continuously and the switch will explode. For example, there are large dents around the center hole of the arc extinguishing piece. However, there is a greater danger in the surrounding joints. Because the upper and lower arc-extinguishing chambers are in the closing position, the arc-extinguishing chamber is closed, and the pressure-retaining capacity of the airbags on both sides is designed, but if The dent increases the volume of the balloon. It may cause two consequences: 1 switch arcing distance is large, arcing is sufficient, the airbag capacity is enlarged, thus prolonging the arcing time; 2 the airbag design pressure is not up to, and the arc extinguishing ability is reduced, such as abnormal switching action. This can cause the switch body to explode. Source: High voltage switch network 2 solutions The arc extinguishing chamber should be cleaned not only every time the switch is disassembled. And it should be checked piece by piece. If the congenital defect is resolutely replaced, if it can be polished, it will be polished and combined layer by layer. If the burning trace around the center hole of the arc extinguishing piece burned by the arc during the opening process of the circuit breaker is found, it can be polished with wood sandpaper. Treatment; if it is found after grinding, there are still obvious dents. Resolutely abandon it. After assembling the arc extinguishing chamber, when tightening the arc extinguishing piece, it is necessary to use a special tool reasonably. Be sure to press and press the copper clamp of the switch interrupter. Because the SN10-10 I type terminal block should be fixed on this copper block, if only the arc extinguishing piece is fastened. This may cause the upper terminal block to be offset, and vice versa for pressing the arc in order to align the position. Because the circuit breaker is divided into very large currents during the combined action. The electric vibration force is very large, and the soft copper wire of φ45mm can be pumped into the air, and the terminal of the circuit breaker can be torn off. If the above phenomenon occurs. Then, when the switch is closed, the arc extinguishing piece may move, and when it is opened, it may cause an explosion. Therefore, be patient when assembling, put the gasket and take the tightening advance of the copper clamp. Tightly press the copper clamp with a special tool. In the type test, no matter how close you are to the arc extinguishing chamber, after the high current is combined (the copper compact may be tight, it is because the pressure is high, push it up). The arc extinguishing piece must be loose. Therefore, the switch must be disassembled after the large current is divided. 3 contact offset solution Whether in the type test or in the usual equipment inspection and debugging, the moving contact of the vacuum interrupter of the vacuum circuit breaker is not on one axis. According to the general structural requirements in the general technical conditions, the manufacturer should have an indication mark on the vacuum interrupter that can reflect the degree of contact wear. In the mechanical and mechanical parameters of the vacuum circuit breaker, it is proposed that the dynamic and static contacts are allowed to wear. The cumulative thickness requirement, however, in the entire regulation, there is no regulation of the consistency of the axis of the moving and stationary contacts, but in fact. Because of the error in the processing or assembly of the end cap hole, the eccentricity of the moving and static contacts is caused, and even the phenomenon of tilting is dangerous. (1) If the moving contact is tilted, the contact with the static contact after closing may be unilateral, or it may be anastomoled under the driving of the closing work, but the pressure of the end face is uneven, and the pressure is on one side. Large, one side of the pressure is small, and this will inevitably cause the unilateral wear of the moving and static contacts to increase, which will cause plastic damage of the bellows. In the usual inspection, the DC resistance is not detected. It may affect the opening distance of the contact, and may also affect the contact bounce time of the contact, and it will definitely affect the service life of the arc extinguishing chamber. Because the moving contact is in the movement of the opening and closing, it is bound to increase the wear, thereby increasing the chance of breaking the vacuum, and the re-combustion rate of the vacuum interrupter is difficult to decrease. (2) If the static contact is tilted or eccentric, it is transmitted to the end cover through the static contact under the action of the closing function, and h is sure that the jK is uniform, then, whether it is glass or ceramic arc extinguishing plug . After the left movement, the pressure relief phenomenon must also occur. Therefore, whether such a moving contact or a static contact, such an axial shift or tilt phenomenon is not allowed. In addition to factors such as errors and mistakes in the manufacture and assembly of the vacuum interrupter, this phenomenon may also occur when the vacuum interrupter is assembled to the circuit breaker, especially in the hand-operated switchgear. So In order to solve this problem, it is recommended to mark a relatively accurate axis line in line with the top and bottom covers, and the axis of the moving and stationary contacts, in addition to the glass or ceramic shell of each vacuum interrupter. The line is consistent, then the problem is completely overcome, and whether the switch is in the open position or the closed position, it is easy to check the eccentricity, even the eccentricity can be checked out, and this The measures do not increase the cost of the manufacturer, but should also be written into the general technical conditions of the indoor high-voltage vacuum circuit breaker, so that the manufacturer and the operating unit have standards to implement.
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