How To Solve The High Voltage Isolating Switch Failure?
Switches, turning them on and off may affect our lives. When we change light bulbs or repair electrical appliances at home, we must turn off the switch so that we can do it with confidence. Switches are important. They are equivalent to the starting point and the end point. Some switches are like this, such as high voltage isolator. They are generally installed on high-voltage electrical appliances and devices to protect people's safety when they are performing maintenance work and to isolate voltage. We must check such important things regularly to avoid high voltage isolator switch failures.
The following are the common types of failures in hv isolator operation: porcelain bottle breakage failure, mechanism problems, and heating of the conductive circuit. In the operation of the system, hv isolator switch has more defects and failures, involving many aspects of problems. It can be summarized as mechanism problems, including operation jamming, inadequate closing and opening, rust, water ingress, dry lubrication, mechanism jamming, auxiliary switch failure, etc. These defects lead to abnormal closing and opening of switches, refusal to operate, and inadequate closing and opening to varying degrees; secondly, poor contact of the conductive system causes abnormal heating of the conductive circuit. The reason is that the switch contact spring fails, resulting in poor contact or inadequate closing, looseness and cracking of the conductive circuit, and there are also problems with poor conductive circuit structure; the biggest threat to safe operation is the porcelain bottle breakage failure, which has a serious impact. These faults are explained in detail by Leerwo as follows:
high voltage electrical isolator porcelain bottle breakage failure
The isolator high voltage with this kind of fault is especially common at the 220kV level, and some have developed into major accidents, so the impact is huge. The problem of post insulator and rotating porcelain bottle breakage has occurred over the years, some of which are old products that have been in operation for many years, and some are new products that have been put into operation for more than a year.
Insulator breakage is related to the product quality of the electric porcelain factory, and also to the overall quality of the disconnector, the uneven casting of the insulator, and the problem of cement glue installation. In addition, lax quality inspection also leaves hidden dangers in operation. Defective and hidden insulators are not detected. After being assembled into products, they pose a great threat to safe operation.
In addition to supporting insulators, rotating insulator fracture failures also occur from time to time. Rotating insulators are mainly subjected to torque during operation, and porcelain bottle fracture accidents have not been effectively prevented so far.
For the problem of porcelain insulator fracture, it is necessary to comprehensively manage it. First of all, it should be tackled from the source. Insulator manufacturers should strictly follow the process and stabilize the production process. Each insulator should be carefully inspected to ensure that qualified products can be shipped. Isolating switch manufacturers should strictly control the purchased parts, strengthen inspection, and improve the overall quality of isolating switches. Compare the operating torque of the same type of isolating switches during manual operation. If there is difficulty in operation, do not force the operation. A better way is to carry out the pilot and promotion of new technologies for detecting defects in the porcelain bottles of isolating switch pillars, and further research and develop online monitoring of porcelain bottle defects. It is recommended that during minor or major repairs, the number of no-load mechanical operations should be appropriately increased to increase the probability of exposing porcelain bottle defects during power outage operations. Some maintenance operations are only performed 2 to 3 times, which is too little.
