Isolation switch common troubleshooting method

First, the type of common fault operation of the isolating switch

The types of faults commonly found in the operation of the isolating switch are as follows:

1 porcelain bottle breakage failure. Porcelain bottle breakage is related to the quality of the product and to the overall quality and operation of the disconnector. Improper control of the porcelain bottle during the firing process may cause problems such as porcelain sandwiching, uneven density, and poor cement filling. In addition, the quality inspection methods are not strict, resulting in the assembly of individual poor quality porcelain bottles into products, and put them into operation. Security poses a great threat. The operator may improperly operate the separator when the split switch is used, and the force is too strong, which may cause damage to the porcelain bottle.

2 The conductive loop is overheated. Abnormal heating of the conductive loop often occurs during operation, mostly due to the fatigue of the static contact finger, the deterioration of the characteristics, the contact of the static contact finger and the increase of the contact resistance of the long-term operation. During operation, due to the long-term compression of the static contact finger compression spring, if the working current is large and the temperature rise exceeds the allowable value, the elasticity will be deteriorated, the vicious cycle will eventually cause burning, which is the main cause of the contact heating. . In addition, the silver plating process of the contact is poor, the copper is easily worn, the contact surface is dirty, the contact is not inserted enough, the bolt corrosion is caused by the corrosion of the contact surface of the clamp, and the like is also caused by heat.

3 institutional issues. The problem of the organization is that the operation is out of order. If the refusal or the closing is not in place, it often happens during the switching operation, which affects the safe operation of the system. Due to the poor sealing of the mechanism box or the rusting of the water, the mechanism is seriously corroded, the lubrication is dry, the operation resistance is increased, and the operation is difficult, and the component damage, such as the gear shifting and the connecting rod twisting, may occur.

4 transmission is difficult. Corrosion of the transmission system of the isolating switch causes large transmission resistance and even rejection. For example, in the operation, the base bearing is rusted and inoperable. This is because the main shaft of the transmission component is dry, the bearing is dirty, and the butter is dirty. Caused by cognac.

Second, the isolation switch operation and maintenance, maintenance recommendations

When the switch unit is overhauled in 1 year, the maintenance of the 220kV busbar disconnector should be strengthened and should be included in the plan and regulations.

2 isolating switch contact spring parts replacement or the replacement of the entire static contact should be based on the degree of aging shortened cycle.

3 The resistance of the contact surface of the moving contact is the main cause of heat generation. The resistance measurement of the conductive loop of the isolating switch after the inspection is also the means to check the quality of the inspection. Whether it is qualified or not, as the condition for the operation of the maintenance equipment, the loop resistance tester can be used for the loop resistance. Make measurements.

4 contact online temperature monitoring is the main means to find the heating of the joint. The heating of the contact is more concealed. The inspection is more difficult. The online temperature measurement should be further strengthened. The key temperature measurement is to periodically measure the temperature where the temperature rise exceeds a certain value. The suspected temperature measurement is to measure the temperature of the large load point and the part that may be hot when the load is large.

5 Establish regulations on contact overheating.

6 Isolation switch contactors are many without protective cover, which is prone to accidental collision during operation. Pay attention to the fastening of the terminals during operation and maintenance. The sealing ring of the door is easy to age and should be replaced frequently. A good seal can reduce the maintenance workload.

Through the understanding of the accident caused by the failure of some isolating switches, we must pay sufficient attention to the phenomenon of equipment damage or even large-scale power outage. We should strengthen the process quality management and flexibly handle according to the structure of the equipment. For daily inspection, we should grasp the equipment in time. The operation status, find the fault as soon as possible to identify the cause and eliminate hidden dangers, and ensure the safe and reliable operation of the power grid. With the continuous advancement of science and technology, the isolation switch is continuously improved and the performance is continuously improved. It is recommended that all units improve and replace the equipment based on safety to ensure the stability and safety of the system.