How to improve the error prevention of the load-break switch?

The working principle and structure of the load-break switch itself are relatively simple, but due to a large amount of use and high working reliability requirements, it has a greater impact on the design, establishment, and safe operation of substations and power plants. The main feature of the load-break switch is that it has no arc extinguishing capability and can only open and close the circuit when there is no load current. So how to improve the error prevention of the load-break switch? Next, let's go take a look.

This is the content list:

•  The role of error prevention improvement

•  Application of Mistake Prevention Improvement

The role of error prevention improvement

Blocking the load-break switch control wiring with the corresponding circuit breaker can effectively prevent the disconnect switch from being pulled and closed with a load. However, in the operation of the bus-side isolating switch and the line-side isolating switch, due to human reasons, the operation sequence may be reversed. This is not allowed by the principle of switch and switch operation, and it is also one of the causes of accidents in the power system. To prevent the operating sequence of the disconnect switch from being reversed, the original load-break switch control wiring of the factories and stations that do not use the program lock to prevent errors should be improved to prevent misoperation and reduce unnecessary accidents.

Application of Mistake Prevention Improvement

The auxiliary contact of theload break switch is connected in series in the load break switch control and blocking circuit, that is, the normally closed auxiliary contact of the line side load break switch is serialized in the bus-side load break switch control blocking circuit, and the line side load break switch control circuit is in series The normally open auxiliary contact of the isolating switch on the bus side. Use the electromagnetic lock to prevent misoperation of the loading opening and closing lock wiring as the original control wiring. This kind of wiring can effectively prevent the load-break switch from being pulled and closed, but it may cause the load-break switch operation sequence to be reversed.

After the improvement, the single-bus-bar feeder loads open-close lock wiring. Power failure operation: After opening the circuit breaker, only the line side isolation switch can be opened first, and then the bus side isolation switch can be opened. Power transmission operation: when the circuit breaker is in the off position, only the bus-side isolation switch can be closed before the line-side isolation switch can be closed. This kind of wiring not only prevents the load-break switch from being pulled and closed but also prevents illegal operations that violate the operating principles of switches and switches. The advantages of improved wiring, this improved wiring not only retain the advantages of the original load-break switch control wiring, but the most important thing is also that it can effectively prevent illegal operations that violate the operating principles of switches and switches and reduce unnecessary accidents. This kind of improved wiring is simple and reliable, and the investment is less. It is suitable for the wiring of electromagnetic locks to prevent errors and the control wiring of the load-break switch of pneumatic operation, electric operation, and electro-hydraulic operation. In the device that does not use a program lock to prevent errors, the load-break switch is equivalent to the function of the program lock.

Haivo Electrical Co., Ltd, is a global supplier of power equipment and services. Load-break switches have always been the company's key product development. If you are interested in the affairs of load-break switches, you can contact us. Our website is https:/ /www.haivofusecutout.com/.