In our current society, our life is inseparable from electricity, computers, lights, TVs, mobile phone charging, large mechanical equipment, etc. It can be said that without electricity, it will be difficult for us to live and survive. But We all know that electricity is very dangerous, and if it is handled carelessly, it will bring irreparable loss to life. Many of us will see power distribution units in shopping malls, communities and factories, so what should we do when our electricians are repairing them? To keep them safe? Then it involves a piece of equipment that most people rarely have access to - the grounding switch. So, what is the use of the grounding switch? How does the grounding switch. close? Let us Get up and find out!

The role of grounding switch in power system

1. Cause artificial grounding and meet the protection requirements. Ensure that there is an obvious mechanical grounding point in the loop, make sure that the line has no residual voltage, and ensure the safety of maintenance and line shutdown.

2. Instead of the portable ground wire, ground the equipment during maintenance of high-voltage equipment and lines to protect safety.

3. The location of the grounding switch configuration is generally beside the isolation switch on both sides of the circuit breaker, which plays a role in effectively grounding the two sides when the circuit breaker is overhauled to ensure personal safety.

How to close the grounding switch Let's take the central cabinet as an example. The power line of the central cabinet adopts the "hand in hand" power supply method, and when the circuit breaker in the central cabinet is in the experimental position, the outlet side may still be powered from other substations. Before closing the grounding switch, make sure that there is no electricity on the outlet side. At present, there are three main closing operation methods:

1. Use electric inspection handcart Before closing the grounding switch, pull the circuit breaker handcart out of the cabinet, then push it into the electric inspection handcart, and close the line grounding switch after verifying that there is no voltage.

2. Open the door for electric inspection When the circuit breaker is in the test position, and the live display device detects that there is no voltage on the line, open the cabinet door to check that there is no voltage, and then close the grounding switch.

3.Relying on the function of the line side live display locking device This operation method is to close the grounding switch as long as the line side live display locking device indicates that there is no electricity and the locking is open.

Method 1:has a large amount of operation, which is equivalent to twice the power outage operation without the electric inspection handcart. At present, only the busbar power inspection and grounding operations are performed, and special electric inspection handcarts and grounding handcarts are used.

Method 2:is adopted by some power departments, and the operation procedures are more complicated.

Method 3: is one of the most commonly used methods for central cabinets. When the circuit breaker equipment is pointing to the test position, only when the line side indicates no electricity, and the live display device indicates that it has electricity and can operate normally, the blocking electromagnet indicates that there is no electricity. The grounding switch can only be closed when there is electricity and can operate normally. If any fault or power loss occurs to the electrified display device or the blocking electromagnet, the closing operation will not be performed. When the electrified display sensor is faulty or disconnected, it will It is reflected by the indicator light on the display.