Through the analysis of the principle of detecting the fracture state of the high-voltage switch characteristic tester, it is concluded that the instrument forms a circuit through the switch, grounding, and the fracture of the instrument. By detecting the on/off state of the entire circuit to test the fracture state of the instrument, that is, using this principle to test the opening and closing time of the switch. Generally speaking, we can connect the dynamic/static contacts of the high-voltage switch to the fracture testing end of the tester, and then ground the other contact, so that the signal of the instrument forms a loop state with the instrument through the switch and ground.

 

In practical situations, there may be a situation where we have not disconnected from remote grounding, and the contact connected to the instrument is grounded remotely. We then short-circuit another contact, which will cause the entire switch to be in a short circuited state regardless of its state. At this point, no matter how the high-voltage switch characteristic tester is operated, the switch will display a closed state.

 

For this type of malfunction, we can solve it in two ways. One is to exit remote grounding through remote grounding control. However, it is worth noting that there may not be only one switch on remote grounding protection, and there may be other devices running. If remote grounding is exited, program problems may occur. The second is to change the line, which is also the simplest method. We can directly connect the originally grounded contact to the grounding terminal of the instrument, so that the above problems will not occur. The fracture detection of the instrument can also be restored to normal, and the test can proceed smoothly.