Author: Noyafa–CCTV Tester
On-site fault analysis of high-voltage switch characteristic test Through the analysis of the fracture state detection principle of the instrument, Qianglong Electric came to the conclusion that the instrument constitutes a circuit through the switch, grounding and instrument fracture, and the fracture state of the instrument is tested by detecting the continuity of the entire circuit. On-site fault analysis of high-voltage switch characteristic test Through the analysis of the fracture state detection principle of the instrument, Qianglong Electric came to the conclusion that the instrument constitutes a circuit through the switch, grounding and the instrument fracture, and the fracture status of the instrument is tested by detecting the continuity of the entire circuit. , but also through this principle to test the opening and closing time of the switch. Generally speaking, we connect the moving/static contact of the high-voltage switch to the fracture test end of the tester, and then short the other contact to ground, the signal of the instrument can form a loop state with the instrument through the switch and the ground. In the actual situation, it may happen that when we do not withdraw from the remote grounding, the contact connected to the instrument is grounded through the remote end, and we short-circuit it to the ground on the other contact side. It will cause the dynamic and static contacts of the entire switch to be in a short-circuit state through grounding no matter what state the switch is in, causing the high-voltage switch dynamic characteristic tester to display that the switch is in a closed state no matter how it is operated.
For this kind of failure, we can solve it in two ways. One is to exit the remote grounding through the remote grounding control. However, it is worth noting that there is not necessarily only one switch protected on the remote ground. There may be other devices running. If the remote ground is withdrawn, there will be program problems.
The second is to change the wiring. This is also the easiest way. We can short-circuit the contacts that should be short-circuited to the ground and then not ground, but directly connect to the ground terminal on the instrument, so that the above problems will not occur, and the fracture detection of the instrument can also return to normal, and the test is also Can go smoothly!.
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