Why does an RCD work when a computer for mining works?
Hello, there is a mining computer with a home-made aluminum case, power up to 2kW. It can work stably for a long time up to a month of continuous operation, but then the RCD trips. The house is new. Sockets are all grounded. During the test, the indicator screwdriver, when touching the body, the lamp quickly blinks once and disappears, no longer appearing. After a couple of minutes, when checking, the indicator blinks once again and disappears. What is it and how to fix it?
Hello! The power supply must have good contact with the case, if there is no grounding, then there must be voltage on the case. Those. The screwdriver often either blinks or just burns. But when grounding, the leakage current is weak, and for most RCD ratings it is insignificant. Moreover, if this were an effective basis for its operation, it would operate constantly, almost at every turn-on.
Therefore, the RCD is unlikely to work because of the computer. Either some other devices are on this line, or for some other reason you have leaks on the case. For example, leaks occur in the power supply, but again you say that it works for a whole month. By the way, even through dust in the PSU, a leak can occur. RCD of what denomination do you have?
But I repeat the third time: if the reason was in the computer - it would work immediately, and not after a month. Try for the sake of experiment to put another RCD with a high tripping current (next rating).
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“The power supply must have good contact with the housing” - apparently the problem was this, as my power supply did not have any contact with the housing at all. The indicator on the screwdriver after correction during the observation no longer blinked.
After some time, the indicator again began to blink once, then for about 5 minutes if you wait again it blinks, as if accumulating. Denomination UZO 63A.
The indicator is barely visible in the dark, literally for a second
Then it’s even more interesting where the voltage on the case came from if the PSU was isolated from it. The voltage then appears on the PSU case from its board, and is transferred from the PSU case to the system unit case, if the sockets are grounded, it drains from the cases to the ground!
I understand it has become less likely to blink? You wrote the rated current of the power circuit, you need to specify the differential current, it is usually indicated either as Id or (triangle icon) I, measured in milliamperes, mA.
0.03A is written at the triangle. I checked it again, the indicator does not blink again, some kind of mysticism. Apparently, you still need to check the electrician on the spot, otherwise you can guess for so long. In any case, thanks for the responsiveness.