I have a question regarding ground fault issues in 10KV motors
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When a 10KV high-voltage unit fails and grounds, it can cause severe damage to the motor. Such a risk does not exist for low-pressure units. This sentence states that a fault ground condition poses a serious threat to 10KV motors; please explain what the hazards are There is also the issue of fault grounding; why does it pose no hazard to low-voltage motors?
When a 10KV high-voltage unit fails and grounds, it can cause severe damage to the motor. Such a risk does not exist for low-pressure units. Where does this come from? The higher the voltage at the time of a ground fault, and given that the current level remains similar, the higher voltage will result in more heat generation and thus more damage to the motor windings and insulation. In such cases, it is difficult to restore the motor through repairs, and in some cases it is even impossible to repair it at all.
I also saw it online; I just didn’t understand what it meant. I’m considering whether the 400KW equipment should consist of one 10KV motor, or two 380V 200KW motors. I found online that high-voltage motors also have their disadvantages, so I don’t understand what is meant by the hazards associated with faulty grounding mentioned above.
It depends on the specific device and its operating characteristics in order to select a relatively appropriate model
Both are of the neutral-point grounding type; one may not cause harm to people, while the other can knock out a group of people
This claim is unfounded. The person upstairs said that there was a ground fault. Indeed, for humans, a 10kV motor is somewhat more dangerous. That’s correct. But the original poster said it poses a greater threat to motors; I don’t think so. First, it is necessary to determine what grounding system the 10kV neutral point uses. Generally speaking, a 10kV system cannot be a directly grounded system; it is more common for the neutral point to be grounded through an arc suppression coil or a resistor, or even not to be grounded at all. In the event of a single-phase ground fault, the fault current is kept within a certain range (usually below 200A), so the fault current is relatively low and poses less damage to the motors. Conversely, in a 380V system the neutral point is directly grounded; however, when a single-phase ground fault occurs, the ground fault current becomes very large (similar to the three-phase short-circuit current), which makes it easier to damage the motor.