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Small capacity Huawei UPS power supply overvoltage protection method
Small capacity Huawei UPS power supply overvoltage protection method
Huawei UPS power supply as a power supply system, overvoltage can not be avoided, then how to protect the small capacity Huawei UPS power supply over voltage? Here's how to share two protections.
1. Increase the flow capacity of the MOV. For example, the MOV device of 20D471, 25D471 or even 32D471 is used to increase the flow capacity to 10kA to 25KA (8/20μs, once). In this way, it can withstand long-term or periodic over-voltage energy discharge, and can also keep the residual voltage on the line at a low level. However, this will increase the cost of protection (tens of times the increase).
2. Increase the operating voltage of MOV. For example, use MOV devices such as 14D561 or 14D621 to increase the operating voltage from 470V to 560V or 620V. This greatly reduces the MOV's probability of action and diarrhea without changing the flow capacity. Time without increasing costs. However, this will increase the residual pressure on the line.
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