1) the average trouble-free time of UPS with large capacity is relatively long, generally greater than 200000h, with low failure rate.
2) the price of UPS per unit kva decreases with the increase of UPS capacity.
3) large-capacity UPS is convenient for management and guaranteed for maintenance.
4) it is beneficial for users to use battery economically and reasonably.
Different UPS models are selected according to different power distribution systems of users to meet the requirements of carrying capacity of power distribution systems of users. Because the power supply environment of most industrial enterprises fluctuates greatly, the UPS model which allows a large fluctuation range of mains power supply can adapt to the harsh power supply environment of mains power grid.
Choose the model with strong overload capacity and excellent resistance to output short circuit. As long as UPS performs the switching operation between mains ac bypass power supply and inverter power supply, there is always the probability of failure. Obviously, the stronger the overload resistance of UPS is, the less chance UPS will objectively make the above switching, and the lower the failure rate of UPS will be. An appropriate anti - transient surge suppressor should be provided to protect the control equipment.
Choose the model with low potential of UPS output midline to ground, the data transmission rate can be as high as possible, and the bit error rate of data transmission can be reduced. According to the requirements of different levels of centralized monitoring system, an intelligent UPS system with different network control functions is formed. In order to maintain the management convenience and manage the UPS operation, the monitoring part must be easy to operate and displayed in Chinese.
As mentioned above, two delta h-series UPS are selected for the automatic control system equipment of the steel rolling system. Although UPS has a high reliability, the average trouser-free time of a single UPS is more than l0, 000 hours. However, due to the change of power supply conditions, the aging of the electrical equipment of UPS itself, and the premature failure of individual components, UPS failure will be caused. Since the automatic control system is the central system of the whole production line, in order to ensure its stable and highly reliable operation, the dual-machine thermal backup, namely redundancy technology, is adopted, and its technical application is as follows:
1) the reliability is higher than that of a single machine to achieve double security.
2) in case of power failure, one UPS fails, while the other can still provide high-quality power supply.
3) maintain the normal function of UPS during maintenance.
4) the service life of the two UPS is extended.
In the case of power failure, a UPS failure, system maintenance, etc., the static switch switch has a strict circuit control, to ensure that there will not be any power failure when switching.
The structure of the hot standby machine can ensure that the load equipment will not be out of power in the mains or due to UPS failure, to ensure that the load equipment will not cause data loss, equipment damage, degraded use, system crash and other problems.
