【 Weak current College 】 UPS redundancy and machine solutions

· Applications: * mission-critical applications; ■ real-time process control; ■ relate to large networks; ■ key load high speed data processing; ■ power failure will pay expensive price. · programme features: * scalability: may need at any time extend the redundancy and machine system, easy to achieve n + 1 redundant and machine operation; ■ reliability: any one UPS fails, the UPS automatically exit the running, take all the remaining UPS load automatically, guarantee system uptime; ■ availability: one UPS failure does not affect system operation, without downtime waiting for repair, improve the mean time, the maximum protection possible from loading properly. · two redundant UPS and computer programmes: for easy analysis, here only two UPS for 1 + 1 redundant and machine, as shown in Figure 1. All subsequent load of less than 100kVA UPS, two output voltage at the output distribution Cabinet in immediate and machine, and then switch to load Q. If you have dual power load can be set from the output distribution to load all the cited, at the same time meet the dual power input conditions, such as S3, S4 in the figure shown · two redundant UPS and machine reliability of electricity supply reliability analysis: in order to have a bold vision of the concept of value, where only the UPS itself and machine, those essential breaker, regardless of how electricity is essential to everyone, so not to consider, where only discusses differentiated section. If the reliability of each UPS r = 0.99, for the sake of simplicity, a provisional opinion two UPS reliability equivalent to make dual 1 + 1 redundant and machine power supply reliability model diagram, as shown in Figure 2. At this point, the reliability of power supply system: the R2 is no reliability Q = 1-reliability = 1-0.9999 = 0.0001, reliability is also 1, failure rate is approximately 1. The dual redundancy and machines, the reliability of the system increases the two orders of magnitude. The reason for this is that it allows the availability of the expressions mean time to repair to minimize the MTTR. In addition, dual redundant and machine structure of the system has one big advantage, strong overload capacity: 2 x overload capacity UPS stand-alone. · UPS redundant fundamental works and machine: the normal operating state: load A by ups and UPS b rectifier--inverter to supply power to the respective battery charging, each of the UPS by inverter with 50% of the load operation.
UPS online maintenance: when one UPS failure (such as A UPS), will automatically exit the running, the remaining one ups runs with 100% load. On the failure of UPS can disconnect its Q1, Q2, Q3, Q4 and Q5 other isolating switch for safe maintenance, repair, and then put into operation, its status as described above. Even if the UPS is not a failure, you can use this State on its in-house maintenance, for example: cleaning dust, fastening bolts, testing or replace the battery. · UPS redundancy and machine programme: power supply scheme diagram:

· Schematic diagram: