Reliability Analysis of Modular Single Machine

To evaluate the reliability of a UPS system in performing its duties, it is necessary to consider not only the MTBF of the UPS, but also the MTTR of the UPS and the MTBF of the mains. When the UPS fails and the mains fails at the same time, the load will lose power, which means that the key duties of the UPS fail. The length of time the load is exposed to the unprotected mains depends on the length of the repair time. If it takes a week to repair a UPS, and the average uninterrupted time of the mains is also a week, then when the UPS fails, the load will most likely lose power. If the MTTR of the UPS is 1 hour, then the MTBF of the mains will not have a significant impact on the failure probability of the critical load. Obviously, reducing the MTTR of the UPS will reduce the failure probability of the critical load. The best way to reduce the MTTR of the UPS is to minimize the factors that may affect the maintenance of the UPS. Modular stand-alone UPS is naturally the best choice because it has the function of online hot swapping.

From the design principle, the entire power supply system responsible for power supply must adopt a redundant power supply solution with a high degree of “fault tolerance” to ensure that no matter when the mains power grid fails or when any module (including the system control module) fails, or when performing daily maintenance/repair operations or when the fuse burns out/the circuit breaker switch “trips” for some reason, the interconnected equipment should be powered by the inverter power supply of the “online UPS” and should not be powered by the ordinary mains power supply/emergency standby generator set through the UPS AC bypass.

In summary, modular stand-alone UPS has the longest mean time between failures (λmission), the shortest mean time to repair (MTTR), the strongest ability to resist the risk of mains interference and a high degree of “fault tolerance”, and is the most reliable power guarantee.

Modular UPS Best Performance Features
With a variety of working modes

This product has a variety of models to choose from, is easy to operate, and can realize a variety of input and output line methods: 1/1, 1/3, 3/1 or 3/3, the input frequency can be 50Hz and the output frequency can be set to 60Hz, and the output voltage can be set to 220V, 230V, 240V. If the input and output transformers are configured, it can meet the power supply needs of all countries and regions in the world.

Small size, high power density

High working efficiency and high power density are its biggest features. It can provide power output of 5KVA (4000W), 10KVA (8000W), 15KVA (12KW) and 20KVA (16KW).

Environmental protection

The UPS total harmonic distortion (THDI) is 3%, and the output total harmonic distortion under linear load is less than 2%, which minimizes the harmonic interference to the power grid and effectively reduces the power grid load and power loss. With excellent input parameters, it shows pure resistance characteristics to the mains power grid, making it an ideal environmentally friendly and efficient UPS.

High efficiency and energy saving

Energy saving and consumption reduction, green energy-saving modular UPS has attracted much attention, with an input power factor of more than 0.999. It reduces line loss and improves power utilization. Its inverter efficiency can reach more than 98%, thereby improving the overall work efficiency, reducing losses and saving electricity.

Scalability, easy to install, maintain, replace and upgrade

This model is composed of various modules, which can realize hot-swappable function, and each module rack can be completely separated, which is convenient for users to expand or reduce capacity in the future. It is easy to use and can realize online replacement and online maintenance, which reduces the difficulty and time of maintenance. The size of each module is designed according to the standard 19-inch structure, so that the appearance of the whole machine is consistent with the standard rack, beautifying the appearance of the machine, and the module can be used in common with the standard rack.

Redundant, decentralized parallel logic control

The parallel control between modules adopts a distributed logic control method, without the distinction between the master and the slave. The removal or insertion of any module will not affect the normal operation of other modules. N+1 and N+X redundant systems are formed as needed, reducing the risk factor of the system itself and the load, and comprehensively improving the load protection time by UPS. It not only increases the reliability of the whole machine, but also simplifies the difficulty of user maintenance.