First Midas Technology

UPS Power Distribution

We are engaged in offering various UPS Power Distribution System services to our clients. These services are ideal for the power distribution in residential & commercial buildings and are ensured for their reliability and flexibility.

Overall protection of Branch Circuits connected to critical loads can be a very complex issue. These branch circuits are typically connected to UPS Systems. There could be a very wide variety of UPS System types and critical loads. There could be a wide variety of issues involving the protection of the overall system through the branch circuit protection devices; usually these protection devices would be either circuit breakers or fuses. Within each of these two categories of protective devices, there exists another wide variety of choices. When dealing with branch circuit protection, the primary factors to consider are the time-vs-current characteristics of the protective device, the time-vs-current characteristics of the power source, and the time that the critical connected equipment can operate at zero volts.

When evaluating the UPS system involved, one must first determine what type of UPS system is being used: True On-Line, Standby, or Off-Line. Generally, Industrial customers would tend to use a True On-Line system, but not always. A true on-line system would be one in which the Inverter section of the UPS system is intended to be connected to the loads during all normal operating conditions. This is normally accomplished through the use of an Automatic Static Transfer Switch. With this configuration, the output of the Inverter is connected to the primary position of the Static Switch, and the secondary position, or Bypass position, of the Static Switch is connected to an Alternate, or Bypass Source. The Bypass Source should normally be a separate electrical feed to the system rather than being “wrapped around” from the primary feed to the UPS system normal input. Additionally, in these on-line systems, the separate Bypass source is typically delivered to the UPS through a Transformer (usually a step-down/ isolating type) that is compatible with the UPS system’s Inverter output rating. This is important when trying to determine the overall “fault clearing” capability of the system.