An AC power supply system consists of power mains, uninterruptible power supplies (UPSs), and self-supplied electric generators, and should use a centralized power supply mode. In addition to meeting the requirements of the server load, the AC power supply must have a simple connection line, safe operation, flexible scheduling, and easy maintenance.
The low-voltage power supply should be 3-phase, 5-wire mode or monophase 3-wire mode. This AC power supply should be 110 V/220 V, with a frequency of 50 Hz.
The UPS should supply the same power and operate at the same phase as the power mains. The switching time between the UPS and mains should be less than 10 ms; otherwise, the networking devices will reboot or reset.
For power distribution capacity in the equipment room, both the working current and fault current of the devices should be considered. Ensure that independent AC power supplies protect independent devices. Configure the current-carrying capacity of the protection switch of the equipment room for more than that of the devices.
Table 1 lists the voltage range of the AC power supply for the devices.
Item |
Requirements |
|---|---|
AC power capacity to support the devices |
-10% to +5% of the rated voltage |
AC power capacity to support the power modules and important buildings |
-15% to +10% of the rated voltage |
Frequency of alternating current |
-4% to +4% of the rated value |
Voltage wave shape sine distortion |
Within 5% of the rated voltage |
The automated electric generator must have a standard interface that supports telecommunication protocols, remote telecommunication, monitoring, and control.
AC power cables should meet the following specifications: