Principles for Equipment Configuration of Communication Power Supply DC Power Supply System
The equipment configuration and wire selection of the DC power supply system are mainly based on the short-term and long-term DC load investigation and statistics of various communication equipment in the communication bureau (station), to configure the capacity and quantity of high-frequency switch rectifiers, battery packs, AC/DC distribution panels, as well as to select the wire diameter and specifications.
The capacity of AC and DC distribution panels is configured based on long-term load, and their output load distribution can be determined according to the needs of electrical equipment.
The capacity of the high-frequency switch rectifier should simultaneously meet the sum of recent communication load and battery charging load. The number of rectifier modules should be configured in a redundant (N+1) manner.
The capacity of the battery should be able to meet the specified allowable discharge time requirements.
The wire diameter of the DC power supply busbar should be able to meet the maximum allowable voltage drop throughout the entire DC power supply circuit.
Capacity and quantity configuration of rectifier
For stations using high-frequency switch type rectifiers, the rectifier configuration should be determined in an n+1 redundant manner, with n primary and 1 backup when n ≤ 10; When n>10, reserve 1 for every 10. The total capacity of the main rectifier should be determined by the sum of the load current and the average charging current of the battery (10 hour rate charging current).
For stations using hybrid power supply systems such as solar energy, when the charging current of the battery at a 10 hour rate is much greater than the communication load current, the capacity of the main rectifier should be determined based on the sum of the load current and the charging current at a 20 hour rate.
