Power supply system:
All AC/DC power supplies required for the completeness and successful operation of C&I system shall be fed from the system LT Distribution boards to be arranged by the bidder. However, the arrangement shall be subject to consultant/owner’s approval.
15.7.1 UPS System
The UPS system shall be supplied to cater the following minimum load requirement of C&I system:
a. Un-interruptible power supply (UPS) system consisting of 2X100% static inverters, 1X100% stationary batteries, 2X100% chargers static switches, manual by-pass, step down transformers, 2X100% AC distribution board.
b. The bidder shall also provide all other required stable and reliable power supplies/packs as required for various C&I equipment /devices/system offered to ensure reliable operation of various C&I equipment/devices under all conditions
c. The capacity and rating of each of the system shall be adequate to meet their respective load requirements and spare capacity margin of at least 25%.The capacity of UPS shall have one hour back up time The bidder shall furnish exact load calculation for each of the systems and subject to purchaser/consultant approval.
d. All the power supply equipment/system shall have surge withstand capability (SWC) to meet the requirement of relevant latest ANSI standard.
e. All non-interrupting components of the electric power supply system shall be capable of withstanding all possible short circuit currents without damage. Additionally, all circuit interrupting components shall be capable of withstanding and interrupting all encountered short circuits current without damage.
f. The bidder shall decide the KVA rating of UPS based on the KVA rating of various loads to be fed from UPS. Further a spare capacity margin of not less than 25% shall be provided. The loads considered critical and required to be fed from UPS shall be decided during detailed engineering stage keeping in view the recommendation of sub-system supplier etc.
g. Complete 24V DC power supply system shall be supplied to meet the requirements of PLC based control system.
