NATIONAL ALUMINIUM COMPANY LIMITED - Rites

Necessary distribution board for distribution of power from UPS output t tto
individual
consumers.
Permissible variations for mains power supply system shall be as follows:
Voltage
: + 10 % , -15 %
Frequency
: As per IS
Harmonic distortion
: < 5%
Output of the uninterruptable power supply system while delivering a load of its rated
capacity (P.F of load shall not effect its output) shall have following variations;
Voltage regulation
:1% (For 0-100% load)
Frequency
: (+/-) 0.5% (For 0-100% load)
Efficiency
:Above 80%
100% to 0% and 0% to 100% load : Volt dip +10%
Enclosure and ventilation
Enclosure conforming to IP IP-41 41 class. Units shall be provided with cooling fans and louvers at
the bottom sides. Individual ventilation ducts for eac each h unit shall be provided.
Distribution Board
The DB shall have two buses, main and standby and shall be protected by semiconductor fuses
with fuse monitoring device, bus healthy lamps, voltmeters and ammeters. Each load shall be
fed by two independent feeders. Isolating and buscoupling switches shall be provided.
The enclosure sheet steel thickness shall be 2.0 mm. with cold rolled sheets and 2.5 mm for
hot rolled sheets and enclosure class protection shall be IP IP-54.
TECHNICAL PARTICULARS
1. Application : Uninterruptible Power supply for PLC aand
nd other essential loads
2. Capacity : 200 % of PLC load
3. Degree of protection : IP 54
4. Cable entry : Bottom
5. Input Supply Voltage : 415V+/ 415V+/- 10%, 3 phase 4 wire, 50 Hz +/- 5%
Batteries
1. Type
2. Application
3. Number of cells in each bank in series
4. Ambient temperature
5. D.C. nominal system voltage
6. Ampere hour capacity
7. Charging method proposed
8. Emergency load duration
Technical Specification:Sec-6, Electrical
: VRLA, SMF
: UPS System
3. Number of cells in each bank in series : As per requirement
: Min.temp. :5.0 deg.C Max.temp. :50 deg. C
5. D.C. nominal system voltage : Suitable to inverter system
: Bidder to furnish along with cal calculations
7. Charging method proposed : . Float and boost
8. Emergency load duration : 60 Minutes (battery back up time)
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