NATIONAL ALUMINIUM COMPANY LIMITED - Rites

Technical details of HT transformer and other switch gear will be submitted to NALCO / RITES
for its approval. The conductor for 33KV line shall be of AACSR
CSR (dog/Rabbit) type.
The HT transformer (33KV/ (33KV/0.44KV) shall ll be located in the near the wagon tippler area. The
switch gear will be designed in conformity to CEA norms having provision of LA, PT, CT, ISO etc.
Fencing and development of switch gear will be the scope of the bidder. The switch gear will
be located near wagon tippler area.
Room size to be decided by the bidder to house all required equipments (HT & LT switch
gears) at the ground floor.
WT Control room and operating panel will be located aat
t first floor of the building.
Bidders are also advised to visit the site and assess the actual quantum of work to be done for
this diversion and include accordingly.
The operation of the WT SYSTEM plant shall be monitored and controlled from the proposed
WT control rooms by means of VDU operator interface on a microprocessor based
programmable logic controller (PLC). The system shall be envisaged for the purpose of initial
operation, protection and interlock, data acquisition, close loop control, data a aarchiving,
etc for
fully automatic operation. The system shall be capable of monitoring and displaying the status
of equipment, including the analog and digital signal displaying of status in the form of
diagram, trend bar chart, overview, logs, etc with th the e help of CRT, keyboard, mouse and
printers.
Necessary hardware and software license of the proposed PLC shall be provided provided. PLC
programme, ladder logic and control philosophy shall be submitted by the bidder for approval
of NALCO/RITES.
The preferred make of PLC shall be GE GE-FANUC make.
33 kV Unit Vacuum Circuit Breaker
33 kV indoor Vacuum Circuit Breaker shall conform to the following technical particulars:
i) Type
Indoor, Vacuum type, electrically operated,
trip free type, panel mounted
ii) Quantity
iii) System Voltage 33 kV
iv) Maximum system voltage 36 kV
v) Continuous current As per requirement
vi) Rated short time current rating 31.5 kA for 3 sec
vii) Interrupting capacity at 36 kV 31.5kA
Technical Specification:Sec-6, Electrical
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