purchase & stores division - ISRO

TECHNICAL SPECIFICATION FOR 11 kV OUT DOOR SWITCHING UNITS -
(RING MAIN UNIT) RMU
1. SCOPE
The scope of the work includes Supply, Installation, Integration, Testing and
Commissioning of 11 KV compact substation switching units with Remote
monitoring facilities at site with all safety accessories, tools and tackles. The Outdoor
switching yard / Sub-station shall be installed and tested as per IEC 60 – 1330
and shall be confirmed for internal arc test wherever applicable. Operating methods
of Pre-fabricated Load break switch and VCBs which are cable & Bus-bar connected
to be operated from outdoor & indoor / local or remote for alternating current of
primary rated voltage 11kV and for a transformer of maximum power 2 x 1000 kVA
for services frequencies. The Pre-Fabricated LBS RMU cubicles to be situated
outdoor at ground level on a raised platform at Free State condition.
1.1 SPECIAL NOTE:
a. The required substation shall meet the power flow diagram as per enclosed
schematic Drg. No MCF/OL/HT-SLD/2007
b. The scope includes supply of 11 KV Ring Main Unit with VCBs, LBS,
including CTs & PTs, Lightning Arrestors, Control battery, control Panels
protective devices and its inter face to Industrial PCs / SCADA / remote
monitoring system
c. Both incoming, LBSs and VCBs outgoing termination should be suitable for
cable connection with Single / dual run of 3 CORE, 150 / 120 SQ.mm XLPE,
armoured 11KV power cable.
d. There should be explicit provisions of terminals for connecting earth leads.
e. An integrated remote monitoring and control unit with each switchgears should
have facility to interfaced with SCADA / SNMP or RS 485 interface and
necessary software to run under windows operating system (OS) shall be
supplied for M&C.
f. Offer may be made separately for total SCADA system and SNMP or RS 485
interface to PC with necessary software for remote monitoring / control
g. Local metering and indication / Remote Manual operation and monitoring Panel
for the functional and operational status of the switchgear.
h. The details of approvals received from Electricity boards, CPRI, Central and
local inspectorates etc also should be enclosed with the offer.
i. Party should have variable Current injection kit at site for Testing of relays &
other tripping devices. The instrument should be calibrated & certified by Govt.
Approved agency. It shall be the responsibility of the party to test and
demonstrate the safety tripping parameters during CEA & Electrical
Inspectorate. The necessary fees towards CEA & Electrical Inspectorate
inspection will be born by the Dept.
j. Manual over-ride for all Auto system to be provided.
k. Bidder may ask for technical clarification if required. The party has to
provide a point-by-point confirmation of the technical features with
catelogues, specifications and bill of materials provided in the tender. If this
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