Excitation Panel
1. SCOPE:
1. SCOPE:
Scope of supply shall include design, engineering,
manufacturing, testing, inspection, packing and transport of
equipment to site in accordance with the stipulations mentioned
hereunder and in data sheet.
2. CODES AND STANDARDS:The design, manufacturing and performance
of equipment covered by this specification shall confirm to the
relevant Indian standards and codes of practices. Where Indian
standards are not available, they shall confirm to relevant
British, IEC and American standards.
Sl. No.DescriptionStandards
01Code of practice for climate proofing of electrical
equipmentIS 3202
02Marking and arrangement of switchgear, bus-bar, main
connection and aux. WiringIS 5578 & 1353
03Direct acting electrical indicating instrumentsIS 1248
04HRC fusesIS 2206, IEC 269
05Control switches and push buttonsIS 6875
06Current transformerIS 2705/ IEC 185
07Potential transformerIS 3156/ IEC 186
08Electrical relay for power system protectionIS 3231
09AC electricity metersIS 722
10Degree of protectionIS 2147&IEC 144
11Phosphate treatment of iron & steelIS 6005
12Bus-bar conductor materialIS 5082
13Static metersIEC 1036
14Instrument transformerIEC 44
15Electrical RelaysIEC 255
16LV switchgear and control gearIS 13947
17Code of practice for earthingIS 3043
3. PROJECT INFORMATION:
The equipment covered in this specification is used for
Protection of a steam turbine driven Alternator. Location:
Tamminapatnam and Momidi villages, Nellore District, AP
Ambient Air Temp 39.6 C
Ambient Max Humidity - 84 %
Altitude 4.0 Meters above MSL, Zone III
Design Temp.for Electrical Equip. -50C
Design Humidity for ESGIN Electrical Equip. -100 %
4. DESIGN REQUIREMENT:
4.1 Constructional Features: The panel shall be designed,
fabricated and fitted with the components as specified in the data
sheet and whichever applicable hereunder, necessary for
satisfactory functioning of the Control and protection system.
Cubicle shall be of Simplex type, sheet steel enclosed, dust
moisture and vermin proof. The degree of protection shall be as
specified in the data sheet.
Cubicle shall be floor mounting, free standing, formed on a
framework of standard sections. The enclosure shall be fabricated
from cold rolled sheet steel of thickness not less than 3.0 mm for
the front, back, equipment bearing surface and 2.5 mm for the rest.
The supporting structure shall be so designed to form a rigid
structure.
The panel shall be free from dents and flaws. It shall be
sufficiently reinforced to provide level surfaces, resistance to
vibration and rigidity during transportation and installation.
The perimeter of all doors, removable cover plates shall be
having neoprene gasket all around. All doors shall be fitted with
concealed type hinges and shall have handles with locking
facility.
The cubicle shall be suitable to be installed on a base frame
supplied in one piece along with foundation bolts. Amply
dimensioned oblong holes shall be provided at the bottom of the
cubicle for their installation on base frame, in addition the
cubicle shall have an additional base channel at the bottom with
smooth surface. Anti vibration pad of 15 mm thick shall be provided
between base frame and panel through its entire width on the front
and rear side.
Lifting hooks shall be provided for each transportable section
of the cubicle. All hardware shall be zinc plated and
passivated.
A suitable removable undrilled gland plate of 3mm thickness
shall be provided for cable entry. Cable entry position shall be as
specified in the data sheet.
The dimension and finish of the panel shall be as specified in
the data sheet in order to match with other cubicles in purchasers
scope.
Cubicle shall be provided with fluorescent lamps for each
section working on Aux. AC supply as specified in data sheet. It
shall be operated automatically by door limit switch.
A single phase, 15 Amps, 5 pin socket shall be provided in the
panel interior of each cubicle with on-off switch.
Panel space heater complete with MCB and thermostat shall be
provided in the panel. The thermostat shall maintain the internal
temperature above the ambient temperature to prevent moisture
condensation.
All the protective relays shall be numerical type with serial
interface facility to communicate with DCS. The no. of numerical
relays to be provided shall consider that all generator protection
functions are to be duplicated. The controller shall establish the
serial communication between the protective relays and DCS
system.
Type of relays shall be Numerical that meet the protection
philosophy described and the various performance requirements /
characteristics required for fully protecting the Intended
equipment is to be considered.
SUPPLIER shall furnish recommended relay settings with back up
calculations for entire station.Adequate number of wipe out timers
having time delayed opening contacts shall be provided to enable
reset of Generator Trip relays (86 G), wherever required. The
setting range of above timers shall approximately be in the range
of 1-10 seconds. It shall have adequate number of contacts as
required by the scheme.
5. SPECIFIC REQUIREMENTS:Discrete relays shall be provided for
60G11, 60G12, 60G21, 60G22, 60G31, and 60G 32, 61B and shall not be
part of composite numerical relays.
Two Nos. of DC supply sources shall be arranged by the purchaser
for the GRP from two different sections of DCDB. These supplies
shall be taken through a contactor changeover arrangement i.e, In
case of failure of any one source contactor shall be changed over
to the other source and complete DC supply requirement of GRP shall
be fed from the other source. Third DC supply for dead machine
protection shall be provided from station DCDB. In addition, dead
machine protection scheme shall be electrically and physically
separated from other protections.
DC auxiliary supply shall be supervised by supply supervising
relays. The NC contact of the relays shall be delayed on drop off
by approximately 100 to 200 msec. For annunciation GCP/DCS. The
relay shall be provided with flag indicator wherever required.
White colour supervision lamps of clustered LED type shall be
provided for DC supply monitoring on GRP.
The relay panels shall be provided with supervisory system
facilities to indicate the location of the failed component when
pre-engineered protection system is offered. On-line testing
facility In-Built in the relay panel shall be provided.
Either hand reset mechanically operated operation indicator or
LED with reset push button shall be provided for protective relays.
They shall be arranged to operate only when tripping current passes
through output circuit of the relay.
In addition to the contact required as per schemes, Supplier
shall wire out to the terminal block spare contacts of the
necessary relays.
The protection scheme shall include all the necessary contacts
to achieve the schemes required, alarms / Trip conditions /
Abnormal conditions of individual relays in DCS/GCP, annunciation
windows, Sequence event recorder and for switchyard control panel
(SCP) annunciation wherever required.
The protection philosophy of all equipment shall be divided into
two groups. Complete protection of the respective equipment shall
be fully available even if either of the groups is not available.
Hence, both groups of protections shall be mechanically, physically
and electrically separated into two separate and independent
systems. Each group shall be receiving all ac and dc signals from
dedicated set of devices. Similarly these two groups shall be
provided with DC supply from two separate feeders. However the
relays in both the groups shall be tripping the respective circuit
breaker through both trip coils I&II. Suitable programming,
testing & calibration facilities with necessary software,
program unit/laptop etc., shall also be provided. Automatic
changeover of DC supply source from one source to other shall be
provided.6. EQUIPMENT MOUNTING AND LOCATION:The cubicle shall be of
simplex type and shall consist of vertical front panels with
mounted equipment and rear wiring access. All equipment shall be
flush or semi-flush type.
Checking and removal of components shall be possible without
disturbing the adjacent equipment. The mounting of terminal blocks
and other auxiliary equipment such as transducers, interposing CTs,
PTs, etc. shall be done in such a way so that it is readily
accessible but without impending the access to internal wiring and
components.
The centerline of switches, push buttons and indicating lamps
shall be not less than 750 mm from the bottom of the cubicle. The
centerline of the relays and meters shall not be less than 450 mm
from the bottom of the cubicle. All switches, push buttons,
indicating lamps, meters, relays etc. shall be arranged neatly to
give a good aesthetic look.
Relay & Control Panels shall be supplied with anti vibration
pads. A clearance of 300 mm shall be maintained between terminal
blocks and gland plate and 150 mm between two rows of terminal
blocks.
7. PANEL WIRING:All wiring shall be done with PVC insulated 650
/ 1100 volt grade, single core multi strand annealed copper
conductor. For CT & PT, control and alarm circuit 2.5-sq.mm
size cables with color identification. Panel wiring shall be
securely supported, neatly installed by lacing in the wiring
channels. Flame retardant plastic channels / troughs with strap on
wiring cover shall be used.
Each wire shall be identified at both ends with wire numbers by
means of PVC \ferrules.
Ferrules shall fit tightly on the wire and shall not fall off
when the wire is disconnected.
Wire termination shall be made with solderless crimping type
tinned copper lugs, which
Firmly grip the conductor and insulation. Insulation sleeves
shall be provided at all the wire termination. More than one cable
should not be crimped on a same lug. All spare contacts of breaker
switches, push buttons, and relays shall be wired to the terminal
block.
8. TERMINAL BLOCK:Terminal block for control cable shall be of
stud type CAT M4, 650/1100 V grade rated for 10 amps complete with
insulated barriers, washers, nuts, and identification strips.The
terminal block board shall be set at 45 Deg to the side panels for
easy access. Minimum 20% spare terminal blocks shall be provided on
the cubicle. These spare terminals shall be uniformly distributed
on all rows of terminal block.
The terminal shall be suitable to receive crimped wires to give
positive connection. All terminals shall be properly shrouded
against accidental contact. Sufficient terminals shall be provided
so that not more than one wire is connected in each terminal.
Moulding material of the terminal shall be self-extinguishing
type or resistive to flame propagation, substantially
non-hydroscopic and shall not carbonize when tested for tracking.
The terminal and framework shall withstand 2 kV RMS for one
minute.
Terminal blocks for CT and PT secondary shall be provided with
test links and isolation facility. Also CT secondary leads shall be
provided with shorting and earthing links.
There shall be minimum clearance of 250 mm between the first row
of terminal block and associated cable gland plate. The clearance
between two rows of terminal block shall be minimum 150 mm.9.
LABELS:All equipment mounted on front of the panel as well as
equipment inside the panel shall be provided with individual labels
with equipment designation engraved. The label shall be mounted so
that they are clearly visible.
The name plates bearing respective circuit designation of 50mm
width etched in 40mm high letters shall be mounted on the top front
and back side of each cubicle shall be supplied and fixed in such a
way that these can be removed and refitted when desired.
Danger plates, warning plates, and other statutory notes will be
provided as per the relevant standards.
Reverse engraved name plate at least 10mm wide bearing suitable
identification shall be fixed in the interior of the switchboard,
at the test blocks/MCB blocks and at the cable terminals. Similar
plates shall be fixed on the panel for control switches, Push
buttons, lamps, mimic indicating the functions associated. Labels
shall be made of non-rusting metal or 3 ply lamicoid. Labels shall
have white letters on black background. Labels shall be fastened
using screws. Use of adhesive is not permitted.
10. EARTHING:The panel shall be fitted with the continuous earth
bus of size as specified in the data sheet which shall be securely
fixed along the inside base of the panel and running along the full
length of the cubicle.
Suitable earthing studs shall be provided at the rear bottom of
the panel at two ends for connection to the plant earth grid.
All metallic cases of panel-mounted equipment shall be connected
to the earth bus by independent insulated copper wire colored
green.
PT and CT secondary neutral or common lead shall be earthed at
one place only at the terminal block where they enter the
panel.
Insulation between the live terminals and earth prior to
connection of earth to the plant earth grid shall withstand a test
voltage of 500 volts for one minute or have resistance of not less
than one mega ohm at 500 V.
11. PAINTING:All metal surfaces shall be chemically cleaned,
degreased and pickled in acid to produce a smooth clean surface,
free of scale, grease and rust. The panel shall be powder coated to
shade as specified in the data sheet. The minimum thickness of
paint finish shall not be less than 60 - 80 microns.
Panel finish shall be free from imperfections like pin holes,
orange peels, run off paint etc. A small quantity of finishing
paint shall be included in the supply for minor paint touchup at
site after installation.
All unpainted steel parts shall be cadmium plated or suitably
treated to prevent rust corrosion. If these parts are moving
element then these shall be greased.
12. INSPECTION AND TESTING:We/our clients representative will
visit works during manufacturing to assess the progress of work/
final inspection as to ascertain the quality as per approved
quality approval plan.
All equipment and accessories shall be tested at works prior to
dispatch and certified test report shall be submitted. Testing
shall be done in accordance with the relevant standards.
Any defects noticed during inspection shall be rectified
subsequently and a compliance report shall be submitted before
dispatch.
Following minimum tests shall be carried out on the completed
panel in the presence of the purchaser/ his representative.
Checking of correctness of wiring of circuits and
continuity.
Electrical control, interlock and sequential operation test.
Functional tests
High voltage tests 2000 V to earth for one minute.
Insulation resistance will be before & after HV test and
complete wiring with all equipment mounted on the cubicles.
Routine tests according to the standards followed by the
manufacturer on the instruments, relays and other devices.
Physical & dimensional checks.
DC tests.
Test Certificates of all brought out items/components shall be
submitted for verification.
13. DRAWING AND DOCUMENTATION SCHEDULE:The supplier shall
furnish all the data/ drawings/ documents specified in the list for
review/ approval.
The general arrangement drawings drawn to scale showing front,
rear, side views with component mounting details, interconnection
and wiring diagram as well as other drawings, which may be deemed
necessary by the purchaser shall be submitted. Approval of GA
drawing is required before fabrication of the panel. Approval of
wiring and interconnection drawings is required before the panel
wiring.
Bill of material shall correlate components to GA and schematic
drawings. Components may be identified by the manufacturers
catalogue number.
The diagram shall show clearly any connections to be made in
field (because of shipping section). The vendor shall show all
external cabling information contained in purchasers control wiring
diagrams.
Number of copies of various documents required is listed
below.
Sl NoDESCRIPTIONAfter Order
Till Final ApprovalFinal
1General Arrangement drawing with sectional views of panel,
foundation details, Terminal arrangement details1212
2Schematic / wiring diagram 1212
3Rotor Earth fault capacitor Mounting box GA &
wiring1212
4Relay setting recommendations1212
5Illustrative & descriptive literature of major components
mounted in panel1212
6Quality assurance plan12-
7Test certificates of major bought out items1212
8Guarantee certificate1212
9Soft copies of final drawings in (.dwg format) in compact
disc-4 Sets
1. GENERAL DATA:Quantity: TWO Set. (PER UNIT -1 No.) Each set
consisting of 2 panels for Main-1, Main-2 protection groups
separately. Exterior Paint shade Light admiralty grey shade no.
697, powder coated, Texture Finish Only.
Interior Paint shade Brilliant White
Degree of protection - IP 52.
Earth Bus size shall be 50 x 6 mm2 Tinned copper. (Separate
Earth bus for Inst.)
Panel shall be suitable for Bottom Cable Entry
Tentative panel dimensions: (W x D x H) (Above height includes
the base channel of 85mm plus 15mm thick anti vibration pad)
2. SYSTEM DETAILS:Generator voltage15.75 kV ( 10 %
Rated current8000 Amps
Rated frequency50 ( 5%
No of phaseThree
Fault level80 kA for 3 Sec.
Generator Neutral earthingNGTR
Auxiliary AC supply240 Volts, 50 Hz ( 10%
Auxiliary DC supply220 Volts, unearthed ( 10%
UPS240V AC, 50Hz ( 10%
CT Ratio8000 / 5 Amps
PT Ratio15750/3 / 110/3 Volts
Insulation Ratio17.5/38/95kV
Bus bar MaterialAluminum
Generator Protection & Metering SLD: 2001-01-01-01, REV-04,
DATED 17.07.10
Generator Trip Logic: 2001-01-01-02, REV-02, DATED 12.07.10Note:
For Detailed BOM, Please refer attached BOM.
Separate panel shall be provided for Group -1 & Group-2
PROJECT: 2 X 150 MW THERMAL POWER PLANT. (PHASE -II)
OWNER:M/s. SIMHAPURI ENERGY PRIVATE L.IMITED-HYD.
OWNERS ENGINEER: M/s. DEVELOPMENT CONSULTANTS PVT. LTD.
KOLKATA.
EPC CONTRACTOR: M/s. MADHUCON PROJECTS LIMITED-HYDERBAD.
ORGINATOR ENGINEER: M/s. M.N.DASTUR & COMPANY (P)
LTD-KOLKATA.
